Overexpression of Linc 4930556M19Rik Suppresses High Glucose-Triggered Podocyte Apoptosis, Fibrosis and Inflammation via the miR-27a-3p/Metalloproteinase 3 (TIMP3) Axis in Diabetic Nephropathy

BACKGROUND: Long non-coding RNAs (lncRNAs) play vital roles in development of diabetic nephropathy (DN). The goal of our study was to investigate the functional roles of long intergenic noncoding RNA (lincRNA) 4930556M19Rik in DN. MATERIAL/METHODS: A DN cell model was constructed by exposing podocytes to high glucose (HG). A subcellular fraction assay was used to determine the level of 4930556M19Rik in the nucleus and cytoplasm of podocytes. Quantitative real-time polymerase chain reaction was used to evaluate expression of 4930556M19Rik and miR-27a-3p. Western blot assay was used to assessed levels of fibrosis-related proteins, podocin, and tissue inhibitor of metalloproteinase 3 (TIMP3). Flow cytometry analysis was performed to analyze cell apoptosis. Enzyme linked immunosorbent assay was used to examine secretion of inflammatory cytokines. Dual-luciferase reporter, RIP, and RNA pull-down assays were used to verify the relationship between miR-27a-3p and 4930556M19Rik or TIMP3. RESULTS: 4930556M19Rik was significantly decreased in HG-stimulated podocytes and mainly enriched in the cytoplasm of podocytes. Elevation of 4930556M19Rik hampered HG-induced cell apoptosis, fibrosis, and inflammatory in podocytes. 4930556M19Rik sponged miR-27a-3p to negatively modulate miR-27a-3p expression. MiR-27a-3p overexpression reversed the impact of 4930556M19Rik mediated cell progression in HG-induced podocytes. Moreover, TIMP3 was the target for miR-27a-3p and miR-27a-3p inhibition slowed podocyte injury by targeting TIMP3. CONCLUSIONS: 4930556M19Rik overexpression slowed HG-induced podocyte injury by downregulating miR-27a-3p and upregulating TIMP3.