Abstract:
:The metabolic challenges present in tumors attenuate the metabolic fitness and antitumor activity of tumor-infiltrating T lymphocytes (TILs). However, it remains unclear whether persistent metabolic insufficiency can imprint permanent T cell dysfunction. We found that TILs accumulated depolarized mitochondria as a result of decreased mitophagy activity and displayed functional, transcriptomic and epigenetic characteristics of terminally exhausted T cells. Mechanistically, reduced mitochondrial fitness in TILs was induced by the coordination of T cell receptor stimulation, microenvironmental stressors and PD-1 signaling. Enforced accumulation of depolarized mitochondria with pharmacological inhibitors induced epigenetic reprogramming toward terminal exhaustion, indicating that mitochondrial deregulation caused T cell exhaustion. Furthermore, supplementation with nicotinamide riboside enhanced T cell mitochondrial fitness and improved responsiveness to anti-PD-1 treatment. Together, our results reveal insights into how mitochondrial dynamics and quality orchestrate T cell antitumor responses and commitment to the exhaustion program.
journal_name
Nat Immunoljournal_title
Nature immunologyauthors
Yu YR,Imrichova H,Wang H,Chao T,Xiao Z,Gao M,Rincon-Restrepo M,Franco F,Genolet R,Cheng WC,Jandus C,Coukos G,Jiang YF,Locasale JW,Zippelius A,Liu PS,Tang L,Bock C,Vannini N,Ho PCdoi
10.1038/s41590-020-0793-3subject
Has Abstractpub_date
2020-12-01 00:00:00pages
1540-1551issue
12eissn
1529-2908issn
1529-2916pii
10.1038/s41590-020-0793-3journal_volume
21pub_type
杂志文章abstract::The cellular dynamics of the egress of lymphocytes from lymph nodes are poorly defined. Here we visualized the branched organization of lymph node cortical sinuses and found that after entry, some T cells were retained, whereas others returned to the parenchyma. T cells deficient in sphingosine 1-phosphate receptor ty...
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