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Previous studies have revealed that long intergenic non-coding RNA for kinase activation (LINK-A), a long non-coding RNA (lncRNA) promotes disease progression in triple-negative breast cancer by activating hypoxia-inducible factor 1α (HIF1α). However, the activation of HIF1α has also been demonstrated to improve diabetic nephropathy. It is therefore reasonable to expect that LINK-A may also participate in diabetic nephropathy. In the current study, the expression of LINK-A lncRNA and HIF1α was determined in renal biopsies of patients with diabetic nephropathy. LINK-A lncRNA and HIF1α expression levels were detected by reverse transcription quantitative (RT-q) PCR and ELISA in diabetic patients without complications and used as controls. Correlations between LINK-A lncRNA and HIF1α expression were analyzed using Pearson's correlation coefficient. Effects of lncRNA and HIF1α overexpression on LINK-A lncRNA expression, HIF1α expression and cell apoptosis were assessed using RT-qPCR, western blotting and a cell apoptosis assay. The results revealed that LINK-A lncRNA and HIF1α were downregulated in patients with diabetic nephropathy, as well as in diabetic patients without complications. The lowest expression of LINK-A lncRNA and HIF1α were observed in healthy controls. A positive correlation was identified between LINK-A lncRNA and HIF1α in both patients groups, but not in the control group. LINK-A lncRNA and HIF1α overexpression inhibited the apoptosis of mouse podocyte cells under a high glucose treatment. LINK-A lncRNA overexpression also promoted HIF1α expression in mouse podocyte cells, while HIF1α overexpression did not significantly affect LINK-A lncRNA expression. In conclusion, LINK-A lncRNA may activate HIF1α signaling resulting in the improvement of diabetic nephropathy treatment.

LINK‑A lncRNA activates HIF1α signaling and inhibits podocyte cell apoptosis in diabetic nephropathy