Updated on 2025/04/05

写真a

 
IMAIZUMI, Kazuhiko
 
Affiliation
Faculty of Human Sciences
Job title
Professor Emeritus
Degree
Doctor of Philosophy (Ph.D., Medical Sciences) ( Osaka University, Graduate Schoool of Medical Sciences, majored in Molecular Physiology of Physiological Sciences )
Master of Physical Education (MS, Exercise Physiology) ( Tokyo University of Education, Graduate Schoool of Physical Education, Master course, majored in Exercise Physiology )
Profile
Ⅰ. ご挨拶
学生時代、私は分子・細胞レベルからみた運動生理学に興味を持ち、この分野の研究者を目指しました。大学院進学後は主にヘムタンパク質による酸素輸送系の生理機能とその調節機構を検討しました。修士課程では骨格筋内のミオグロビンの動態をしらべ、博士課程ではヘモグロビンによる酸素輸送の調節機構を明確にするため、ヒトヘモグロビンの酸素平衡曲線を精密に測定し、得られたデータを Adair の四段階酸素化理論 (1925) に基づいて解析しました。これらの結果から、ヘモグロビンにおける各酸素化段階の分子種と各種陰イオン性リガンドとの相互作用について考察しました。その後の6年間は大阪大学医学部第一生理学教室(中馬一郎教授)および愛媛大学医学部第二生理学教室(志賀 健教授)においてヘム側鎖を化学修飾した再構成ヘモグロビンやミオグロビンの酸素平衡機能の変化、亜硝酸イオンによるオキシヘモグロビンの酸化機構およびヒト赤血球の集合形成とその機構をしらべました。
1983年4月には新設の新構想大学院大学として発足した上越教育大学に移り、独自に研究・教育を展開致しました。1996年6月からは同じく新構想大学院大学としてスタートした兵庫教育大学を併任し、骨格筋の可塑性の制御機構およびエタノール代謝の変動機構に関する研究を2001年4月迄の約18年間実施致しました。
2001年5月には早稲田大学人間科学学術院に移りましたが、現在まで骨格筋の可塑性の制御機構および香辛料の辛味成分・ドーピング薬などの投与あるいは亜鉛・葉酸の欠乏による生体内防御系機能の調節機構に関する研究を実施しております。その間、通常の研究・教育活動に戻る迄にはいずれも数年間を要しましたが、学内外の先生方より多くのご支援・ご協力をいただきながら、研究・教育活動を展開して参りました。
これ迄に多くの先生方や皆様方には枚挙に遑がないほどのご高配・ご指導・ご協力・ご支援などを賜り、まことに有難うございました。厚く御礼を申し上げます。早稲田大学における私自身の研究・教育活動 (2017年3月迄)も残り少なくなりましたが、今後ともご指導・ご鞭撻をいただきたく、略儀乍らご挨拶とお願いを申し上げます。

II. 研究分野
①健康・生命医科学
②基礎医学 / 生理学一般
③基礎医学 / 環境生理学(含体力医学・栄養生理学)

III. 主な研究課題
①骨格筋の可塑性とその調節機構
②β2‐作動薬投与によるエルゴジェニック効果とその発現機構
③香辛料辛味成分・茶カテキン摂取・亜鉛欠乏による生体内防御機能の応答とその役割

IV. Key words
①β2‐作動薬によるエルゴジェニック効果
②亜鉛・葉酸の欠乏と生体防御系機能との関連
③骨格筋の可塑性と β2‐アドレナリン受容体遺伝子発現との関連
④香辛料の辛味成分・茶カテキン摂取と生体防御・免疫機能・マクロファージ機能との関連

V. 主要学会活動・大型研究プロジェクト活動・社会的活動等
◆主要学会活動
①日本運動生理学会 【理事・英文機関誌(Advances in Exercise and Sports Physiology) Editorial Board Member:1997-2000年度】
②International Sports Science Network forum in Nagano 【Vice-Chairman:1998-2001年度】
③日本生理学会 【常任幹事:2004‐2007年度, 英文機関誌(The Journal of Physiological Sciences) Editorial Board Member:2002-2005年度】
④日本体力医学会 【理事・評議員選考委員会委員長:2005‐2010年度、英文機関誌(The Journal of Physical Fitness and Sports Medicine:JPFSM) The first Editor-in-Chief:2009‐2015年度】

◆主要大型研究プロジェクト活動
①文部科学省・早稲田大学先端科学・健康医療融合研究機構スーパーCOE 【コアメンバー:2004-2008年度】
②文部科学省・早稲田大学人間科学学術院 学術フロンティア研究プロジェクト 【研究代表者:2005-2009年度】
③文部科学省・早稲田大学スポーツ科学学術院グローバルCOE 【研究メンバー:2009‐2013年度】

◆主要社会的活動
①科学技術庁諮問委員会【宇宙生物医学分野専門委員 :1998年4月‐1999年3月】
②東京都立大学大学院理学研究科外部点検評価委員会委員 【2001年7月‐2002年3月】
③【独】国立病院機構 西埼玉中央病院 受託研究・治験審査委員会 外部委員 【2008年4月‐現在迄】

◆受 賞
①日本運動生理学会第2回学会賞受賞 (2001年7月)

VI. 学歴・職歴
1969年3月 早稲田大学教育学部教育学科体育学専修卒業
1972年3月 東京教育大学大学院体育学研究科修士課程運動生理学専攻修了
1977年3月 大阪大学大学院医学研究科博士課程生理系分子生理学専攻修了
1977年4月 大阪大学医学部博士研究生(生理学第一講座、中馬一郎 教授)
1981年5月 愛媛大学助手 (医学部生理学第二講座、志賀 健 教授)
1982年4月 愛媛大学助手併任 (大学院医学研究科博士課程、志賀 健 教授)

1983年4月 上越教育大学助教授 (学校教育学部 生活・健康系教育講座)
1983年4月 上越教育大学助教授併任 (大学院学校教育研究科修士課程)
1996年6月 兵庫教育大学助教授併任 (大学院連合学校教育学研究科博士課程)
1998年1月 上越教育大学教授 (学校教育学部 生活・健康系教育講座)
1998年1月 上越教育大学教授併任 (大学院学校教育研究科修士課程)
1998年1月 兵庫教育大学教授併任 (大学院連合学校教育学研究科博士課程)

2001年5月 早稲田大学教授 (人間科学部人間健康科学科)
2001年5月 早稲田大学教授併任 (大学院人間科学研究科博士後期課程)
2003年4月 早稲田大学教授 (人間科学部健康福祉科学科)
2004年9月 早稲田大学教授 (人間科学学術院) 【現在迄】
2004年9月 早稲田大学人間科学学術院 人間総合研究センター副所長 【2006年9月迄】
2006年9月 早稲田大学人間科学学術院 副学術院長・人間総合研究センター所長 【2008年9月迄】
2009年4月 早稲田大学教授併任 (スポーツ科学学術院) 【2014年3月迄】

VII. 指導論文(上越教育大学・兵庫教育大学・早稲田大学:1983年4月~現在迄)
①卒業論文=87(73)編、②修士論文=33(21)編、 ③博士論文=6(5)編
【括弧内の値:早稲田大学在任中の指導論文数】


VIII. 研究業績
◆主要学術論文
1). Shiga T and Imaizumi K. (1973) Generation of phenoxy radicals by methemoglobin-hydrogen peroxide studied by electron paramagnetic resonance. Archives of Biochemistry and Biophysics (New York, Academic Press/Elsevier), 154 : 540-547.

2). Shiga T and Imaizumi K. (1975) Electron spin resonance study on peroxidase- and oxidase-reactions of horse radish peroxidase and methemoglobin. Archives of Biochemistry and Biophysics (New York, Academic Press/Elsevier), 167 : 469-479.

3). Imaizumi K, Imai K and Tyuma I. (1978) On the validity of the spectrophotometric determination of oxygen saturation of hemoglobin:The wavelength dependence of observed oxygen equilibrium parameter values. Journal of Biochemistry (Tokyo), 83 : 1707-1713.

4). Imaizumi K, Imai K and Tyuma I. (1979) The linkage between the four-step binding of oxygen and the binding of heterotropic anionic ligands in hemoglobin. Journal of Biochemistry (Tokyo), 86 : 1829-1840.

5). Kosaka H, Imaizumi K, Imai K and Tyuma I. (1979) Stoichiometry of the reaction of oxyhemoglobin with nitrite. Biochimica et Biophysica Acta (Amsterdam, Elsevier), 581 : 184-188.

6). Imaizumi K, Tyuma I, Imai K, Kosaka H and Ueda Y. (1980) In vivo studies on methemoglobin formation by sodium nitrite. International Archives of Occupational Environmental Health (Berlin and Heidelberg, Springer-Verlag), 45 : 97-104. 【DOI:10.1007/BF01274129】

7). Tyuma I, Ueda Y, Imaizumi K and Imai K. (1981) Prediction of the carbonmonoxyhemoglobin levels during and after carbon monoxide exposures in various animal species. Japanese Journal of Physiology (Tokyo), 31 : 131-143.

