Rosiglitazone Inhibits Angiotensin II-Induced Proliferation of Glomerular Mesangial Cells via the Gαq/Plcβ4/TRPC Signaling Pathway
| Autor: | Li Wang, Jiarong Mao, Lining Jia, Dan Zhu, Rongguo Fu, Linting Wei, Lifang Tian, Jiamei Lu, Jie Gao, Zhao Chen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
PPAR-γ TRPC Physiology G protein Glomerular Mesangial Cell Proliferation RGS4 Phospholipase C beta lcsh:Physiology Cell Line lcsh:Biochemistry TRPC1 Rosiglitazone 03 medical and health sciences Animals RSG lcsh:QD415-436 Cell Proliferation TRPC Cation Channels lcsh:QP1-981 biology Cell growth Chemistry Angiotensin II HBZY-1 Cell biology Rats 030104 developmental biology Mesangial Cells biology.protein GTP-Binding Protein alpha Subunits Gq-G11 Calcium Thiazolidinediones Signal transduction Signal Transduction |
| Zdroj: | Cellular Physiology and Biochemistry, Vol 44, Iss 6, Pp 2228-2242 (2017) |
| ISSN: | 1421-9778 |
| Popis: | 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 Ca 2+ levels were determined through Fluo-4 Ca 2+ 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, Ca 2+ entry, PCNA and SKP2, decreased expression levels of P21 and P27 and a reduced G 0 /G 1 percentage. Silencing TRPC1 and 6 by siRNAs led to decrease in Ca 2+ influx, G 0 /G 1 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. |
| Databáze: | OpenAIRE |
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