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Albumin-Mediated Size Exclusion Chromatography: The Apparent Molecular Weight of PSMA Radioligands as Novel Parameter to Estimate Their Blood Clearance Kinetics. Pharmaceuticals (Basel) 2022; 15:ph15091161. [PMID: 36145382 PMCID: PMC9500755 DOI: 10.3390/ph15091161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/13/2022] [Accepted: 09/14/2022] [Indexed: 11/17/2022] Open
Abstract
A meticulously adjusted pharmacokinetic profile and especially fine-tuned blood clearance kinetics are key characteristics of therapeutic radiopharmaceuticals. We, therefore, aimed to develop a method that allowed the estimation of blood clearance kinetics in vitro. For this purpose, 177Lu-labeled PSMA radioligands were subjected to a SEC column with human serum albumin (HSA) dissolved in a mobile phase. The HSA-mediated retention time of each PSMA ligand generated by this novel 'albumin-mediated size exclusion chromatography' (AMSEC) was converted to a ligand-specific apparent molecular weight (MWapp), and a normalization accounting for unspecific interactions between individual radioligands and the SEC column matrix was applied. The resulting normalized MWapp,norm. could serve to estimate the blood clearance of renally excreted radioligands by means of their influence on the highly size-selective process of glomerular filtration (GF). Based on the correlation between MW and the glomerular sieving coefficients (GSCs) of a set of plasma proteins, GSCcalc values were calculated to assess the relative differences in the expected GF/blood clearance kinetics in vivo and to select lead candidates among the evaluated radioligands. Significant differences in the MWapp,norm. and GSCcalc values, even for stereoisomers, were found, indicating that AMSEC might be a valuable and high-resolution tool for the preclinical selection of therapeutic lead compounds for clinical translation.
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2
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Tisca JF, Dos Santos K, Pessati TB, Zacchi FL, Soares FS, Oliveira VA, Bebianno MJAF, Bainy ACD, Razzera G. Characterization of a fatty acid-binding protein from the Pacific oyster (Crassostrea gigas): pharmaceutical and toxicological implications. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:27811-27822. [PMID: 33517529 DOI: 10.1007/s11356-021-12645-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 01/20/2021] [Indexed: 06/12/2023]
Abstract
Pharmaceuticals and their metabolites constitute a class of xenobiotics commonly found in aquatic environments which may cause toxic effects in aquatic organisms. Several different lipophilic molecules, including some pharmaceuticals, can bind to fatty acid-binding proteins (FABPs), a group of evolutionarily related cytoplasmic proteins that belong to the intracellular lipid-binding protein (iLBP) family. An oyster FABP genome-wide investigation was not available until a recent study on gene organization, protein structure, and phylogeny of Crassostrea gigas iLBPs. Higher transcript levels of the C. gigas FABP2 gene were found after exposure to sewage and pharmaceuticals. Because of its relevance as a potential biomarker of aquatic contamination, in this study, recombinant FABP2 from C. gigas (CgFABP2) was successfully cloned, expressed, and purified, and in vitro and in silico assays were performed using lipids and pharmaceuticals. This is the first characterization of a protein from the iLBP family in C. gigas. Homology modeling and molecular docking were used to evaluate the binding affinities of natural ligands (palmitic, oleic, and arachidonic acids) and pharmaceuticals (ibuprofen, sodium diclofenac, and acetaminophen). Among the tested fatty acids, CgFABP2 showed preference for palmitic acid. The selected pharmaceuticals presented a biphasic-binding mode, suggesting a different binding affinity with a preference for diclofenac. Therefore, the approach using circular dichroism and in silico data might be useful for ligand-binding screening in an invertebrate model organism.
