title: Inducible nitric oxide synthase and nitrotyrosine in listeric encephalitis: a cross-species study in ruminants.
abstract: Listeria monocytogenes (LM) is a Gram-positive facultative intracellular bacterium that causes fatal meningoencephalitis in humans and ruminants. A current paradigm predicts that intracellular bacteria are controlled by nitric oxide (NO) whose synthesis is catalyzed by inducible nitric oxide synthase (iNOS). The ability of macrophages (Mphi) to express iNOS shows extreme interspecies variability. Here the expression of iNOS and synthesis of NO was studied in listeric encephalitis of cattle, sheep, and goats. iNOS was expressed by a subset of Mphi in cerebral microabscesses in all three species. The level of iNOS expression and the density of cells per lesion expressing iNOS was highest in cattle, intermediate in sheep, and lowest in goats. The accumulation of nitrotyrosine (NT), an indicator of local NO synthesis, was observed in lesions of cattle but not in those of small ruminants. The density of iNOS-expressing cells in lesions was inversely correlated with the number of bacteria. No species differences were observed in regard to reactive oxygen intermediate (ROI) production by stimulated granulocytes, using the flow cytometric dihydrorhodamine-123 (DHR) method indicating ROI generation. Thus, the marked species differences in iNOS expression, NT accumulation, and LM content in lesions of ruminants with listeric encephalitis are explained by different amounts of ROI produced. It suggests that variations in the ability of Mphi to synthesize NO are of pathophysiological significance in listeriosis.
authors: Institutes of Veterinary Virology, University of Berne, Switzerland.
authors: H
authors: H
authors: Pfister
authors: K A
authors: KA
authors: Remer
authors: M
authors: M
authors: Brcic
authors: R
authors: R
authors: Fatzer
authors: S
authors: S
authors: Christen
authors: S
authors: S
authors: Leib
authors: T W
authors: TW
authors: Jungi
mesh_terms: D000818:Animals; D001921:Brain / Q000201:enzymology / Q000382:microbiology* / Q000473:pathology; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology; D015169:Colony Count, Microbial / Q000662:veterinary; D004660:Encephalitis / Q000201:enzymology / Q000382:microbiology / Q000662:veterinary*; D015511:Goat Diseases / Q000382:microbiology; D006041:Goats; D007150:Immunohistochemistry / Q000662:veterinary; D008089:Listeria monocytogenes / Q000254:growth & development / Q000378:metabolism; D008088:Listeriosis / Q000201:enzymology / Q000473:pathology / Q000662:veterinary*; D008262:Macrophage Activation; D008264:Macrophages / Q000201:enzymology / Q000378:metabolism; D009569:Nitric Oxide / Q000096:biosynthesis; D019001:Nitric Oxide Synthase / Q000378:metabolism*; D052247:Nitric Oxide Synthase Type II; D017382:Reactive Oxygen Species / Q000378:metabolism; D012189:Retrospective Studies; D012418:Ruminants; D012756:Sheep; D012757:Sheep Diseases / Q000382:microbiology; D013045:Species Specificity; D014443:Tyrosine / Q000031:analogs & derivatives* / Q000378:metabolism*
chemical_list: D017382:Reactive Oxygen Species; D009569:Nitric Oxide; C002744:3-nitrotyrosine; D014443:Tyrosine; D019001:Nitric Oxide Synthase; D052247:Nitric Oxide Synthase Type II