title: Overcoming multidrug resistance in taxane chemotherapy.
abstract: Paclitaxel (Taxol) and docetaxel (Taxotère) are currently two of the most important anticancer drugs in cancer chemotherapy. However, clinical treatment with these taxane agents often encounters undesirable side effects and multidrug resistance (MDR) caused by overexpression of P-glycoprotein (Pgp). Photoaffinity labeling of Pgp using photoreactive radiolabeled paclitaxel analogs along with molecular modeling has revealed a unique binding region for paclitaxel on the C-terminal half of Pgp. Highly efficient taxane-based MDR reversal agents (TRAs) have been developed. Extensive structure-activity relationship (SAR) studies have led to the development of new generation taxanes that possess 2-3 orders of magnitude higher potencies against human cancer cell lines expressing the MDR phenotype. One of these taxanes, SB-T-1 10131 (IDN5109, BAY59-8862), exhibits excellent activity against a variety of drug-sensitive and drug-resistant cancer cell lines as well as human tumor xenografts in mice. This taxane is orally active with excellent bioavailability, and is currently undergoing phase II human clinical trials. Novel taxane-antibody immunoconjugates have shown very promising results for tumor-specific delivery and release of an extremely cytotoxic taxane, wherein epidermal growth factor receptor is used as the specific antigen on the tumor surface of human squamous cancer xenograft in SCID mice.
authors.affiliation: Department of Chemistry, State University of New York at Stony Brook, 11794-3400, USA.
authors.forename: Raphaël
authors.initials: R
authors.lastname: Geney
authors.forename: loana Maria
authors.initials: lM
authors.lastname: Ungureanu
authors.forename: Dansu
authors.initials: D
authors.lastname: Li
authors.forename: Iwao
authors.initials: I
authors.lastname: Ojima
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B / Q000737:chemistry / Q000378:metabolism; D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D001952:Bridged-Ring Compounds / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D000077143:Docetaxel; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D006801:Humans; D008958:Models, Molecular; D017239:Paclitaxel / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology; D043823:Taxoids
chemical_list: D018435:ATP Binding Cassette Transporter, Subfamily B; D000972:Antineoplastic Agents, Phytogenic; D001952:Bridged-Ring Compounds; D043823:Taxoids; D000077143:Docetaxel; C080625:taxane; D017239:Paclitaxel