ArticlebioRxiv : the preprint server for biology2025
MDR1 promotes CD8 T cell persistence in tumors and protects against cytotoxic chemotherapy.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Multidrug transporters, including multidrug resistance-1 (MDR1), are recognized chiefly for effluxing chemotherapeutic drugs out of tumor cells. However, they are also expressed in many normal cells and tissues, including lymphocytes, but their physiological role is less well-understood. Here, we investigated the role of MDR1 in tumor-specific CD8 T cells (TST), which are critical in antitumor immunity and key targets of immunotherapies. Using a clinically-relevant genetic liver cancer mouse model, we investigated the efflux dynamics of TST as they underwent activation, proliferation, and differentiation to dysfunctional states in tumor-bearing hosts. Surprisingly, we found that late-stage/terminally dysfunctional TST had the highest efflux capacity in both murine and human liver tumors. TST upregulated transcription of
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