The effect of interleukin-1 alpha and the glucocorticoid receptor blocker RU 38486 on total and myofibrillar protein breakdown in skeletal muscle.

The effect of interleukin-1 alpha and the glucocorticoid receptor blocker RU 38486 on total and myofibrillar protein breakdown in skeletal muscle.
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IL-1 α 和糖皮质激素受体阻滞剂 RU 38486 对骨骼肌中总蛋白和肌原纤维蛋白分解的影响。

DOI:
10.1016/0022-4804(91)90045-n
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发表时间:
1991
期刊:
The Journal of surgical research
影响因子:
--
通讯作者:
Fischer,JE
Fischer,JE
中科院分区:
--
文献类型:
--
作者:
Zamir,O;Hasselgren,PO;vonAllmen,D;Fischer,JE

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本研究的目的是验证糖皮质激素介导白介素-1α (IL-1α)诱导的肌肉蛋白水解的假设。选取体重40 ~ 60 g的雄性Sprague-Dawley大鼠,按300 μg/kg分3次腹腔注射重组白细胞介素1α (rIL-1α),每次注射16 h。各组大鼠灌胃糖皮质激素受体阻滞剂RU 38486 (15 mg/kg,分3次,超过16小时)或假灌胃。在其他实验中,我们测试了相同剂量的RU 38486对皮质酮(200 mg/kg,分两次,超过16小时)治疗的大鼠肌肉蛋白水解的有效性。通过测定酪氨酸和3-甲基组氨酸的释放量来测定培养的指长伸肌的总蛋白分解率和肌纤维蛋白分解率。给药il -1α使总肌纤维蛋白和肌纤维蛋白分解分别增加49%和134%。ru38486不影响细胞因子的这种作用。然而,相同剂量的RU 38486完全阻断了皮质酮诱导的总蛋白和肌纤维蛋白分解的增加。结果表明,il -1α诱导的肌肉蛋白水解不是糖皮质激素介导的。
The purpose of the present study was to test the hypothesis that muscle proteolysis induced by interleukin-1α (IL-1α) is mediated by glucocorticoids. Male Sprague-Dawley rats, weighing 40–60 g, were treated with recombinant IL-1α (rIL-1α), 300 μg/kg in three divided intraperitoneal doses over 16 hr, or corresponding control injections. Groups of rats received the glucocorticoid receptor blocker RU 38486 by gavage (15 mg/kg in three divided doses over 16 hr) or were subjected to sham-gavage. In other experiments we tested the effectiveness of the same dose of RU 38486 to block muscle proteolysis in rats treated with corticosterone (200 mg/kg in two divided doses over 16 hr). Total and myofibrillar protein breakdown rates in incubated extensor digitorum longus muscles were determined by measuring release of tyrosine and 3-methylhistidine, respectively. Administration of rIL-1α increased total and myofibrillar protein breakdown by 49 and 134%, respectively. This effect of the cytokine was not affected by RU 38486. The same dose of RU 38486, however, completely blocked the increase in total and myofibrillar protein breakdown induced by corticosterone. The results suggest that muscle proteolysis induced by the administration of rIL-1α is not mediated by glucocorticoids.
大鼠趾长伸肌和比目鱼肌在松弛或静息状态下的总蛋白分解和肌原纤维蛋白分解的调节。
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