乏氧条件下miR—29a通过AMPK调控胰岛β细胞功能的研究
2014-08-20王秀娟孙尧
王秀娟 孙尧
【摘要】 目的:观察乏氧条件下miRNA调节AMPK对胰腺β细胞发挥的作用。方法:经细胞培养及Real-time PCR,观察在乏氧条件下miR-29a通过AMPK调控胰岛β细胞功能的发挥。结果:INS-1细胞,主要表达AMPKα2,其磷酸化AMPK活性在乏氧条件下增加。用Real time PCR检测AMPK的表达,发现乏氧说明在胰腺β细胞,主要表达AMPKα2亚基。乏氧能促进HIF-1α表达,促进AMPK的活化。同时AMPK可能受miR-29a的调节。结论:乏氧条件下胰岛β细胞主要表达为AMPKa2,说明AMPK能促进胰岛β细胞细胞增殖。
【关键词】 AMPK; 胰腺β细胞; 乏氧; miR-29a
【Abstract】 Objective:To explore the mechanism by which miRNA plays roles in pancreatic β cells through regulating AMPK under hypoxic condition. Method:Under the condition of lack of oxygen miR - 29 a by AMPK regulation islet beta cell function were observed by cell culture and Real - time PCR.Result:The INS-1 cell primarily expressed AMPKα2, which the phosphorylation activity of AMPK was increased under hypoxic condition. the expression of AMPK was detected by Real time PCR, which suggested that pancreatic β cells primarily expressed AMPKα2 under hypoxic condition. Hypoxia could accelerate the expression of HIF-1α and the activation of AMPK. Meanwhile, AMPK might be regulated by miR-29a.Conclusion:Under the condition of lack of oxygen islet beta cells mainly expressed as AMPKa2, AMPK can promote cell proliferation islet beta cells.
【Key words】 AMPK; Pancreatic β cells; Hypoxia; miR-29a
First-authors address:Hebei United University,Tangshan 063000,China
doi:10.3969/j.issn.1674-4985.2014.18.023
胰腺是一腺体器官,内分泌胰腺包括胰岛,约有100~1000激素分泌细胞散布在外分泌组织和通过血管团相互联系。胰岛的功能主要是通过产生多种激素维持代谢平衡,这些激素调节血糖水平。胰腺β细胞的功能受很多分子的调控包括信号转导通路、各种代谢分子及microRNA(miRNA)等构成一个复杂的网络系统,精确调控其行为[1-3]。miRNA是一种内源性的非编码RNA,广泛存在于真核生物中。而乏氧上调miR-29a通过AMPK抑制胰腺β细胞增殖、促进凋亡及促进自噬。笔者采用分子生物学和细胞生物学的方法研究特分析如下。
1 材料与方法
1.1 材料与试剂
1.1.1 RPMI 1640培养液 RPMI 1640培养基干粉为Invitrogen产品,去离子水配制,每升加入2.0 g的碳酸氢钠,充分溶解后用HCl调pH至7.4,0.22 μm滤膜过滤后4 ℃保存使用。
1.1.2 DMEM培养液 DMEM培养基干粉为Invitrogen 产品。去离子水配制,每升加入3.7 g的碳酸氢钠,充分溶解后用HCl调pH至7.4,0.22 μm滤膜过滤后4 ℃保存使用。
1.1.3 D-Hanks液配制 1 L含有0.12 g Na2HPO4·7H2O,0.06 g KH2PO4,0.35 g NaHCO3,0.4 g KCl,8 g NaCl。
1.1.4 0.25%胰蛋白酶 1L D-Hanks液(pH 7.4)含有2.5 g胰酶,充分溶解后过滤除菌于4 ℃保存。
1.1.5 其他材料 细胞培养用各式培养皿、培养板和其他耗材,均购自Corning公司。……
