Analysis of the Secretion Pattern of Monocyte Chemotactic Protein-1 (MCP-1) and Transforming Growth Factor-beta 2 (TGF-beta2) by Human Retinal Pigment Epithelial Cells

Overview

Journal Clin Exp Immunol

Publisher Oxford University Press

Specialty Allergy & Immunology

Date 1999 Oct 30

PMID 10540157

Citations 24

Authors

G M Holtkamp

A F de Vos

R Peek

A Kijlsta

Affiliations

Soon will be listed here.

Abstract

Retinal pigment epithelial (RPE) cells, situated between the neurosensory retina and the vascularized choroid, form part of the blood-eye barrier and are important for homeostasis of the outer retina. These cells are able to produce a variety of cytokines which may play a role in the maintenance of the immunosuppressive milieu inside the eye and in intraocular inflammatory responses. In the present study, we investigated whether RPE cells secreted the anti-inflammatory cytokine TGF-beta2 and the proinflammatory cytokine MCP-1 in a polarized manner. Monolayers of human donor RPE cells were cultured on transwell filters. Secretion of TGF-beta2 and MCP-1 at either the apical or basal side of the RPE cell monolayers, that were not treated or stimulated with IL-1beta (200 U/ml), was analysed by ELISA. All three cell lines examined had a different TGF-beta2 secretion pattern. In two of the three donor RPE cell lines tested, TGF-beta2 secretion was polarized, but not in the same direction. TGF-beta2 secretion was not up-regulated by stimulation with IL-1beta. In contrast, IL-1beta strongly induced MCP-1 secretion preferentially into the basal compartment of all RPE monolayers tested. These data indicate that human RPE cells are able to secrete TGF-beta2 and MCP-1 in a polarized fashion. Our results suggest that MCP-1 can be secreted by RPE cells in the direction of choroidal vessels during inflammatory responses in the posterior part of the eye, which may limit damage to the neurosensory retina.

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