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• W2013173831 abstract "We have previously shown that in Chinese hamster ovary (CHO) cells, a mutant cell line with a defective regulatory subunit (RI) for the cAMP-dependent protein kinase (Abraham et al: Mol. Cell. Biol., 7:3098-3106, 1987), and a transfectant cell line expressing the same mutant kinase, showed increased sensitivity to a number of drugs that are known to be substrates for the multidrug transporter (P-glycoprotein). In the current study we have investigated the mechanism by which cAMP-dependent protein kinase controls drug resistance. We report here that the sensitivity of the kinase defective CHO cell lines to multiple drugs results from decreased RNA levels for the multidrug-resistance gene. Similar results were obtained with mouse Y1 adrenal cells. Wild-type Y1 cells had high levels of P-glycoprotein due to expression of both the mdr1b and mdr2 genes, whereas the cAMP-dependent protein kinase mutant Kin 8 cells had decreased RNA levels for these genes. A Kin 8 transfectant with restored cAMP-dependent protein kinase activity recovered mdr expression, indicating a cause and effect relationship between the protein kinase mutations and mdr expression. No changes in nuclear run-off assays could be detected, suggesting a non-transcriptional mechanism of regulation. Wild-type Y1 cells are more drug sensitive despite having higher levels of P-glycoprotein than the mutant cells. This paradoxical result may be explained by the higher rate of synthesis of steroids by the wild-type Y1 cells, which appear to be inhibitors of P-glycoprotein transport activity." @default.
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• W2013173831 date "1992-07-01" @default.
• W2013173831 modified "2023-09-27" @default.
• W2013173831 title "Reduced mRNA levels for the multidrug-resistance genes in cAMP-dependent protein kinase mutant cell lines" @default.
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• W2013173831 doi "https://doi.org/10.1002/jcp.1041520112" @default.
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