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- W2019419422 abstract "Rv3097c of Mycobacterium tuberculosis encoding lipase (LipY) was overexpressed in Mycobacterium bovis BCG. Efficacy of recombinant BCG to protect against infection of M. tuberculosis was evaluated in mice. Whereas the parent BCG vaccine protected the mice against infection, recombinant BCG overexpressing LipY offered no protection as judged by viable counts of tubercule bacilli in lungs, weight of infected mice, pathology of lungs and survival of challenged mice. Downregulation of overexpression of LipY by antisense approach considerably restored protection of infected mice as observed with parent BCG vaccine. Overexpression of lipase in BCG caused extensive hydrolysis of triacylglycerol (TG) as identified by TLC, HPLC and NMR spectroscopy. A good correlation could be inferred between hydrolysis of TG and decrease in Th1 secreted IFNγ and IL-2, proinflammatory cytokines and survival of infected mice. Mice immunized with purified LipY antigen were protected and both proinflammatory and Th1 specific cytokines were augmented. TG was found to be a poor vaccine providing no protection, which appears to be due to attenuation of Th1 and proinflammatory immune responses. In conclusion this is the first experimental report to show that immunogenicity of BCG vaccine was impaired by LipY-induced hydrolysis of specific lipids leading to suppression of host immune responses." @default.
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- W2019419422 date "2011-06-01" @default.
- W2019419422 modified "2023-09-26" @default.
- W2019419422 title "Overexpression of Rv3097c in Mycobacterium bovis BCG abolished the efficacy of BCG vaccine to protect against Mycobacterium tuberculosis infection in mice" @default.
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- W2019419422 doi "https://doi.org/10.1016/j.vaccine.2011.04.086" @default.
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