Effects of miR-31-5p on the Proliferation and Apoptosis of Hair Follicle Stem Cells in Goat
FENG YunKui,, WANG Jian, MA JinLiang, ZHANG LiuMing, LI YongJun,College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu
Abstract 【Objective】 The Yangtze River Delta White Goat is the only goat breed that can produce superior-quality brush hair in China and the world. The transcriptome sequencing results of the research team showed that there were significant differences in the expression level of MAP3K1 in the individual skin tissues of superior-quality brush hair and normal-quality brush hair. This study aimed to explore the key miRNAs that interacted with MAP3K1 during the formation of superior-quality brush hair and their effects on the proliferation and apoptosis of goat hair follicle stem cells. 【Method】 The bioinformatics websites (StrBase, miRDB, TargetScan, miRWalk, DAVID, KEGG, and RNAhybrid) were used to predict and select the miRNAs, with targeted relationship with MAP3K1, and use the online website Venny 2.1 to draw a Venn diagram. Through the construction of miR-31-5p overexpression vector, wild-MAP3K1, wild/Mut-RASA1 Luciferase Reporter assay vector, the relationship between miR-31-5p and MAP3K1, RASA1 was verified, and the effects of miR31-5p on MAP3K1, RASA1 mRNA and protein expression were detected by qPCR and Western Blot. In order to explore the effect of overexpression of miR-31-5p on cell proliferation and apoptosis, the mRNA and protein expression levels of proliferation marker gene (PCNA,CDK1,CCND2), anti-apoptotic gene (Bcl-2) and pro-apoptotic gene (Bax) in hair follicle stem cells transfected with miR-31-5p were detected, and the effects of overexpression of miR-31-5p on the viability, cell cycle and apoptosis of hair follicle stem cells were verified by CCK-8, EdU, flow cytometry. 【Result】 Through the database, the final score of the three miRNAs were predicted, which might relatively highly interact with MAP3K1. Then, combined with the known miRNAs studies in skin and hair follicle cells, miR-31-5p with highest score was selected as research object. After transfection of miR-31-5p, the relative expression of miR-31-5p in cells was detected, and it was found that the expression of miR-31-5p was significantly higher than that in the control group and blank vector group (P<0.01). The results of double luciferase reporter genes showed that overexpression of miR-31-5p could increase the activity of MAP3K1. Combined with Target Scan and KEGG database, it was predicted that miR-31-5p could target RASA1, the upstream inhibitor of MAP3K1 in MAPK signal pathway. In order to verify the relationship between miR-31-5p and RASA1, it was found that overexpression of miR31-5p inhibited the activity of RASA1 (P<0.01); qPCR and Western Blot assays showed that overexpression of miR-31-5p significantly inhibited the expression of mRNA and protein of RASA1 and promoted the expression of MAP3K1 (P<0.01). CCK-8 assays showed that overexpression of miR-31-5p increased the ability of cell proliferation. EdU staining showed that the rate of positive cells overexpressing miR-31-5p was significantly higher than that in the blank group (P<0.01), and promoted cell proliferation. Cell cycle data showed that after overexpression of miR-31-5p, the proportion of cells in G1/G0 phase was 52.23%, which was significantly lower than that in Control group (56.81% P<0.01). It slowed down the cell arrest in G1/G0 phase, but there was no significant difference between S phase and G2/M phase, however there was still an upward trend. Through apoptosis experiment, it was found that the survival rate of miR-31-5p group was 93.8%, and the total apoptosis rate was 4.9%; while that of control group was only 90.1%, and the total apoptosis rate was 8.41%, which indicated that the apoptosis rate decreased significantly after overexpression of miR-31-5p. Finally, the effects of miR-31-5p on proliferation and apoptosis-related genes were detected. It was found that overexpression of miR-31-5p significantly increased the mRNA and protein expression levels of proliferation marker genes and anti-apoptosis genes (Bcl-2), and decreased the mRNA and protein expression levels of pro-apoptosis gene (Bax). According to the results of the research, the molecular mechanism of miR-31-5p in hair follicle stem cells was revealed. 