title: Barrier functionality of porcine and bovine brain capillary endothelial cells.
abstract: BACKGROUND
  To date, isolated cell based blood-brain barrier (BBB) models have been widely used for brain drug delivery and targeting, due to their relatively proper bioelectrical and permeability properties. However, primary cultures of brain capillary endothelial cells (BCECs) isolated from different species vary in terms of bioelectrical and permeability properties.
  
  
  METHODS
  To pursue this, in the current investigation, primary porcine and bovine BCECs (PBCECs and BBCECs, respectively) were isolated and used as an in vitro BBB model. The bioelectrical and permeability properties were assessed in BCECs co-cultured with C6 cells with/without hydrocortisone (550 nM). The bioelectrical properties were further validated by means of the permeability coefficients of transcellular and paracellular markers.
  
  
  RESULTS
  The primary PBCECs displayed significantly higher trans-endothelial electrical resistance (~900 Ω.cm(2)) than BBCECs (~700 Ω.cm(2)) - both cocultured with C6 cells in presence of hydrocortisone. Permeability coefficients of propranolol/diazepam and mannitol/sucrose in PBCECs were ~21 and ~2 (×10(-6) cm.sec(-1)), where these values for BBCECs were ~25 and ~5 (×10(-6) cm.sec(-1)).
  
  
  CONCLUSIONS
  Upon our bioelectrical and permeability findings, both models display discriminative barrier functionality but porcine BCECs seem to provide a better platform than bovine BCECs for drug screening and brain targeting.
authors.affiliation: Research Center for Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Ailar
authors.initials: A
authors.lastname: Nakhlband
authors.forename: Yadollah
authors.initials: Y
authors.lastname: Omidi
keywords: Bioelectrical properties; Blood-brain barrier; Brain targeting; Cell and tissue engineering; Cell culture model