TNF-α and TGF-β Counter-regulate PD-L1 Expression on Monocytes in Systemic Lupus Erythematosus

Overview

Journal Sci Rep

Specialty Science

Date 2012 Mar 6

PMID 22389764

Citations 46

Authors

Jing-Ni Ou

Alice E Wiedeman

Anne M Stevens

Affiliations

Soon will be listed here.

Abstract

Monocytes in patients with systemic lupus erythematosus (SLE) are hyperstimulatory for T lymphocytes. We previously found that the normal program for expression of a negative costimulatory molecule programmed death ligand-1 (PD-L1) is defective in SLE patients with active disease. Here, we investigated the mechanism for PD-L1 dysregulation on lupus monocytes. We found that PD-L1 expression on cultured SLE monocytes correlated with TNF-α expression. Exogenous TNF-α restored PD-L1 expression on lupus monocytes. Conversely, TGF-β inversely correlated with PD-L1 in SLE and suppressed expression of PD-L1 on healthy monocytes. Therefore, PD-L1 expression in monocytes is regulated by opposing actions of TNF-α and TGF-β. As PD-L1 functions to fine tune lymphocyte activation, dysregulation of cytokines resulting in reduced expression could lead to loss of peripheral T cell tolerance.

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