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. 1979 Apr;24(1):59–64. doi: 10.1128/iai.24.1.59-64.1979

Effects of BCG infection on the susceptibility of mouse macrophages to endotoxin.

D L Peavy, R E Baughn, D M Musher, D M Musher
PMCID: PMC414261  PMID: 378847

Abstract

Mice infected intravenously with Mycobacterium bovis (BCG) are 100 to 1,000 times more sensitive to the lethal effects of bacterial lipopolysaccharides (LPS). Since BCG infection results in macrophage activation and LPS may cause pathophysiological effects through interaction with this cell type, it was of interest to determine whether macrophages from BCG-infected animals were more susceptible to the toxic effects of LPS in vitro. When LPS-susceptible, C57BL/6 mice were infected with BCG, a significant reduction in the 50% lethal dose of LPS was first observed after 7 days and persisted for several weeks. Macrophages from these animals had greatly increased susceptibility to LPS in vitro, which correlated with the development of acquired cellular resistance as determined by their ability to inhibit the growth of Listeria monocytogenes. In contrast, BCG infection of C3H/HeJ mice, a strain resistant to LPS, did not alter the 50% lethal dose of LPS for these animals or increase the sensitivity of their peritoneal macrophages to LPS in vitro. These results indicate that susceptibility of BCG-infected mice to the lethal effects of LPS parallels the susceptibility of their macrophages in vitro; release of vasoactive substances from LPS-susceptible activated macrophages in vivo may be, in part, responsible for lethality.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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