8). Kosaka H, Imaizumi K and Tyuma I. (1981) Mechanism of autocatalytic oxidation of oxyhemoglobin by nitrite, an intermediate detected by electron spin resonance. Biochimica et Biophysica Acta (Amsterdam, Elsevier), 702 : 237-241.

9). Imaizumi K, Imai K and Tyuma I. (1982) Linkage between carbon dioxide binding and four-step oxygen binding to hemoglobin. Journal of Molecular Biology (London, Academic Press/Elsevier), 159 : 703-719.

10). Kawabe K, Imaizumi K, Imai K, Tyuma I, Ogoshi H, Iwahara T and Yoshida Z-I. (1982) Studies on reconstituted myoglobins and hemoglobins. I. Role of the heme side chains in the oxygenation of myoglobin. Journal of Biochemistry (Tokyo), 92 : 1703-1712.

11). Kawabe K, Imaizumi K, Yoshida Z-I, Imai K and Tyuma I. (1982) Studies on reconstituted myoglobins and hemoglobins. II. Role of the heme side chains in the oxygenation of hemoglobin. Journal of Biochemistry (Tokyo), 92 : 1713-1722.

12). Kosaka H, Tyuma I and Imaizumi K. (1983) Mechanism of autocatalytic oxidation of oxyhemoglobin by nitrite. Biomedica et Biochimica Acta (Formerly titled "Acta Biologica et Medica Germanica") (Berlin), 42 : S144-S148.

13). Imaizumi K and Shiga T. (1983) Effects of immunoglobulins and IgG-fragments on human erythrocyte aggregation, studied by a rheoscope with TV image analyzer. Biorheology (Pergamon, USA), 20 : 569-577.

14). Shiga T, Imaizumi K, Harada N and Sekiya M. (1983) Kinetics of rouleaux formation using TV image analyzer.I. Human erythrocytes. American Journal of Physiology:Heart and Circulatory Physiology (Washington DC), 245 : H252-H258.

15). Shiga T, Imaizumi K, Maeda N and Kon K. (1983) Kinetics of rouleaux formation using TV image analyzer. II. Rat rythrocytes. American Journal of Physiology:Heart and Circulatory Physiology (Washington DC), 245 : H259-H264.

16). Maeda N, Kon K, Imaizumi K, Sekiya M and Shiga T. (1983) Alteration of rheological properties of human erythrocytes by crosslinking of membrane proteins. Biochimica et Biophysica Acta (Amsterdam, Elsevier), 735 : 104-112.

17). Imaizumi K, Imai A, Maruyama T and Shiga T. (1984) Inhibition of IgG-, F(ab)’2- and myeloma protein-induced erythrocyte aggregation, by small IgG-fragments. Clinical Hemorheology (Pergamon, USA), 4 : 431-439.

18). Maeda N, Imaizumi K, Sekiya M and Shiga T. (1984) Rheological characteristics of desialylated erythrocytes in relation to fibrinogen-induced aggregation. Biochimica et Biophysica Acta (Amsterdam, Elsevier), 776 : 151-158.

19). Sato M, Imaizumi K, Bessho T and Shiga T. (1984) Increased erythrocyte aggregation in diabetes mellitus and its relationship to glycosylated haemoglobin and retinopathy. Diabetologia (Springer-Verlag, Germany), 27 : 517-521. 【DOI:10.1007/BF00290387】

20). Maeda N, Imaizumi K, Kon K and Shiga T. (1987) A kinetic study on functional impairment of nitic oxide exposed rat erythrocytes. Environmental Health Perspectives (Bethesda, NIH:National Institute of Environmental Health Sciences), 73 : 171-177.

21). Tachiyashiki K and Imaizumi K. (1992) Lowering and delaying actions of bovine bile on plasma ethanol levels in rats. Journal of Nutritional Science and Vitaminology (Tokyo), 38 : 69-82. 【DOI:10.3177/jnsv.38.69】

22). Tachiyashiki K and Imaizumi K. (1993) Effects of vegetable oils and C18-unsaturated fatty acids on plasma ethanol levels and gastric empyuing in ethanol-administered rats. Journal of Nutritional Science and Vitaminology (Tokyo), 39 : 163-176. 【DOI:10.3177/jnsv.39.16】

23). Imaizumi K and Tachiyashiki K. (1994) Analysis of the growth of rat hindlimb skeletal muscles on the basis of DNA, RNA and protein levels. Advances in Exercise and Sports Physiology (Tsukuba),1:25-32.

24). Imaizumi K and Tachiyashiki K. (1994) Biochemical and histological properties of muscle atrophy in C57BL/6J dy mice. Advances in Exercise and Sports Physiology (Tsukuba), 1 : 33-40.

25). Imaizumi K and Tachiyashiki K. (1994) Effects of feeding levels and body weight loading on muscle mass and visceral organ size in rats. Advances in Exercise and Sports Physiology (Tsukuba), 1 : 41-50

26). Imaizumi K, Tachiyashiki K and Jikihara K. (1996) Responses of visceral organ size and skeletal muscle mass during whole body suspension and recovery in rats. Advances in Exercise and Sports Physiology (Tsukuba), 2 : 19-29.

27). Harada S, Tachiyashiki K and Imaizumi K. (1998) Effect of sex hormones on rat liver cytosolic alcohol dehydrogenase activity. Journal of Nutritional Science and Vitaminology (Tokyo), 44 : 625-639. 【DOI:10.3177/jnsv.44.625】

28). Harada S, Tachiyashiki K and Imaizumi K. (2000) Sex-dependent developmental change of rat liver cytosolic alcohol dehydrogenase activity. Journal of Nutritional Science and Vitaminology (Tokyo),46 : 49-52. 【DOI:10.3177/jnsv.46.49】

29). Kato S, Shirato K, Imaizumi K, Toyota H, Mizuguchi J, Odawara M, Che X-F, Akiyama S, Abe A and Tomoda A. (2006) Anticancer effects of phenoxazine derivatives combined with tumor necrosis factor-related apoptosis-inducing ligand on pancreatic cancer cell lines, KLM-1 and MIA-PaCa-2. Oncology Reports (Spandidos Pub, Greece), 15 : 843-848.

30). Shirato K, Motohashi N, Tanihata J, Tachiyashiki K, Tomoda A and Imaizumi K. (2006) Effects of two types of inactivity on the number of white blood cells in rats. European Journal of Applied Physiology (Springer-Verlag), 98 : 590-600. 【DOI:10.1007/s00421-006-0306-6】

31). Shirato K, Imaizumi K, Abe A and Tomoda A. (2007) Phenoxazine derivatives induce caspase-independent cell death in human glioblastoma cell lines, A-172 and U-251 MG. Oncology Reports (Spandidos Pub, Greece), 17 : 201-208.

32). Shirato K, Tanihata J, Motohashi N, Tachiyashiki K, Tomoda A and Imaizumi K. (2007) b2-agonist clenbuterol induced changes in the distribution of white blood cells in rats. Journal of Pharmacological Sciences (Tokyo, Elsevier), 104 : 146-152.【DOI:10.1254/jphs.FP0070267】

33). Shirato K, Imaizumi K, Abe A and Tomoda A. (2007) Phenoxazine derivatives 2-amino-4, 4a-dihydro-4a-phenoxazine-3-one and 2-aminophenoxazine-3-one-induced apoptosis through a caspase-independent metabolism in human neuroblastoma cell line NB-1 cells. Biological & Pharmaceutical Bulletin (Tokyo), 30:331-336. 【DOI:10.1248/bpb.30.331】

34). Kasuga T, Tabuchi T, Shirato K, Imaizumi K and Tomoda A. (2007) Caspase-independent cell death revealed in human gastric cancer cell lines, MKL45 and KATO III treated with phenoxazine derivatives. Oncology Reports (Spandidos Pub, Greece), 17 : 409-415.

35). Terada M, Lyubaeva E, Ohira T, Netreba A, Kawano F, Okabe H, Aoyama T, Imaizumi K, Vinogradova O and Ohira Y. (2007) Responses of vastus lateralis muscle fibers to cycling training with different loading parameters in human. Japanese Journal of Aerrospace and Environmental Medicine (Tokyo), 44 : 59-64.

