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Enhanced Skeletal Muscle Growth In Myostatin-Deficient Transgenic Pigs Had Improved Glucose Uptake In Stretozotocin-Induced Diabetes

文献类型： 外文期刊

作者： Li, B; Cui, WT; Yang, JZ

作者机构：

关键词： Myostatin; Transgenic pig; Meishan; Diabetes; Skeletal muscle

期刊名称： TRANSGENIC RESEARCH

ISSN： 0962-8819

年卷期： 2020 年 29 卷 2 期

页码：

收录情况： JCR（2021版）

摘要： The size of skeletal muscle mass plays a significant role in glucose uptake in healthy and diabetic human subjects. Previously, we have generated myostatin-deficient (MSTN-/-) transgenic pigs via animal cloning technology. MSTN-/- pigs had dramatic phenotype with individual muscle mass increase by 100% over their wild-type controls, which provides a unique large animal model to investigate how enhanced skeletal muscles are beneficial to glucose update in diabetes. We employed intravenous administration of stretozotocin (STZ) to male MSTN-/- and wild-type pigs (100 mg/kg body weight). One month later, blood glucose and insulin concentrations and pancreas histology were examined, STZ-induced diabetes occurred in both MSTN transgenic and wild-type pigs. Histology of pancreas, analysis of pAKT and Glut4 transporter proteins by Western blotting, and real-time qPCR for MSTN gene expression were used in the study. The STZ-treated pigs had increased levels of fasting plasma glucose and insulin levels in comparison with animals receiving sodium citrate buffer, their pancreas also had reduced beta cells and slight increases in lymphocyte. There are significant lower concentrations of fasting plasma glucose and insulin in MSTN-/- pigs than that of wild-type pigs after STZ administration. Detections of pAKT and Glut4 transporter proteins by Western blotting in muscle tissue indicates significant elevations of both proteins in MSTN-/- pigs compared with the wild-type pigs. The results from this pig model suggest that enhanced skeletal muscle by manipulation of myostatin function can improve glucose uptake even in the status of diabetes.

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