@article{b3d010de4c2e4d2380e9f9257273c92e,
title = "Glycosylation and stabilization of programmed death ligand-1 suppresses T-cell activity",
abstract = "Extracellular interaction between programmed death ligand-1 (PD-L1) and programmed cell death protein-1 (PD-1) leads to tumour-associated immune escape. Here we show that the immunosuppression activity of PD-L1 is stringently modulated by ubiquitination and N-glycosylation. We show that glycogen synthase kinase 3β (GSK3β) interacts with PD-L1 and induces phosphorylation-dependent proteasome degradation of PD-L1 by β-TrCP. In-depth analysis of PD-L1 N192, N200 and N219 glycosylation suggests that glycosylation antagonizes GSK3β binding. In this regard, only non-glycosylated PD-L1 forms a complex with GSK3β and β-TrCP. We also demonstrate that epidermal growth factor (EGF) stabilizes PD-L1 via GSK3β inactivation in basal-like breast cancer. Inhibition of EGF signalling by gefitinib destabilizes PD-L1, enhances antitumour T-cell immunity and therapeutic efficacy of PD-1 blockade in syngeneic mouse models. Together, our results link ubiquitination and glycosylation pathways to the stringent regulation of PD-L1, which could lead to potential therapeutic strategies to enhance cancer immune therapy efficacy.",
author = "Li, {Chia Wei} and Lim, {Seung Oe} and Weiya Xia and Lee, {Heng Huan} and Chan, {Li Chuan} and Kuo, {Chu Wei} and Khoo, {Kay Hooi} and Chang, {Shih Shin} and Cha, {Jong Ho} and Taewan Kim and Hsu, {Jennifer L.} and Yun Wu and Hsu, {Jung Mao} and Hirohito Yamaguchi and Qingqing Ding and Yan Wang and Jun Yao and Lee, {Cheng Chung} and Wu, {Hsing Ju} and Sahin, {Aysegul A.} and Allison, {James P.} and Dihua Yu and Hortobagyi, {Gabriel N.} and Hung, {Mien Chie}",
note = "Funding Information: This work was funded in part by the following: National Institutes of Health (grants R01 CA109311, PO1 CA099031 and CCSG CA016672); National Breast Cancer Foundation Inc., Breast Cancer Research Foundation (to M.-C.H. and G.N.H.); Patel Memorial Breast Cancer Endowment Fund; The University of Texas MD Anderson-China Medical University and Hospital Sister Institution Fund (to M.-C.H.); Ministry of Science and Technology, International Research-intensive Centers of Excellence in Taiwan (I-RiCE; MOST105-2911-I-002-302); Ministry of Health and Welfare, China Medical University Hospital Cancer Research Center of Excellence (MOHW105-TDU-B-212-134003); Center for Biological Pathways; Susan G. Komen for the Cure Postdoctoral Fellowship (PDF12231298 to S.-O.L.); Basic Science Research Program through the National Research Foundation of Korea funded by the Korea government (MSIP; NRF-2011-357-C00140 to S.-O.L.); the National Research Foundation of Korea (NRF) grant for the Global Core Research Center (GCRC) funded by the Korea government (MSIP; 2011-0030001 to J.-H.C.). Publisher Copyright: {\textcopyright} 2016 The Author(s).",
year = "2016",
month = aug,
day = "30",
doi = "10.1038/ncomms12632",
language = "English",
volume = "7",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
}