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Am J Physiol Lung Cell Mol Physiol 282: L546-L555, 2002; doi:10.1152/ajplung.00175.2001
1040-0605/02 $5.00
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Vol. 282, Issue 3, L546-L555, March 2002

M. tuberculosis induction of matrix metalloproteinase-9: the role of mannose and receptor-mediated mechanisms

Carlos A. Rivera-Marrero, William Schuyler, Susanne Roser, Jeffrey D. Ritzenthaler, Sarah A. Newburn, and Jesse Roman

Pulmonary and Critical Care Division, Department of Medicine, Atlanta Veterans Affairs Medical Center and Emory University School of Medicine, Atlanta, Georgia 30033

Mycobacterium tuberculosis (Mtb) infection induces the expression of matrix metalloproteinase-9 (MMP-9) in mouse lungs. In cultured human monocytic cells, Mtb bacilli and the cell wall glycolipid lipoarabinomannan (LAM) stimulate high levels of MMP-9 activity. Here, we explore the cellular mechanisms involved in the induction of MMP-9 by Mtb. We show that infection of THP-1 cells with Mtb caused a fivefold increase in MMP-9 mRNA that was associated with increased MMP-9 activity. MMP-9 induction was dependent on microtubule polymerization and protein kinase activation and was associated with increased DNA binding by the transcription factor activator protein-1 (AP-1), which appeared to be important for MMP-9 expression. We then explored the surface molecules potentially involved in Mtb induction of MMP-9, focusing on ligands of the mannose and beta -glucan receptors. MMP-9 activity was induced by the mannose receptor ligands mannan, zymosan, and LAM, whereas the beta -glucan receptor ligand laminarin was not effective. The most active inducers of MMP-9 activity were the particulate ligand zymosan and LAM. Pretreatment of cells with an anti-mannose receptor monoclonal antibody, but not anti-complement receptor 3, decreased the induction of MMP-9 activity by Mtb bacilli. Together, these results suggest that MMP-9 induction by Mtb occurs by receptor-mediated signaling mechanisms involving the binding of mannosylated ligands to mannose receptors, the modulation by cytoskeletal elements such as microtubules, the activation of protein kinases, and transcriptional activation by AP-1.

matrix metalloproteinases; mannose receptor; protein kinases; cytoskeleton; activator protein-1; Mycobacterium


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