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. 1990 Feb;87(3):973–977. doi: 10.1073/pnas.87.3.973

Suppression of T-cell proliferation by Mycobacterium leprae and its products: the role of lipopolysaccharide.

A Molloy 1, G Gaudernack 1, W R Levis 1, Z A Cohn 1, G Kaplan 1
PMCID: PMC53392  PMID: 1689064

Abstract

Addition of soluble molecules obtained from sonicated Mycobacterium leprae markedly suppressed the proliferative response to the mitogen anti-CD3 of peripheral blood mononuclear cells and isolated T cells. Suppression was nonspecific and occurred with cells from lepromatous and tuberculoid leprosy patients as well as control donors. The purified lipoarabinomannans from M. leprae and Mycobacterium tuberculosis had a similar spectrum of inhibition whereas their deacylated derivatives were without effect. All mycobacterial preparations of either a crude or purified state, which suppressed cellular responses, contained appreciable quantities of bacterial lipopolysaccharide by the Limulus amebocyte assay. Contamination with lipopolysaccharide could account for the extent and nonselectivity of the T-cell suppression. Suppression was also monocyte-dependent and in part due to the release of arachidonate metabolites of the cyclooxygenase pathway.

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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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