ADAM10 as a major activator of reactive oxygen species production and klotho shedding in podocytes under diabetic conditions

激活剂(遗传学) 活性氧 纺神星 内科学 内分泌学 化学 细胞生物学 生物 医学 受体
作者
Agnieszka Piwkowska,Patrycja Rachubik,Marlena Typiak,Tomasz Kulesza,Irena Audzeyenka,Moin A. Saleem,Natalia Gruba,Magdalena Wysocka,Adam Lesner,Dorota Rogacka
出处
期刊:Biochemical Pharmacology [Elsevier]
卷期号:225: 116328-116328 被引量:1
标识
DOI:10.1016/j.bcp.2024.116328
摘要

Early stages of diabetes are characterized by elevations of insulin and glucose concentrations. Both factors stimulate reactive oxygen species (ROS) production, leading to impairments in podocyte function and disruption of the glomerular filtration barrier. Podocytes were recently shown to be an important source of αKlotho (αKL) expression. Low blood Klotho concentrations are also associated with an increase in albuminuria, especially in patients with diabetes. We investigated whether ADAM10, which is known to cleave αKL, is activated in glomeruli and podocytes under diabetic conditions and the potential mechanisms by which ADAM10 mediates ROS production and disturbances of the glomerular filtration barrier. In cultured human podocytes, high glucose increased ADAM10 expression, shedding, and activity, NADPH oxidase activity, ROS production, and albumin permeability. These effects of glucose were inhibited when cells were pretreated with an ADAM10 inhibitor or transfected with short-hairpin ADAM10 (shADAM10) or after the addition soluble Klotho. We also observed increases in ADAM10 activity, NOX4 expression, NADPH oxidase activity, and ROS production in αKL-depleted podocytes. This was accompanied by an increase in albumin permeability in shKL-expressing podocytes. The protein expression and activity of ADAM10 also increased in isolated glomeruli and urine samples from diabetic rats. Altogether, these results reveal a new mechanism by which hyperglycemia in diabetes increases albumin permeability through ADAM10 activation and an increase in oxidative stress via NOX4 enzyme activation. Moreover, αKlotho downregulates ADAM10 activity and supports redox balance, consequently protecting the slit diaphragm of podocyteσ under hyperglycemic conditions.
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