Growth regulation of bovine retinal pericytes by transforming growth factor-beta2 and plasmin.

Abstract:

PURPOSE:Transforming growth factor -beta2 (TGF-beta2) is a predominant isoform of TGF-betas in the eye and plasmin is a peptidase with many functions. To better understand the pathogenesis of retinal microcirculation disorders, the effects of TGF-beta2 and plasmin on cultured bovine retinal pericytes were investigated. METHODS:Exogenous TGF-beta2 or plasmin was added to some cultures, DNA synthesis during cell cycle progression was investigated using [(3)H]thymidine incorporation. Anti-TGF-beta2 antibody was added to neutralize the effects of TGF-beta2. TGF-beta2 in the culture medium was measured using enzyme-linked immunosorbent assay (ELISA). RESULTS:Exogenous TGF-beta2 (10 pg to 100 ng/mL) suppressed DNA synthesis. Pericytes produced TGF-beta2. Anti-TGF-beta2 antibody neutralized TGF-beta2 and accelerated DNA synthesis, which shows that pericytes regulate their own cell cycle by action of the autocrine and/or paracrine system of TGF-beta2. Plasmin (0.2 to 0.5 U/mL) accelerated DNA synthesis in a dose-dependent manner, while addition of aprotinin, a protease inhibitor, counteracted this effect of plasmin. The concentration of TGF-beta2 in the culture medium decreased with the addition of plasmin. Simultaneous addition of both plasmin and anti-TGF-beta2 antibody accelerated DNA synthesis. High and low glucose concentrations of the culture medium did not affect DNA synthesis. CONCLUSIONS:Our results suggest that TGF-beta2 and plasmin respectively decrease and increase DNA synthesis. In a retinal microcirculation disorder, they may play competitive roles in the cell cycle of pericytes.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Katsura MK,Mishima HK,Minamoto A,Ishibashi F,Yamashita H

subject

Has Abstract

pub_date

2000-03-01 00:00:00

pages

166-72

issue

3

eissn

0271-3683

issn

1460-2202

journal_volume

20

pub_type

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