Vacuolar-ATPase inhibitors are antimicrobial agents active against intracellular mycobacteria.

ABSTRACT: Mycobacterium tuberculosis (Mtb) evades host defenses by inhibiting phagosome acidification in part through the secreted phosphatase PtpA, binding to the vacuolar ATPase (v-ATPase), and disrupting downstream cellular events. We investigated the antimicrobial effects of three v-ATPase inhibitors, Bafilomycin A1 (BafA1), Bafilomycin D, and Cladoniamide B (ClaB), on the growth of Mtb, M. abscessus (Mabs), and M. bovis BCG in THP-1 and murine infection models. We found potent inhibition of intracellular growth with MIC₅₀ in the nanomolar range, with compounds showing a bacteriostatic inhibition of Mtb growth in THP-1 macrophages. Axenic bacteria were not affected by 2 µM compound in broth, although lysate from macrophages incubated with ClaB resulted in a 50% re

SUBMITTER: Rankine-Wilson L 

PROVIDER: S-EPMC12691628 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature