2007 Fiscal Year Final Research Report Summary
Steroidogenesis in the skeletal muscle
| Project/Area Number |
17300204
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Sports science
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| Research Institution | Teikyo Heisei University (2007)
University of Tsukuba (2005-2006) |
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Principal Investigator |
MESAKI Noboru Teikyo Heisei University, Faculty of Health Care, Professor (30010408)
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| Co-Investigator(Kenkyū-buntansha) |
MAEDA Seiji University of Taukuba, Graduate School of Comprehensive Human Sciences, Lecturer (30282346)
IEMITSU Motoyuki Nara Sangyo University, Research Center for Higher Education, Lecturer (90375460)
AIZAWA Katsuji University of Tsukuba, Graduate School of Comprehensive Human Sciences, Researcher (80375477)
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| Project Period (FY) |
2005 – 2007
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| Keywords | skeletal muscle / sex hormone / autocrine / exercise / aging |
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| Research Abstract |
Sex steroid hormones, such as testosterone and estradiol, play important roles in developing both strength and mass of skeletal muscle. Circulating dehydroepiandrosterone (DHEA)is peripherally taken up and converted to testosterone by 3B-hydroxysteroid dehydrogenase (HSD) and 17B-HSD, and testosterone, in turn, is irreversibly converted to estrogens by aromatase cytochrome P450 (P450arom). Although sex steroid hormones have been implicated in skeletal muscle regulation and adaptation, it is unclear whether skeletal muscles have a local steroidogenic enzymatic machinery capable of metabolizing circulating DHEA. First study, we investigate whether the three key steroidogenic enzymes are present in the skeletal muscle, and are capable of generating sex steroid hormones. These findings are novel and important in that they provide the first evidence showing that skeletal muscles are capable of locally synthesizing sex steroid hormones from circulating DHEA or testosterone. Second study, we examine sex differences in the levels of testosterone, estradiol, and steroidogenesis-related enzymes, such as 3B-HSD, 17B-HSD and P450arom, in the skeletal muscle at rest and after exercise. We studied the gastrocnemius muscles of resting rats(10 weeks old)and exercised rats(10 weeks old, treadmill running, 30 m/min, 30 min). A single bout of exercise can influence the steroidogenic system in skeletal muscle and these alterations differ between sexes. The acute exercise-induced alteration of steroidogenic enzymes may enhance the local steroidogenesis in the skeletal muscle in both sexes.
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[Journal Article] Sex differences in steroidogenesis in skeletal muscle following a single bout of exercise in rats2008
Author(s)
Katsuji, Aizawa, Motoyuki, Iemitsu, Takeshi, Otsuki, Seiji, Maeda, Takashi, Miyauchi, Noboru, Mesaki
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Journal Title
Journal Applied Physiology 104
Pages: 67-74
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Expression of steroidogenic enzymes and synthesis of sex steroid hormones from DHEA in skeletal muscle of rats2007
Author(s)
Katsuji, Aizawa, Motoyuki, Iemitsu, Seiji, Maeda, Subrina, Jesmin, Takeshi, Otsuki, Chishimba N, Mowa, Takashi, Miyauchi, Noboru, Mesaki
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Journal Title
Am J Physiol Endocrinol Metab 292
Pages: E571-E576
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Acute exercise alters the local steroidogenesis in the skeletal muscle of female rats2007
Author(s)
Katsuji, Aizawa, Motoyuki, Iemitsu, Takeshi, Otsuki, Seiji, Maeda, Takashi, Miyauchi, Noboru, Mesaki
Organizer
12th annual congress of the european college of sports science
Place of Presentation
Finland
Year and Date
20070700
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Acute exercise increases tissue levels of sex steroid hormones in the skeletal muscle of male rats2006
Author(s)
Katsuji, Aizawa, Motoyuki, Iemitsu, Seiji, Maeda, Takeshi, Otsuki, Subrina, Jesmin, Takashi, Miyauchi, Noboru, Mesaki
Organizer
Biochemistry of exercise 13th international conference
Place of Presentation
Seoul
Year and Date
20061000
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 骨格筋は性ホルモンを産生する2006
Author(s)
相澤 勝治, 家光 素行, 前田 清司, 大槻 毅, 宮内 卓, 目崎 登
Organizer
第60回日本体力医学会
Place of Presentation
神戸
Year and Date
20060900
Description
「研究成果報告書概要(和文)」より
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[Presentation] Acute exercise alters expression of steroidogenesis-related enzymes in the skeletal muscle of rats2006
Author(s)
Katsuji, Aizawa, Seiji, Maeda, Motoyuki, Iemitsu, Takeshi, Otsuki, Saburina, Jesmin, Takashi, Miyauchi, Noboru, Mesaki
Organizer
11th annual congress of the european college of sports science, JSPFSM exchange symposium(invited symposia)
Place of Presentation
Lausanne
Year and Date
20060700
Description
「研究成果報告書概要(欧文)」より
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