Linked Life Data

21440050

Source:http://linkedlifedata.com/resource/pubmed/id/21440050

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pubmed-article:21440050pubmed:abstractTextTo assess the role of mannosylated lipoarabinomannan (ManLAM) in the inflammatory and apoptotic response of mycobacteria-infected and uninfected, bystander cells we applied a mouse macrophage model of infection with avirulent strains--Mycobacterium bovis BCG, Mycobacterium tuberculosis (MTB) H37Ra and compared with a virulent MTB H37Rv strain infection. ManLAM contributed to the infection of macrophages by protection from apoptosis with stabilized Bcl-2 expression and down-regulated Bax expression for infected cells (BCG) or with stabilized Bcl-2 expression for uninfected bystander target cells (H37Ra). Additionally, ManLAM up-regulated FasL expression on the infected cells. Active extracellular signal-regulated kinase (ERK1/2) in BCG and H37Rv infection provided an anti-apoptotic effect by stabilization of anti-apoptotic Bcl-2 expression in the infected cells. Inhibitors specific for c-Jun-NH2-terminal kinase or stress-activated kinase (JNK) and p38 kinase decreased apoptosis of infected cells (BCG, H37Ra) and of uninfected bystanders (H37Ra) by down-regulating Bax. ManLAM significantly down-regulated production of pro-inflammatory IL-12 and TNF-alpha and activation of JNK by both avirulent strains. We conclude that by stabilization of Bcl-2 expression, down-regulation of JNK activity and down-regulation of pro-inflammatory cytokines production ManLAM can contribute to suppression of apoptosis and inflammatory reaction of uninfected, bystander cells.lld:pubmed
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pubmed-article:21440050pubmed:copyrightInfoCopyright © 2011 Elsevier Ltd. All rights reserved.lld:pubmed
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pubmed-article:21440050pubmed:volume51lld:pubmed
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pubmed-article:21440050pubmed:articleTitleMannosylated lipoarabinomannan balances apoptosis and inflammatory state in mycobacteria-infected and uninfected bystander macrophages.lld:pubmed
pubmed-article:21440050pubmed:affiliationDivision of Immunology, Department of Preclinical Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, Ciszewskiego 8, 02-786 Warsaw, Poland.lld:pubmed
pubmed-article:21440050pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:21440050pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed