Glomerular expression of p27Kip1 in diabetic db/db mouse: role of hyperglycemia

Kidney International
G WolfRolf A K Stahl

Abstract

Early diabetic nephropathy is characterized by glomerular hypertrophy. Previous studies in vitro have demonstrated that mesangial cells exposed to high glucose are arrested in the G1-phase of the cell cycle and express increased levels of the cyclin-dependent kinase inhibitor p27Kip1. The present study was performed to investigate the renal expression of p27Kip1 in db/db mice, a model of diabetes mellitus type II. Glomerular p27Kip1 protein, but not mRNA expression, was strongly enhanced in diabetic db/db mice compared with non-diabetic db/+ littermates. Immunohistochemical studies revealed that this stimulated expression was mainly restricted to the nuclei of mesangial cells and podocytes, but glomerular endothelial cells occasionally also stained positively. Quantification of p27Kip1 positive glomerular cells showed a significant increase of these cells in db/db mice compared with non-diabetic db/+ animals. Although tubular cells revealed a positive staining for p27Kip1 protein, there was no difference between db/+ and db/db mice. Immunoprecipitation experiments revealed that p27Kip1 protein associates with Cdk2 and Cdk4, but not with Cdk6. To test for the influence of hyperglycemia on cell cycle arrest and p27Kip1 expression...Continue Reading

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