Thrombospondin-1 is produced by retinal glial cells and inhibits the growth of vascular endothelial cells.

Abstract:

BACKGROUND/AIMS:By the release of antiangiogenic factors, Müller glial cells provide an angiostatic environment in the normal and ischemic retina. We determined whether Müller cells produce thrombospondin-1 (TSP-1), a known inhibitor of angiogenesis. METHODS:Secretion of TSP-1 by cultured Müller cells was determined with ELISA. Slices of rat retinas and surgically excised retinal membranes of human subjects were immunostained against TSP-1 and the glial marker vimentin. The effects of TSP-1 on the growth of bovine retinal endothelial cells (BRECs) and activation of ERK1/2 were determined with DNA synthesis and migration assays, and Western blotting, respectively. RESULTS:Cultured Müller cells secrete TSP-1 under normoxic and hypoxic (0.2% O2) conditions. Secretion of TSP-1 was increased in hypoxia compared to normoxia. In rat retinal slices, glial, retinal ganglion, and possibly horizontal cells were stained for TSP-1. Retinal glial cells in preretinal membranes from human subjects with nonhypoxic epiretinal gliosis (macular pucker) and proliferative diabetic retinopathy, respectively, were immunopositive for TSP-1. Exogenous TSP-1 reduced the VEGF-induced proliferation and migration of BRECs and decreased the phosphorylation level of ERK1/2 in BRECs. CONCLUSION:The data suggest that Müller cells are one major source of TSP-1 in the normal and ischemic retina. Glia-derived TSP1 may inhibit angiogenic responses in the ischemic retina.

journal_name

Ophthalmic Res

journal_title

Ophthalmic research

authors

Yafai Y,Eichler W,Iandiev I,Unterlauft JD,Jochmann C,Wiedemann P,Bringmann A

doi

10.1159/000362371

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

81-8

issue

2

eissn

0030-3747

issn

1423-0259

pii

000362371

journal_volume

52

pub_type

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