title: Linking solubility and permeability assays for maximum throughput and reproducibility.
abstract: Solubility and permeability are intimately linked in drug absorption processes. They have, however, been traditionally assayed separately. To support this linkage, a combined solubility/permeability assay was developed for determining absorption properties of chemical entities. First, solubility is determined at 4 pH values by comparing the concentration of a saturated compound solution to its dilute, known concentration. The filtered, saturated solution from the solubility assay is then used as input material for the membrane permeability determination. The permeability assay is a parallel artificial membrane technique whereby a membrane is created on a solid support parallel artificial membrane permeation assay (PAMPA). The 2 artificial membranes presented here model the gastrointestinal tract and the blood-brain barrier (BBB). Data are presented for control compounds, which are well documented in the literature and exemplify a range of solubility and membrane permeability. The advantages of the combination method are 1) reduction of sample usage and preparation time, 2) elimination of interference from compound precipitation in membrane permeability determination, 3) maximization of input concentration to permeability assay for improved reproducibility, and 4) optimization of sample tracking by streamlining data entry and calculations. BBB permeability ranking of compounds correlates well with literature CNS activity.
authors.affiliation: Lead Discovery Department, AGY Therapeutics Inc., South San Francisco, CA 94080, USA. dwexler@agyinc.com
authors.forename: David S
authors.initials: DS
authors.lastname: Wexler
authors.forename: Liping
authors.initials: L
authors.lastname: Gao
authors.forename: Francisco
authors.initials: F
authors.lastname: Anderson
authors.forename: Arnold
authors.initials: A
authors.lastname: Ow
authors.forename: Laszlo
authors.initials: L
authors.lastname: Nadasdi
authors.forename: Alanna
authors.initials: A
authors.lastname: McAlorum
authors.forename: Roman
authors.initials: R
authors.lastname: Urfer
authors.forename: Shu-Gui
authors.initials: SG
authors.lastname: Huang
mesh_terms: D001812:Blood-Brain Barrier; D041981:Gastrointestinal Tract / Q000378:metabolism; D010539:Permeability; D010599:Pharmacokinetics; D015203:Reproducibility of Results; D012995:Solubility