36). Shirato K, Imaizumi K, Miyazawa K, Takasaki A, Mizuguchi J, Che X-F, Akiyama S and Tomoda A. (2008) Apoptosis induction proceeded by mitochondrial depolarization in multiple myeloma cell line U266 by 2-aminophenoxazine-3-one. Biological & Pharmaceutical Bulletin (Tokyo), 31 : 62-67. 【DOI:10.1248/bpb.31.62】

37). Tanihata J, Suzuki N, Miyagoe-Suzuki Y, Imaizumi K and Takeda S. (2008) Downstream utrophin enhancer is required for expression of utrophin in skeletal muscle. Journal of Gene Medecine (John Wiley & Sons), 10 : 702-713. 【DOI:10.1002/jgm.1190】

38). Ohno H, Sakurai T, Hisajima T, Abe S, Kizaki T, Ogasawara J, Ishibashi Y, Imaizumi K, Takemasa T, Haga S, Kitadate K, Nishioka H and Fujii H. (2008) The supplementation of oligonol, the lychee fruitderived polyphenol converting into a low-molecular form, has a positive effect on fatigue during regular track- and field-training in young athletes. Advances in Exercise and Sports Physiology (Tsukuba), 13 : 93-99.

39). Kizaki T, Takemasa T, Sakurai T, Izawa T, Hanawa T, Kamiya S, Haga S, Imaizumi K and Ohno H. (2008) Adaptation of macrophage to exercise training improves innate immunity. Biochemical and Biophysical Research Communications (Elsevier), 372 : 152-156. 【DOI:10.1016/j.bbrc.2008.05.005】

40). Motohashi N, Uezumi A, Yada E, Fukuda S, Fukushima K, Imaizumi K, Miyagoe-Suzuki Y and Takeda S. (2008) Muscle CD31(-) CD45(-) side population cells promote muscle regeneration by stimulating proliferation and migration of myoblasts. American Journal of Pathology (American Society of Investigative Pathology, Elsevier), 173 : 781-791. 【DOI:10.2353/ajpath.2008.070902】

41). Sato S, Nomura S, Kawano F, Tanihata J, Tachiyashiki K and Imaizumi K. (2008) Effects of the b2-agonist clenbuterol on b1- and b2-adrenoceptor mRNA expressions of rat skeletal and left ventricle muscles. Journal of Pharmacological Sciences (Tokyo, Elsevier), 107 : 393-400. 【DOI:10.1254/jphs.08097FP】

42). Nomura S, Ichinose T, Jinde M, Kawashima Y, Tachiyashiki K and Imaizumi K. (2008) Tea cathechins enhance the mRNA expression of uncoupling protein 1 in rat brown adipose tissue. Jounal of Nutritional Biochemistry (Elsevier), 19 : 840-847. 【DOI:10.1016/j.jnutbio.2007.11.005】

43). Kizaki T, Shirato K, Sakurai T, Ogasawara J, Oh-ishi S, Matsuoka T, Izawa T, Imaizumi K, Haga S and Ohno H. (2009) β2-adrenergic receptor regulate Toll-like receptor 4-induced late-phase NF-kB activation. Molecular Immunology (Elsevier), 46 : 1195-1203. 【DOI:10.1016/j.molimm.2008.11.005】

44). Sakurai T, Izawa T, Kizaki T, Ogasawara J, Shirato K, Imaizumi K, Takahashi K, Ishida K and Ohno H. (2009) Exercise training decreases expression of inflammation-related adipokines through reduction of oxidetive stress in rat white adipose tissue. Biochemical and Biophysical Research Communications (Elsevier), 379 : 606-609. 【DOI:10.1016/j.bbrc.2008.12.127】

45). Ohno H, Haga S, Takemasa T, Sakurai T, Ogasawara J, Shirato K, Ishibashi Y, Imaizumi K and KizakiT. (2009) Swimming training prevents induction of suppressor macrophages in mice during acute exposure to cold. Advances in Exercise and Sports Physiology (Tsukuba), 15 : 1-7.

46). Kato Y, Sawada A, Numao S, Miyauchi R, Imaizumi K, Sakamoto S and Suzuki M. (2009) Effect of light exercise after ingestion of a high-protein snack on plasma branched-chain amino acid concentrations in young adult females. Journal of Nutritional Science and Vitaminology (Tokyo), 55 : 106-111. 【DOI:10.3177/jnsv.55.106】

47). Someya Y, Tanihata J, Sato S, Kawano F, Shirato K, Sugiyama M, Nomura S, Tachiyashiki K and Imaizumi K. (2009) Zinc-deficiency induced changes in the distribution of rat white blood cells. Journal of Nutritional Science and Vitaminology (Tokyo), 55 : 162-169. 【DOI:10.3177/jnsv.55.162】

48). Akimoto S, Tanihata J, Kawano F, Sato S, Takei Y, Shirato K, Someya Y, Nomura S, Tachiyashiki K and Imaizumi K. (2009) Acute effects of dihydrocapsaicin and capsaicin on the distribution of white blood cells in rats. Journal of Nutritional Science and Vitaminology (Tokyo), 55 : 282-287. 【DOI:10.3177/jnsv.55.282】

49). Ideno H, Takanabe R, Shimada A, Imaizumi K, Araki R, Abe M and Nifuji A. (2009) Protein related to DAN and cerberus (PRDC) inhibits osteoblastic differentiation and its suppression promotes osteogenesis in vitro. Experimental Cell Research (Elsevier), 315 : 474-484. 【DOI:10.1016/j.yexcr.2008.11.019】

50). Kawano F, Tanihata J, Sato S, Nomura S, Shiraishi A, Tachiyashiki K and Imaizumi K. (2009) Effects of dexamethasone on the expression of β1-, β2- and β3-adrenoceptor mRNAs in skeletal and left ventricle muscles in rats. Journal of Physiological Sciences (Tokyo, Springer), 59 : 383-390.【DOI:10.1007/s12576-009-0046-6】

51). Shirato K, Kizaki T, Sakurai T, Ogasawara J, Ishibashi Y, Iijima T, Okada C, Noguchi I, Imaizumi K, Taniguchi N and Ohno H. (2009) Hypoxia-inducible factor-1a suppresses the expression of macrophage
scavenger receptor 1. Pflugers Archives:European Journal of Physiology (Springer), 459 : 93-103.【DOI:10.1007/s00424-009-0702-y】

52). Sato S, Nomura S, Kawano F, Tanihata J, Tachiyashiki K and Imaizumi K.(2010) Adaptive effects of the β2-agonist clenbuterol on expression of b-adrenoceptor mRNA in rat fast-twitch fiber-rich muscles. Journal of Physiological Sciences (Tokyo, Springer), 60 : 119-127.【DOI:10.1007/s12576-009-0075-1】

53). Terada M, Lan Y-B, Kawano F, Ohira T, Higo Y, Nakai N, Imaizumi K, Ogura A, Nishimoto N, Adachi Y and Ohira Y. (2010) Myonucleus-related properties in soleus muscle fibers of mdx mice. Cells Tissues Organs (Karger), 191 : 248-259. 【DOI:10.1159/000240245】

54). Aritoshi S, Sato S, Kumazawa M, Ban T, Tanihata J, Tachiyashiki K and Imaizumi K. (2010) Subacute effects of capsaicinoids on the distribution of white blood cells in rats. Jounal of Health Science (Tokyo), 56 : 99-103. 【DOI:10.1248/jhs.56.99】

55). Ohkaru Y, Arai N, Ohno H, Sato S, Sakakibara Y, Suzuki H, Aritoshi S, Akimoto S, Ban T, Tanihata J, Tachiyashiki K and Imaizumi K. (2010) Acute and subacute effects of dexamethasone on the number of white blood cells. Jounal of Health Science (Tokyo), 56 : 215-220. 【DOI:10.1248/jhs.56.215】

56). Imaizumi K, Sakakibara Y, Sasaki H, Sato S, Takei Y, Hiruma K, Ban T, Kawashima Y, Tanihata J and Tachiyashiki K. (2010) Lowering effects of allyl isothiocyanate on the number of lymphocyte and its subsets in rats. Journal of Health Science (Tokyo), 56 : 347-354. 【DOI:10.1248/jhs.56.347】

57). Imaizumi K, Sato S, Sakakibara Y, Mori S, Ohkuma M, Kawashima Y, Ban T, Sasaki H and Tachiyashiki K. (2010) Allyl isothiocyanate-induced changes in the distribution of white blood cells in rats.
Journal of Toxicological Sciences (Sendai), 35 : 583-589. 【DOI:10.2131/jts.35.583】

58). Imaizumi K, Sato S, Kumazawa M, Arai N, Aritoshi S, Akimoto S, Sakakibara Y, Kawashima Y and Tachiyashiki T. (2011) Capsaicinoids-induced changes of plasma glucose, free fatty acid and glycerol concentrations in rats. Journal of Toxicological Sciences (Sendai), 36 : 101-108. 【DOI:10.2131/jts.36.101】

59). Kawashima Y, Someya Y, Sato S, Shirato K, Jinde M, Ishida S, Akimoto S, Kobayashi K, Sakakibara Y, Tachiyashiki K and Imaizumi K. (2011) Dietary zinc-deficiency and its recovery responses in rat liver cytosolic alcohol dehydrogenase activities. Journal of Toxicological Sciences (Sendai), 36 : 109-11【DOI:10.2131/jts.36.109】

