miR-142-3p对人乳腺上皮细胞MCF-10A增殖及乳蛋白合成的影响

MicroRNAs(miRNAs)是一类长度约为22 nt的非编码的调控性小RNA,在诸多生命活动中发挥重要作用,如参与调控细胞的增殖、分化、凋亡及肿瘤的发生发展。本试验应用脂质体转染技术抑制miR-142-3p在人乳腺上皮细胞的表达。试验采用实时荧光定量PCR、Western blotting、细胞增殖分析等技术,探索miR-142-3p对人乳腺上皮细胞增殖及乳蛋白合成的影响。结果显示,miR-142-3p沉默后,催乳素受体(prolactin receptor,PRLR)蛋白表达增强,同时,相关通路蛋白AKT、mTOR、STAT5、cyclinD1表达量均增加,细胞增殖能力增强。结果表明,在人乳腺上皮细胞中,miR-142-3p的沉默使PRLR蛋白表达量升高,通过调控AKT、mTOR、STAT5、cyclinD1相关通路蛋白而促进乳蛋白质的合成和乳腺上皮细胞的增殖。

Effect of miR-142-3p on Cell Proliferation of Human Mammary Epithelial Cells MCF-10A and Synthesis of Milk Protein

MicroRNAs (miRNAs) are a group of small,non-coding RNA molecules about 22 nucleotides to regulate a wide variety of important biological processes,including cell proliferation,differentiation,apoptosis as well as the progression of tumors.Liposome transfection was used to detect the expression of miR-142-3p in human mammary epithelial cells,the effects of miR-142-3p on the cell proliferation,apoptosis and milk protein synthesis were detected by Real-time PCR,Western blotting,cell proliferation analysis.The results indicated that after miR-142-3p being silenced,prolactin receptor (PRLR) protein was increased,at the same time the expressions of related pathways protein AKT,mTOR,STAT5 and cyclinD1 were increased,the ability of cell proliferation was increased.The results suggested that in human mammary epithelial cells,the silence of miR-142-3p could increase the expression of PRLR protein,miR-142-3p could promote the synthesis of milk protein and increase the proliferation of mammary epithelial cells by regulating related pathways proteins AKT,mTOR,STAT5 and cyclinD1.