Role of the polyol pathway in high glucose-induced apoptosis of retinal pericytes and proliferation of endothelial cells.

Abstract:

PURPOSE:The selective degeneration of pericytes and the proliferation of endothelial cells (ECs) appear to be associated with microaneurysm formation, an initial deficit in the early stage of diabetic retinopathy. The preventive effect of aldose reductase (AR) inhibitor (ARI) for high glucose-induced pericyte loss and EC growth was investigated. METHODS:The effect of high glucose (30 mM) exposure in the presence or absence of ARI for the cell growth of porcine pericytes and ECs was examined with the use of an in vitro coculture system to mimic the interaction between pericytes and ECs. To determine the role of transforming growth factor (TGF)-beta, its amount in culture media was measured, and the effects of the treatment of TGF-beta or neutralizing antibody on EC growth were examined. RESULTS:Abundant expression of AR and increased levels of polyol and apoptosis induced by high glucose were observed in pericytes, but not in ECs. ECs overexpressing AR cultured in high-glucose medium showed decreased cell viability. The growth-inhibitory effect of ECs on coculture with pericytes was attenuated by exposure to a high glucose concentration. Biochemical assays disclosed that the levels of active TGF-beta in media were linked to EC growth. Supply of active TGF-beta to coculture medium containing 30 mM D-glucose restored the inhibitory activity on EC growth. CONCLUSIONS:ARI rescued pericytes from high glucose-induced apoptosis and maintained the levels of TGF-beta, resulting in the prevention of cocultured EC growth.

authors

Takamura Y,Tomomatsu T,Kubo E,Tsuzuki S,Akagi Y

doi

10.1167/iovs.07-1643

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

3216-23

issue

7

eissn

0146-0404

issn

1552-5783

pii

iovs.07-1643

journal_volume

49

pub_type

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