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A new role for monoamine oxidases in the modulation of macrophage-inducible nitric oxide synthase gene expression.

Abstract：

:This report focuses on the modulatory role of endogenous H(2)O(2) on lipopolysaccharide (LPS)/interferon-gamma (IFN-gamma)-induced inducible nitric oxide synthase (NOS2) gene expression in rat peritoneal macrophages. Exogenously added H(2)O(2) was initially found to inhibit the synthesis of NOS2, which prompted us to assess the effect of the activity of monoamine oxidase (MAO) and semicarbazide-sensitive amine oxidase (SSAO) as H(2)O(2)-forming enzymes on NOS2 gene expression. In the presence of their substrates, tyramine for MAO and benzylamine for SSAO, intracellular synthesis of H(2)O(2) took place with concomitant inhibition of LPS/IFN-gamma-induced NOS2 protein synthesis, as detected by Western blotting, flow cytometry, and immunofluorescence microscopy analyses. Pargyline and semicarbazide, specific inhibitors of MAO and SSAO, respectively, canceled this negative effect of MAO substrates on NOS2 expression. In the presence of Fe(2+) and Cu(2+) ions, inhibition of NOS2 expression was enhanced, suggesting the participation in this regulation of species derived from Fenton chemistry. In addition, the negative effect of H(2)O(2), generated by MAOs, was found to be exerted on NOS2 mRNA levels. These data offer a new insight in the control of NOS2 expression through the intracellular levels of H(2)O(2) and other reactive oxygen species (ROS). The hypothesis can be raised that the inhibition of NOS by H(2)O(2) could constitute a protective mechanism against the cytotoxic consequences of the activation of ROS-generating enzymes, thus providing a new, singular role for the MAO family of proteins.

journal_name

J Leukoc Biol

journal_title

Journal of leukocyte biology

authors

Vega A,Chacón P,Monteseirín J,El Bekay R,Alvarez M,Alba G,Conde J,Martín-Nieto J,Bedoya FJ,Pintado E,Sobrino F

doi

10.1189/jlb.1003459

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

1093-101

issue

6

eissn

0741-5400

issn

1938-3673

pii

jlb.1003459

journal_volume

75

pub_type

杂志文章

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