The Mechanism of miR-192 in Regulating High Glucose-Induced MCP-1 Expression in Rat Glomerular Mesangial Cells

Author(s): Fenqin Chen, Guozhu Wei, Yang Zhou, Xiaoyu Ma, Qiuyue Wang*.

Journal Name: Endocrine, Metabolic & Immune Disorders - Drug Targets
(Formerly Current Drug Targets - Immune, Endocrine & Metabolic Disorders)

Volume 19 , Issue 7 , 2019

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Abstract:

Background: Although the pathogenetic mechanism of Diabetic Kidney Disease (DKD) has not been elucidated, an inflammatory mechanism may be a potential contributor. Monocyte chemotactic protein-1 (MCP-1) is suggested to be implicated in the development of DKD by playing a role in the infiltration of monocyte/macrophage. The aim of this study was to investigate the expression of MCP-1 under high glucose conditions, as well as the effects of microRNA-192 (miR-192) under these conditions, and to study the regulatory mechanism of MCP-1 in DKD.

Methods: Rat glomerular mesangial cells were cultured in high glucose or isotonic mannitol. The messenger RNA(mRNA) expression of miR-192, miR-200b, miR-200c, E-box-binding homeobox 1 (Zeb1), and MCP-1 was then detected by real-time PCR, and the protein expression of Zeb1 and MCP- 1 was assessed by western blotting. The rat mesangial cells were transfected with an miR-192 inhibitor, NC inhibitor , and transfected with siRNA Zeb1, siNC. The cells were then cultured in high glucose to detect the mRNA expression of miR-192, miR-200b, miR-200c, Zeb1, and MCP-1 using realtime PCR, and Zeb1 and MCP-1 protein expression were determined by western blotting.

Results: MiR-192, miR-200b, miR-200c, and MCP-1 were overexpressed, whereas Zeb1 was downregulated when cultured in high glucose (P < 0.05). After transfection with an miR-192 inhibitor, the expression of miR-192, miR-200b, miR-200c, and MCP-1 was downregulated, whereas Zeb1 was increased, and these differences were statistically significant (P < 0.05). The observed changes in the expression in the NC inhibitor transfection group were similar to that of non-transfected cell lines. Silencing the expression of Zeb1 resulted in a significant increase in the expression of miR-192, miR- 200b, miR-200c, and MCP-1 (P < 0.05). The observed changes in the SiNC transfection group were similar to those of non-transfected cell lines.

Conclusions: MiR-192 expression was upregulated to increase the expression of inflammatory factor MCP-1 by inhibiting the expression of Zeb1, which was mediated by breaking the regulatory loop of Zeb1 and miR-200b/c in rat mesangial cells cultured in high glucose.

Keywords: High glucose, rat glomerular mesangial cells, miR-192, miR-200b, miR-200c, MCP-1.

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Article Details

VOLUME: 19
ISSUE: 7
Year: 2019
Page: [1055 - 1063]
Pages: 9
DOI: 10.2174/1871530319666190301154640
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