help button home button Am J Pathol ASIP MEMBERSHIP
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS

This Article
Right arrow Order Full text via Infotrieve
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Yoshino, S.
Right arrow Articles by Schwab, J. H.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Yoshino, S.
Right arrow Articles by Schwab, J. H.

American Journal of Pathology, Vol 121, 327-336, Copyright © 1985 by American Society for Investigative Pathology

REGULAR ARTICLES

Inflammation induced by bacterial cell wall fragments in the rat air pouch. Comparison of rat strains and measurement of arachidonic acid metabolites

S Yoshino, WJ Cromartie and JH Schwab

Streptococcal cell wall fragments, suspended in phosphate-buffered saline, were injected into a preformed subcutaneous air pouch in rats. The advantage of the air pouch model is the capacity for quantitation of exudative, cellular, and proliferative responses and soluble mediators. Accumulation of pouch fluid containing many leukocytes occurred during the first 3 days. Granulation tissue separable from the surrounding subcutaneous tissue developed by 6 days. Immunofluorescence and immunoperoxidase staining showed the presence of cell walls in inflammatory cells both in pouch fluid and in pouch tissue. Histologic features of this inflammation included an acute exudative phase with a predominantly neutrophil infiltration followed by a chronic phase characterized by fibroblast proliferation, formation of blood vessels, and infiltration with mononuclear cells. The lining of the pouch before injection of cell wall developed morphologic features of synovial membrane, which became more evident during the chronic phase of induced inflammation. Outbred Sprague-Dawley and inbred Lewis rats developed more pouch fluid, cell numbers in the pouch fluid, and granulation tissue than inbred Buffalo rats. The arachidonic acid metabolites, prostaglandin E2 and leukotriene B4, were measured in the pouch fluid, and more of each was produced in the Lewis than in the Buffalo strain. These measurements of inflammation are consistent with the relative susceptibility of these strains to cell-wall-induced arthritis. This model of inflammation can be used in the examination of the regulatory mechanisms of evolving chronic inflammation.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1985 by the American Society for Investigative Pathology.