QUANTIFICATION OF HISTAMINE IN PLASMA AND PULMONARY FLUIDS FROM HORSES WITH CHRONIC OBSTRUCTIVE PULMONARY-DISEASE, BEFORE AND AFTER NATURAL (HAY AND STRAW) CHALLENGES

Bruce McGorum, Padraic Dixon, R E W Halliwell

Research output: Contribution to journalArticlepeer-review

Abstract

A commercial radioimmunoassay kit was used to quantify histamine concentrations of plasma, bronchoalveolar lavage fluid (BALF) and pulmonary epithelial lining fluid (PELF) of normal horses and horses with chronic obstructive pulmonary disease (COPD), before and after 'natural (hay and straw) challenge' (NC), There were no significant changes in the concentrations of histamine in plasma or BALF at 0.5 or 5 h after NC, but the PELF histamine concentration of COPD affected horses was significantly increased at 5 h, but not at 0.5 h, following NC. As the histamine concentrations of whole BALF lysates were significantly correlated with the numbers of metachromatically staining cells, presumed to be mast cells and/or basophils, these findings support involvement of a late phase, IgE mediated, hypersensitivity reaction in the pathogenesis of equine COPD.

Original languageEnglish
Pages (from-to)223-237
Number of pages15
JournalVeterinary Immunology and Immunopathology
Volume36
Issue number3
Publication statusPublished - Apr 1993

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