title: Prediction of blood-brain barrier permeation of α-adrenergic and imidazoline receptor ligands using PAMPA technique and quantitative-structure permeability relationship analysis.
abstract: Imidazoline receptor ligands are a numerous family of biologically active compounds known to produce central hypotensive effect by interaction with both α2-adrenoreceptors (α2-AR) and imidazoline receptors (IRs). Recent hypotheses connect those ligands with several neurological disorders. Therefore some IRs ligands are examined as novel centrally acting antihypertensives and drug candidates for treatment of various neurological diseases. Effective Blood-Brain Barrier (BBB) permeability (P(e)) of 18 IRs/α-ARs ligands and 22 Central Nervous System (CNS) drugs was experimentally determined using Parallel Artificial Membrane Permeability Assay (PAMPA) and studied by the Quantitative-Structure-Permeability Relationship (QSPR) methodology. The dominant molecules/cations species of compounds have been calculated at pH = 7.4. The analyzed ligands were optimized using Density Functional Theory (B3LYP/6-31G(d,p)) included in ChemBio3D Ultra 13.0 program and molecule descriptors for optimized compounds were calculated using ChemBio3D Ultra 13.0, Dragon 6.0 and ADMET predictor 6.5 software. Effective permeability of compounds was used as dependent variable (Y), while calculated molecular parametres were used as independent variables (X) in the QSPR study. SIMCA P+ 12.0 was used for Partial Least Square (PLS) analysis, while the stepwise Multiple Linear Regression (MLR) and Artificial Neural Networks (ANN) modeling were performed using STASTICA Neural Networks 4.0. Predictive potential of the formed models was confirmed by Leave-One-Out Cross- and external-validation and the most reliable models were selected. The descriptors that are important for model building are identified as well as their influence on BBB permeability. Results of the QSPR studies could be used as time and cost efficient screening tools for evaluation of BBB permeation of novel α-adrenergic/imidazoline receptor ligands, as promising drug candidates for treatment of hypertension or neurological diseases.
authors.affiliation: Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, PO Box 146, 11000 Belgrade, Serbia. Electronic address: jelicav@pharmacy.bg.ac.rs.
authors.forename: Jelica
authors.initials: J
authors.lastname: Vucicevic
authors.affiliation: Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, PO Box 146, 11000 Belgrade, Serbia.
authors.forename: Katarina
authors.initials: K
authors.lastname: Nikolic
authors.affiliation: Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, PO Box 146, 11000 Belgrade, Serbia.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Dobričić
authors.affiliation: Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, PO Box 146, 11000 Belgrade, Serbia.
authors.forename: Danica
authors.initials: D
authors.lastname: Agbaba
mesh_terms: D001812:Blood-Brain Barrier / Q000378:metabolism*; D002463:Cell Membrane Permeability; D054755:Imidazoline Receptors / Q000378:metabolism*; D008024:Ligands; D008055:Lipids / Q000737:chemistry; D008567:Membranes, Artificial; D008954:Models, Biological; D010539:Permeability; D004364:Pharmaceutical Preparations / Q000737:chemistry / Q000378:metabolism*; D021281:Quantitative Structure-Activity Relationship; D011942:Receptors, Adrenergic, alpha / Q000378:metabolism*
chemical_list: D054755:Imidazoline Receptors; D008024:Ligands; D008055:Lipids; D008567:Membranes, Artificial; D004364:Pharmaceutical Preparations; D011942:Receptors, Adrenergic, alpha
keywords: Blood–brain barrier permeability; Brimonidine (PubChem CID: 2435); Idazoxan (PubChem CID: 54459); Imidazoline ligands; Moxonidine (PubChem CID: 4810); Naphazoline (PubChem CID: 4436); PAMPA; QSPR; Rilmenidine (PubChem CID: 68712)