Gender-specific effects of dexamethasone treatment on rat diaphragm structure and function.

Gender-specific effects of dexamethasone treatment on rat diaphragm structure and function.
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地塞米松治疗对大鼠膈肌结构和功能的性别特异性影响。

DOI:
10.1152/jappl.1997.82.1.125
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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:
Cahill,J
Cahill,J
中科院分区:
--
文献类型:
--
作者:
Prezant,DJ;Karwa,ML;Richner,B;Maggiore,D;Gentry,EI;Cahill,J

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Prezant,D. J.,M. L. Karwa,B. Richner,D. Maggiore,E. I. Gentry和J. Cahill。地塞米松治疗对大鼠膈肌结构和功能的性别特异性影响。J. Appl. Physiol.82(1):125-133,1997。-在雌性和雄性大鼠中研究了长期地塞米松治疗对膈肌的影响。与配对喂养的对照动物相比,地塞米松给药未显著影响发情周期或血清雌二醇峰值水平;然而,雌性动物的睾酮水平显著升高,雄性动物的睾酮水平显著降低。地塞米松显着降低身体和肋膈重量,但在较小程度上在女性比男性。横膈膜重量的减少与体重的减少成比例。在雌性和雄性中,地塞米松治疗显著降低了膈肌纤维(I型和II型)横截面积和肌球蛋白重链亚型2B的相对表达。除I型纤维萎缩外,这些变化在雌性动物中发生的程度较低。地塞米松没有显着影响特定的力量。地塞米松显著增加男性的抽搐半松弛时间和抗疲劳指数,但不增加女性。总之,长期地塞米松治疗的影响是性别特异性的,女性的影响明显较少,血清睾酮水平的变化与这些结果相关。
Prezant, D. J., M. L. Karwa, B. Richner, D. Maggiore, E. I. Gentry, and J. Cahill.Gender-specific effects of dexamethasone treatment on rat diaphragm structure and function.J. Appl. Physiol.82(1): 125–133, 1997.—The effects of long-term dexamethasone treatment on diaphragm muscle were studied in female and male rats. Compared with pair-fed control animals, dexamethasone treatment did not significantly affect estrous cycling or peak serum estradiol levels; however, testosterone levels were significantly increased in females and decreased in males. Dexamethasone significantly reduced body and costal diaphragm weights, but to a lesser extent in females than in males. Reductions in diaphragm weight were proportional to reductions in body weight. In females and males, dexamethasone treatment significantly decreased diaphragm fiber (types I and II) cross-sectional area and the relative expression of myosin heavy chain isoform 2B. With the exception of type I fiber atrophy, these changes occurred to a lesser extent in females. Dexamethasone did not significantly affect specific forces. Dexamethasone significantly increased twitch one-half relaxation time and fatigue resistance indexes in males but not in females. In conclusion, the effects of long-term dexamethasone treatment were gender specific, with significantly fewer effects in females, and changes in serum testosterone levels were associated with these findings.
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