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

Autor(es)

Peixoto, Elisa B. M. I. ^[1] ; Papadimitriou, Alexandros ^[1] ; Lopes de Faria, Jacqueline M. ^[1] ; Lopes de Faria, Jose B. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Div Nephrol, Dept Internal Med, Renal Pathophysiol Lab, Fac Med Sci, BR-13084971 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NEPHRON EXPERIMENTAL NEPHROLOGY; v. 120, n. 2, p. E81-E90, 2012.
• Citações Web of Science: 10

Resumo

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)

• Processo FAPESP: 07/51137-5 - Contribuicao do aumento do estresse oxidativo via nad(p)h oxidase para a hipertrofia glomerular e albuminuria de ratos espontaneamente hipertensos e diabeticos.
• Beneficiário: Jose Butori Lopes de Faria
• Modalidade de apoio: Auxílio à Pesquisa - Regular