例如:"lncRNA", "apoptosis", "WRKY"

GTPase-activating protein Rasal1 associates with ZAP-70 of the TCR and negatively regulates T-cell tumor immunity.

Nat Commun. 2019 Oct 22;10(1):4804
Youg Raj Thaker 1 , Monika Raab 2 , Klaus Strebhardt 2 , Christopher E Rudd 3
Youg Raj Thaker 1 , Monika Raab 2 , Klaus Strebhardt 2 , Christopher E Rudd 3

[No authors listed]

Author information
  • 1 School of Biological Science, Protein Structure and Disease Mechanisms, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK.
  • 2 Department of Obstetrics and Gynaecology, School of Medicine, J.W. Goethe-University, Theodor-Stern-Kai 7, 60590, Frankfurt, Germany.
  • 3 Département de Medicine, Université de Montréal, Montreal, QC, H3C 3J7, Canada. christopher.e.rudd@umontreal.ca.

摘要


Immunotherapy involving checkpoint blockades of inhibitory co-receptors is effective in combating cancer. Despite this, the full range of mediators that inhibit T-cell activation and influence anti-tumor immunity is unclear. Here, we identify the GTPase-activating protein (GAP) Rasal1 as a novel TCR-ZAP-70 binding protein that negatively regulates T-cell activation and tumor immunity. Rasal1 inhibits via two pathways, the binding and inhibition of the kinase domain of ZAP-70, and GAP inhibition of the p21ras-ERK pathway. It is expressed in activated CD4 + and CD8 + T-cells, and inhibits CD4 + T-cell responses to antigenic peptides presented by dendritic cells as well as CD4 + T-cell responses to peptide antigens in vivo. Furthermore, siRNA reduction of Rasal1 expression in T-cells shrinks B16 melanoma and EL-4 lymphoma tumors, concurrent with an increase in CD8 + tumor-infiltrating T-cells expressing granzyme B and interferon γ-1. Our findings identify ZAP-70-associated Rasal1 as a new negative regulator of T-cell activation and tumor immunity.