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Puromycin aminonucleoside-induced podocyte injury is ameliorated by the Smad3 inhibitor SIS3.
FEBS Open Bio ( IF 2.8 ) Pub Date : 2020-07-07 , DOI: 10.1002/2211-5463.12916
Lina Jiang 1 , Hong Cui 1 , Jie Ding 2 , Aijun Yang 1 , Yingchao Zhang 1
Affiliation  

Smad3 signaling and transgelin expression are often activated during puromycin aminonucleoside (PAN)‐induced podocyte injury. Here, we investigated whether the Smad3 inhibitor SIS3 can ameliorate damage to injured podocytes. A model of PAN‐induced podocyte injury was constructed using the MPC5 cell line. The effects of SIS3 on the expression of the podocyte cytoskeletal proteins transgelin, p15INK4B, phosphor‐smad3, phosphor‐JAK/stat3, the apoptotic marker cleaved caspase 3, and c‐myc were investigated using western blot. The distribution of F‐actin in PAN‐induced podocyte injury was observed under an immunofluorescence microscope. PAN‐induced podocyte injury altered the distribution of F‐actin and transgelin, and colocalization of these two proteins was observed. Transgelin expression and Smad3 phosphorylation were increased in the MPC5 cell line with prolonged PAN treatment. In addition, c‐myc expression, p15INK4B, and JAK phosphorylation were all increased after treatment with PAN. Treatment with the Smad3 inhibitor SIS3 reversed these phenomena and protected against PAN‐induced podocyte injury. Moreover, stimulating podocytes directly with TGFβ‐1 also led to enhanced expression of transgelin or phosphor‐JAK/stat3, and this could be inhibited by SIS3. In conclusion, transgelin expression was induced through the Smad3 signaling pathway during PAN‐induced podocyte injury, and the resulting abnormal distribution of F‐actin and the enhanced expression of transgelin could be reversed by blockade of this pathway.

中文翻译:

Smad3 抑制剂 SIS3 可改善嘌呤霉素氨基核苷诱导的足细胞损伤。

Smad3 信号传导和转凝胶蛋白表达通常在嘌呤霉素氨基核苷 (PAN) 诱导的足细胞损伤期间被激活。在这里,我们研究了 Smad3 抑制剂 SIS3 是否可以改善对受伤足细胞的损伤。使用 MPC5 细胞系构建 PAN 诱导的足细胞损伤模型。SIS3对足细胞细胞骨架蛋白Transgelin基因,p15基因的表达的影响INK4B、phosphor-smad3、ph​​osphor-JAK/stat3、凋亡标记物裂解的caspase 3 和c-myc 使用蛋白质印迹进行了研究。在免疫荧光显微镜下观察 F-actin 在 PAN 诱导的足细胞损伤中的分布。PAN 诱导的足细胞损伤改变了 F-肌动蛋白和转凝胶蛋白的分布,并观察到这两种蛋白质的共定位。在延长 PAN 处理的 MPC5 细胞系中,Transgelin 表达和 Smad3 磷酸化增加。此外,c-myc 表达、p15 INK4B和 JAK 磷酸化都在用 PAN 处理后增加。用 Smad3 抑制剂 SIS3 治疗逆转了这些现象并防止了 PAN 诱导的足细胞损伤。此外,直接用 TGFβ-1 刺激足细胞也导致转凝胶蛋白或磷-JAK/stat3 的表达增强,这可能被 SIS3 抑制。总之,在 PAN 诱导的足细胞损伤过程中,transgelin 的表达是通过 Smad3 信号通路诱导的,并且可以通过阻断该通路来逆转 F-actin 的异常分布和 transgelin 的表达增强。
更新日期:2020-07-07
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