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- W2016585612 abstract "Drug resistance has been associated with resistance to NK- and LAK-cell-mediated cytotoxicity. We evaluated this issue in human cell lines, using multiple myeloma cells (8226) and 2 multi-drug-resistant (MDR) sublines selected using doxorubicin (8226/Dox40) and mitoxantrone (8226/MR40). In parallel, we studied the human breast carcinoma cell line series MCF7, MCF7/D40 and MCF7/Mitox. Unlike the sensitive parental cell lines, all 4 sublines display MDR-patterns of resistance, with the P-glycoprotein pump (P-170) detected only in the doxorubicin-selected sublines. Flow cytometric and immunocytochemical analyses showed expression of cellular adhesion molecules ICAM-1 and LFA-3, and MHC-Class-1 (MCF7/D40 only), to be decreased in the doxorubicin-selected MDR-sublines, whereas expression of CD56 (Leu 19) was strongly up-regulated in 8226/Dox40. Lysis of P-170-positive MDR tumor cells by NK or LAK cells was, however, unaffected by these alterations, suggesting redundancy in effector: target-cell adhesion pathways. Mitoxantrone-selected tumor cells did not display P-170, nor did they show altered expression of cellular adhesion molecules. Their susceptibility to NK or LAK cytolysis was also unimpaired as compared to the parental cell lines. Clinically, these results imply that immunotherapeutic modalities aiming at increased natural killer functions deserve full consideration even in patients who have become refractory to further cytostatic drug treatment." @default.
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- W2016585612 date "1991-06-19" @default.
- W2016585612 modified "2023-09-24" @default.
- W2016585612 title "Altered expression of P-glycoprotein and cellular adhesion molecules on human multi-drug-resistant tumor cells does not affect their susceptibility to NK- and LAK-mediated cytotoxicity" @default.
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- W2016585612 doi "https://doi.org/10.1002/ijc.2910480414" @default.
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