【关键词】 亚硒酸钠;p38丝裂原活化蛋白激酶;单核细胞趋化蛋白
Role of sodium selenite in regulating expressions of p38MAPK and MCP1 in rat mesangial cells
【Abstract】 AIM: To observe the effect of sodium selenite on expressions of p38 mitogenactivated protein kinase (p38MAPK) and monocyte chemoattractant protein1 (MCP1) in rat mesangial cell line HBZY1, and to study the mechanism of sodium selenite in preventing diabetic nephropathy. METHODS: Cell line HBZY1 was incubated with high glucose, high insulin, H2O2 and advanced glycosylation end products (AGEs), respectively (control group); simultaneously, the cell line HBZY1 pretreated with sodium selenite was also incubated with the above factors (experimental group). The expressions of p38MAPK and MCP1 were detected and compared in the 2 groups. RESULTS: Four factors increased the expressions of p38MAPK and MCP1 indepently; sodium selenite inhibited the expressions of p38MAPK and MCP1 by the 4 factors distinctly. CONCLUSION:Sodium selenite can suppress the expressions of p38MAPK and MCP1 in the cell line HBZY1, which suggests that sodium selenite may play a significant role in the prevention of diabetic nephropathy by the inhibition of the expressions of p38MAPK and MCP1 in the cell line HBZY1.
【Keywords】 sodium selenite; p38 mitogenactivated protein kinase; monocyte chemoattractant protein1; mesangial cells; diabetic nephropathy
【摘要】 目的: 观察亚硒酸钠对大鼠肾小球系膜细胞系HBZY1表达p38丝裂原活化蛋白激酶(p38MAPK)和单核细胞趋化蛋白1 (MCP1)的影响,从而研究硒在防治糖尿病肾病(DN)中的作用机制. 方法: 分别以高葡萄糖、高胰岛素、过氧化氢和糖基化终末产物(AGEs)刺激HBZY1细胞;先给予100 nmol/L亚硒酸钠预处理后,再分别以上述4种刺激因素孵育HBZY1细胞,分别检测HBZY1细胞p38MAPK和MCP1的表达并比较. 结果: 4种刺激因素均可作为独立因素,导致HBZY1细胞p38MAPK和MCP1表达量增加;亚硒酸钠能抑制上述4种因素所致的p38MAPK和MCP1的表达. 结论: 亚硒酸钠通过抑制p38MAPK和MCP1在HBZY1细胞的表达, 从而有效防治DN的发生发展,表明硒在DN的防治过程中发挥积极作用.
【关键词】 亚硒酸钠;p38丝裂原活化蛋白激酶;单核细胞趋化蛋白1;系膜细胞;糖尿病肾病
【中图号】 R587.24
0引言
近年来国外研究表明单核细胞趋化蛋白1 (monocyte chemoattractant protein1,MCP1)与糖尿病肾病(diabetic nephropathy, DN)有密切关系[1]. p38MAPK是细胞信号传递的交汇点或共同通路[2-3],但它在DN发生中的作用及其与MCP1关系仍不十分清楚;硒是机体必需微量元素之一,其缺乏可加剧DN的氧化应激,并可产生拟高血糖病理状态,从而加剧DN的发生发展[4]. 但其是否作用于p38MAPK和MCP1国内外未见文献报道. 我们分别给予高葡萄糖(HG)、高胰岛素(HI)、过氧化氢(H2O2)和糖基化终末产物(AGEs)孵育HBZY1细胞,观察HBZY1细胞p38MAPK和MCP1的表达以及亚硒酸钠对HBZY1细胞p38MAPK和MCP1表达的影响. 从而明确二者在DN形成中的作用及硒在防治DN中的作用机制.
1材料和方法
1.1材料大鼠肾小球系膜细胞系(HBZY1,中国典型培养物保藏中心CCTCC);新生牛血清、RPMI 1640培养液、辣根过氧化物酶标记的羊抗兔IgG(二抗)(北京中山生物技术有限公司);亚硒酸钠(Karolinska Institute赠送);柱离心式总RNA抽提试剂盒、RTPCR两步法试剂盒、PCR相对分子量标准(TaKaRa公司); PCR引物合成(上海博亚生物技术有限公司),蛋白质相对分子量标记物(BioRad公司);磷酸化p38MAPK兔多抗((Pr
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