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作 者:宋志霞[1] 郭银凤[1] 周敏[1] 张晓良[1] 刘必成[1]
机构地区:[1]东南大学附属中大医院肾病内科东南大学医学院,南京210009
出 处:《中华肾脏病杂志》2016年第5期358-364,共7页Chinese Journal of Nephrology
基 金:国家自然科学基金(81370826);江苏省十二五医学重点人才项目(RC2011124);江苏省普通高校研究生科研创新计划项目(KYLX15-0180)
摘 要:目的探讨磷脂酰肌醇3(P13K)/磷酸化丝氨酸/苏氨酸蛋白激酶(p-Akt)信号通路在活性维生素D3保护高糖诱导的足细胞损伤中的作用。方法体外培养小鼠永生系足细胞MPC5,并将其分为5组:正常葡萄糖浓度(NG)组、甘露醇对照(NG+M)组、高糖(HG)组、高糖+不同浓度1,25(OH)2D3(HG+VD)组(分为0.1、1、10、100、1000nmol/L组)、高糖+1,25(0H):D3+P13K抑制剂LY294002(HG+VD+LY294002)组。观察不同浓度的1,25(0H):D3及P13K抑制剂LY294002对高糖条件下培养的足细胞损伤指标的影响。分别采用Western印迹、实时定量PCR和免疫组化等方法检测足细胞裂隙隔膜蛋白nephrin、podocin和足细胞损伤标志蛋白desmin的表达变化,同时检测P13K、Akt、P—Akt等指标改变。结果与HG组相比,HG+VD(100、1000nmol/L)组细胞nephrin、podocinmRNA及蛋白表达明显上调(均P〈0.05);HG+VD(100nmol/L)组DesminmRNA和蛋白表达明显下调(均P〈0.05)。与HG组相比,HG+VD(100nmoFL)组细胞P13K.p85以及p-Akt蛋白表达降低(均P〈0.05)。与HG+VD组相比,HG+VD+LY294002组细胞nephrin、podocin蛋白表达明显减少,desmin表达明显升高(均P〈0.05)。结论1,25(0H):D3能够抑制高糖诱导的足细胞损伤,这一作用可能是通过P13K/p—Akt信号通路而实现的。Objective To investigate the effect of 1,25(OH)2D3 on high glucose induced podocyte injury and its signal transduction mechanism. Methods Differentiated mouse podocytes were exposed to normal glucose, high glucose, and different concentrations of 1,25(OH)2D3 or LY294002 (a selective PI3K inhibitor) for 24 h. PCR and immunofluorescent staining were used to detect nephrin, podocin, and desmin. Western blotting was used to detect protein expression of nephrin, podocin, desmin, PI3K, Akt and p-Akt. Results Compared with high glucose group, 1,25(OH)2D3 (100 nmol/L and 1000 nmol/L) significantly up-regulated the expression of podocin and nephrin in podocytes induced by high glucose (P 〈 0.05). Meanwhile, 1,25(OH)2D3 (100 nmol/L) significantly reduced the expression of desmin (P 〈 0.05). PI3K and p-Akt were obviously reduced in high glucose group. In the presence of 1,25(OH)2D3, the trends were reversed. However the above effects of 1,25(OH)2D3 were abolished when p-Akt was blocked by the PI3K inhibitor LY294002. Conclusions 1,25 (OH)2D3 can inhibit high glucose-induced podocyte injury through PI3K/p-Akt signaling pathway.
关 键 词:骨化三醇 足细胞 高糖 PI3K/p-Akt
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