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- W2077889916 abstract "A human T lymphoblastoid CCRF-CEM cell line exhibiting cross resistance to a variety of drugs was selected with increasing doses of actinomycin D. A subline, designated CCRF ACTD400+, was permanently cultured in the presence of 400 ng/ml Actinomycin D for several months. Using a fragment of the human mdrl cDNA we found high expression of a 5 kb mRNA species which was not detectable in the sensitive parental CCRF-CEM cell line. The extent of the mdr-mRNA expression in resistant cells, however, depended on the presence or absence of actinomycin D in the culture medium: when the inhibitor was omitted, the expression decreased to about 60% after one month. In reverse, the steady state level of the P-glycoprotein mRNA increased about 2.5-fold within 72 h after the original dose of the drug was added again. In further experiments we recorded the actinomycin D or adriamycin dose response curves of the variously treated sublines by evaluation of [3H]uridine or [3H]thymidine incorporation, respectively, into acid insoluble material. Consistently, the drug sensitivity of the respective macromolecular synthesis was found to decrease with increasing mdr-mRNA levels." @default.
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- W2077889916 date "1988-09-01" @default.
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- W2077889916 title "Expression of a P-glycoprotein gene is inducible in a multidrug resistant human leukemia cell line" @default.
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- W2077889916 doi "https://doi.org/10.1016/s0006-291x(88)80559-x" @default.
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