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Published in: Graefe's Archive for Clinical and Experimental Ophthalmology 8/2006

01-08-2006 | Clinical Investigation

Tear fluid levels of MMP-8 are elevated in ocular rosacea—treatment effect of oral doxycycline

Authors: Marko Määttä, Osmo Kari, Taina Tervahartiala, Sirje Peltonen, Marjatta Kari, Matti Saari, Timo Sorsa

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 8/2006

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Abstract

Background

Ocular rosacea (OcR) is a chronic inflammatory disease especially affecting lid margins. Previous studies have shown that it is accompanied by increased levels and activation of tear fluid gelatinases. Matrix metalloproteinase 8 (MMP-8; collagenase 2) levels and activation are commonly elevated in many inflammatory conditions. Therefore we studied here whether MMP-8 concentration and activation in tear fluid are increased also in OcR, and if an oral doxycycline regimen could rectify the situation.

Methods

Tear fluid samples were collected from 22 OcR patients and 22 healthy controls. The OcR patients were then treated with an oral doxycycline regimen for 8 weeks and tear fluid samples collected again after 4 and 8 weeks. Conjunctival brush cytology and patients’ subjective symptoms were scored. MMP-8 concentrations in the tear fluid were assessed by immunofluorometric assay and the molecular forms and isoenzyme expression of MMP-8 were studied by Western immunoblotting.

Results

The mean MMP-8 concentration was statistically significantly higher in OcR (156.8±207.4 μg/ml) than in the normal subjects (53.5±66.7 μg/ml) (P=0.036), but decreased to 79.2±141.6 μg/l and 53.6±75.2 μg/l after 4 and 8 weeks doxycycline treatment, respectively. There was a statistically significant difference between the untreated OcR and the MMP-8 results after 4 or 8 weeks of oral doxycycline (P=0.041 and 0.069, respectively) and the OcR patients experienced statistically significant relief of their subjective symptoms (P=0.0001) after the doxycycline regimen. Both the normal and OcR tear fluid contained the larger, 60-80 kDa highly- glycosylated polymorphonuclear leukocyte-type MMP-8 isoform in Western immunoblotting, but not the 45–55 kDa less glycosylated mesenchymal-type isoform. MMP-8 activation was in practice present only in the OcR samples, and was inhibited by oral doxycycline.

Conclusions

MMP-8 concentration and activation degree in tear fluid are increased in OcR, probably reflecting increased inflammatory activity. Doxycycline effectively reduces these pathologically excessive levels and activation of MMP-8, and relieves patients’ subjective symptoms.
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Metadata
Title
Tear fluid levels of MMP-8 are elevated in ocular rosacea—treatment effect of oral doxycycline
Authors
Marko Määttä
Osmo Kari
Taina Tervahartiala
Sirje Peltonen
Marjatta Kari
Matti Saari
Timo Sorsa
Publication date
01-08-2006
Publisher
Springer-Verlag
Published in
Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 8/2006
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI
https://doi.org/10.1007/s00417-005-0212-3

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