Production of citrulline and ornithine by interferon-gamma treated macrophages.

Abstract:

:Activated macrophages exert strong arginase (ASE) activity that converts L-arginine into ornithine, the key precursor for putrescine and polyamine biosynthesis. Macrophages were previously also shown to generate nitric oxide that is derived from the guanido group of arginine by the oxidative deiminase (OAD) reaction. In view of the physiological importance of ornithine and putrescine, we now investigated whether interferon-gamma (IFN-gamma), a principal stimulator of the OAD activity, may lead to the accumulation of the deiminated derivative citrulline at the expense of ornithine production, or whether the carbon backbone could be reutilized for the production of arginine and ornithine. Our experiments show that murine peritoneal macrophages treated with IFN-gamma in combination with tumor necrosis factor (TNF) or bacterial lipopolysaccharide (LPS) generate substantial amounts of citrulline as identified by amino acid analyzer and by thin-layer chromatography. Also, labeled citrulline is generated from [14C]L-arginine but not from [14C]L-ornithine. This suggests that macrophages have little or no capacity to convert ornithine into arginine. In the absence of IFN-gamma, TNF and LPS stimulate the conversion of arginine into ornithine but not citrulline. However, when TNF or LPS stimulated macrophages are simultaneously treated with IFN-gamma, ornithine production is relatively inhibited by the strong OAD reaction that competes with the ASE reaction for its substrate L-arginine. IFN-gamma thus down-regulates the availability of ornithine and putrescine. The lipid A precursor IA also induces, in conjunction with IFN-gamma, the production of citrulline but fails to stimulate the generation of ornithine.

journal_name

Int Immunol

journal_title

International immunology

authors

Benninghoff B,Lehmann V,Eck HP,Dröge W

doi

10.1093/intimm/3.5.413

subject

Has Abstract

pub_date

1991-05-01 00:00:00

pages

413-7

issue

5

eissn

0953-8178

issn

1460-2377

journal_volume

3

pub_type

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