The low-density lipoprotein receptor-mTORC1 axis coordinates CD8+ T cell activation.
J Cell Biol
; 221(11)2022 11 07.
Article
em En
| MEDLINE
| ID: mdl-36129440
ABSTRACT
Activation of T cells relies on the availability of intracellular cholesterol for an effective response after stimulation. We investigated the contribution of cholesterol derived from extracellular uptake by the low-density lipoprotein (LDL) receptor in the immunometabolic response of T cells. By combining proteomics, gene expression profiling, and immunophenotyping, we described a unique role for cholesterol provided by the LDLR pathway in CD8+ T cell activation. mRNA and protein expression of LDLR was significantly increased in activated CD8+ compared to CD4+ WT T cells, and this resulted in a significant reduction of proliferation and cytokine production (IFNγ, Granzyme B, and Perforin) of CD8+ but not CD4+ T cells from Ldlr -/- mice after in vitro and in vivo stimulation. This effect was the consequence of altered cholesterol routing to the lysosome resulting in a lower mTORC1 activation. Similarly, CD8+ T cells from humans affected by familial hypercholesterolemia (FH) carrying a mutation on the LDLR gene showed reduced activation after an immune challenge.
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Base de dados:
MEDLINE
Assunto principal:
Receptores de LDL
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Ativação Linfocitária
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Colesterol
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Linfócitos T CD8-Positivos
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Alvo Mecanístico do Complexo 1 de Rapamicina
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article