PMID: 9537834Apr 16, 1998Paper

In vitro and in vivo induction of heme oxygenase-1 in rat glial cells: possible involvement of nitric oxide production from inducible nitric oxide synthase

Glia
Y KitamuraT Taniguchi

Abstract

To determine whether heme oxygenase-1 (HO-1) protein is induced by endogenous nitric oxide (NO) in rat glial cultures, we examined the effects of lipopolysaccharide (LPS), interferon-gamma (IFN-gamma), and NO donors such as S-nitroso-N-acetylpenicillamine (SNAP), in mixed glial cells and in vivo rat hippocampus. In cultured glial cells, treatment with LPS induced the expression of 130-kd inducible NO synthase (iNOS) after 6 h, and NO2- accumulation and enhancement of the protein level of 33-kd HO-1 after 12 h. In addition, treatment with SNAP induced HO-1 expression after 6 h. Although NOS inhibitors such as NG-nitro-L-arginine (NNA) and NG-methyl-L-arginine did not change LPS-induced iNOS expression, these inhibitors suppressed both NO2- accumulation and the enhancement of HO-1. Immunocytochemistry showed that treatment with LPS for 24 h induced iNOS immunoreactivity predominantly in ameboid microglia, while this treatment induced HO-1-immunoreactivity in both microglia and astrocytes. In in vivo rat hippocampus, microinjection of LPS plus IFN-gamma, or SNAP after 24 h also induced HO-1 immunoreactivity in reactive microglia and astrocytes. In addition, intraperitoneal administration of NNA inhibited HO-1 immunoreactivity indu...Continue Reading

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Citations

Oct 12, 2012·Journal of Neuroimmune Pharmacology : the Official Journal of the Society on NeuroImmune Pharmacology·Dawn BéraudKathleen A Maguire-Zeiss
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