title: How well can in vitro brain microcapillary endothelial cell models predict rodent in vivo blood-brain barrier permeability?
abstract: The object of the study was to improve the blood-brain barrier (BBB) permeability in vitro-invivo correlations (IVIVC) between in vitro brain microcapillary endothelial cell (BMEC) models and the well-tested rodent in situ brain perfusion technique. Porcine, bovine, rat, mouse, and human in vitro BMEC apparent permeability values, P(e), (14 studies from several laboratories: 229 P(e), 60 compounds) were analyzed by a novel biophysical model encoded in a weighted nonlinear regression procedure to determine the aqueous boundary layer (ABL) thickness and the paracellular parameters: porosity-pathlength (dual-pore model), pore radius, and water channel electrostatic potential. The refined parameters were then used to transform the P(e) values into the transendothelial permeability (P(c)) values. Porcine BMEC mono-culture models showed tight junctions comparable to those reported in several Caco-2 studies. Bovine cultures were somewhat leakier. In the human primary cultured cell and the hCMEC/D3 cell line data, IVIVC based on P(e) values has r(2) = 0.14. With transformed permeability values, r(2) = 0.58. Comparable improvements were found in the other species data. By using the in vitro transendothelial P(c) values in place of the apparent P(e) values, IVIVC can be dramatically improved.
authors.affiliation: pION INC, Woburn, MA 01801, USA. aavdeef@pion-inc.com
authors.forename: Alex
authors.initials: A
authors.lastname: Avdeef
mesh_terms: D000465:Algorithms; D000818:Animals; D001692:Biological Transport / Q000502:physiology; D001812:Blood-Brain Barrier / Q000166:cytology / Q000378:metabolism; D018938:Caco-2 Cells; D002199:Capillary Permeability / Q000502:physiology*; D002417:Cattle; D042783:Endothelial Cells / Q000166:cytology / Q000378:metabolism; D004730:Endothelium, Vascular / Q000166:cytology / Q000378:metabolism; D006801:Humans; D051379:Mice; D008954:Models, Biological; D010477:Perfusion; D004364:Pharmaceutical Preparations / Q000378:metabolism; D051381:Rats; D012044:Regression Analysis; D013552:Swine; D019108:Tight Junctions / Q000378:metabolism
chemical_list: D004364:Pharmaceutical Preparations