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- W2895965626 abstract "ABSTRACT: Lung cancer has a 5-year survival rate of 17% with current standard-of-care radiation and chemotherapies (1,2,4,8,9). Immune escape contributes to poor tumor clearance driving the development of therapies that promote anti-tumor immune responses (29-33). The cytotoxic T-lymphocyte response distinguishes cancerous cells by the presentation of mutated endogenous antigens on MHC-1 molecules (26,29-33). Radiation therapy has been shown to increase MHC-1 antigen presentation (22-23,30). It has been proposed that DNA-damage response signaling inhibits translation during radiation induced cell recovery resulting in a post-repair spike in translation and MHC-1 presentation (22-23,30). We hypothesize that ATM and ATR inhibition will disrupt the negative regulation of translation post-radiation to impact the rate of MHC-1 presentation. Increasing antigen presentation before cell recovery from radiation damage may increase the magnitude of mutant antigens to stimulate anti-tumor CD8+ T-cell activation. This investigation attempted to monitor the impact of DNA-damage response inhibition on translation and subsequent MHC-1 presentation post-radiation at two levels. First, fluctuations in the intracellular peptide pool available for MHC-1 antigen loading was measured via the activity of Transporter associated with Antigen Processing (TAP) responsible for shuttling cytosolic peptides into the ER for MHC-1 antigen loading (20-2226). Fluorescence Recovery After Photobleaching (FRAP) of TAP1-mNeonGreen was used to calculate the lateral diffusion of TAP within the ER membrane as diffusion is inversely correlated to TAP activity. Second, MHC-1 cell surface presentation was measured via flow cytometry." @default.
- W2895965626 created "2018-10-26" @default.
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- W2895965626 date "2018-09-11" @default.
- W2895965626 modified "2023-09-27" @default.
- W2895965626 title "PROGRESS TOWARDS INVESTIGATION OF THE IMPACT OF TARGETED INHIBITION OF POTENTIAL DNA-DAMAGE RESPONSE REGULATION OF TRANSLATION IN IRRADIATED NON-SMALL CELL LUNG CANCER CELL LINES" @default.
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