Modulators and substrates of P-glycoprotein and cytochrome P4503A coordinately up-regulate these proteins in human colon carcinoma cells
| Autor: | E G, Schuetz, W T, Beck, J D, Schuetz |
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| Rok vydání: | 1996 |
| Předmět: |
Base Sequence
Midazolam Molecular Sequence Data Cytochrome P-450 CYP2E1 Adenocarcinoma Blotting Northern Polymerase Chain Reaction Dexamethasone Cell Line Mixed Function Oxygenases Gene Expression Regulation Neoplastic Cytochrome P-450 Enzyme System Verapamil Doxorubicin Multigene Family Phenobarbital Phenytoin Colonic Neoplasms Tumor Cells Cultured Humans ATP Binding Cassette Transporter Subfamily B Member 1 Clotrimazole Rifampin DNA Primers |
| Zdroj: | Molecular pharmacology. 49(2) |
| ISSN: | 0026-895X |
| Popis: | Xenobiotics frequently induce proteins involved in their detoxification. Because many drugs that are metabolized by human cytochromes P450 (CYP) 3A4 and 3A5 are also transported by the drug efflux pump P-glycoprotein, we determined whether expression of these proteins was altered by a variety of drugs in a cell line derived from a human colon adenocarcinoma, LS180/WT, and its adriamycin-resistant subline, LS180/AD50. P-glycoprotein and CYP3A4 were constitutively expressed in both LS180/AD50 and LS180/WT cells, and both proteins were up-regulated after treatment with many drugs, including rifampicin, phenobarbital, clotrimazole, reserpine, and isosafrole. However, there were some exceptions because P-glycoprotein was up-regulated by midazolam and nifedipine, whereas CYP3A4 was not. CYP3A5, which is also constitutively expressed in these cells, remained unchanged with most drug treatments but was up-regulated by reserpine and clotrimazole. The apparent coordinated coexpression of the CYP3A gene family and P-glycoprotein in the LS180 cells suggests that for common orally administered drugs, P-glycoprotein may play an important role in net drug absorption and drug/drug interactions of shared CYP3A4/P-glycoprotein substrates. |
| Databáze: | OpenAIRE |
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