The Gills Are an Important Site of INOS Expression in Rainbow Trout Oncorhynchus Mykiss After Challenge with the Gram-positive Pathogen Renibacterium Salmoninarum

Overview

Journal Immunology

Specialty Allergy & Immunology

Date 2000 Jan 29

PMID 10651954

Citations 25

Authors

M Ward

P S Grabowski

A E Ellis

C J Secombes

Affiliations

Soon will be listed here.

Abstract

Following injection challenge of rainbow trout with the Gram-positive pathogen Renibacterium salmoninarum, serum nitrate levels increased indicative of NO production. The timing and amount of nitrate produced varied with the virulence of the bacterial strain used, with the highest levels seen in fish challenged with the most virulent (autoaggregating) strain. Immunization with a killed R. salmoninarum preparation in Freund's incomplete adjuvant significantly increased nitrate levels after challenge. Inducible nitric oxide synthase (iNOS) transcript expression was detectable in rainbow trout tissues after injection challenge with R. salmoninarum, and its induction in the gills was both quick (between 3 and 6 hr) and relatively prolonged (lasting several days). iNOS expression in the kidney was also seen at a later stage (24 hr) but appeared to switch off relatively rapidly. Bath challenge with R. salmoninarum also induced iNOS expression in gill, and a variable expression in the gut and kidney also occurred. These results highlight the importance of the gills, not only as a point of entry of pathogens but also as a tissue capable of mounting an immune response.

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