Transforming growth factor-beta expression in human retinal pigment epithelial cells is enhanced by Toxoplasma gondii: a possible role in the immunopathogenesis of retinochoroiditis.

Abstract:

:Retinochoroiditis caused by Toxoplasma gondii infection results in inflammation and necrosis of the retina. We have used human retinal pigment epithelial cultures (HRPE) as an in vitro model to investigate the role of TGF-beta in T. gondii-induced retinochoroiditis. RT-PCR analyses showed enhanced steady state levels of TGF-beta1 and TGF-beta2 mRNA in T. gondii-infected HRPE. Uninfected HRPE secrete TGF-beta1 in a latent form while 10-30% of the secreted TGF-beta2 was in the active form. T. gondii infection induced a significant increase (P < 0.01) in total TGF-beta1 and TGF-beta2 secretion by HRPE. In addition, soluble extracts of T. gondii (ST) stimulated secretion of both TGF-beta1 and TGF-beta2 significantly (P < 0.01). Interestingly, T. gondii infection as well as ST of the parasites completely inhibited secretion of the active form of TGF-beta2. Studies evaluating the effect of TGF-beta on T. gondii replication in HRPE revealed that TGF-beta enhanced parasite replication. The interactions between host retinal cells and T. gondii may play an active role in the pathogenesis of retinochoroiditis.

journal_name

Clin Exp Immunol

authors

Nagineni CN,Detrick B,Hooks JJ

doi

10.1046/j.1365-2249.2002.01815.x

subject

Has Abstract

pub_date

2002-05-01 00:00:00

pages

372-8

issue

2

eissn

0009-9104

issn

1365-2249

pii

1815

journal_volume

128

pub_type

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