【Conclusion】 miR-31-5p targeted RASA1 and up-regulated the expression level of MAP3K1, thereby promoting the proliferation of hair follicle stem cells and inhibiting their apoptosis. It provided a theoretical basis for further investigating the molecular mechanism that regulates the characteristics of superior-quality brush hair of the Yangtze River Delta White Goats. Keywords:Yangtze River Delta White Goat;superior-quality brush hair trait;hair follicle stem cells;MAP3K1;miR-31-5p;RASA1;proliferation;apoptosis
PDF (1939KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 冯云奎, 王健, 马金亮, 张柳明, 李拥军. miR-31-5p对山羊毛囊干细胞增殖和凋亡的影响. 中国农业科学, 2021, 54(23): 5132-5143 doi:10.3864/j.issn.0578-1752.2021.23.017 FENG YunKui, WANG Jian, MA JinLiang, ZHANG LiuMing, LI YongJun. Effects of miR-31-5p on the Proliferation and Apoptosis of Hair Follicle Stem Cells in Goat. Scientia Acricultura Sinica, 2021, 54(23): 5132-5143 doi:10.3864/j.issn.0578-1752.2021.23.017
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0 引言
【研究意义】长江三角洲白山羊,是国内外唯一能生产优质笔料毛的山羊品种,其颈脊部产出的毛发具有“毛色洁白、挺直有峰、弹性好”等优良性状,为制作高档毛笔的独特原料[1,2]。【前人研究进展】毛发生长与毛囊发育之间存在着密切联系,毛囊生长发育不仅仅影响着绒毛的生长,而且也影响着绒毛的质量[3]。毛囊发育为一个循环的生物系统,包括生长期,退行期和休止期三个阶段,并涉及基因调控的动态变化[4]。课题组前期转录组测序筛选出促分裂原活化蛋白激酶的激酶1(mitogen-activated protein kinase kinase kinase 1, MAP3K1),它是与优质笔料毛性状相关的候选基因之一,在优质笔料毛中RPKM(reads per kilobase per million reads)值为8.7731,在非优质笔料毛个体中RPKM值仅为0.0345,log2Fold Change值为7.49[5]。MAP3K1,又称MEKK1,是MAPK信号通路中的重要调控因子。已有的研究发现,MAP3K1除了参与免疫机制,损伤修复,肿瘤进展和骨骼肌生长发育的调控外,还在毛发形成方面起着至关重要的作用[6]。microRNA是一种短链(20—24 nt)非编码RNA,通过与靶基因的mRNA 3′UTR结合[7,8]进而降解或抑制靶基因表达[9]。miRNAs参与多种生理进程,包括组织发育、器官形成、细胞生长和凋亡等过程[10,11,12]。迄今为止,在毛囊发育过程中鉴定出许多miRNAs,如miR-203[13]、miR-let-7a[14]和miR-196a[15]等对于调节毛囊的发育和再生至关重要。已有的研究指出,miR- 31-5p是与肿瘤相关的miRNA,miR-31-5p在大肠癌、口腔癌、结肠腺癌中通过抑制靶基因的转录或翻译,促进癌细胞的生长、迁移和侵袭等过程[7, 16-17],也有相关文献证实miR-31参与皮肤组织修复,如系统性红斑狼疮、伤口愈合等[18]。最近研究表明,miR-31-5p可与RAS p21蛋白激活剂1(RAS p21 protein activator 1, RASA1)的3′UTR结合,RASA1是RAS / MAPK信号通路的负调节因子,然后激活RAS / MAPK(小鼠皮肤组织中的ERK1 / 2)通路,促进细胞存活[19]。【本研究切入点】关于miR-31-5p在长江三角洲白山羊优质笔料毛形成过程中的作用和调控机制以及在毛囊干细胞中的功能知之甚少。【拟解决的关键问题】本研究通过验证miR-31-5p是否直接靶向RASA1影响MAP3K1,进而激活MAPK信号通路,然后调节长江三角白山羊优质笔料毛的形成,为长江三角洲白山羊的分子选育提供理论依据。
A:miR-31-5p过表达效率;B:MAP3K1双荧光结果;C:RASA1双荧光结果;D:过表达miR-31-5p对MAP3K1和RASA1基因mRNA的影响;E、F:过表达miR-31-5p对MAP3K1和RASA1基因蛋白的影响 Fig. 2The effects of overexpression of miR-31-5p on MAP3K1 and RASA1
A: Overexpression efficiency of miR-31-5p; B: The result of Double-Luciferase Reporter of MAP3K1; C: The result of Double-Luciferase Reporter of RASA1; D: Effects of MAP3K1 and RASA1 mRNA after overexpression of miR-31-5p; E, F: Effects of MAP3K1 and RASA1 protein after overexpression of miR-31-5p
A:CCK-8结果;B:EdU试验染色结果;C:EdU阳性细胞率;D:Control组周期分布图;E:pre-miR-31-5p组周期分布图;F:Control组和pre-miR-31-5p组 G0/G1、S、G2/M期细胞数量对比图 Fig. 3The effects of overexpression of miR-31-5p on the proliferation and cell cycle of hair follicle stem cells
A: Result of CCK-8结果; B: Result of EdU assay; C: Percentage of EdU-positive Cells; D: Periodic distribution diagram of Control; E: Periodic distribution diagram of pre-miR-31-5p; F: Comparison of cell number in G0/G1, S and G2/M phase between the Control and the pre-miR-31-5p
A:Control组细胞凋亡分布图;B:pre-miR-31-5p组细胞凋亡分布图;C:Control组和pre-miR-31-5p组细胞凋亡率对比图 Fig. 4The effect of overexpression of miR-31-5p on the apoptosis of hair follicle stem cells
A: Apoptosis profile of Control; B: Apoptosis profile of pre-miR-31-5p; C: Comparison of apoptosis rate between the Control and the pre-miR-31-5p
A:过表达miR-31-5p对增殖和凋亡相关基因mRNA的影响;B:过表达miR-31-5p对增殖和凋亡相关基因蛋白的影响 Fig. 5The effect of overexpression of miR-31-5p on proliferation and apoptosis related genes
A: Effect of overexpression of miR-31-5p on the mRNA of proliferation and apoptosis related genes; B: Effect of overexpression of miR-31-5p on the proteins of proliferation and apoptosis related genes
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