The mannosylated lipoarabinomanan (ManLAM) from mycobacterial species possesses strong anti-apoptotic action. Here we examined the ability of ManLAM isolated from Mycobacterium tuberculosis H37Rv to alter expression profiles of apoptosis-related genes in mouse macrophages infected with Mycobacterium bovis BCG Danish strain. ManLAM suppressed BCG-induced apoptosis and activities of caspase -1, -3, -8 and 9. Mouse Apoptosis Gene Array showed that ManLAM significantly down-regulated pro-apoptotic and proinflammatory genes: caspase -1, -3, -7, -8 and -9, TNF-α/TNFSF2, Fas/TNFRSF6, Bax-α, as well as IL-12 p35 and iNOS simultaneously up-regulating anti-apoptotic genes such as Bcl-2 and Mcl-1. The effect of ManLAM was contrary to BCG-induced up-regulation of pro-apoptotic and pro-inflammatory genes and consistent with the functional data.
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