60). Sakakibara Y, Sato S, Kawashima Y, Someya Y, Shirato K, Tachiyashiki K and Imaizumi K. (2011) Different recovery responses from dietary zinc-deficiency in the distribution of rat granulocytes. Journal of Nutritional Science and Vitaminology (Tokyo), 57 : 197-201. 【DOI:10.3177/jnsv.57.197】

61). Kawashima Y, Someya Y, Shirato K, Sato S, Ideno H, Kobayashi K, Tachiyashiki K and Imaizumi K. (2011)Single administration effects of ethanol on the distribution of white blood cells in rats. Journal of Toxicological Sciences (Sendai), 36 : 347-355.【DOI:10.2131/jts.36.347】

62). Sato S, Shirato K, Tachiyashiki K and Imaizumi K. (2011) Synthesized glucocorticoid, dexamethasone regulates the expression of b2-adrenoceptor and glucocorticoid receptor mRNAs but not proteins in slow-twitch soleus muscle of rats. Journal of Toxicological Sciences (Sendai), 36 : 479-486. 【DOI:10.2131/jts.36.479】

63). Sakakibara Y, Sato S, Shirato K, Arai N, Aritoshi S, Ogawa-Nakata N, Kawashima Y, Someya Y, Shiraishi A, Akimoto S, Ideno H, Tachiyashiki K and Imaizumi. (2011) Dietary zinc-deficiency and its recovery responses in the thermogenesis of rats. Journal of Toxicological Sciences (Sendai), 36 : 681-685. 【DOI:10.2131/jts.36.681】

64). Ichinose T, Nomura S, Someya Y, Akimoto S, Tachiyashiki K and Imaizumi K. (2011) Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humans. Scandinavian Journal of Medecine and Science in Sports (John Wiley & Sons), 21 : 598-605. 【DOI:10.1111/j.1600-0838.2009.01077.x】

65). Sato S, Suzuki H, Tsujimoto H, Shirato K, Tachiyashiki K and Imaizumi K. (2011) Casted-immmobilization downregulates glucocorticoid receptor level in rat slow-twich soleusmuscle. Life Sciences (Elsevier), 89 : 923-929. 【DOI:10.1016/j.lfs.2011.10.008】

66). Sato S, Shirato K, Tachiyashiki K and Imaizumi K. (2011) Muscle plasticity and b2-adrenergic receptors : Adaptive responses of b2-adrenergic receptor expression to muscle hypertrophy and atrophy. BioMed Research International (Formerly titled "Journal of Biomedicine and Biotechnology", Cairo, Hindawi Pub), 2011 : Article ID 729598,10 pages.【DOI:10.1155/2011/729598】

67). Ohno H, Shirato K, Sakurai T, Ogasawara JE, Sumitani Y, Sato S, Imaizumi K, Ishida H and Kizaki T. (2012) Effect of exercise on HIF-1 and VEGF signaling. Journal of Physical Fitness and Sports Medicine (Tokyo), 1 : 1-12. 【DOI:10.7600/jpfsm.1.1】

68). Kizaki T, Sato S, Sakurai T, Ogasawara JE, Imaizumi K, Izawa T, Nagasawa J, Saitoh D, Haga S and Ohno H. (2012) The effects of exercise on macrophage functions. Journal of Physical Fitness and Sports Medicine (Tokyo), 1 : 113-123. 【DOI:10.7600/jpfsm.1.113】

69). Sato S, Shirato K, Kizaki T, Ohno H, Tachiyashiki K and Imaizumi K. (2012) Effects of b2-agonists and exercise on b2-adrenergic receptor signaling in skeletal muscles. Journal of Physical Fitness and Sports Medicine (Tokyo), 1 : 139-144. 【DOI:10.7600/jpfsm.1.139】

70). Shirato K, Kizaki T, Ohno H and Imaizumi K. (2012). Effects of exercise on the hexosamine biosynthetic pathway and granulocytes in glycolylation. Journal of Physical Fitness and Sports Medicine (Tokyo), 1 : 145-150. 【DOI:10.7600/jpfsm.1.145】

71). Higashino-Matsui Y, Shirato K, Suzuki Y, Kawashima Y, Someya Y, Sato S, Shiraishi A, Jinde M, Matsumoto A, Ideno H, Tachiyashiki K and Imaizumi K. (2012) Age-dependent effects of fasting on lipolysis and ketone body productions in rats. Environmental Health and Preventive Medicine (Tokyo, Springer), 17 : 157-163. 【DOI:10.1007/s12199-011-0231-0】

72). Nomura S, Kami K, Kawano F, Oke Y, Nakai N, Ohira T, Fujita R, Terada M, Imaizumi K and Ohira Y. (2012) Effects of hindlimb unloading on neurogenesis in the hippocampus of newly weaned rats.
Neuroscience Letters (Elsevier), 509 : 76-81. 【DOI:10.1016/j.neulet.2011.12.022】

73). Hashizume Y, Shirato K, Abe I, Kobayashi A, Mitsuhashi R, Shiono C, Sato S, Tachiyashiki K and Imaizumi K. (2012) Diallyl disulfide reduced dose-dependently the number of lymphocyte subsets and monocytes in rats. Journal of Nutritional Science and Vitaminology (Tokyo), 58 : 294-298. 【DOI:10.3177/jnsv.58.294】

74). Abe I, Shirato K, Hashizume Y, Mitsuhashi R, Kobayashi A, Shiono C, Sato S, Tachiyashiki K and Imaizumi K. (2013) Folate-deficiency induced cell-specific changes in the distribution of lymphocytes and
granulocytes in rats. Environmental Health and Preventive Medicine (Tokyo, Springer), 18 : 76-84. 【DOI:10.1007/s12199-012-0286-6】

75). Ideno H, Shimada A, Imaizumi K, Kimura H, Abe M, Nakashima K and Nifuji A. (2013) Predominant expression of H3K9 methyltransferases in prehypertrophic and hypertrophic chondrocytes during mouse growth plate cartilage development. Gene Expression Patterns (Elsevier), 13 : 84-89. 【DOI:10.1016/j.gep.2013.01.002】

76). Shirato K, Sato S, Sato M, Hashizume Y, Tachiyashiki K and Imaizumi K. (2013) b2-Agonist clenbuterol suppresses bacterial phagocytosis of splenic macrophages expressing high levels of macrophage receptor with collageneous structure. Biological & Pharmaceutical Bulletin (Tokyo), 36 : 475-480. 【DOI:10.1248/bpb.36.475】

77). Sato S, Shirato K, Mitsuhashi R, Inoue D, Kizaki T, Ohno H, Tachiyashiki K and Imaizumi K. (2013) Intracellular b2-adrenergic receptor signaling specificity in mouse skeletal muscle in response to single dose b2-agonist clenbuterol treatment and acute exercise. Jounal of Physiological Sciences (Tokyo, Springer), 63 : 211-218. 【DOI:10.1007/s12576-013-0253-z】

78). Hashizume Y, Shirato K, Sato S, Matsumoto A, Tachiyashiki K and Imaizumi K. (2013) Dose-dependent effects of diallyl disulfide on plasma glucose and free fatty acid levels in rats. Journal of Toxicological Sciences (Sendai), 38 : 879-884. 【DOI:10.2131/jts.38.879】

79). Sato S, Sakurai T, Ogasawara J, Takahashi M, Izawa T, Imaizumi K, Taniguchi N, Ohno H and Kizaki K. (2014) A circadian clock gene, rev-erba,modulates the inflammatory function of macrophage through the negative regulation of Ccl2 expression. Jounal of Immunology (Bethesda, The American Society of Immunologists, Ltd), 192 : 407-417. 【DOI:10.4049/jimmunol.1301982】

80). Ideno H, Shimada A, Kamiunten T, Imaizumi K, Kimura H, Araki R, Abe M, Nakashima K and Nifuji A. (2014) Search for conditions to detect epigenetic marks and nuclear proteins reliably in immunostaining of testis and cartilage. Journal of Histology (Cairo, Hindawi Pub), 2014 : Article ID 658294, 8 pages. 【DOI:10.1155/2014/658294】

81). Shirato K and Imaizumi K. (2014) Post-transcriptional suppression of lipopolysaccharide-stimulated inflammatory responses by middle-aged mice: a possoible role for eukaryotic initiation factor2a. International Journal of Inflammation (Cairo, Hindawi Pub), 2014 : Article ID 292986, 12 pages. 【DOI:10.1155/2014/292986】

82). Suzuki H, Tsujimoto H, Shirato K, Mitsuhashi R, Sato S, Tachiyashiki K and Imaizumi K. (2014) Clenbuterol attenuates immobilization-induced atrophy of type II fibers in the fast-twitch extensor digitorum longus but not in the slow-twitch soleus muscle. Global Jounal of Human Anatomy and Physiology Research (Karachi, Pharma Pub), 1 :10-17.

