Perforin-2 is a pore-forming effector of endocytic escape in cross-presenting dendritic cells.
Science
; 380(6651): 1258-1265, 2023 06 23.
Article
em En
| MEDLINE
| ID: mdl-37347855
ABSTRACT
During initiation of antiviral and antitumor T cell-mediated immune responses, dendritic cells (DCs) cross-present exogenous antigens on major histocompatibility complex (MHC) class I molecules. Cross-presentation relies on the unusual "leakiness" of endocytic compartments in DCs, whereby internalized proteins escape into the cytosol for proteasome-mediated generation of MHC I-binding peptides. Given that type 1 conventional DCs excel at cross-presentation, we searched for cell type-specific effectors of endocytic escape. We devised an assay suitable for genetic screening and identified a pore-forming protein, perforin-2 (Mpeg1), as a dedicated effector exclusive to cross-presenting cells. Perforin-2 was recruited to antigen-containing compartments, where it underwent maturation, releasing its pore-forming domain. Mpeg1-/- mice failed to efficiently prime CD8+ T cells to cell-associated antigens, revealing an important role for perforin-2 in cytosolic entry of antigens during cross-presentation.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Apresentação de Antígeno
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Linfócitos T CD8-Positivos
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Endocitose
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Proteínas Citotóxicas Formadoras de Poros
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article