Cytotoxic effect of autocrine and macrophage-derived nitric oxide on cultured rat mesangial cells.

Abstract:

:Expression of the inducible form of nitric oxide synthase (iNOS) has been found to be up-regulated in cytokine-stimulated mesangial cells (MC) and in experimental glomerulonephritis. Since direct toxicity of nitric oxide (NO) has been implicated in damage of bacteria, neoplastic and intact pancreatic cells, we investigated whether NO is cytotoxic to cultured MC, which may be relevant to pathogenesis of glomerular injury. MC isolated from rat glomeruli generated substantial amounts of nitrite, the stable NO end-product, when cells were stimulated with IL-1beta and tumour necrosis factor-alpha (TNF-alpha). Total DNA synthesis was significantly reduced in the presence of IL-1beta and TNF-alpha, and this effect was completely reversed by N(G)-monomethyl-L-arginine (L-NMMA), an inhibitor of iNOS. Stimulation of MC with IL-1beta and TNF-alpha caused remarkable toxicity to these cells, measured by the MTT test (3-(4,5-dimethylthiazol-2-yl)2,5-diphenyl tetrazolium bromide cleavage, specific cytotoxicity 41.5 +/- 20.3%), and much less prominent MC lysis (3H-thymidine release, specific cytolysis 11.5 +/- 5.3%). Toxic effects of cytokines were fully reversible by the iNOS inhibitor. Lipopolysaccharide (LPS) and interferon-gamma (IFN-gamma), but not IL-1beta and TNF-alpha, induced rat peritoneal macrophages to produce large amounts of nitrite. In co-culture, such prestimulated macrophages had significantly cytotoxic (MTT test 62.9 +/- 19.9%) and cytolytic (3H-thymidine release 57.9 +/- 13.8%) effects on MC. Again, this toxicity was totally inhibited in the presence of L-NMMA. We conclude from these results that cytokine-stimulated generation of NO by MC or macrophages is directly toxic to MC, and may play a role in pathogenesis of glomerular injury involving mesangiolysis.

journal_name

Clin Exp Immunol

authors

Hruby Z,Beck KF

doi

10.1046/j.1365-2249.1997.d01-906.x

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

76-82

issue

1

eissn

0009-9104

issn

1365-2249

journal_volume

107

pub_type

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