HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (7) Citing Articles via Google Scholar Google Scholar Articles by McClellan, S. A. Articles by Hazlett, L. D. Search for Related Content PubMed PubMed Citation Articles by McClellan, S. A. Articles by Hazlett, L. D.

Matrix Metalloproteinase-9 Amplifies the Immune Response to Pseudomonas aeruginosa Corneal Infection

From the Department of Anatomy/Cell Biology, Wayne State University School of Medicine, 540 East Canfield Avenue, Detroit, Michigan.

PURPOSE. The purpose of this study was to determine the role of matrix metalloproteinases (MMP) in Pseudomonas aeruginosa keratitis.

METHODS. Gene array and selective real-time PCR examined MMP expression in the cornea of susceptible (C57BL/6, B6) versus resistant (BALB/c) mice before and after infection; zymography tested enzyme activity for MMP-2 and -9. Clinical score, Langerhans cell (LC), and Neutrophil (PMN) quantitation were done in recombinant (r) MMP-9, antibody neutralized, and MMP-9^–/– mice. The chemotactic potential of MMP-9 was tested in a Boyden chamber assay; light and transmission microscopy and immunostaining for collagen IV and MMP-9 were used to examine the effects and the source of MMP-9 after infection. ELISA was used to assess IL-1ß and MIP-2 levels.

RESULTS. Gene array (confirmed by PCR) revealed sixfold more MMP-9, and zymography showed greater enzyme activity in the infected cornea of B6 over BALB/c mice. rMMP-9 injection of BALB/c mice enhanced, whereas MMP-9 antibody neutralization in B6 mice and its absence in MMP-9^–/– mice decreased corneal disease. MMP-9^–/– and antibody neutralized mice had fewer LCs in cornea; rMMP-9-treated mice had more. A myeloperoxidase (MPO) assay showed a similar pattern for PMN. MMP-9 was not chemotactic for LC or PMN. The basement membrane was more intact in MMP-9^–/– over wild-type infected mice and correlated with staining for collagen IV; PMN was a source of MMP-9. IL-1ß and MIP-2 were increased in rMMP-9 but decreased in MMP-9 antibody neutralized and MMP-9^–/– over control groups.

CONCLUSIONS. MMP-9 regulates immune function in cornea by proteolysis, potentiating P. aeruginosa keratitis by degrading collagen IV and upregulating chemotactic cytokines/chemokines IL-1ß and MIP-2.

This article has been cited by other articles:

				M. Lin, P. Jackson, A. M. Tester, E. Diaconu, C. M. Overall, J. E. Blalock, and E. Pearlman Matrix Metalloproteinase-8 Facilitates Neutrophil Migration through the Corneal Stromal Matrix by Collagen Degradation and Production of the Chemotactic Peptide Pro-Gly-Pro Am. J. Pathol., July 1, 2008; 173(1): 144 - 153. [Abstract] [Full Text] [PDF]

				G. M. Albaiceta, A. Gutierrez-Fernandez, D. Parra, A. Astudillo, E. Garcia-Prieto, F. Taboada, and A. Fueyo Lack of matrix metalloproteinase-9 worsens ventilator-induced lung injury Am J Physiol Lung Cell Mol Physiol, March 1, 2008; 294(3): L535 - L543. [Abstract] [Full Text] [PDF]

				S. Iwamoto, S.-i. Iwai, K. Tsujiyama, C. Kurahashi, K. Takeshita, M. Naoe, A. Masunaga, Y. Ogawa, K. Oguchi, and A. Miyazaki TNF-{alpha} Drives Human CD14+ Monocytes to Differentiate into CD70+ Dendritic Cells Evoking Th1 and Th17 Responses J. Immunol., August 1, 2007; 179(3): 1449 - 1457. [Abstract] [Full Text] [PDF]