Skip Navigation LinksHome > July 2007 - Volume 26 - Issue 6 > Regulation of Membrane-Associated Mucins in the Human Cornea...
doi: 10.1097/ICO.0b013e31804f5a09
Basic Investigation

Regulation of Membrane-Associated Mucins in the Human Corneal Epithelial Cells by Dexamethasone

Seo, Kyoung Yul MD, PhD; Chung, So-Hyang MD; Lee, Joon H PhD; Park, Mi Young MS; Kim, Eung Kweon MD, PhD

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Purpose: To study the influence of dexamethasone on membrane-associated mucins produced by human corneal epithelial cells.

Methods: Human corneal epithelial cells were cultured in medium supplemented with various concentrations of dexamethasone (ranging from 10−8 to 10−6 M). Reverse transcription-polymerase chain reaction (RT-PCR) and Western blot analysis using monoclonal antibodies specific for human MUC1 (HMFG-1), MUC4 (1G8), and MUC16 (OC125) were performed to evaluate the effect of dexamethasone on membrane-associated mucin expression. The effect of glucocorticoid receptor antagonist (RU38486) on dexamethasone-induced mucin expression was estimated.

Results: RT-PCR revealed that MUC1 and MUC16 gene expression were upregulated 48 hours after addition of dexamethasone and that MUC4 gene expression was downregulated in the same condition. Western blot analysis showed that MUC1 and MUC16 proteins were increased after addition of dexamethasone. However, MUC4 was not detected by anti-MUC4 monoclonal antibody (1G8) for ASGP-2 under our conditions. Treatment with RU38486 inhibited the changes of MUC1, MUC4, and MUC16 by dexamethasone; thus, the effect of dexamethasone on mucin expression is mediated by glucocorticoid receptors.

Conclusions: This study shows that MUC1, MUC4, and MUC16 are regulated differently by dexamethasone in human corneal epithelial cells. External application of dexamethasone might affect the precorneal mucin.

Copyright © 2007 Wolters Kluwer Health, Inc. All rights reserved.


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