文献类型： 外文期刊

第一作者： Qian Li-li

作者： Qian Li-li;Xie Jing-yi;Gao Ting;Cai Chun-bo;Jiang Sheng-wang;Bi Han-fang;Xie Shan-shan;Cui Wen-tao;Gao Ting

作者机构：

关键词： MSTN; Meishan pigs; muscle fiber type; muscle fiber development

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：4.384； 五年影响因子：4.021 ）

ISSN： 2095-3119

年卷期： 2022 年 21 卷 1 期

页码：

收录情况： SCI

摘要： Myostatin (MSTN) is a negative regulator of skeletal muscle growth and development. The skeletal muscle in MSTN-/- mice is significantly hypertrophied, with muscle fiber type II increasing significantly while muscle fiber type I decreasing. However, it is still not clear how the skeletal muscle types change in MSTN-/- pigs, and how the mechanism for MSTN regulates fiber types, especially in large animals like pigs. This study conducted a comprehensive analysis of the composition of skeletal muscle fibers in MSTN-/- pigs produced in our laboratory. It was observed that, compared with wild-type (WT) pigs, both the total mass of skeletal muscle and type lib muscle fibers increased significantly (P<0.01), while the type I and type Ila muscle fibers decreased significantly (P<0.01), in MSTN-/- Meishan pigs. In addition, to explore the influence of MSTN on muscle fiber type and its regulation mechanism in the embryonic stage, this study selected a few genes (Myf5, Mef2d, MyoD and Six1) associated with muscle fiber type and validated their expression by quantitative RT-PCR. Herein, it was found that Myh7, Myh2, Myh4 and Myh1 can be detected in the skeletal muscle of pigs at 65 days of gestation (dg). Compared with WT pigs, in MSTN-/- Meishan pigs, Myh7 decreased significantly (P<0.01), while Myh4 (P<0.001) and Myh1 (P<0.05) increased significantly. Meanwhile, the increased expression of Myf5 (P<0.05), Mef2d (P<0.01) and Sixl (P<0.05) in MSTN-/- Meishan pigs suggested that MSTN should regulate the directional development of muscle fiber types in the early stage of embryonic development. Thus, at the embryonic stage, the type II muscle fibers began to increase in MSTN(-/- )pigs. These results can provide valuable information not only for pig meat quality improvement, but also for the study of human skeletal muscle development and disease treatment.

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