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https://hdl.handle.net/20.500.14094/90004219
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2024-04-20
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90004219 (fulltext)
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メタデータID
90004219
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open access
出版タイプ
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タイトル
Increased Muscular 5α-Dihydrotestosterone in Response to Resistance Training Relates to Skeletal Muscle Mass and Glucose Metabolism in Type 2 Diabetic Rats
著者
Horii, Naoki ; Sato, Koji ; Mesaki, Noboru ; Iemitsu, Motoyuki
著者名
Horii, Naoki
著者ID
A0584
研究者ID
1000020584022
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=b09e77be63b04dce520e17560c007669
著者名
Sato, Koji
佐藤, 幸治
サトウ, コウジ
所属機関名
人間発達環境学研究科
著者名
Mesaki, Noboru
著者名
Iemitsu, Motoyuki
収録物名
PLoS ONE
巻(号)
11(11)
ページ
e0165689-e0165689
出版者
Public Library of Science
刊行日
2016-11-10
公開日
2017-10-10
抄録
Regular resistance exercise induces skeletal muscle hypertrophy and improvement of glycemic control in type 2 diabetes patients. Administration of dehydroepiandrosterone (DHEA), a sex steroid hormone precursor, increases 5α-dihydrotestosterone (DHT) synthesis and is associated with improvements in fasting blood glucose level and skeletal muscle hypertrophy. Therefore, the aim of this study was to investigate whether increase in muscle DHT levels, induced by chronic resistance exercise, can contribute to skeletal muscle hypertrophy and concomitant improvement of muscular glucose metabolism in type 2 diabetic rats. Male 20-week-old type 2 diabetic rats (OLETF) were randomly divided into 3 groups: sedentary control, resistance training (3 times a week on alternate days for 8 weeks), or resistance training with continuous infusion of a 5α-reductase inhibitor (n = 8 each group). Age-matched, healthy nondiabetic Long-Evans Tokushima Otsuka (LETO) rats (n = 8) were used as controls. The results indicated that OLETF rats showed significant decrease in muscular DHEA, free testosterone, DHT levels, and protein expression of steroidogenic enzymes, with loss of skeletal muscle mass and hyperglycemia, compared to that of LETO rats. However, 8-week resistance training in OLETF rats significantly increased the levels of muscle sex steroid hormones and protein expression of steroidogenic enzymes with a concomitant increase in skeletal muscle mass, improved fasting glucose level, and insulin sensitivity index. Moreover, resistance training accelerated glucose transporter-4 (GLUT-4) translocation and protein kinase B and C-ζ/λ phosphorylation. Administering the 5α-reductase inhibitor in resistance-trained OLETF rats resulted in suppression of the exercise-induced effects on skeletal muscle mass, fasting glucose level, insulin sensitivity index, and GLUT-4 signaling, with a decline in muscular DHT levels. These findings suggest that resistance training-induced elevation of muscular DHT levels may contribute to improvement of hyperglycemia and skeletal muscle hypertrophy in type 2 diabetic rats.
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人間発達環境学研究科
学術雑誌論文
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© 2016 Horii et al.
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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資源タイプ
journal article
言語
English (英語)
eISSN
1932-6203
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DOI
https://doi.org/10.1371/journal.pone.0165689
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