畜牧兽医学报 ›› 2024, Vol. 55 ›› Issue (10): 4360-4376.doi: 10.11843/j.issn.0366-6964.2024.10.011

• 遗传育种 • 上一篇    下一篇

干扰和过表达CHRNG对牛成肌细胞增殖分化的影响

毛晓宇1(), 杜嘉伟1, 汤嘉玉1, 潘金海1, 蒋蕾1, 孙小磊1, 昝林森1,2, 王洪宝1,2,*()   

  1. 1. 西北农林科技大学动物科技学院, 杨凌 712100
    2. 西北农林科技大学 国家肉牛改良中心, 杨凌 712100
  • 收稿日期:2024-03-13 出版日期:2024-10-23 发布日期:2024-11-04
  • 通讯作者: 王洪宝 E-mail:maoxiaoyu@163.com;wanghongbao@nwsuaf.edu.cn
  • 作者简介:毛晓宇(1999-), 女, 陕西西安人, 硕士, 主要从事动物遗传育种研究, E-mail: maoxiaoyu@163.com
  • 基金资助:
    陕西省科技计划项目-重点研发计划项目(2022GD-TSLD-46-0104);杨凌示范区青年育种专家培育支持计划;2023年陕西省畜禽种业发展项目

Effects of CHRNG Gene on Proliferation and Differentiation of Bovine Myoblasts and Its Mechanism

Xiaoyu MAO1(), Jiawei DU1, Jiayu TANG1, Jinhai PAN1, Lei JIANG1, Xiaolei SUN1, Linsen ZAN1,2, Hongbao WANG1,2,*()   

  1. 1. College of Animal Science and Technology, Northwest A & F University, Yangling 712100, China
    2. National Beef Cattle Improvement Center, Northwest A & F University, Yangling 712100, China
  • Received:2024-03-13 Online:2024-10-23 Published:2024-11-04
  • Contact: Hongbao WANG E-mail:maoxiaoyu@163.com;wanghongbao@nwsuaf.edu.cn

摘要:

旨在研究CHRNG基因对牛成肌细胞增殖分化的影响及其潜在的分子作用途径。本研究从健康3日龄秦川牛背最长肌和后腿肌中分离到成肌细胞,利用腺病毒在秦川牛成肌细胞中过表达及干扰CHRNG基因,分为干扰组(sh-CHRNG)、干扰对照组(sh-NC)、过表达组(OE-CHRNG)、过表达对照组(OE-NC),每组3个重复,采用CCK-8、EdU、qRT-PCR、Western blot、免疫荧光染色等方法分别检测了干扰及过表达CHRNG基因对牛成肌细胞增殖分化的作用;通过RNA-Seq进一步筛选差异基因,富集信号通路。结果表明,过表达及干扰CHRNG均显著下调了细胞周期因子PCNACCNB1、CCND2的表达(P < 0.01),显著上调了CDKN1A的表达(P < 0.01),减少了发生增殖的细胞数量(CCK-8,P < 0.01)且减少了处于S复制期的阳性细胞比例(EdU)。在牛成肌细胞上过表达和干扰CHRNG并诱导分化后D2、4、6进行形态学观察和免疫荧光染色,结果表明干扰和过表达CHRNG抑制牛成肌细胞的分化和肌管形成。qRT-PCR和Western blot结果表明,过表达及干扰CHRNG下调了MYOD1、MYOGMYH3基因mRNA和蛋白水平的表达(P < 0.01)。通过RNA-Seq测序分析发现,过表达CHRNG筛选到的差异基因主要富集在内质网蛋白质加工、IL-17、甲状腺激素合成、PPAR、PI3K-Akt等信号通路,KEGG分析富集的前20条通路中有10条通路与细胞分化相关;干扰CHRNG筛选到的差异基因主要富集在轴突导向、MAPK、PI3K-Akt等信号通路,KEGG分析富集的前20条通路中有8条通路与细胞分化相关。本研究结果表明,过表达和干扰CHRNG基因均能抑制牛成肌细胞的增殖和分化,且过表达和干扰CHRNG引起的差异基因所富集的通路大多与细胞分化相关。

关键词: CHRNG基因, 增殖和分化, 成肌细胞, RNA-Seq

Abstract:

This study aimed to investigate the effect of CHRNG gene on the proliferation and differentiation of bovine myoblasts and its potential molecular pathways. In this study, adenovirus was used to overexpress and interfere with CHRNG gene in Qinchuan cattle myoblasts. This study isolated myoblasts from the longissimus dorsi and hind leg muscles of healthy 3-day-old Qinchuan cattle. Adenovirus overexpression and interference with CHRNG gene were used in Qinchuan cattle myoblasts, which were divided into interference group (sh-CHRNG), interference control group (sh-NC), overexpression group (OE-CHRNG), and overexpression control group (OE-NC), with 3 replicates in each group. CCK-8, EdU, qRT-PCR, Western blot, immunofluorescence staining and other methods were used to detect the effects of interference and overexpression of CHRNG gene on the proliferation and differentiation of bovine myoblasts; Further screening of differential genes and enrichment of signaling pathways were performed through RNA-Seq. The results showed that overexpression and interference with CHRNG significantly downregulated the expression of cell cycle factors PCNA, CCNB1, and CCND2 (P < 0.01), significantly upregulated the expression of CDKN1A (P < 0.01), reduced the number of proliferating cells (CCK-8, P < 0.01), and reduced the proportion of positive cells in the S replication phase (EdU). Overexpression and interference of CHRNG on bovine myoblasts and induction of differentiation were observed by morphological observation and immunofluorescence staining on D2, D4, and D6. The results showed that interference and overexpression of CHRNG inhibited the differentiation of bovine myoblasts and myotube formation. The qRT-PCR and Western blot results showed that overexpression and interference with CHRNG downregulated the mRNA and protein levels of MYOD1, MYOG and MYH3 genes (P < 0.01). Through RNA-Seq sequencing analysis, it was found that the differentially expressed genes screened by overexpressing CHRNG were mainly enriched in endoplasmic reticulum protein processing, IL-17, thyroid hormone synthesis, PPAR, PI3K-Akt and other signaling pathways. Among the top 20 enriched pathways analyzed by KEGG, 10 pathways were related to cell differentiation; The differentially expressed genes screened by CHRNG were mainly enriched in signaling pathways such as axon guidance, MAPK, and PI3K-Akt. Among the top 20 enriched pathways analyzed by KEGG, 8 pathways were related to cell differentiation. The results suggested that overexpression and interference with CHRNG gene can inhibit the proliferation and differentiation of bovine myoblasts, and the pathways enriched by differential genes caused by overexpression and interference with CHRNG are mostly related to cell differentiation.

Key words: CHRNG gene, proliferation and differentiation, myoblast, RNA-Seq

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