The role of growth factors on renal tubular cells submitted to hypoxia and deprived of glucose.

Autor: de Souza Durão M Jr; Nephrology Division, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, Brazil. m.durao@uol.com.br, Razvickas CV, Gonçalves EA, Okano IR, Camargo SM, Monte JC, dos Santos OF
Jazyk: angličtina
Zdroj: Renal failure [Ren Fail] 2003 May; Vol. 25 (3), pp. 341-53.
DOI: 10.1081/jdi-120021149
Abstrakt: Background: In acute renal failure (ARF) renal tubular cell death and detachment can be induced by necrotic and apoptotic mechanisms. Several studies have demonstrated some benefits of the use of growth factors in experimental models of ARF.
Methods: MDCK cells were cultured in a glucose-free medium for 24h and were submitted to hypoxia (PO2 around 35 mmHg) for additional 24 h. To evaluate the possible protective role of growth factors, EGF, IGF-I or HGF were added to the medium (20 ng mL). LDH release, viability (acridine orange and ethidium bromide dyes) and quantification of apoptotic cells (Hoechst 33342 dye fluorescence) were determined.
Results: In the injury group, an increase on LDH release (60% vs. 3%) and on number of apoptotic cells (22% vs. 0.2%) which was associated with a reduced cell viability (61% vs. 94%) when compared with controls. Only HGF, not EGF or IGF-I, was able to protect cells from injury. HGF caused a significant reduction on LDH release (30%) and on number of apoptotic cells (5%), with an increase on viability cellular (79%).
Conclusions: HGF decreases cell death on MDCK cells after hypoxic-induced injury, probably acting in both necrotic and apoptotic mechanisms.
Databáze: MEDLINE
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