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Journal of Integrative Agriculture  2024, Vol. 23 Issue (4): 1315-1328    DOI: 10.1016/j.jia.2023.04.008
Animal Science · Veterinary Medicine Advanced Online Publication | Current Issue | Archive | Adv Search |

miR-24-3p promotes proliferation and inhibits apoptosis of porcine granulosa cells by targeting P27

Shengjie Shi1, 2*, Lutong Zhang1, 2*, Liguang Wang1, 2, Huan Yuan1, 2, Haowei Sun1, 2, Mielie Madaniyati1, 2, Chuanjiang Cai2, Weijun Pang1, 2, Lei Gao1, 2#, Guiyan Chu1, 2#

1 College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China

2 Key Laboratory of Animal Genetics, Breeding and Reproduction of Shaanxi Province, Yangling 712100, China

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摘要  

卵巢卵泡发育状态直接影响母猪的繁殖性能,颗粒细胞作为卵泡中最大的细胞群,其增殖直接促进卵泡的生长,其凋亡直接导致卵泡的闭锁,因此,探究关键因子对颗粒细胞增殖、凋亡的作用及机制是至关重要的。miR-24-3p在高产大白×长白二元母猪卵巢组织中的表达水平显著高于低产母猪,并且miR-24-3p在各个物种间是高度保守的,KEGGGO分析表明miR-24-3p可能与细胞增殖和凋亡有关,其靶基因也富集在WntmTOR等与颗粒细胞生理功能相关的信号通路上。然而,miR-24-3p颗粒细胞中的作用尚不清楚。在本研究中,我们通过流式细胞术、5-乙基-2′-脱氧尿苷(EdU)染色和细胞计数等试验,发现miR-24-3p促进了颗粒细胞增殖,增加S期细胞比例,上调细胞周期基因CyclinBCyclinDCyclinECDK4)的mRNA和蛋白水平表达。此外,通过流式细胞术、RT-qPCRWestern Blot等方法,表明miR-24-3p能够抑制颗粒细胞凋亡并影响凋亡相关基因(BCL-2BAX)的表达。在机制上,通过miRBase 、RNAhybrid等在线预测网站对miR-24-3p潜在的靶基因进行生物信息学分析,5个靶基因预测网站中取交集,筛选出17个潜在基因。通过RT-qPCRWestern Blot双荧光素酶报告试验并结合基因的生物学功能进行分析,结果显示,周期蛋白依赖性激酶抑制剂1B (P27/CDKN1B) miR-24-3p细胞增殖和凋亡方面的靶基因。此外,恢复试验证明,过表达P27减弱了miR-24-3p颗粒细胞增殖的促进作用,同时也减弱了miR-24-3p对颗粒细胞凋亡的抑制作用。这些结果表明miR-24-3p通过靶向P27抑制其转录水平进而促进颗粒细胞增殖并抑制颗粒细胞凋亡。本研究从产仔数极端表型差异个体中筛选并鉴定影响繁殖性状的关键miRNA,并结合猪原代细胞培养模型、生物信息学分析、分子生物学试验阐明miR-24-3p影响颗粒细胞增殖凋亡的具体作用及机制。



Abstract  

Ovarian follicle development is associated with the physiological functions of granulosa cells (GCs), including proliferation and apoptosis.  The level of miR-24-3p in ovarian tissue of high-yielding Yorkshire×Landrace sows was significantly higher than that of low-yielding sows.  However, the functions of miR-24-3p on GCs are unclear.  In this study, using flow cytometry, 5-ethynyl-2´-de-oxyuridine (EdU) staining, and cell count, we showed that miR-24-3p promoted the proliferation of GCs increasing the proportion of cells in the S phase and upregulating the expression of cell cycle genes, moreover, miR-24-3p inhibited GC apoptosis.  Mechanistically, on-line prediction, bioinformatics analysis, a luciferase reporter assay, RT-qPCR, and Western blot results showed that the target gene of miR-24-3p in proliferation and apoptosis is cyclin-dependent kinase inhibitor 1B (P27/CDKN1B).  Furthermore, the effect of miR-24-3p on GC proliferation and apoptosis was attenuated by P27 overexpression.  These findings suggest that miR-24-3p regulates the physiological functions of GCs.

Keywords:  miR-24-3p        granulosa cells        proliferation       apoptosis   
Received: 12 December 2022   Accepted: 10 March 2023
Fund: This work was supported by the National Natural Science Foundation of China (32272849), the National Key R&D Program of China (2021YFF1000602), and the  earmarked fund for CARS-35-PIG.  

About author:  Shengjie Shi, E-mail: shisj@nwafu.edu.cn; Lutong Zhang, E-mail: zhanglutong1011@foxmail.com; #Correspondence Lei Gao, E-mail: gaolei5414@nwafu.edu.cn; Guiyan Chu, E-mail: guiyanchu@nwafu.edu.cn * These authors contributed equally to this study.

Cite this article: 

Shengjie Shi, Lutong Zhang, Liguang Wang, Huan Yuan, Haowei Sun, Mielie Madaniyati, Chuanjiang Cai, Weijun Pang, Lei Gao, Guiyan Chu. 2024.

miR-24-3p promotes proliferation and inhibits apoptosis of porcine granulosa cells by targeting P27 . Journal of Integrative Agriculture, 23(4): 1315-1328.

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