Journal
IMMUNITY
Volume 54, Issue 7, Pages 1561-+Publisher
CELL PRESS
DOI: 10.1016/j.immuni.2021.05.003
Keywords
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Categories
Funding
- NCI [P30 CA030199]
- NIH-NCI [CCSG P30 014195]
- Chapman Foundation
- Helmsley Charitable Trust
- NIH/NGMS [R01 GM102491-07]
- NIH/NCI [CCSG P30 014195, P30 CA014195-46]
- NIA/NMG [1RF1AG064049-01]
- Helmsley Trust
- Helmsley Center for Genomic Medicine
- NIH [1S10OD021815-01, K99HL148504, DK057978, HL105278, ES010337, CA014195, R01CA240909, R01 CA206483, R01HL148188]
- NCI Cancer Center Support Grant (CCSG) [P30CA23100]
- Parker Institute for Cancer Immunotherapy Bridge Scholar award
- Lustgarten Foundation
- Don and Lorraine Freeberg Foundation
- Helmholtz Young Investigator Award (Helmholtz Gemeinschaft) [VH-NG1113]
- German Research Foundation (Deutsche Forschungsgemeinschaft) [CU375/7-1]
- Melanoma Research Alliance
- Genentech Foundation fellowship
- Salk innovation grant
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The accumulation of lipids in the tumor microenvironment is associated with dysfunction of CD8(+) T cells, mediated in part by the CD36 receptor and its promotion of lipid uptake and peroxidation. Inhibiting p38 kinase or resolving lipid peroxidation may restore effector T cell functions and provide a potential therapeutic avenue for immunotherapies.
A common metabolic alteration in the tumor microenvironment (TME) is lipid accumulation, a feature associated with immune dysfunction. Here, we examined how CD8(+) tumor infiltrating lymphocytes (TILs) respond to lipids within the TME. We found elevated concentrations of several classes of lipids in the TME and accumulation of these in CD8(+) TILs. Lipid accumulation was associated with increased expression of CD36, a scavenger receptor for oxidized lipids, on CD8(+) TILs, which also correlated with progressive T cell dysfunction. Cd36(-/-) T cells retained effector functions in the TME, as compared to WT counterparts. Mechanistically, CD36 promoted uptake of oxidized low-density lipoproteins (OxLDL) into T cells, and this induced lipid peroxidation and downstream activation of p38 kinase. Inhibition of p38 restored effector T cell functions in vitro, and resolution of lipid peroxidation by overexpression of glutathione peroxidase 4 restored functionalities in CD8(+) TILs in vivo. Thus, an oxidized lipid-CD36 axis promotes intratumoral CD8(+) T cell dysfunction and serves as a therapeutic avenue for immunotherapies.
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