Nitric oxide contributes to tissue injury in mercuric chloride-induced autoimmunity.
Recent data has suggested a role for nitric oxide (NO) both in the induction of immunity and as an effector of tissue injury in experimental models of inflammation. In this study, we have tested the efficacy of two inhibitors of NO synthase, NG-monomethyl-L-arginine (L-NMMA) and aminoguanidine (AG), to modify the autoimmune leucocytoclastic necrotizing vasculitis which develops following the administration of mercuric chloride (HgCl2) to the Brown Norway rat. Neither agent affected the induction of autoimmunity as judged by plasma IgE titres or the degree of tissue neutrophil infiltration; however, L-NMMA did significantly attenuate tissue injury scores. We conclude that inhibition of NO synthase does not influence the induction of autoimmunity by HgCl2, but that NO does contribute to the development of tissue injury in this experimental model.
Woolfson
R G
RG
Division of Renal Medicine, UCL Medical School, London, UK.
Qasim
F J
FJ
Thiru
S
S
Oliveira
D B
DB
Neild
G H
GH
Mathieson
P W
PW
D000818:Animals; D001327:Autoimmune Diseases / Q000139:chemically induced* / Q000503:physiopathology; D005260:Female; D007073:Immunoglobulin E / Q000378:metabolism; D008297:Male; D008627:Mercuric Chloride; D009504:Neutrophils / Q000473:pathology; D009569:Nitric Oxide / Q000502:physiology*; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors; D051381:Rats; D011914:Rats, Inbred BN; D013997:Time Factors; D014657:Vasculitis / Q000139:chemically induced* / Q000473:pathology
D009569:Nitric Oxide; D007073:Immunoglobulin E; D008627:Mercuric Chloride; D019001:Nitric Oxide Synthase