The Capicua/ETS Translocation Variant 5 Axis Regulates Liver-Resident Memory CD8⁺ T-Cell Development and the Pathogenesis of Liver Injury.

Liver-resident memory T (liver T_RM ) cells exert protective immune responses following liver infection by malaria parasites. However, how these T_RM cells are developed and what the consequence is if they are not properly maintained remain poorly understood. Here, we show that the transcriptional repressor, Capicua (CIC), controls liver CD8⁺ T_RM cell development to maintain normal liver function. Cic-deficient mice have a greater number of liver CD8⁺ T_RM cells and liver injury phenotypes accompanied by increased levels of proinflammatory cytokine genes in liver tissues. Excessive formation of CD69⁺ CD8⁺ T_RM -like cells was also observed in mice with acetaminophen-induced liver injury (AILI). Moreover, expansion of liver CD8⁺ T_RM cell population and liver injury phenotypes in T-cell-specific Cic null mice were rescued by codeletion of ETS translocation variant [Etv]5 alleles, indicating that Etv5 is a CIC target gene responsible for regulation of CD8⁺ T_RM cell development and liver function. We also discovered that ETV5 directly regulates expression of Hobit, a master transcription factor for T_RM cell development, in CD8⁺ T cells. Conclusion: Our findings suggest the CIC-ETV5 axis as a key molecular module that controls CD8⁺ T_RM cell development, indicating a pathogenic role for CD8⁺ T_RM cells in liver injury.

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