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Title:Influence of Rhodococcus Equi on the Respiratory Burst of Resident Alveolar Macrophages From Horses
Author(s):Brumbaugh, Gordon Wayne
Department / Program:Veterinary Medical Science
Discipline:Veterinary Medical Science
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Biology, Veterinary Science
Health Sciences, Immunology
Abstract:Rhodococcus equi is the etiologic agent of a devastating pneumonia of sporadic incidence in foals. Opsonized Rhodococcus equi are phagocytosed by equine alveolar macrophages but are ineffectively killed. The respiratory burst of equine neutrophils is obtunded by R. equi. If the bacteria similarly influence equine alveolar macrophages, that could partially explain its facultative intracellular survival.
The purpose of this study was to evaluate the influence of R. equi on the superoxide anion production, measured spectrophotometrically as the reduction of cytochrome C, and hexose monophosphate shunt activity, measured by ('14)CO(,2) liberation from ('14)C-1-D-glucose, of alveolar macrophages from horses. Alveolar macrophages were harvested from 6 anesthetized, healthy, light-breed, adult horses by bronchoalveolar lavage. Following a randomized complete block design, the suspension of cells was divided into aliquots of 10('6) viable alveolar macrophages which were exposed to 1, 10, or 100 g. of opsonized R. equi or opsonized zymosan A at 37 C for 2 hours.
The amount of superoxide anion produced by alveolar macrophages stimulated with three masses each of opsonized zymosan A and opsonized R. equi was not significantly different from that produced by unstimulated cells. The hexose monophosphate shunt activity was enhanced by both stimulants in a mass-related manner. No significant difference was found in the response produced by equal masses of either stimulant.
In this study the respiratory burst of equine alveolar macrophages was only evidenced by the hexose monophosphate shunt activity and superoxide anion was not coincidently produced. Rhodococcus equi did not adversely affect that response. The insignificant superoxide anion production by the alveolar macrophages suggests that this may not be a significant oxygen metabolite in those cells.
Further studies directed at defining the production of superoxide anion by equine alveolar macrophages should be performed. Studies of bacterial interaction with alveolar macrophages from foals should also be performed.
Issue Date:1986
Description:161 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986.
Other Identifier(s):(UMI)AAI8701443
Date Available in IDEALS:2014-12-16
Date Deposited:1986

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