LncRNA SNHG1 knockdown inhibits hyperglycemia induced ferroptosis via miR‐16‐5p/ACSL4 axis to alleviate diabetic nephropathy

BACKGROUND: Hyperglycemia accelerates the development of diabetic nephropathy (DN) by inducing renal tubular injury. Nevertheless, the mechanism has not been elaborated fully. Here, the pathogenesis of DN was investigated to seek novel treatment strategies. METHODS: A model of diabetic nephropathy was established in vivo, the levels of blood glucose, urine albumin creatinine ratio (ACR), creatinine, blood urea nitrogen (BUN), malondialdehyde (MDA), glutathione (GSH), and iron were measured. The expression levels were detected by qRT‐PCR and Western blotting. H&E, Masson, and PAS staining were used to assess kidney tissue injury. The mitochondria morphology was observed by transmission electron microscopy (TEM). The molecular interaction was analyzed using a dual luciferase reporter assay. RESULTS: SNHG1 and ACSL4 were increased in kidney tissues of DN mice, but miR‐16‐5p was decreased. Ferrostatin‐1 treatment or SNHG1 knockdown inhibited ferroptosis in high glucose (HG)‐treated HK‐2 cells and in db/db mice. Subsequently, miR‐16‐5p was confirmed to be a target for SNHG1, and directly targeted to ACSL4. Overexpression of ACSL4 greatly reversed the protective roles of SNHG1 knockdown in HG‐induced ferroptosis of HK‐2 cells. CONCLUSIONS: SNHG1 knockdown inhibited ferroptosis via the miR‐16‐5p/ACSL4 axis to alleviate diabetic nephropathy, which provided some new insights for the novel treatment of diabetic nephropathy.