Nitric oxide is an important regulator of heme oxygenase-1 expression in the lipopolysaccharide and interferon-γ-treated murine macrophage-like cell line J774.1/JA-4

Biological & Pharmaceutical Bulletin
Atsushi KoikeF Amano

Abstract

Heme oxygenase-1 (HO-1) catabolizes the degradation of heme into bilirubin, carbon monoxide, and iron ions. The HO-1 products provide antioxidant cytoprotection in addition to having potent antiinflammatory and immunomodulatory functions. HO-1 is induced by its substrate heme and environmental factors including oxidative and heat stresses. Although previous studies reported that lipopolysaccharide (LPS) induced the expression of both the HO-1 gene and its protein in macrophages, the major regulators of HO-1 expression remain unknown. To identify these regulators, we used two types of cell, the murine macrophage-like cell line J774.1/JA-4 and its LPS-resistant mutant, LPS1916. Based on a comparison of the results obtained with these cells, we found that nitric oxide (NO) was closely linked to the induction of HO-1. Real-time polymerase chain reaction (PCR) showed that the time course for inducible HO-1 mRNA by LPS or LPS+interferon (IFN)-γ was similar to that for inducible NO synthase (iNOS) mRNA. Furthermore, the expression of iNOS mRNA and protein increased earlier than that of HO-1 mRNA and protein. N-Nitro-L-arginine methyl ester, an NO synthase inhibitor, reduced both HO-1 expression and NO production in LPS+IFN-γ-treated J...Continue Reading

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