Rosiglitazone Inhibits Angiotensin II-Induced Proliferation of Glomerular Mesangial Cells via the Gαq/Plcβ4/TRPC Signaling Pathway

Cellular Physiology and Biochemistry

Zhao Chen¹  Jie Gao¹  Dan Zhu¹  Li Wang¹  Jiamei Lu¹  Lifang Tian¹  Rongguo Fu¹  Linting Wei¹  Lining Jia¹  Jiarong Mao² 

[1] a;b

关键词: RSG;    PPAR-γ;    RGS4;    TRPC;    HBZY-1;    Proliferation;   

DOI  :  10.1159/000486056

学科分类：分子生物学，细胞生物学和基因

来源: S Karger AG

【 摘 要 】

Background/Aims Mesangial cell proliferation and extracellular matrix accumulation (ECM) deposition play an important role in the pathogenesis of glomerulosclerosis. TRPC and PPAR-γ can regulate cell proliferation. Angiotensin II (AngII) can induce mesangial cell proliferation and affect TRPC expression. However, the mechanism has not been fully elucidated. This study was designed to investigate the role of TRPC and the effect of rosiglitazone (RSG) in the proliferation of rat glomerular mesangial cells (HBZY-1) that were stimulated by AngII and the underlying mechanisms. Methods Immunofluorescence staining and qRT-PCR were performed to examine the expression levels of TRPCs in HBZY-1. Gene expression levels of TRPC, PPAR-γ, RGS4 (regulators of G protein signaling), the GPCR/Gαq/PLCβ4/TRPC signaling pathway and major downstream molecules (PCNA, SKP2, P21 and P27) were detected by qRT-PCR and western blotting. Additionally, changes in intracellular Ca²⁺ levels were determined through Fluo-4 Ca²⁺ imaging, and the cell cycle was analyzed by flow cytometry. Results Our results found that TRPC1 and 6 were at higher expression levels in HBZY-1 cells. Following AngII stimulation, there were increased levels of TRPC1 and 6, Ca²⁺ entry, PCNA and SKP2, decreased expression levels of P21 and P27 and a reduced G₀/G₁ percentage. Silencing TRPC1 and 6 by siRNAs led to decrease in Ca²⁺ influx, G₀/G₁ cell cycle arrest and cell proliferation. Notably, PPAR-γ activation by RSG upregulated RGS4 expression, which can interact with the Gαq family to inhibit the Gαq-mediated signaling cascade. The results were similar to silencing TRPC1 and 6 by siRNAs. Conclusion All these results indicate that RSG could inhibit HBZY-1 cell proliferation via the Gαq/PLCβ4/TRPC signaling pathway.

【 授权许可】

CC BY-NC-ND