83). Sato S, Sakurai T, Ogasawara J, Ishibashi Y, Oh-ishi S, Imaizumi K, Haga S, Hitomi Y, Izawa T, OhiraY, Ohno H and Kizaki T.(2014) Direct and indirect suppression of interleukin-6 gene expression in murine macrophages by nuclear orphan receptor REV-ERB alpha a. Scientific World Jounal (Cairo, Hindawi Pub), 2014 : Article ID : 685854, 10 pages. 【DOI:10.1155/2014/685854】

84). Hashizume Y, Shirato K, Tachiyashiki K and Imaizumi K. (2014) Diallyl disulfide administration increases the number of B-lymphocytes in the rat spleen. Fundamental Toxicological Sciences (Sendai), 1 : 125-131. 【DOI:10.2131/fts.1.115】


◆主要学術著書
1). Imaizumi K, Maeda N, Imai A, Maruyama T and Shiga T. Accelerated velocity of red cell aggregation in multiple myeloma : a comparison with that induced by immunoglobulins and IgG-fragments. In : Progress in Microcirculation Research II (Courtice FC, Garlick DG and Perry MA, ed), The University Press of South Wales , Sydney, Australia, pp.134-138 (1984).

2). Satoh M, Imaizumi K, Bessho T and Shiga T. Increased red cell aggregation in diabetes mellitus, correlated to hemoglobin A1 contents. In : Progress in Microcirculation Research II (Courtice FC, Garlick DG and Perry MA, ed), The University Press of South Wales, Sydney, Australia, pp.150-154 (1984).

3). Maeda N, Seike M, Imaizumi K, Kon K and Shiga T. Erythrocyte aggregation induced by immunoglobulin G and related macromolecules studied with rheoscope-image analyzer-computer system.In:Microcirculation in Circulatory Disorders (Manabe H, Zweifach BW and Messmer KM, ed), Springer-Verlag, Tokyo, Berlin, Heiderberg, pp.439-444 (1988).

4). Imaizumi K, Tachiyashiki K and Ogita Z-I. Temperature dependence of swimming exercise-induced change in ethanol metabolism and thermoregulatory responses in the rat. In : High-Altitude Medical
Science (Ueda G, Kusama S and Voekel NF, ed), Shinshu University Press, Matsumoto, Japan, pp.436-453 (1988).

5). Imaizumi K, Tachiyashiki K and Sekiya M. Quantitative analysis of skeletal muscles in dysrophic mice as a model of nonexercise muscular atrophy. In : Fitness for the Aged, Disabled, and Industrial Worker(Kaneko M, ed), Human Kinetics Publisher, IL, USA, pp.169-177 (1990).

6). Imaizumi K. Effect of carbon dioxide on the four-step oxygen binding constants in human adult hemoglobin. In:High-Altitude Medicine (Ueda G, Reeves JT and Sekiguchi M, ed), Shinshu University Press, Matsumoto, Japan, pp.100-110 (1992).

7). Tachiyashiki K and Imaizumi K. Effects of feeding levels and body weight loading on muscle size and visceral organ sizes in rats. In: Adapted Physical Activity -Health and Fitness- (Yabe K, Kusano K
and Nakata H, ed), Springer-Verlag, Tokyo, Berlin, Heiderberg, pp.68-76 (1994).

8). Shiga T, Kosaka H, Kumura E, Tanaka S, kon K, Suda T, Imaizumi K and Maeda N. Fate of hemoglobin-NO, in vitro and in vivo. In : Magnetic Resonance in Medicine (Kamada H, Ohya-Nishiguchi H and Yoshikawa T, ed), Nihon-Igakukan, Tokyo, Japan, pp.243-245 (1994).

9). Imaizumi K and Tachiyashiki K. Growth-related changes in DNA, RNA and protein levels in the hind-limb skeletal muscles of rats. In : The 1997 Nagano Symposium on Sports Sciences (Nose H, Nadel
ER and Morimoto T, ed), Cooper Publishing Group, IL, USA, pp.163-167 (1998).

10). Tachiyashiki K and Imaizumi K. Changes in visceral organ size and skeletal muscle mass during whole body suspension and recovery in rats. In : The 1997 Nagano Symoposium on Sports Sciences (Nose H, Nadel ER and Morimoto T, ed), Cooper Publishig Group, IL, USA , pp.168-172 (1998).

11). Nose H, Gisolfi CV and Imaizumi K. Exercise, Nutrition, and Environmental Stress Volume 1, Cooper Publishing Group, IL, USA, pp.1-277 (2001).

12). Nose H, Spriet C and Imaizumi K. Exercise, Nutrition, and Environmental Stress Volume 2, Cooper Publishig Group, IL, USA, pp.1-279 (2002).

13). Nose H, Mack GW and Imaizumi K. Exercise, Nutrition, and Environmental Stress Volume 3, Cooper Publishing Group, IL, USA, pp.1-283 (2003).

14). Shirato K and Imaizumi K. Mechanisms underlying the suppression of inflammatory responses in peritoneal macrophages of middle-aged mice. In :Physical Activity, Exercise, Sedentary Behavior and Health (K Kanosue, et al, eds), Springer Japan, Tokyo, pp.193-202 (2015). 【DOI:10.1007/978-4-431-55333-5_16】

15). Shirato K, Sa

Research Experience

  • 2009
    -
     

    早稲田大学教授併任(スポーツ科学学術院,・4‐2014・3)

  • 2001
    -
     

    早稲田大学教授 (人間科学学術院・生体機能学,・5-現在迄)

  • 1998
    -
     

    兵庫教育大学教授併任 (連合大学院博士課程・生理学,・1-2001・4)

  • 1998
    -
     

    Waseda University, Faculty of Sport Sciences (, Professor)

  • 1998
    -
     

    Waseda University, Faculty of Human Sciences (Present, Professor)

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Education Background

  •  
    -
    1977

    Osaka University Graduate School   Graduate School of Medical Sciences, Doctor Course   Molecular Physiology of Physiological Sciences  

  •  
    -
    1969

    Waseda University   Faculty of Education   Physical Education  

Professional Memberships

  •  
     
     

    Japanese Society of Nutrition Food Science

  •  
     
     

    The Japanese Society of Physical Fitness and Sports Medicine

Research Areas

  • Medical biochemistry / Clinical pharmacy / Physiology

Research Interests

  • Molecular and Cellular physiology, Exercise physiology, Nutritional physiology

Awards

  • The 2-nd award of Japan Society of Exercise and Sports Physiology

    2001.07  

 

Papers

  • 飲酒と健康増進

    今泉和彦, 川島 悠, 立屋敷かおる

    FOOD Style 21 (通巻212号:食品化学新聞社、東京)   19 ( 1 ) 59 - 62  2015.01

  • Diallyl disulfide administration increases the number of B-lymphocytes in the rat spleen

    Hashizume Y, Shirato K, Tachiyashiki K, Imaizumi K

    Fundamental Toxicological Sciences   1 ( 4 ) 115 - 121  2014.11

     View Summary

    Diallyl disulfide (DADS), the major sulfur compound in garlic, reduces the number of circulating T-lymphocytes, B-lymphocytes, and monocytes via activation of the hypothalamus-pituitary-adrenal axis. However, the translocation of those cells that migrate in response to DADS administration is still unclear. Therefore, in this study, we examined the effects of DADS administration on a number of lymphocyte subsets and monocyte-derived cells including macrophages (monocytes/macrophages) in spleen, the largest secondary lymphoid organ. Ten-wk-old male Sprague-Dawley rats were orally administered with DADS (dose = 20 mg/kg body weight) or equivalent volume of vehicle. The spleen was harvested 4 hr after administration, and then the splenic cells were isolated and the total number of cells was counted. T-lymphocytes, B-lymphocytes, natural killer (NK) cells, and monocytes/macrophages were fractionated by flow-cytometry and the total number of these cells was calculated. The total number of splenic cells was significantly increased by 1.18-fold after DADS administration. Among the lymphocyte subsets in the spleen, the number of B-lymphocytes significantly increased by 1.28-fold after DADS administration. The number of T-lymphocytes also showed a tendency to increase. However, the number of NK cells and monocytes/macrophages did not change after DADS administration. These results suggest that B-lymphocytes migrate from the circulation and translocate to the spleen in response to DADS administration.

