Journal of Jilin University Medicine Edition ›› 2016, Vol. 42 ›› Issue (05): 905-909.doi: 10.13481/j.1671-587x.20160513

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Protective effect of miR-221 on β cells in mice with diabetic nephropathy and its mechanism

LIJun, DAILiuling, LI Ye, CHA Chunli   

  1. Department of Internal Medicine, First Affiliated Hospital, Kunming Medical University, Kunming 650032, China
  • Received:2015-09-17 Online:2016-09-28 Published:2016-09-29

Abstract:

Objective: To study the influence of miR-221 in the β cells of mice with diabetic nephropathy (DN), and to clarify the protective effect of miR-221 on DN. Methods: Twenty wild type C57BL/6J mice aged 8 weeks were divided into control group and DN group(n=10).The DN mice models were constructed with 14 weeks of high fat diet,and 100mg·kg-1 streptozotocin (STZ) was used to induce the partial insulin deficiency. 10 weeks later the blood glucose, serum creatinine, blood urea nitrogen content and 24h-urinary albumin excretion rate were detected. The β cells of islet were isolated from the DN mice. The expression level of SOCS3 mRNA in β cells of islet was valued by Real-time PCR. The proliferation of pancreatic β cells of islet was examined by MTT assay. The contents of insulin and insulin release levels in pancreatic β cells of islet were detected by ELISA assay. Luciferase reporter gene assay was used to detect the luciferase reporter gene activity of SOCS3. Results: The DN mouse models were constructed successfully. The blood glucose, serum creatinine, blood urea nitrogen and 24h-urinary albumin excretion rate of the mice in DNA group were higher than those in control group(P<0.05). After overexpression of miR-221, the expression level of SOCS3 mRNA in pancreatic β cells of islet and the proliferation ability of β cells of islet of the mice in DN group were lower than those of normal islet cells (P<0.05). Then luciferase reporter gene method found SOCS3 as one of the target genes of miR-221. After overexpression of miR-221, the insulin release level and insulin content in pancreatic β cells of islet were higher than those of normal islet cells(P<0.05). Conclusion: miR-221 can promopt the synthesis and secretion of β cells of islet and inhibit the dysfunction of β cells of islet in the DN mice by down-regulating the SOCS3 level.

Key words: diabetic nephropathy, miR-221, suppressor of cytokine signaling 3, &beta, cells of islet

CLC Number: 

  • R587.1