Early Antibody-Mediated Immunity to Tuberculosis in Mice Requires NLRP3.

ABSTRACT: While antibodies have emerged as potential mediators of protective immunity against Mycobacterium tuberculosis (Mtb), their mechanisms of action remain incompletely understood. Here, we demonstrate that immune complexes of Mtb and monoclonal antibodies targeting the Mtb phosphate transporter subunit PstS1 robustly activate the NLRP3 inflammasome in human and murine macrophages, leading to enhanced interleukin-1β secretion. Surprisingly, antibody-mediated inflammasome activation occurred independently of cell-surface Fcγ receptors, as confirmed using Fc-domain glycosylation mutant mAbs and macrophages from Fcγ receptor-deficient mice. Crucially, NLRP3 is indispensable for early antibody-mediated protection in vivo, as both pharmacological inhibition, and genetic deletion of NLRP3 com

SUBMITTER: Bouzeyen R 

PROVIDER: S-EPMC12312167 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature