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Dexamethasone increases pigment epithelium-derived factor in perfused human eyes
Elizabeth M Perruccio1, Laura Leigh S Rowlette, Nuria Comes
1Section of Protein Structure and Function, Laboratory of Retinal Cell and Molecular Biology, National Eye Institute, NIH, Bethesda, Maryland, USA.
Purpose:
To investigate the effects of dexamethasone (DEX) on pigment epithelium-derived factor (PEDF) cDNA and secreted protein in human trabecular meshwork (TM).
Methods:
Anterior segment organ cultures were perfused with 0.1 microM DEX (OD) and vehicle (OS). Primary human TM cells (HTM) were treated with DEX under similar conditions. PEDF mRNA and secreted PEDF protein were quantitated by RT-PCR and Western blot.
Results:
PEDF mRNA and secreted PEDF protein levels were significantly higher in DEX over vehicle-treated cultures. In contrast, DEX decreased the activity of a 92-kDa gelatinolytic zymogen in organ culture effluents.
Conclusion:
DEX action in the human TM might include a PEDF-mediating pathway.
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