title: An in silico approach for screening flavonoids as P-glycoprotein inhibitors based on a Bayesian-regularized neural network.
abstract: P-glycoprotein (P-gp), an ATP-binding cassette (ABC) transporter, functions as a biological barrier by extruding cytotoxic agents out of cells, resulting in an obstacle in chemotherapeutic treatment of cancer. In order to aid in the development of potential P-gp inhibitors, we constructed a quantitative structure-activity relationship (QSAR) model of flavonoids as P-gp inhibitors based on Bayesian-regularized neural network (BRNN). A dataset of 57 flavonoids collected from a literature binding to the C-terminal nucleotide-binding domain of mouse P-gp was compiled. The predictive ability of the model was assessed using a test set that was independent of the training set, which showed a standard error of prediction of 0.146+/-0.006 (data scaled from 0 to 1). Meanwhile, two other mathematical tools, back-propagation neural network (BPNN) and partial least squares (PLS) were also attempted to build QSAR models. The BRNN provided slightly better results for the test set compared to BPNN, but the difference was not significant according to F-statistic at p=0.05. The PLS failed to build a reliable model in the present study. Our study indicates that the BRNN-based in silico model has good potential in facilitating the prediction of P-gp flavonoid inhibitors and might be applied in further drug design.
authors.affiliation: Laboratory of Pharmaceutical Resource Discovery Dalian Institute of Chemical Physics, Graduate School of the Chinese Academy of Sciences, No. 457 Zhongshan Road, 116023, Dalian, China.
authors.forename: Yong-Hua
authors.initials: YH
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Sheng-Li
authors.initials: SL
authors.lastname: Yang
authors.forename: Ling
authors.initials: L
authors.lastname: Yang
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000037:antagonists & inhibitors*; D000818:Animals; D001499:Bayes Theorem; D017076:Computer-Aided Design; D015195:Drug Design; D005419:Flavonoids / Q000737:chemistry / Q000494:pharmacology*; D051379:Mice; D016571:Neural Networks, Computer; D021281:Quantitative Structure-Activity Relationship
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D005419:Flavonoids