Mycobacterium tuberculosis up-regulates matrix metalloproteinase-1 secretion from human airway epithelial cells via a p38 MAPK switch
Elkington, Paul T.G., Emerson, Jenny E., Lopez-Pascua, Laura D. C., O'Kane, Cecilia M., Horncastle, Donna E., Boyle, Joseph J. and Friedland, Jon S. (2005) Mycobacterium tuberculosis up-regulates matrix metalloproteinase-1 secretion from human airway epithelial cells via a p38 MAPK switch. The Journal of Immunology, 175, (8), 5333-5340. (PMID:16210639).
Download
Full text not available from this repository.
Description/Abstract
Pulmonary cavitation is vital to the persistence and spread of Mycobacterium tuberculosis (MTb), but mechanisms underlying this lung destruction are poorly understood. Fibrillar type I collagen provides the lung's tensile strength, and only matrix metalloproteinases (MMPs) can degrade it at neutral pH. We investigated MTb-infected lung tissue and found that airway epithelial cells adjacent to tuberculosis (Tb) granulomas expressed a high level of MMP-1 (interstitial collagenase). Conditioned media from MTb-infected monocytes (CoMTb) up-regulated epithelial cell MMP-1 promoter activity, gene expression, and secretion, whereas direct MTb infection did not. CoMTb concurrently suppressed tissue inhibitor of metalloprotease-1 (TIMP-1) secretion, further promoting matrix degradation, and in Tb patients very low TIMP-1 expression was detected. MMP-1 up-regulation required synergy between TNF-alpha and G protein-coupled receptor signaling pathways. CoMTb stimulated p38 MAPK phosphorylation, and this is the point of TNF-alpha synergy with G protein-coupled receptor activation. Furthermore, p38 phosphorylation was the switch up-regulating MMP-1 activity and decreasing TIMP-1 secretion. Activated p38 localized to MMP-1-secreting airway epithelial cells in Tb patients. These data reveal a monocyte-epithelial cell network whereby MTb may drive tissue destruction, and they demonstrate that p38 phosphorylation is a key regulatory point in the generation of a matrix-degrading phenotype.
| Item Type: | Article |
|---|---|
| ISSNs: | 0022-1767 (print) 1550-6606 (electronic) |
| Related URLs: | |
| Subjects: | Q Science > QR Microbiology > QR180 Immunology Q Science > QR Microbiology > QR355 Virology |
| Divisions: | Faculty of Medicine |
| Item ID: | 341070 |
| Date Deposited: | 12 Jul 2012 12:55 |
| Last Modified: | 12 Jul 2012 12:55 |
| Contributors: | Elkington, Paul T.G. (Author) Emerson, Jenny E. (Author) Lopez-Pascua, Laura D. C. (Author) O'Kane, Cecilia M. (Author) Horncastle, Donna E. (Author) Boyle, Joseph J. (Author) Friedland, Jon S. (Author) |
| Date: | 15 October 2005 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/341070 |
Actions (login required)
 |
View Item |
