Mitochondrial nitric oxide synthase drives redox signals for proliferation and quiescence in rat liver development

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
María C CarrerasJuan J Poderoso

Abstract

Mitochondrial nitric oxide synthase (mtNOS) is a fine regulator of oxygen uptake and reactive oxygen species that eventually modulates the activity of regulatory proteins and cell cycle progression. From this perspective, we examined liver mtNOS modulation and mitochondrial redox changes in developing rats from embryonic days 17-19 and postnatal day 2 (proliferating hepatocyte phenotype) through postnatal days 15-90 (quiescent phenotype). mtNOS expression and activity were almost undetectable in fetal liver, and progressively increased after birth by tenfold up to adult stage. NO-dependent mitochondrial hydrogen peroxide (H(2)O(2)) production and Mn-superoxide dismutase followed the developmental modulation of mtNOS and contributed to parallel variations of cytosolic H(2)O(2) concentration ([H(2)O(2)](ss)) and cell fluorescence. mtNOS-dependent [H(2)O(2)](ss) was a good predictor of extracellular signal-regulated kinase (ERK)/p38 activity ratio, cyclin D1, and tissue proliferation. At low 10(-11)-10(-12) M [H(2)O(2)](ss), proliferating phenotypes had high cyclin D1 and phospho-ERK1/2 and low phospho-p38 mitogen-activated protein kinase, while at 10(-9) M [H(2)O(2)](ss), quiescent phenotypes had the opposite pattern. Accordingly...Continue Reading

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