China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (8): 2771-2777.doi: 10.16431/j.cnki.1671-7236.2021.08.010

• Physiology and Biochemistry • Previous Articles     Next Articles

Study on Regulation of STAT3 Gene on Myogenic Differentiation of Muscle Stem Cells in Guangxi Cattle

LYU Qiao1, ZOU Chaoxia1, WU Yongmei1, ZHANG Ruimen1, ZHENG Zihua2, SHI Deshun1, WEI Yingming2, DENG Yanfei1   

  1. 1. State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Animal Science and Technology, Guangxi University, Nanning 530004, China;
    2. Research Institute of Agriculture and Animal Husbandry Industry Development, Guangxi University, Nanning 530004, China
  • Revised:2021-02-15 Online:2021-08-20 Published:2021-08-19

Abstract: This study was aimed to detect the expression pattern of signal transduction and activator of transcription 3 (STAT3), clone STAT3 gene, construct eukaryotic expression vector, and explore the regulatory effect of STAT3 gene on the differentiation of muscle stem cells in Guangxi cattle.Muscle tissues of Guangxi cattle aged 6, 12 and 18 months, GM and DM stages muscle stem cells were collected, and RNA was extracted and reverse transcribed into cDNA.The expression pattern of STAT3 gene was detected by Real-time quantitative PCR, and the complete coding region sequence of STAT3 gene was amplified to construct over-expression vector pCD-STAT3, so as to test its effects on the differentiation of cattle muscle stem cells.The results of Real-time quantitative PCR showed that STAT3 gene expressed in the muscle tissues of cattle aged at 6, 12 and 18 months, and the expression level was the highest at the age of 18 months and the lowest at 12 months.The expression levels of STAT3 and myogenic regulatory factor 6 (MYF6) genes in differentiated MSCs were extremely significantly higher than those in proliferative MSCs (P<0.01).The coding region of STAT3 gene in Guangxi cattle was 2 313 bp, which was successfully linked with empty vector pcDNA3.1 to construct the overexpression vector pCD-STAT3.The pCD-STAT3 was transferred into muscle stem cells in Guangxi cattle in vitro, the expression of STAT3 gene and myoblast differentiation marker genes myogenic differentiation 1 (MyoD1) and muscle myosin heavy chain (MyHC) in muscle stem cells were extremely significantly increased (P<0.01), and the expression of myopoietin (MyoG) gene was significantly increased (P<0.05).Moreover, the number and size of myotubes in pCD-STAT3 group were significantly higher than those in pcDNA3.1 group (P<0.05).In this study, the expression pattern of STAT3 in longissimus dorsi muscle of Guangxi cattle was investigated, and overexpression of STAT3 gene could significantly promote the differentiation of bovine muscle stem cells, which laid a foundation for further study on the role of STAT3 gene in muscle growth and development and its molecular regulatory mechanism.

Key words: Guangxi cattle; transcription factor; STAT3 gene; muscle stem cell

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