Involvement of ADAM17-Klotho Crosstalk in High Glucose-Induced Alterations of Podocyte Function

Overview

Journal Int J Mol Sci

Publisher MDPI

Date 2025 Jan 25

PMID 39859443

Authors

Dorota Rogacka

Patrycja Rachubik

Marlena Typiak

Tomasz Kulesza

Irena Audzeyenka

Moin A Saleem

Honorata Sikora

Natalia Gruba

Magdalena Wysocka

Adam Lesner

Agnieszka Piwkowska

Affiliations

Soon will be listed here.

Abstract

Microalbuminuria is the earliest clinical abnormality in diabetic kidney disease. High glucose (HG) concentrations are associated with the induction of oxidative stress in podocytes, leading to disruption of the glomerular filtration barrier. Our recent study revealed a significant decrease in the membrane-bound fraction of Klotho in podocytes that were cultured under HG conditions. Given that disintegrin and metalloproteinase 17 (ADAM17) is responsible for the shedding of Klotho from the cell membrane, the present study investigated the impact of HG on the interplay between ADAM17 and Klotho in human podocytes. We demonstrated that ADAM17 protein levels significantly increased in urine, renal tissue, and glomeruli from diabetic rats, with a concomitant increase in glomerular albumin permeability. High glucose increased ADAM17 extracellular activity, NADPH oxidase activity, and albumin permeability in podocytes. These effects were reversed after treatment with ADAM17 inhibitor, in cells with downregulated ADAM17 expression, or after the addition of Klotho. Additionally, elevations of extracellular ADAM17 activity were observed in podocytes with the downregulation of Klotho expression. Our data indicate a novel mechanism whereby hyperglycemia deteriorates podocyte function via ADAM17 activation. We also demonstrated the ability of Klotho to protect podocyte function under hyperglycemic conditions in an ADAM17-dependent manner.

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