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Pulmonary Center, Boston University School of Medicine, Boston, Massachusetts 02118
The glycolytic enzyme glyceraldehyde-3-phosphate
dehydrogenase (GAPDH) is induced by hypoxia in endothelial cells (EC).
To define the mechanisms by which GAPDH is regulated by hypoxia, EC
were exposed to cobalt, other transition metals, carbon monoxide (CO),
deferoxamine, or cycloheximide in the presence or absence of hypoxia for 24 h, and GAPDH protein and mRNA levels were measured. GAPDH was induced in cells by the transition metals cobalt, nickel, and
manganese and by deferoxamine, and GAPDH mRNA induction by hypoxia was
blocked by cycloheximide. GAPDH induction by hypoxia, unlike that of
other hypoxia-regulated genes, was not inhibited by CO or by
4,6-dioxoheptanoic acid, an inhibitor of heme synthesis. GAPDH
induction was not altered by mediators of protein phosphorylation, a
calcium channel blocker, a calcium ionophore, or alterations in redox
state. GAPDH induction by hypoxia or transitional metals was partially
blocked by sodium nitroprusside but was not altered by the inhibitor of
nitric oxide synthase
N
-nitro-L-arginine. These
findings suggest that GAPDH induction by hypoxia in EC occurs via
mechanisms other than those involved in other hypoxia-responsive
systems.
hypoxia; endothelium; erythropoietin; nitric oxide; cobalt
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