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HOST-PARASITE RELATIONSHIPS IN EXPERIMENTAL PNEUMONIA DUE TO PNEUMOCOCCUS TYPE III
Experimental pneumonia was produced with a highly virulent strain of type III pneumococcus which synthesizes, during rapid growth, large amounts of capsular polysaccharide. The type III pneumonia differed from that caused by pneumococcus I in that (a) death occurred more promptly in the type III inf...
Autores principales: | , |
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Formato: | Texto |
Lenguaje: | English |
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The Rockefeller University Press
1950
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2136019/ https://www.ncbi.nlm.nih.gov/pubmed/15422100 |
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author | Wood, W. Barry Smith, Mary Ruth |
author_facet | Wood, W. Barry Smith, Mary Ruth |
author_sort | Wood, W. Barry |
collection | PubMed |
description | Experimental pneumonia was produced with a highly virulent strain of type III pneumococcus which synthesizes, during rapid growth, large amounts of capsular polysaccharide. The type III pneumonia differed from that caused by pneumococcus I in that (a) death occurred more promptly in the type III infection, (b) the local pulmonary lesion became more heavily infected, and (c) frank suppuration was common even after otherwise effective chemotherapy. The greater pathogenicity of the type III organism was shown by special histologic techniques to be due primarily to its capsular slime layer which interferes with surface phagocytosis. Capsular polysaccharide shed from the organism during growth was also demonstrated in high concentration in certain parts of the pneumonic lesion. Removal of the excess polysaccharide from the alveoli resulted from (a) lymphatic drainage to regional lymph nodes and (b) phagocytosis, particularly by macrophages. The possible relationship of the free carbohydrate to the malignancy and the characteristically viscous exudate of type III pneumonia was discussed. The lung abscesses which resulted from type III infection were observed to occur in those areas in which the maximum number of organisms had accumulated. Evidence was obtained that suppuration was due, not to necrotoxic products peculiar to the type III pneumococcus, but rather to the survival of large numbers of bacteria in the tissues, brought about primarily by the antiphagocytic effect of the slime layer. When pneumonia was produced with an intermediate type III mutant lacking the protective slime layer, back mutation to the mucoid parent occurred during the course of the infection, and the mucoid form eventually predominated in the lung as a result of selective phagocytosis of the intermediate organisms. Similar mutation to the maximally virulent type III form was noted with a transformed intermediate type III strain grown from single cell preparations. |
format | Text |
id | pubmed-2136019 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1950 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-21360192008-04-17 HOST-PARASITE RELATIONSHIPS IN EXPERIMENTAL PNEUMONIA DUE TO PNEUMOCOCCUS TYPE III Wood, W. Barry Smith, Mary Ruth J Exp Med Article Experimental pneumonia was produced with a highly virulent strain of type III pneumococcus which synthesizes, during rapid growth, large amounts of capsular polysaccharide. The type III pneumonia differed from that caused by pneumococcus I in that (a) death occurred more promptly in the type III infection, (b) the local pulmonary lesion became more heavily infected, and (c) frank suppuration was common even after otherwise effective chemotherapy. The greater pathogenicity of the type III organism was shown by special histologic techniques to be due primarily to its capsular slime layer which interferes with surface phagocytosis. Capsular polysaccharide shed from the organism during growth was also demonstrated in high concentration in certain parts of the pneumonic lesion. Removal of the excess polysaccharide from the alveoli resulted from (a) lymphatic drainage to regional lymph nodes and (b) phagocytosis, particularly by macrophages. The possible relationship of the free carbohydrate to the malignancy and the characteristically viscous exudate of type III pneumonia was discussed. The lung abscesses which resulted from type III infection were observed to occur in those areas in which the maximum number of organisms had accumulated. Evidence was obtained that suppuration was due, not to necrotoxic products peculiar to the type III pneumococcus, but rather to the survival of large numbers of bacteria in the tissues, brought about primarily by the antiphagocytic effect of the slime layer. When pneumonia was produced with an intermediate type III mutant lacking the protective slime layer, back mutation to the mucoid parent occurred during the course of the infection, and the mucoid form eventually predominated in the lung as a result of selective phagocytosis of the intermediate organisms. Similar mutation to the maximally virulent type III form was noted with a transformed intermediate type III strain grown from single cell preparations. The Rockefeller University Press 1950-07-01 /pmc/articles/PMC2136019/ /pubmed/15422100 Text en Copyright © Copyright, 1950, by The Rockefeller Institute for Medical Research New York This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/). |
spellingShingle | Article Wood, W. Barry Smith, Mary Ruth HOST-PARASITE RELATIONSHIPS IN EXPERIMENTAL PNEUMONIA DUE TO PNEUMOCOCCUS TYPE III |
title | HOST-PARASITE RELATIONSHIPS IN EXPERIMENTAL PNEUMONIA DUE TO PNEUMOCOCCUS TYPE III |
title_full | HOST-PARASITE RELATIONSHIPS IN EXPERIMENTAL PNEUMONIA DUE TO PNEUMOCOCCUS TYPE III |
title_fullStr | HOST-PARASITE RELATIONSHIPS IN EXPERIMENTAL PNEUMONIA DUE TO PNEUMOCOCCUS TYPE III |
title_full_unstemmed | HOST-PARASITE RELATIONSHIPS IN EXPERIMENTAL PNEUMONIA DUE TO PNEUMOCOCCUS TYPE III |
title_short | HOST-PARASITE RELATIONSHIPS IN EXPERIMENTAL PNEUMONIA DUE TO PNEUMOCOCCUS TYPE III |
title_sort | host-parasite relationships in experimental pneumonia due to pneumococcus type iii |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2136019/ https://www.ncbi.nlm.nih.gov/pubmed/15422100 |
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