title: Pharmacogenomics of the human ABC transporter ABCG2: from functional evaluation to drug molecular design.
abstract: In the post-genome-sequencing era, emerging genomic technologies are shifting the paradigm for drug discovery and development. Nevertheless, drug discovery and development still remain high-risk and high-stakes ventures with long and costly timelines. Indeed, the attrition of drug candidates in preclinical and development stages is a major problem in drug design. For at least 30% of the candidates, this attrition is due to poor pharmacokinetics and toxicity. Thus, pharmaceutical companies have begun to seriously re-evaluate their current strategies of drug discovery and development. In that light, we propose that a transport mechanism-based design might help to create new, pharmacokinetically advantageous drugs, and as such should be considered an important component of drug design strategy. Performing enzyme- and/or cell-based drug transporter, interaction tests may greatly facilitate drug development and allow the prediction of drug-drug interactions. We recently developed methods for high-speed functional screening and quantitative structure-activity relationship analysis to study the substrate specificity of ABC transporters and to evaluate the effect of genetic polymorphisms on their function. These methods would provide a practical tool to screen synthetic and natural compounds, and these data can be applied to the molecular design of new drugs. In this review article, we present an overview on the genetic polymorphisms of human ABC transporter ABCG2 and new camptothecin analogues that can circumvent AGCG2-associated multidrug resistance of cancer.
authors.affiliation: Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8501 Japan. tishikaw@bio.titech.ac.jp
authors.forename: Toshihisa
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Ai
authors.initials: A
authors.lastname: Tamura
authors.forename: Hikaru
authors.initials: H
authors.lastname: Saito
authors.forename: Kanako
authors.initials: K
authors.lastname: Wakabayashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nakagawa
mesh_terms: D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters / Q000235:genetics* / Q000378:metabolism; D000483:Alleles; D000970:Antineoplastic Agents / Q000493:pharmacokinetics; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D005006:Ethnicity / Q000235:genetics; D005787:Gene Frequency; D006801:Humans; D009363:Neoplasm Proteins / Q000235:genetics* / Q000378:metabolism; D011110:Polymorphism, Genetic; D013379:Substrate Specificity
chemical_list: C116614:ABCG2 protein, human; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters; D000970:Antineoplastic Agents; D009363:Neoplasm Proteins