Expression of monocyte chemotactic protein-3 in human monocytes exposed to the mycobacterial cell wall component lipoarabinomannan

Cytokine
V Vouret-CraviariA Mantovani

Abstract

Monocyte chemotactic protein-3 (MCP-3) is a C-C chemokine which interacts with the CCR1, CCR2 (MCP-1) and CCR3 receptors and has a distinct spectrum of action. The present study was designed to assess whether mycobacterial components were able to induce expression and production of MCP-3 in human monocytes. Mycobacterial lipoarabinomannan (LAM) induced expression of MCP-3 mRNA in human peripheral blood mononuclear cells. The non-mannose-capped version of lipoarabinomannan (AraLAM) was considerably more potent than the mannose-capped version ManLAM or the simpler version phosphatidylinositol mannoside (PLM). Among mononuclear cells, monocytes were responsible for LAM-induced MCP-3 mRNA expression. Whole mycobacteria (Mycobacterium bovis BCG) strongly induced MCP-3 expression. Pretreatment with actinomycin D abolished LAM-induced MCP-3 expression, whereas cycloheximide only partially reduced the expression. LAM-induced MCP-3 expression was associated with the production of immunoreactive PTX3. Interleukin 10 (IL-10) and IL-13 inhibited the induction of MCP-3 by LAM. Thus mycobacterial cell wall components induced expression of MCP-3 in human monocytes. MCP-3, a chemokine active on mononuclear phagocytes, NK cells, T cells and den...Continue Reading

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