Drug permeability across a phospholipid vesicle based barrier : A novel approach for studying passive diffusion
The aim of this study was to develop a novel predictive medium-throughput screening method for drug permeability, with use of a tight barrier of liposomes on a filter support. To our knowledge no one has succeeded in depositing membrane barriers without the use of inert solvent such as hexadecane. T...
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Published in | European journal of pharmaceutical sciences Vol. 27; no. 1; pp. 80 - 90 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Shannon
Elsevier
2005
Elsevier Science |
Subjects | |
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Abstract | The aim of this study was to develop a novel predictive medium-throughput screening method for drug permeability, with use of a tight barrier of liposomes on a filter support. To our knowledge no one has succeeded in depositing membrane barriers without the use of inert solvent such as hexadecane. The first part of the study involved development of a protocol for preparation of these barriers, which were made of liposomes from egg phosphatidylcholin in phosphate buffer pH 7.4 with 10 % (v/v) ethanol. The liposomes were deposited into the pores and onto the surface of a filter support (mixed cellulose ester) by use of centrifugation. Solvent evaporation and freeze-thaw cycling were then used to promote fusion of liposomes and a tight barrier could be obtained as shown with calcein permeability and electrical resistance. In the second part of the study the model was validated using 21 drug compounds, which cover a wide range of physicochemical properties and absorption (Fa) in humans (13-100%). The drug permeation studies were carried out at room temperature with phosphate buffer (pH 7.4) in both acceptor and donor chambers. The apparent permeability coefficients obtained from the phospholipid vesicle based model correlated well with literature data on human absorption in vivo, which suggests that its performance is adequate and that the method is suitable for rapid screening of passive transport of new chemical entities. The results obtained from our model were compared with polar surface area (PSA) and experimental log D and results obtained by established permeability screening methods such as immobilised liposome chromatography (ILC), the PAMPA models and the Caco-2 model. Our approach seems to model the in vivo absorption better than PSA, experimental log D, the ILC and PAMPA models, when similar conditions are used as in our assay, and equally well as the Caco-2 model and the Double Sink PAMPA (DS-PAMPA) model. |
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AbstractList | The aim of this study was to develop a novel predictive medium-throughput screening method for drug permeability, with use of a tight barrier of liposomes on a filter support. To our knowledge no one has succeeded in depositing membrane barriers without the use of inert solvent such as hexadecane. The first part of the study involved development of a protocol for preparation of these barriers, which were made of liposomes from egg phosphatidylcholin in phosphate buffer pH 7.4 with 10 % (v/v) ethanol. The liposomes were deposited into the pores and onto the surface of a filter support (mixed cellulose ester) by use of centrifugation. Solvent evaporation and freeze-thaw cycling were then used to promote fusion of liposomes and a tight barrier could be obtained as shown with calcein permeability and electrical resistance. In the second part of the study the model was validated using 21 drug compounds, which cover a wide range of physicochemical properties and absorption (Fa) in humans (13-100%). The drug permeation studies were carried out at room temperature with phosphate buffer (pH 7.4) in both acceptor and donor chambers. The apparent permeability coefficients obtained from the phospholipid vesicle based model correlated well with literature data on human absorption in vivo, which suggests that its performance is adequate and that the method is suitable for rapid screening of passive transport of new chemical entities. The results obtained from our model were compared with polar surface area (PSA) and experimental log D and results obtained by established permeability screening methods such as immobilised liposome chromatography (ILC), the PAMPA models and the Caco-2 model. Our approach seems to model the in vivo absorption better than PSA, experimental log D, the ILC and PAMPA models, when similar conditions are used as in our assay, and equally well as the Caco-2 model and the Double Sink PAMPA (DS-PAMPA) model. |
Author | LUTHMAN, Kristina DHANIKULA, Anand Babu BRANDL, Martin FLATEN, Gøril Eide |
Author_xml | – sequence: 1 givenname: Gøril Eide surname: FLATEN fullname: FLATEN, Gøril Eide organization: University of Tromsø, Institute of Pharmacy, Department of Pharmaceutics and Biopharmaceutics, 9037 Tromsø, Norway – sequence: 2 givenname: Anand Babu surname: DHANIKULA fullname: DHANIKULA, Anand Babu organization: University of Tromsø, Institute of Pharmacy, Department of Pharmaceutics and Biopharmaceutics, 9037 Tromsø, Norway – sequence: 3 givenname: Kristina surname: LUTHMAN fullname: LUTHMAN, Kristina organization: Göteborg University, Department of Chemistry, Medicinal Chemistry, 412 96 Göteborg, Sweden – sequence: 4 givenname: Martin surname: BRANDL fullname: BRANDL, Martin organization: University of Tromsø, Institute of Pharmacy, Department of Pharmaceutics and Biopharmaceutics, 9037 Tromsø, Norway |
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Keywords | Drug Vesicle Pharmaceutical technology Gut Prediction Oral administration Immobilization Liposome Phospholipid Artificial membrane Permeability Chromatography Absorption Artificial membrane Prediction Oral absorption PAMPA Caco-2 model Immobilized liposome chromatography (ILC) PSA Passive diffusion Permeability classification Liposome Intestinal absorption Phospholipid Classification Microparticle Pharmacokinetics Diffusion |
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Title | Drug permeability across a phospholipid vesicle based barrier : A novel approach for studying passive diffusion |
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