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MODERATE DIABETES ALTERS MYOSIN ISOENZYME DISTRIBUTION IN CARDIAC BUT NOT SKELETAL MUSCLE OF MALE RATS

机译:中度糖尿病可增加心脏的肌球蛋白同工酶分布,但不影响成年大鼠的骨骼肌

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Diabetes is known to alter the myosin phenotype of striated muscle, but the impact of the same diabetic state on different types of striated muscles remains unknown. Therefore, this study determined the myosin isoenzyme profile in the left ventricle, soleus, plantaris, and extensor digitorium longus (EDL) of young male rats made moderately diabetic with streptozotocin, (45 mg/kg, ip). Eight weeks after the single streptozotocin injection, tissues were collected and subsequently electrophoretically analyzed for native myosin isoenzyme distribution. Skeletal muscles were additionally analyzed for myosin heavy chain distribution. Neither the native myosin isoform nor the myosin heavy chain (MHC) distribution profiles of the skeletal muscles were altered by the diabetic state. In contrast, the high ATPase cardiac isoform, V1, was significantly replaced by the low ATPase isoform, V3 (p < 0.05). These results demonstrate that striated muscle responds to a moderate diabetic state in a limited and muscle specific fashion. Significantly, the change in the cardiac myosin isoform profile is comparable to that which occurs in a more severe diabetic state. [References: 22]
机译:已知糖尿病会改变横纹肌的肌球蛋白表型,但是同一糖尿病状态对不同类型横纹肌的影响仍然未知。因此,这项研究确定了链脲佐菌素(45 mg / kg,腹膜内注射)对中度糖尿病的年轻雄性大鼠左心室,比目鱼,plant肌和趾长伸肌(EDL)的肌球蛋白同工酶谱。单次链脲佐菌素注射后八周,收集组织,然后电泳分析天然肌球蛋白同工酶分布。另外分析骨骼肌的肌球蛋白重链分布。糖尿病状态既不改变天然肌球蛋白同种型,也不改变骨骼肌的肌球蛋白重链(MHC)分布。相反,高ATPase心脏异构体V1被低ATPase心脏异构体V3显着替代(p <0.05)。这些结果表明,横纹肌以有限且特定于肌肉的方式对中度糖尿病状态作出反应。值得注意的是,心肌肌球蛋白同工型的变化与在更严重的糖尿病状态下发生的变化相当。 [参考:22]

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