Triptolide attenuates proteinuria and podocyte apoptosis via inhibition of NF-κB/GADD45B.

Triptolide attenuates proteinuria and podocyte apoptosis via inhibition of NF-κB/GADD45B.
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雷公藤甲素通过抑制 NF-kappaB/GADD45B 减轻蛋白尿和足细胞凋亡。

DOI:
10.1038/s41598-018-29203-1
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发表时间:
2018-07-18
期刊:
影响因子:
4.6
通讯作者:
Liu Z
Liu Z
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang L;Zhang L;Hou Q;Zhu X;Chen Z;Liu Z

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足细胞损伤是蛋白尿的主要原因。雷公藤内酯醇是雷公藤的主要活性成分,具有有效的抗蛋白尿作用。我们使用我们以前开发的诱导足细胞靶向损伤的体内斑马鱼模型,发现雷公藤内酯醇治疗有效地减轻水肿,蛋白尿和足突消失。雷公藤内酯醇还抑制足细胞凋亡在我们的斑马鱼模型和体外。并探讨了雷公藤内酯醇对足细胞保护作用的机制。足细胞全基因组表达谱显示雷公藤内酯醇处理下调凋亡途径相关的GADD 45 B表达。gadd 45 b在斑马鱼足细胞中的特异性过表达可消除雷公藤甲素的保护作用。GADD 45 B是足细胞凋亡的介质,在启动子区含有典型的NF-κB结合位点,NF-κB p65主要反式激活该基因。雷公藤内酯醇可抑制NF-κB信号的激活和NF-κB与GADD 45 B启动子的结合。综上所述,我们的研究结果表明,雷公藤内酯醇通过抑制NF-κB/GADD 45 B信号转导减少蛋白尿和足细胞凋亡,这为雷公藤内酯醇在肾小球疾病中的抗蛋白尿作用提供了新的认识。
Podocyte injury is a primary contributor to proteinuria. Triptolide is a major active component of Tripterygium wilfordii Hook F that exhibits potent antiproteinuric effects. We used our previously developed in vivo zebrafish model of inducible podocyte-target injury and found that triptolide treatment effectively alleviated oedema, proteinuria and foot process effacement. Triptolide also inhibited podocyte apoptosis in our zebrafish model and in vitro. We also examined the mechanism of triptolide protection of podocyte. Whole-genome expression profiles of cultured podocytes demonstrated that triptolide treatment downregulated apoptosis pathway-related GADD45B expression. Specific overexpression of gadd45b in zebrafish podocytes abolished the protective effects of triptolide. GADD45B is a mediator of podocyte apoptosis that contains typical NF-κB binding sites in the promoter region, and NF-κB p65 primarily transactivates this gene. Triptolide inhibited NF-κB signalling activation and binding of NF-κB to the GADD45B promoter. Taken together, our findings demonstrated that triptolide attenuated proteinuria and podocyte apoptosis via inhibition of NF-κB/GADD45B signalling, which provides a new understanding of the antiproteinuric effects of triptolide in glomerular diseases.
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