MicroRNA-513 Regulates B7-H1 Translation and is Involved in IFN-gamma-induced B7-H1 Expression in Cholangiocytes

Overview

Journal J Immunol

Specialty Allergy & Immunology

Date 2009 Jan 22

PMID 19155478

Citations 120

Authors

Ai-Yu Gong

Rui Zhou

Guoku Hu

Xiaoqing Li

Patrick L Splinter

Steven P OHara

Nicholas F LaRusso

Garrett A Soukup

Haidong Dong

Xian-Ming Chen

Affiliations

Soon will be listed here.

Abstract

Biliary epithelial cells (cholangiocytes) respond to proinflammatory cytokines such as IFN-gamma and actively participate in the regulation of biliary inflammatory response in the liver. B7-H1 (also known as CD274 or PD-L1) is a member of the B7 costimulatory molecules and plays a critical immunoregulatory role in cell-mediated immune responses. In this study, we show that resting human cholangiocytes in culture express B7-H1 mRNA, but not B7-H1 protein. IFN-gamma induces B7-H1 protein expression and alters the microRNA (miRNA) expression profile in cholangiocytes. Of those IFN-gamma-down-regulated miRNAs, we identified microRNA-513 (miR-513) with complementarity to the 3'-untranslated region of B7-H1 mRNA. Targeting of the B7-H1 3'-untranslated region by miR-513 results in translational repression. Transfection of cholangiocytes with an antisense oligonucleotide to miR-513 induces B7-H1 protein expression. Additionally, transfection of miR-513 precursor decreases IFN-gamma-induced B7-H1 protein expression and consequently influences B7-H1-associated apoptotic cell death in cocultured Jurkat cells. Thus, miR-513 regulates B7-H1 translation and is involved in IFN-gamma-induced B7-H1 expression in human cholangiocytes, suggesting a role for miRNA-mediated gene silencing in the regulation of cholangiocyte response to IFN-gamma.

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