Interferon-alphabeta mediates partial control of early pulmonary Mycobacterium bovis bacillus Calmette-Guérin infection.

Immunology
John KuchteyW Henry Boom

Abstract

The role of type I interferon (IFN-alphabeta) in modulating innate or adaptive immune responses against mycobacterial infection in the lung is unclear. In this study we investigated the susceptibility of IFN-alphabeta-receptor-deficient (IFN-alphabetaR-/-) mice to pulmonary infection with aerosolized Mycobacterium bovis bacillus Calmette-Guérin (BCG). During early infection (2-3 weeks), enhanced growth of BCG was measured in the lungs of IFN-alphabetaR-/- mice compared to wild-type mice. However, during late infection the burden of BCG was similar in the lungs of IFN-alphabetaR-/- and wild-type mice. Although control of BCG growth was delayed, recruitment and activation of T and natural killer cells, production of IFN-gamma, and cytokine expression were all similar in wild-type and IFN-alphabetaR-/- mice. However, decreased expression of nitric oxide in bronchoalveolar lavage fluids from IFN-alphabetaR-/- mice correlated with enhanced growth of BCG. Bone marrow-derived macrophages from IFN-alphabetaR-/- mice also produced less nitric oxide following infection with BCG in vitro. These findings suggest that IFN-alphabeta contributes to innate immunity to pulmonary mycobacterial infection by augmenting production of nitric oxide.

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Citations

Mar 21, 2013·Journal of Clinical Immunology·H I BaxE P Sampaio
Nov 28, 2007·Infection and Immunity·Mursalin M AnisW Henry Boom
Nov 13, 2014·Nature Communications·Jianxi GaoAlbert-László Barabási
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