A2E Suppresses Regulatory Function of RPE Cells in Th1 Cell Differentiation Via Production of IL-1β and Inhibition of PGE2.

Abstract:

PURPOSE:Inflammatory status of RPE cells induced by A2E is essential in the development of AMD. Recent research indicated T-cell immunity was involved in the pathological progression of AMD. This study was designed to investigate how A2E suppresses immunoregulatory function of RPE cells in T-cell immunity in vitro. METHODS:Mouse RPE cells or human ARPE19 cells were stimulated with A2E, and co-cultured with naïve T cells under Th1, Th2, Th17, and regulatory T cell (Treg) polarization conditions. The intracellular cytokines or transcript factors of the induced T-cells subset were detected with flow cytometer and qRT-PCR. The ROS levels were detected, and the factors and possible pathways involved in the A2E-laden RPE cells were analyzed through neutralization antibody of IL-1β and inhibitors of related pathways. RESULTS:The A2E reduced regulatory function of RPE cells in Treg differentiation. The A2E-laden RPE cells promoted polarization of Th1 cells in vitro, but not Th2 or Th17 differentiation. The A2E induced RPE cells to release inflammatory cytokines and ROS, but PGE2 production was inhibited. Through neutralization of IL-1β or inhibition of COX2-PGE2 pathways, A2E-laden RPE cells expressed reduced effect in inducing Th1 cells. CONCLUSIONS:The A2E inhibited regulatory function of RPE cells in suppressing Th1 cell immunity in vitro through production of IL-1β and inhibition of PGE2. Our data indicate that A2E could suppress immunoregulatory function of RPE cells and adaptive immunity might play a role in the immune pathogenesis of AMD.

authors

Shi Q,Wang Q,Li J,Zhou X,Fan H,Wang F,Liu H,Sun X,Sun X

doi

10.1167/iovs.15-17677

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

7728-38

issue

13

eissn

0146-0404

issn

1552-5783

pii

2474985

journal_volume

56

pub_type

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