    DOI CiNii

  • Direct and indirect suppression of interleukin-6-gene expression in murine macrophages by nuclear receptor REV-ERVα

    Sato S, Sakurai T, Ogasawara J, Shirato K, Ishibashi Y, Oh-ishi S, Imaizumi K, Haga S, Izawa T, Ohira, Ohno H, Kizaki T

    Scientific World Journal   2014 ( Article ID:685854 ) 1 - 10  2014.10

    DOI

  • Clenbuterol attenuates immobilization-induced atrophy of type II fibers in the fast-twitch extensor digitorum longus but not in the slow-twitch soleus muscle

    Suzuki H, Tsujimoto H, Shirato K, Mitsuhashi R, Sato S, Tachiyashiki K, Imaizumi K

    Global Journal of Human Anatomy and Physiology Research   1 ( 1 ) 10 - 17  2014.06

  • Post-transcriptional suppression of lipopolysaccharide-stimulated inflammatory responses by macrophages in middle-aged mice: A possible role for eucaryotic initiation factor 2α

    Shirato K, Imaizumi K

    International Journal of Inflammation   2014 ( Article ID 292986 ) 1 - 12  2014.04

    DOI

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Books and Other Publications

  • Functional roles of β2-adrenergic receptors in skeletal muscle hypertrophy and atrophy. In:Physical Activity, Exercise, Sedentary Behavior and Health (Eds. Kanosue K, Oshima S, Cao Z-B and Oka K).

    Sato S, Shirato K, Mitsuhashi R, Suzuki H, Tachiyashiki K, Imaizumi K

    Springer Japan, Tokyo、eBook, Chapter 18, pp.213-234, 【DOI:10.1007/978-4-431-55333-5_18】  2015.08

  • Effects of β2-agonist administration on bacterial phagocytosis by splenic macrophages in mice. In:Physical Activity, Exercise, Sedentary Behavior and Health (Eds. Kanosue K, Oshima S, Cao Z-B and Oka K).

    Shirato K, Sato S, Sato M, Hashizume Y, Tachiyashiki K, Imaizumi K

    Springer Japan, Tokyo, eBook, Chapter 17, pp.203-212, 【DOI:10.1007/978-4-431-55333-5_17】  2015.08

  • Mechanisms underlying the suppression of inflammatory responses in peritoneal macrophages of middle-aged mice. In:Physical Activity, Exercise, Sedentary Behavior and Health (Eds. Kanosue K, Oshima S, Cao Z-B and Oka K).

    Shirato K, Imaizumi K

    Springer Japan, Tokyo, eBook, Chapter 16、pp.193-202、【DOI:10.1007/978-4-431-55333-5_16】  2015.08

  • アルコール摂取は褐色脂肪組織活性を亢進させるか (Topix 15)、pp.148-149、『ここまでわかった 燃える褐色脂肪の不思議』 (斉藤昌之・大野秀樹編)

    白土 健, 今泉和彦

    NAP<http://www.nap-ltd.co.jp/>・東京  2013.06 ISBN: 9784905168256

  • ①救急管理、pp.307-316、②心電図 (ECG) の解釈、pp.317-322、『アメリカスポーツ医学会:運動負荷試験と運動プログラム』 (日本体力医学会体力科学編集委員会<鈴木政登・今泉和彦>監訳)

    川島 悠, 今泉和彦, 川島 悠, 今泉和彦, 全頁監修

    南江堂<http://www.nankodo.co.jp/>・東京  2011.07 ISBN: 9784524262168

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Presentations

  • ◆マウス腹腔マクロファージのo-結合型 N-アセチルグルコサミン修飾に及ぼす自発性運動の影響

    Presentation date: 2015.09

  • ◆ニンニクの主要含硫化合物(diallyl sulfides)投与によるラット総白血球および総リンパ球数の応答

    Presentation date: 2015.09

  • ◆亜鉛欠乏による幼齢ラットの成長抑制とinsulin-like growth factor-1の遺伝子発現応答

    Presentation date: 2015.09

  • ◆亜鉛欠乏による成熟ラットの直腸温および褐色脂肪細胞のUCP1発現の応答

    Presentation date: 2015.09

  • ◆亜鉛欠乏による成熟および幼齢の各ラットの白血球系細胞の応答

    Presentation date: 2015.09

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Research Projects

  • Study on the antiatrophic effects of clenbuterol in skeletal muscle atrophy

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2010
    -
    2012
     

    SUZUKI Hideki, IMAIZUMI Kazuhiko, TSUJIMOTO Hisaya, TACHIYASHIKI Kaoru, SHIRATO Ken, SATO Shogo, MITSUHASHI Ryosuke

     View Summary

    The β2-agonist clenbuterol increases muscle mass by promoting muscle protein synthesis and/or attenuating protein degradation. This study was to investigate the effect of clenbuterol administration on immobilization atrophy in rat skeletal muscle. The findings of the present study showed that clenbuterol attenuated the decrease in muscle mass and single fiber cross-sectional area in the extensor digitorum longus muscle, but did not in soleus muscle. These results suggested that antiatrophic effects are specific for the fast-twitch muscle on the immobilization atrophy in rat skeletal muscle.

  • The relationship between the laterality of chopstick manipulation and vision-recognition feed-back system in humans : Electromyograph analyses

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2008
    -
    2010
     

    TACHIYASHIKI Kaoru, IMAIZUMI Kazuhiko, TANIHATA Jun

     View Summary

    The purpose of the present study is to elucidate the relationship between the laterality of chopstick manipulation and vision-recognition feed-back system in healthy human subjects. The effects of training on the transfer time of the stick sample by chopsticks in the dominant hand non-dominant hand were examined in the vision-free and vision cutoff conditions. In the present study, electromyograms of flexor pollicis brevis, flexor digitorum superficialis, brachio radialis and flexor carpi radialis muscles discharged during hand flexion, hand extension and pickup of stick sample with chopsticks were analyzed before and after training. From these results, training of chopstick manipulation improved nerve-muscle coordination.

  • Ergogenic effects of β_2-agonist, clenbuterol and glucocorticoid in rats

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2002
    -
    2004
     

    IMAIZUMI Kazuhiko, TACHIYASHIKI Kaoru

     View Summary

    The ergogenic effects of/β_2-agonist, clenbuterol (CLE : 0.01-1.0 mg/kg BW) on plasma glucose, triglyceride, total cholesterol, insulin and cyclic AMP concentrations, and plasma volume ratio were studied in rats (1-st Experiment). Effects of CLE (1.0 mg/kg BW/day for 10 days), whole body suspension (WBS for 10 days) and immobilization (IMM for 10 days) on the number of white blood cells in rats (2-nd Experiment).
    1-st Experiment :
    1)CLE increased significantly the plasma glucose, triglyceride, total cholesterol and insulin concentrations in the dose-dependent manner. 2)CLE increased significantly the plasma volume ratio(=ratio of plasma volume to total blood volume) in the dose-dependent manner and the increase of plasma volume ratio was maintained over 10 hours after the admistration, suggesting the increasing action of CLE to extracellular fluid volume. 3)No significant changes of plasma cyclic AMP concentration were observed in CLE admistration. These results indicate that CLE increases dose-dependently plasma glucose, triglyceride, total cholesterol, insulin concentrations, and extracellullar fluid volume (=plasma volume ratio) without changing plasma cyclic AMP concentrations.
    2-nd Experiment :
    1)Numbers of total white blood cells in the IMM, WBS groups were significantly higher than those in the control (CON) groups. No effects of numbers of total white blood cells, however, were observed in CLE-administration. 2)Numbers of neutrophil and monocyte in the IMM, WBS and CLE-administration groups were significantly higher than those in the CON groups. 3)Numbers of lymphocytes did not change with the IMM and WBS. CLE-administration, however, decreased significantly the numbers of lymphocytes to approximately 0.56 times, as compared with the CON group. 4)The IMM and WBS increased signicantly the numbers of basophil than in the CON groups. No significant effects of the numbers of basophil, however, were observed in CLE-administration. 5)The IMM and WBS increased significantly the numbers of eosinophil than in the CON groups. On the contrary, the numbers of eosinophil in CLE-administration group were about 0.53 times significantly lower than those in the CON group. 6)Thymus weights in three groupswere 0.65-0.83 times significantly lower than in the CON groups. Adrenal weights in three groups were also relatively higher than those in the CON groups.
    In conclusion, the IMM, WBS and CLE-administration increased markedly the numbers of neutrophils and monocytes. Although the IMM and WBS increased total white blood cells, the WBS increased more markedly the numbers of monocytes, lymphocytes and basophils than in the IMM. CLE-administration, however, decreased the numbers of lymphocytes and eosinophils.

