Fcγ receptors regulate immune activation and susceptibility during Mycobacterium tuberculosis infection

Paul J. Maglione, Jiayong Xu, Arturo Casadevall, John Chan

Research output: Contribution to journalArticlepeer-review

Abstract

The critical role of cellular immunity during tuberculosis (TB) has been extensively studied, but the impact of Abs upon this infection remains poorly defined. Previously, we demonstrated that B cells are required for optimal protection in Mycobacterium tuberculosis-infected mice. FcγR modulate immunity by engaging Igs produced by B cells. We report that C57BL/6 mice deficient in inhibitory FcγRIIB (RIIB-/-) manifested enhanced mycobacterial containment and diminished immunopathology compared with wild-type controls. These findings corresponded with enhanced pulmonary Th1 responses, evidenced by increased IFN-γ-producing CD4+ T cells, and elevated expression of MHC class II and costimulatory molecules B7-1 and B7-2 in the lungs. Upon M. tuberculosis infection and immune complex engagement, RIIB-/- macrophages produced more of the p40 component of the Th1-promoting cytokine IL-12. These data strongly suggest that FcγRIIB engagement can dampen the TB Th1 response by attenuating IL-12p40 production or activation of APCs. Conversely, C57BL/6 mice lacking the γ-chain shared by activating FcγR had enhanced susceptibility and exacerbated immunopathology upon M. tuberculosis challenge, associated with increased production of the immunosuppressive cytokine IL-10. Thus, engagement of distinct FcγR can divergently affect cytokine production and susceptibility during M. tuberculosis infection.

Original languageEnglish (US)
Pages (from-to)3329-3338
Number of pages10
JournalJournal of Immunology
Volume180
Issue number5
DOIs
StatePublished - Mar 1 2008
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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