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Effect of testosterone on skeletal muscle of young and old male rats
Isayama, Ricardo Noboro; Oishi, Jorge; Cagnon, Valéria Helena Alves; Campos, Gerson Eduardo Rocha.
  • Isayama, Ricardo Noboro; State University of Campinas. Institute of Biology. Department of Anatomy. Campinas. BR
  • Oishi, Jorge; Federal University of São Carlos. Department of Statistics. São Carlos. BR
  • Cagnon, Valéria Helena Alves; State University of Campinas. Institute of Biology. Department of Anatomy. Campinas. BR
  • Campos, Gerson Eduardo Rocha; State University of Campinas. Institute of Biology. Department of Anatomy. Campinas. BR
Braz. j. morphol. sci ; 23(2): 247-253, Apr.-June 2006. ilus, tab
Article in English | LILACS | ID: lil-468064
ABSTRACT
The effects of testosterone on skeletal muscle were assessed in adult male Wistar rats aged 80 days and 1 year. The animals were divided into 4 groups young testosterone (YT), old testosterone (OT), young control (YC), and old control (OC) groups. The YT and OT groups received 15 applications of testosterone cypionate (5 mg/kg) on alternate days and the controls received injections containing sterile oil alone. After 30 days the animals were sacrificed and the soleus (SOL) and extensor digitorum longus (EDL) muscles were analyzed using mATPase histochemistry. After treatment, YT group gained less body weight than YC group and OT group decreased body weight, differently from the body weight gain observed in the OC group. Testosterone treatment did not show significant changes in both relative muscle weight and muscle fiber composition profile. However, in the YT group we observed an increase in the cross-sectional area of type I fibers in the SOL muscle, and type I and IIAD fibers in the EDL muscle. In the OT group, the cross sectional area of type I was decreased in the EDL muscle. These results reveal that testosterone did not cause a shift in muscle fiber type, but the cross-sectional area had fiber type-specific changes.
Subject(s)
Full text: Available Index: LILACS (Americas) Main subject: Testosterone / Muscle, Skeletal / Muscle Fibers, Fast-Twitch / Muscle Fibers, Skeletal Limits: Animals Language: English Journal: Braz. j. morphol. sci Journal subject: Anatomy Year: 2006 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal University of São Carlos/BR / State University of Campinas/BR

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Full text: Available Index: LILACS (Americas) Main subject: Testosterone / Muscle, Skeletal / Muscle Fibers, Fast-Twitch / Muscle Fibers, Skeletal Limits: Animals Language: English Journal: Braz. j. morphol. sci Journal subject: Anatomy Year: 2006 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal University of São Carlos/BR / State University of Campinas/BR