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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tempol Reduces Podocyte Apoptosis via PARP Signaling Pathway in Experimental Diabetes Mellitus

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Author(s):
Peixoto, Elisa B. M. I. [1] ; Papadimitriou, Alexandros [1] ; Lopes de Faria, Jacqueline M. [1] ; Lopes de Faria, Jose B. [1]
Total Authors: 4
Affiliation:
[1] Univ Estadual Campinas, Div Nephrol, Dept Internal Med, Renal Pathophysiol Lab, Fac Med Sci, BR-13084971 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: NEPHRON EXPERIMENTAL NEPHROLOGY; v. 120, n. 2, p. E81-E90, 2012.
Web of Science Citations: 10
Abstract

Background/Aims: In diabetic hypertensive rats, tempol reduces albuminuria by restoring the redox imbalance. Increased formation of reactive oxygen species leading to activation of poly(ADP-ribose) polymerase (PARP)-1 and podocyte loss by apoptosis contribute to albuminuria in diabetes mellitus (DM). In the present study, we investigated the hypothesis that in DM tempol reduces albuminuria by inhibition of PARP-induced podocyte apoptosis. Methods: DM was induced in 4-week-old spontaneously hypertensive rats by streptozotocin. Mouse and human podocyte cell lines were cultured in normal or high-glucose conditions, with or without tempol and/or a PARP-1 inhibitor, PJ34. Results: In diabetic rats, tempol treatment did not affect plasma glucose levels or systolic blood pressure. Albuminuria was higher in diabetic rats, and it was reduced by tempol. DM leads to an elevation of glomerular apoptotic cells and to podocyte loss; both were prevented by tempol treatment. DM increases the expression of poly(ADP-ribose)-modified proteins in isolated glomeruli, and it was reduced by tempol. In vitro, high glucose increased caspase-3 activity and led to a higher number of apoptotic cells that were prevented by tempol and the PARP-1 inhibitor. Conclusion: In DM, tempol reduces albuminuria associated with reduction of podocyte apoptosis and decreasing oxidative stress via PARP signaling. Copyright (C) 2012 S. Karger AG, Basel (AU)