Short- and long-term effects of testosterone on diaphragm in castrated and normal male rats.

Short- and long-term effects of testosterone on diaphragm in castrated and normal male rats.
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睾酮对去势雄性大鼠和正常雄性大鼠膈肌的短期和长期影响。

DOI:
10.1152/jappl.1997.82.1.134
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发表时间:
1997
期刊:
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子:
--
通讯作者:
Valentine,DE
Valentine,DE
中科院分区:
--
文献类型:
--
作者:
Prezant,DJ;Karwa,ML;Kim,HH;Maggiore,D;Chung,V;Valentine,DE

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Prezant,大卫J.,马诺吉湖海伦·卡尔瓦Kim、Diane Maggiore、Virginia Chung和大卫E. Valentine.睾丸激素对去势和正常雄性大鼠横膈膜的短期和长期影响. J.应用.生理学。82(1):134-143,1997.-在去势和性正常的雄性大鼠中研究了短期和长期睾酮缺乏或治疗对膈肌的影响。与对照组大鼠(未处理的正常雄性)相比,睾酮缺乏或处理对肋骨重量没有显著影响。在未经处理的去势雄性,有显着下降,比力,II型纤维横截面积,肌球蛋白重链(MHC)亚型2B后2.5周。在去势男性接受睾酮,有显着增加,在特定的部队,II型总纤维比例面积,和相对表达的所有成人膈肌快MHC亚型(MHC-2all)2.5周后。在接受睾酮的正常男性中,唯一显著的发现是2.5周后MHC-2B增加。在所有组中,最大强直力的增加与MHC-2all之间存在密切相关性。膈肌功能和成分的变化与2.5周时血清睾酮水平的变化密切相关。尽管血清睾酮水平和膈肌成分的变化与2.5周时相似,但10周时膈肌功能无显著变化。这些发现支持了我们的假设,即睾酮的作用依赖于基础循环雄激素水平和研究持续时间。
Prezant, David J., Manoj L. Karwa, Helen H. Kim, Diane Maggiore, Virginia Chung, and David E. Valentine.Short- and long-term effects of testosterone on diaphragm in castrated and normal male rats.J. Appl. Physiol.82(1): 134–143, 1997.—The effects of short- and long-term testosterone absence or treatment on the diaphragm were studied in castrated and sexually normal male rats. Compared with control rats (untreated normal males), testosterone absence or treatment did not significantly affect costal weight. In untreated castrated males, there were significant decreases in specific forces, type II fiber cross-sectional area, and myosin heavy chain (MHC) isoform 2B after 2.5 wk. In castrated males that received testosterone, there were significant increases in specific forces, type II total fiber proportional area, and relative expression of all adult diaphragm fast MHC isoforms (MHC-2all) after 2.5 wk. In normal males that received testosterone, the only significant finding was an increase in MHC-2B after 2.5 wk. Across all groups, there was close correlation between increases in maximum tetanic forces and MHC-2all. Changes in diaphragm function and composition were closely related to changes in serum testosterone levels at 2.5 wk. The lack of significant change in diaphragm function at 10 wk occurred despite changes in serum testosterone levels and diaphragm composition similar to those at 2.5 wk. These findings support our hypothesis that the effects of testosterone are dependent on basal circulating androgen levels and study duration.
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