  • Linkage between whole body suspension-induced muscle a trophy and muscle proteolysis in rats

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    1999
    -
    2001
     

    IMAIZUMI Kazuhiko, TACHIYASHIKI Kaoru

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    The purpose of this study is to examine the effect of whole body suspension on skeletal muscle lysosomal cathepsin B and J activities and muscle dipeptide (anserine and carnosine) contents in rats. Six week male Sprague Dawley rats were divided into the control (CON) group and whole body suspended (WBS) group. The rats of the WBS group were maintained under whole body suspension for 10 days. On the morning of the experimental day, slow-twitch muscle (soleus : SOL) and fast-twitch muscle (gastrocnemius : GAS) were isolated and weighed. Adrenal glands, spleen and thymus also were immediately removed and weighed. Muscle lysosomal cathepsin B and J activities were assayed by fluorimetry, and muscle anserine and carnosine contents were analyzed by HPLC method. The relative weight of SOL muscles was 0.67 times (p<0.001) lower in the WBS group than in the CON group, and that of GAS muscle was not changed by WBS. Lysosomal cathepsin B and J activities in SOL muscles were 2.3 times and 2,2 times, respectively, significantly higher in the WBS group than in the CON group. These lysosomal enzyme activities in GAS muscles, however, were not changed by WBS. Carnosine and anserine contents in SOL muscles were 0.56 times and 0.78 times, respectively, significantly lower in the WBS group than in the CON group. However, these dipeptide contents in GAS muscles were not changed by WBS. These results suggest that whole body suspension-induced SOL muscle atrophy in rats may be associated with higher hydrolytic enzyme activity in slow-twitch muscles.

  • Biochemical and Histological Studies on the Possible Mechanism of Mouse Muscular Hypotrophy

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    1985
    -
    1986
     

    IMAIZUMI Kazuhiko, TACHIYASHIKI Kaoru

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    The homo-type(dy/dy) and hetero-type(dy/?) of male C57BL/6J-dy mice(5-6 wks and 8-9 wks old) were used to elucidate biochemically and histologically the possible mechanism of non-exercise muscular hypotrophy. Whole hindlimb muscles were minced with scissors, and homogenized with 25mM phosphate buffer(pH 7.4) at 0゜C. The homogenate was fractionated into buffer-soluble(F-1), 1.2M KCl-soluble(F-2), 1.2M KCl-insoluble(F-3), ribonucleic acid(RNA), deoxyribonucleic acid(DNA) and protein. Serial cross section(10 <mu> m thick) of paraffin embedded M. gasrocnemius and M. soleus were stained with hematoxylin and eosin. The numbers of nucleus and muscle fiber per unit area( <1mm^2> ) and the area of cross section of muscle fiber were determined. 1). [DNA] and [RNA] of hindlimb muscles in dy/dy mice was 2.5-2.8 times and 1.5-1.8 times higher than that in dy/? mice, respectively. Each nucleic acid concentration decreased significantly by muscular hypotrophy. 2). [protein] of the muscle tissue in dy/dy mice was 1.22 times lower than that in dy/? mice. 3). Apparent muscle cell volume in dy/dy mice estimated from [protein]/DNA and muscle weight/DNA, was 7.9 times and 3.0-3.4 times lower than those in dy? mice, respectively. 4). The order of decrease of protein contents in each muscle fraction by muscle hypotrophy was F-2>F-3>F-1, indicating that the decrease of protein content is not identical with each fraction. 5). Electrophoretic pattern of muscle proteins in each fraction was changed drastically by muscle hypotrophy, indicating that the hypotrophy changes the fractional composition ratio of muscle proteins. 6). The numbers of nucleus in dy/dy mice was 1.9 times larger than that in dy/? mice. 7). The ratio of the number of centronucleus to total numbers of nucleus in dy/dy mice was 9.5 times larger than that in dy/? mice. 8). Area frequency distribution of muscles in dy/dy mice deviated from the normal distribution profile in dy/? mice. The mean area(0.0049 <mm^2> ) of the cross section in dy/dy mice was 0.68 times smaller than that(0.0072 <mm^2> ) in dy/? mice. 9). The possible mechanism of muscle hypotrophy was discussed in detail.

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Internal Special Research Projects

  • 亜鉛欠乏による骨格筋の成長抑制における糖鎖遺伝子の機能的役割

    2014   白土 健

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    Zinc is one of the essential trace elements for all organisms, and is second in abundance to iron in the body. It is generally accepted that zinc is a cofactor for more than 300 enzymes and about 60% of zinc is contained in skeletal muscle development and its adaptive responses are not fully elucidated. In the present study, we studied the effects of zinc-deficiency on the expression of insulin-like growth factor-1 (IGF-1) receptor (IGF-1R) indifferent types of skeletal muscles in weaned rats. Male Sprague-Dawley rats were fed with a zinc-deficient diet (0.6mg zinc/kg diet) or control diet (35.2 mg/kg diet) for 4 weeks. After the experiment for 2 and 4 weeks, the slow-twitch soleus (SOL) and fast-twitch extensor digitorum longus (EDL) muscles were isolated. Zinc-deficiency for 4 weeks caused a significant reduction in the relative weight of EDL muscles to the body weight. However, that of SOL muscles was not changed by zinc-deficiency. IGF1-R mRNA expression in EDL muscles significantly increased by 1.26- and 1.28-fold in 2 and 4 weeks after the onset of zinc-deficiency, respectively, whereas significant changes were not observed in SOL muscles. By contrast, IGF-1R protein expression in SOL muscles significantly increased by 2.07-fold in 4 weeks after the onset of zinc-deficiency, although significant changes were not observed in EDL muscles. These results suggest that the increased expression og IGF1-R protein in SOL muscles in response to zinc-deficiency play an important role in the attenuation of delayed development of SOL muscles due to reduced plasma levels of IGF-1.

  • 亜鉛欠乏による成熟ラット網状赤血球細胞数と網状赤血球内ヘモグロビン濃度の動態

    2014   白土 健

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    Zinc is known to play an important role forimmune-functions. Recently, we showed that zinc-deficiency in the weaned ratsfor 4 weeks increased the duration-dependently the number of total white bloodcells, granulocytes (neutrophil, eosinophil and basophil) and monocytes in 2-4wks, without changing the number of lymphocytes, T-lymphocytes, B-lymphocytesor natural killer (NK) cells. These results suggest that zinc-deficiencyinduced cell-specific changes in the distribution of granulocytes andlymphocytes in rats. However, precisely how zinc-deficiency affects thedistribution of a variety of matured red cells, including the minor populationof reticulocytes, and the cell specificity of the effects remain unclear.Therefore, we investigated the effects of zinc-deficiency on the circulatingnumber of matured red cells and reticulocytes in adult rats. Male 10-week-oldSprague-Dawley rats were randomly divided into the zinc-deficient diet (ZDD:0.7mgZn/kg diet) group and the control diet (CON:34.8mg Zn/kg diet) group and werefed for 10 weeks. The analyses of the number of matured red cells andreticulocytes, hemoglobin concentrations of matured red cells andreticulocytes, and hematocrit values during the experimental period wereperformed by a flow cytometry technique (Model SF-3000, Sysmex Co). Plasma zincconcentrations during the experimental period were 0.51-0.75 timessignificantly lower in the ZDD group than in the CON group. The numbers ofmatured red cells in both groups increased with the progress of theexperimental period. However, the numbers of matured red cells in the ZDD groupwere gradually inhibited during the experimenal period, as compared with thosein the CON group. The numbers of red blood cells of the ZDD group in 8-9 weekswere 0.89-0.90 times significantly lower than those of the CON group. On the contrary, thenumbers of reticulocytes of the ZDD group in 2-6 weeks were 0.62-0.83 timessignificantlly lower than those of the CON group. The relative ratio of thenumber of reticulocytes to the number of total blood cells in 2-6 weeks were0.62-0.86 times significantly lower in the ZDD group than in the CON group.However, no significant differences between both groups in the relative ratioswere observed in 8-10 weeks. On the other hand, reticulocyte hemoglobinconcentrations in 2-8 weeks were 1.03-1.07 times significantly higher in theZDD group than in the CON group. These results indicate that zinc-deficiency inadult male rats induced reticulocytopenia in 2-6 weeks and then decreased numberof matured red cells in 8-10 weeks. Further studies are needed to clarify themechanism of zinc-deficiency-induced reticulocytopenia in adult male rats.

