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Tuberculosis Immunology

CD40 needed for efficient T-cell priming after M. tuberculosis exposure

Published in TB and Outbreaks Week, February 3rd, 2004

CD40 expression - but not that of its main ligand, CD40L - is needed for efficient T-cell priming during acute Mycobacterium tuberculosis infection.

In a study from the United States, "CD40(-/-) mice succumbed to low-dose aerosol infection with M. tuberculosis due to deficient IL-12 production leading to impaired priming of IFN-gamma T-cell responses."

"In contrast, CD40L(-/-) mice were resistant to M. tuberculosis," noted V. Lazarevic and coauthors working at the University of Pittsburgh.

"This asymmetry in outcome of infection between the two knockout strains is likely due to the existence of an alternative...

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