MicroRNA-22 Promotes Renal Tubulointerstitial Fibrosis by Targeting PTEN and Suppressing Autophagy in Diabetic Nephropathy.

MicroRNA-22 Promotes Renal Tubulointerstitial Fibrosis by Targeting PTEN and Suppressing Autophagy in Diabetic Nephropathy.
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MicroRNA-22 通过靶向 PTEN 并抑制糖尿病肾病自噬促进肾小管间质纤维化

DOI:
10.1155/2018/4728645
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发表时间:
2018
影响因子:
4.3
通讯作者:
Guo B
Guo B
中科院分区:
医学3区
文献类型:
--
作者:
Zhang Y;Zhao S;Wu D;Liu X;Shi M;Wang Y;Zhang F;Ding J;Xiao Y;Guo B

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肾小管间质纤维化(TIF)是糖尿病肾病(DN)的主要特征。越来越多的证据表明,微小核糖核酸(microRNA)在自噬调控中发挥关键作用,并参与糖尿病肾病的发生发展。然而,在糖尿病肾病中,微小核糖核酸、自噬与肾小管间质纤维化之间的确切联系在很大程度上仍不明确。在本研究中,我们的结果显示,糖尿病肾病大鼠出现肾小管间质纤维化,同时自噬受到明显抑制。此外,在糖尿病肾病大鼠肾脏及高糖培养的NRK - 52E细胞中,微小核糖核酸 - 22(miR - 22)表达上调,且与其靶基因磷酸酶及张力蛋白同源物(PTEN)表达降低相关。有趣的是,雷帕霉素诱导自噬可拮抗高糖诱导的Ⅳ型胶原(Col Ⅳ)和α - 平滑肌肌动蛋白(α - SMA)表达。另外,miR - 22的异位表达抑制自噬流,并诱导Col Ⅳ和α - SMA表达,而抑制内源性miR - 22则可有效缓解高糖诱导的NRK - 52E细胞自噬抑制以及Col Ⅳ和α - SMA的表达。PTEN的过表达可发挥保护作用,拮抗高糖及miR - 22诱导的自噬抑制和Col Ⅳ表达。因此,我们的研究结果表明,miR - 22可能通过部分靶向PTEN抑制自噬,从而促进肾小管间质纤维化,这使其成为糖尿病肾病一个新的且有前景的治疗靶点。
Renal tubulointerstitial fibrosis (TIF) is a major feature of diabetic nephropathy (DN). There is increasing evidence demonstrating that microRNAs act as key players in the regulation of autophagy and are involved in DN. However, the exact link among microRNAs, autophagy, and TIF in DN is largely unknown. In this study, our results showed that TIF was observed in DN rats together with obvious autophagy suppression. Moreover, microRNA-22 (miR-22) was upregulated and associated with reduced expression of its target gene phosphatase and tensin homolog (PTEN) in both the kidneys of DN rats and high glucose-cultured NRK-52E cells. Intriguingly, induction of autophagy by rapamycin antagonized high glucose-induced collagen IV (Col IV) and α-SMA expression. In addition, ectopic expression of miR-22 suppressed autophagic flux and induced the expression of Col IV and α-SMA, whereas the inhibition of endogenous miR-22 effectively relieved high glucose-induced autophagy suppression and the expression of Col IV and α-SMA in NRK-52E cells. Overexpression of PTEN protectively antagonized high glucose- and miR-22-induced autophagy suppression and the expression of Col IV. Therefore, our findings indicated that miR-22 may promote TIF by suppressing autophagy partially via targeting PTEN and represents a novel and promising therapeutic target for DN.
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