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Mycobacterium tuberculosis-induced macrophage apoptosis can be inhibited by mannosylated lipoarabinomannan (ManLAM), although it induces tumor necrosis factor (TNF)-alpha and NO production, which participate in apoptosis induction. ManLAM also modulates Ca(+2)-dependent intracellular events, and Ca(+2) participates in apoptosis in different systems. Ca(+2) was assessed for involvement in M. tuberculosis-induced macrophage apoptosis and for modulation by ManLAM. The role of Ca(+2) was supported by the blockade of apoptosis by cAMP inhibitors and the Ca(+2) chelator, BAPTA/AM. These agents also inhibited caspase-1 activation and cAMP-responsive element-binding protein translocation without affecting TNF-alpha production. Infection of macrophages with M. tuberculosis induced an influx of Ca(+2) that was prevented by ManLAM. Similarly, M. tuberculosis infection-altered mitochondrial permeability transition was prevented by ManLAM and BAPTA/AM. Finally, ManLAM and BAPTA/AM reversed the effects of M. tuberculosis on p53 and Bcl-2 expression. ManLAM counteracts the alterations of calcium-dependent intracellular events that occur during M. tuberculosis-induced macrophage apoptosis.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Mannosylated Lipoarabinomannan Antagonizes<i>Mycobacterium tuberculosis–</i>Induced Macrophage Apoptosis by Altering Ca<sup>+2</sup>‐Dependent Cell Signaling

Mannosylated Lipoarabinomannan AntagonizesMycobacterium tuberculosis–Induced Macrophage Apoptosis by Altering Ca+2‐Dependent Cell Signaling

Mannosylated Lipoarabinomannan AntagonizesMycobacterium tuberculosis–Induced Macrophage Apoptosis by Altering Ca⁺²‐Dependent Cell Signaling