  • ガーリックの含硫化合物成分摂取によるラットの生体防御機能の亜急性応答と生理的役割

    2013  

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    1. Dose-dependent effects of diallyl disulfide on the number of lymphocyte subsets in rats Diallyl disulfide (DADS) is a major sulfur compound of garlic, and exerts antiinflamatory, immune-modulatory, andenhancing sympathetic activity effects. However, it still remains unclear how DADS affects the distribution of white blood cell subsets, which is essential to execute effective immune responses and partially regulated by adrenal glucocorticoids. In the first paper, therefore, we examined the dose-dependent effects of DADS administration on the circulating number of white blood cells (WBCs) and lymphocyte subsets, and plasma corticosterone concentration in rats. Male 10-week-old Sprague-Dawley rats were divided into the DADS-free and DADS-orally administered (dose=10, 20, and 40mg/kg BW) groups. Blood samples were collected from the tail vein at 0, 1, 2, 4 and 6 hour after the administration. DADS administration decreased dose- and time-dependently the circulating number of total WBCs, total lymphocytes, and monocytes. Within the lymphocyte subsets, the circulating number of T-lymphocytes and B-lymphocytes was significantly reduced 4 hour after DADS administration in a dose-dependent manner, although that of natural killer (NK) cells was not affected. On the other hand, although DADS administration did not significantly change the circulating number of neurtophils, the circulating number of eosinophils and basophils showed a decreasing tendency after DADS administration. In contrast, plasma coriticosterone concentration was increased 2 hour after DADS administration in a dose-dependent manner. These results suggest that DADS administration reduces the circulating number of monocytes and lymphocytes, including especially acquired cells, via the action of corticosterone, and the effects are induced in a dose-dependent manner. 2. Dose-dependent effects of diallyl disulfide on plasma glucose and free fatty acid concentrations in rats In the first paper, we demonstrated that oral administration of DADS (dose=10-40mg/kg BW), the major organosulfur compound of garlic, reduced the circulating number of monocytes and B- and T-lymphocytes in a dose-dependent manner via the action of corticosterone in adult rats. Glucocorticoid action as well as enhanced sympathetic nerve activity can mobilize energy substrates such as glucose and free fatty acid (FFA) into the blood by inducing glycogenolysis and gluconeogenesis in the liver and lipolysis. However, there is a little information on the effects of DADS intake on lipolysis and carbohydrate metabolism. In the second paper, therefore, we examined the dose-dependent responses of plasma glucose and FFA concentrations, in adult rats after oral administration of DADS. We also measured gastric contents as an index of impaired gastric function. Male 10-week-old Sprague-Dawley rats were divided into DADS-free and DADS-administered (dose=10, 20, and 40mg/kg BW) groups. Plasma samples were prepared from whole blood drawn from the tail vein 0, 1, 2, 4 and 6 hour after administration. The stomachs were isolated, and the contents were measured 8 hour after administration. In DADS-administered groups, plasma glucose concentrations were increased in a dose-dependent manner 1 hr after the administration. The increase was transient, except in groups administered 40mg/kg BW of DADS, in which plasma glucose levels remained significantly higher than the DADS-free levels throughout the experimental period. Similar patterns were observed in the plasma FFA concentrations. The gastric contents were dose-dependently elevated after DADS administration. The increase was significant when 20 or 40mg/kg BW of DADS was administered. These results suggest that oral administration of DADS can mobilize energy substrates into the blood, although a higher dose of DADS slows gastric emptying.3. Diallyl disulfide accumulates the number of B-lymphocytes in the rat spleen  In the first paper, we demonstrated that diallyl disulfide (DADS), the major organosulfur compound in garlic, reduced the number T-lymphocytes, B-lymphocyte, and monocytes via activation of the hypothalamus-pituitary- adrenal axis. However, the translocation of these cells that migrate to in responses to DADS administration is still unclear. In the third paper, therefore, we examined the effects of DADS administration on a number of lymphocyte subsets and monocytes-derived cells including macrophages (monocytes/macrophages) in spleen, the largest secondary lymphonoid organ. Male 10-week-old Sprague-Dawley rats were orally administered with DADS (dose=20mg/kg BW) or equivalent volume of vehicle. The spleen was harvested 4 hour after administration, and then the splenic cells were isolated, and the total number of cells was counted. T-lymphocytes, B-lymphocytes, natural killer (NK) cells, and monocytes/macrophages were fractionated by flow-cytometry and the total number of these cells was calculated. The total number of splenic cells was significantly increased by 1.18-fold after DADS administration. Among the lymphocyte subsets in the spleen, the number of B-lymphocytes was significantly increased by 1.28-fold after DADS administration. The number of T-lymphocytes also showed a tendency to increase. However, the number of NK cells, and monocytes/macrophages did not change after DADS administration. These results suggest that B-lymphocytes migrate from the circulation and translocate to the spleen in response to DADS administration.

  • 骨格筋の可塑性に及ぼすβ2-アドレナリン受容体発現レベルの応答とその機能的役割

    2011   白土 健

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    【研究の背景と目的】骨格筋サイズは筋活動量の増減によって可塑的に変動する。一方、最近では高齢者や各種疾患者および宇宙飛行士の筋萎縮の予防や筋萎縮からの回復を目的とした研究が進展している。これまで、私達はこのような骨格筋の可塑的なサイズ変化の一部を担う生体内のホルモン受容体のうちβ2-adrenergic receptor(β2-AR)およびglucocorticoid receptor (GR)の発現レベルの変化について系統的に研究してきた。そこで本研究では、身体不活動による筋萎縮機構をさらに明らかにするため、ギプス固定によってラットの筋活動量を著しく低下させたとき、骨格筋内のβ2-ARと GR mRNA・タンパク質発現レベルがどのように応答するかをしらべた。【方法】約8週齢の雄性Sprague Dawleyラットをpentobarbital(dose=45mg/kg body weight)麻酔下で膝関節および足関節をギプスで固定した群と対照群とに群分けをし、その11日後に遅筋線維の比率が高いヒラメ筋(SOL: soleus)と速筋線維の比率が高い長指伸筋(EDL:extensor digitorum longus)を摘出・秤量した。両骨格筋のRNAおよびタンパク質を常法により抽出し、GRとβ2-ARの遺伝子発現はreal-time RT-PCR法で、タンパク質発現はWestern blot法で定量した。【結果】ギプス固定によりラット骨格筋の相対重量、総RNA量および総タンパク質濃度はSOL筋で低下したが、EDL筋では変化しなかった。これらの結果より、ギプス固定による筋萎縮作用は抗重力筋の遅筋に対して特異的であることが確認された。実験期間中の血漿内アドレナリン・ノルアドレナリン・コルチコステロンの各濃度はギプス固定によって変化がみられなかった。筋内GR mRNA・タンパク質発現はギプス固定によりSOL筋で特異的に低下した。骨格筋細胞内のGRおよびリガンドの複合体は筋萎縮関連遺伝子の転写を正に制御していることから、GR発現レベルの低下は遅筋での筋萎縮に対する抑制的な応答であると推定できる。また、β2-AR mRNA発現もギプス固定によりSOL筋で特異的に低下したが、β2-ARタンパク質発現は両筋共にギプス固定による変動がみられなかった。β2-AR遺伝子上にはglucocorticoid receptor element(GRE)が存在することから、GR発現量の低下によってβ2-ARの転写が抑制されたものと推定できる。【結論】ギプス固定によりGR発現レベルは遅筋のSOL筋で特異的に低下する。その結果、GRの下流シグナル伝達が抑制され、筋タンパク質分解やβ2-ARのような標的遺伝子の発現あるいは抗炎症反応などの応答が弱まるものと推定できる。

  • タンパク質合成ステロイドおよびβ2アゴニストによる骨格筋肥大効果と体質改善効果

    2005   立屋敷かおる, 一之瀬 貴

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    【目的】タンパク質合成アンドロジェニックステロイドおよびβ2アゴニストの一つであるクレンブテロール (Clenbuterol:CLE) による骨格筋タンパク質量の増加作用とそのメカニズムを明確にするため、CLEをラットに投与した際の5種類の骨格筋の重量とタンパク質量、血漿内エネルギー基質(グルコース、トリグリセリド、総コレステロール)、インスリン、サイクリックAMPの各濃度、および血漿容量比(=全血液量に対する血漿量の比率)が如何に変動するかを検討した。【方法】8週齢Sprague Dawley系雄性ラットに0.05~1.0mg/kg体重/dayのCLE量を頸背部皮下より投与し、ヒラメ筋(SOL), ヒフク筋(GAS), 足底筋(PLA), 前脛骨筋(TIB), 長指伸筋(EDL)の各重量とタンパク質量を測定した。また、1.0mg/kg体重のCLE量をラットに投与した際の血漿内エネルギー基質、インスリン、サイクリックAMPの各濃度および血漿容量比などを経時的に測定・解析した。【結果と考察】①CLEをラットに投与すると、GAS, PLA, TIB, EDLなどの速筋の重量やタンパク質量は投与日数と投与量にほぼ比例して有意に増加したが、遅筋のSOLでは有意な変化がみられず、筋タイプによってその効果が異なっていた。②1.0mg/kg体重のCLE量をラットに投与して1時間後の血漿グルコース濃度は投与前の2.2倍、トリグリセリド濃度は1.9倍に増加し、この増加作用はdose-dependent であった。③血漿中の総コレステロール濃度もCLE投与で時間の経過と共に増加し、劇的な変動が観察された。④CLE投与によって血漿内インスリン濃度は有意に増加したが、血漿サイクリックAMP濃度は変動がみられなかった。⑤血漿容量比はCLE投与後著しく上昇し、細胞外腋量の増加が明らかに認められた。この結果より、CLE投与によって血漿内水分が見かけ上多くなり、例えばドーピング薬物が生体内に存在していた場合にはその薬物が希釈されてマスキング作用を持つ可能性があることを示唆する。【結論】CLE投与はラットの4種類の速筋重量とタンパク質量を投与の量と日数にほぼ依存して増加させ、血漿エネルギー基質とインスリンの各濃度および血漿容量比を有意に増加させる。

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