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. 1997 Apr;65(4):1345–1350. doi: 10.1128/iai.65.4.1345-1350.1997

Expression of a long pentraxin, PTX3, by monocytes exposed to the mycobacterial cell wall component lipoarabinomannan.

V Vouret-Craviari 1, C Matteucci 1, G Peri 1, G Poli 1, M Introna 1, A Mantovani 1
PMCID: PMC175138  PMID: 9119472

Abstract

PTX3 is a prototypic long pentraxin composed of a C-terminal domain similar to those of classical pentraxins (e.g., C reactive protein) and an unrelated N-terminal portion. PTX3 is expressed in a variety of cell types, notably mononuclear phagocytes and endothelial cells, after exposure to the inflammatory cytokines interleukin-1beta (IL-1beta) and tumor necrosis factor alpha (TNF-alpha). The present study was designed to assess whether mycobacterial components were able to induce expression and production of PTX3. Mycobacterial lipoarabinomannan (LAM) induced expression of PTX3 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. Among mononuclear cells, monocytes were responsible for LAM-induced PTX3 mRNA expression. Whole mycobacteria (Mycobacterium bovis BCG) strongly induced PTX3 expression. Pretreatment with actinomycin D abolished LAM-induced PTX3 expression, whereas cycloheximide only partially reduced the expression. LAM-induced PTX3 expression was associated with the production of immunoreactive PTX3. IL-10 and IL-13 did not inhibit the induction of PTX3 by LAM. Under the same conditions, these anti-inflammatory cytokines inhibited MCP-1 expression. In contrast, gamma interferon inhibited LAM-induced PTX3 expression. Thus, in addition to IL-1, TNF, and lipopolysaccharide, mycobacterial cell wall components also induce expression and production of the long pentraxin PTX3. The significance of PTX3 in the immunobiology of mycobacterial infection and its relevance in relation to clinical involvement remain to be determined.

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Selected References

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