Matrix metalloproteinase-1 is regulated in tuberculosis by a p38 MAPK-dependent, p-aminosalicylic acid-sensitive signaling cascade
Rand, Lucinda, Green, Justin A., Saraiva, Luísa, Friedland, Jon S. and Elkington, Paul T.G. (2009) Matrix metalloproteinase-1 is regulated in tuberculosis by a p38 MAPK-dependent, p-aminosalicylic acid-sensitive signaling cascade. Journal of Immunology, 182, (9), 5865-5872. (doi:10.4049/jimmunol.0801935). (PMID:19380835).
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Mycobacterium tuberculosis (M. tb) must cause lung disease to spread. Matrix metalloproteinases (MMPs) degrade the extracellular matrix and are implicated in tuberculosis-driven tissue destruction. We investigated signaling pathways regulating macrophage MMP-1 and -7 in human pulmonary tuberculosis and examine the hypothesis that the antimycobacterial drug p-aminosalicylic acid acts by inhibiting such pathways. In primary human macrophages, M. tb up-regulates gene expression and secretion of MMP-1 (interstitial collagenase) and MMP-7 (matrilysin). In tuberculosis patients, immunohistochemical analysis of lung biopsies demonstrates that p38 MAPK is phosphorylated in macrophages surrounding granulomas. In vitro, M. tb drives p38 phosphorylation. p38 inhibition suppresses M. tb-dependent MMP-1 secretion by 57.8% and concurrently increases secretion of its specific inhibitor TIMP-1 by 243.7%, demonstrating that p38 activity regulates matrix degradation by macrophages. p38 signals downstream to the cyclooxygenase 2/PGE(2) pathway. p-Aminosalicyclic acid, an agent used to treat drug-resistant tuberculosis, inhibits M. tb-driven MMP-1 but not MMP-7 gene expression and secretion. PAS acts by blocking PGE(2) production without affecting M. tb growth. In summary, p-aminosalicyclic acid decreases MMP-1 activity by inhibiting a p38 MAPK-PG signaling cascade, suggesting that this pathway is a therapeutic target to reduce inflammatory tissue destruction in tuberculosis.
|Subjects:||Q Science > QR Microbiology > QR180 Immunology
R Medicine > RC Internal medicine
|Divisions:||Faculty of Medicine
|Date Deposited:||12 Jul 2012 09:11|
|Last Modified:||31 Oct 2013 11:41|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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