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- W66352156 abstract "Recent evidence suggests that deficient HLA Class I expression in SCLC lines may be due, in part, to down-regulation of TAP-1 and TAP-2 expression, and, thus, deficient antigen processing. Given the capability of the multidrug transporter mediating MDR, P-gp, to transport peptides, we hypothesized that P-gp may substitute for TAP-1/TAP-2 and enhance antigen processing in SCLC. To investigate this, we studied the H69 line (parent SCLC) and VPR-2 (MDR subline selected in etoposide, P-gp +). HLA-A,B,C expression was significantly increased in VPR-2 cells relative to H69, and was much more inducible with IFN-gamma. TAP-1 and TAP-2 were expressed at low levels in both lines. Differential induction of TAP-1 expression with IFN-gamma exposure was observed, with a dramatic increase in VPR-2 cells, and no change in H69. TAP-2 expression was enhanced in both lines with IFN-gamma, but to a greater degree in VPR-2. VPR-2 cells were resistant to LAK killing relative to H69, and were minimally sensitized with IFN-gamma. In contrast, IFN-gamma enhanced susceptibility of H69 to LAK killing 3-fold. The direct correlation between enhancement of HLA-A,B,C expression by IFN-gamma and the differential inducibility of TAP-1 and TAP-2 expression in P-gp-SCLC lines is novel. Relative LAK sensitivity of H69 and its increase by IFN-gamma may have clinical implications." @default.
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- W66352156 date "1994-04-01" @default.
- W66352156 modified "2023-09-23" @default.
- W66352156 title "Enhanced expression of HLA-A,B,C and inducibility of TAP-1, TAP-2, and HLA-A,B,C by interferon-gamma in a multidrug-resistant small cell lung cancer line." @default.
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