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Affiliation(s)
- Juliana F Tisca
- Programa de Pós-Graduação em Bioquímica, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
- Laboratório de Biomarcadores de Contaminação Aquática e Imunoquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | - Karin Dos Santos
- Laboratório de Biomarcadores de Contaminação Aquática e Imunoquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
- Núcleo de Bioinformática e Biologia Computacional da UFSC - NuBioinfo, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | - Tomás B Pessati
- Programa de Pós-Graduação em Bioquímica, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
- Laboratório de Biomarcadores de Contaminação Aquática e Imunoquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | - Flávia L Zacchi
- Programa de Pós-Graduação em Bioquímica, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
- Laboratório de Biomarcadores de Contaminação Aquática e Imunoquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | - Fabíola S Soares
- Laboratório de Biomarcadores de Contaminação Aquática e Imunoquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | - Vanessa A Oliveira
- Centro de Biologia Molecular Estrutural, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil
| | - Maria J A F Bebianno
- Centre for Marine and Environmental Research, CIMA, University of Algarve, Campus de Gambelas, 8000-139, Faro, Portugal
| | - Afonso C D Bainy
- Programa de Pós-Graduação em Bioquímica, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil.
- Laboratório de Biomarcadores de Contaminação Aquática e Imunoquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil.
| | - Guilherme Razzera
- Programa de Pós-Graduação em Bioquímica, Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil.
- Laboratório de Biomarcadores de Contaminação Aquática e Imunoquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil.
- Núcleo de Bioinformática e Biologia Computacional da UFSC - NuBioinfo, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil.
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3
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Korunur S, Zengin B, Yilmaz A. Investigation of relaxation times in 5-fluorouracil and human serum albumin mixtures. TURKISH JOURNAL OF BIOCHEMISTRY-TURK BIYOKIMYA DERGISI 2019. [DOI: 10.1515/tjb-2017-0363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Background
Human serum albumin (HSA) is often selected as a subject of any study because albumin is the most abundant protein in human blood plasma. NMR is recognized as a valuable method to determine the structure of proteins-ligand and protein-drug complexes.
Objective – Aim of the study
In this study, protein drug interactions were investigated using 5-Fluorouracil anti-cancer drug and human serum albumin protein.
Materials and methods
In this context 400 MHz NMR spectrometry was used and NMR relaxation rates in drug-albumin complex were investigated with respect to increase albumin concentration and increase in 5-Fluorouracil (5-FU)-albumin solution temperature.
Results
The results of this study indicated that 5-FU had a weak association with albumin, and it easily dissociated from the protein to which it was attached.
Conclusion
The obtained results also gave us useful information about molecular dynamics of drug-albumin interactions.
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Bertozo LDC, Tavares Neto E, Oliveira LCD, Ximenes VF. Oxidative Alteration of Trp-214 and Lys-199 in Human Serum Albumin Increases Binding Affinity with Phenylbutazone: A Combined Experimental and Computational Investigation. Int J Mol Sci 2018; 19:ijms19102868. [PMID: 30241420 PMCID: PMC6213266 DOI: 10.3390/ijms19102868] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Revised: 09/17/2018] [Accepted: 09/19/2018] [Indexed: 12/22/2022] Open
Abstract
Human serum albumin (HSA) is a target for reactive oxygen species (ROS), and alterations of its physiological functions caused by oxidation is a current issue. In this work, the amino-acid residues Trp-214 and Lys-199, which are located at site I of HSA, were experimentally and computationally oxidized, and the effect on the binding constant with phenylbutazone was measured. HSA was submitted to two mild oxidizing reagents, taurine monochloramine (Tau-NHCl) and taurine dibromamine (Tau-NBr₂). The oxidation of Trp-214 provoked spectroscopic alterations in the protein which were consistent with the formation of N'-formylkynurenine. It was found that the oxidation of HSA by Tau-NBr₂, but not by Tau-NHCl, provoked a significant increase in the association constant with phenylbutazone. The alterations of Trp-214 and Lys-199 were modeled and simulated by changing these residues using the putative oxidation products. Based on the Amber score function, the interaction energy was measured, and it showed that, while native HSA presented an interaction energy of -21.3 kJ/mol, HSA with Trp-214 altered to N'-formylkynurenine resulted in an energy of -28.4 kJ/mol, and HSA with Lys-199 altered to its carbonylated form resulted in an energy of -33.9 kJ/mol. In summary, these experimental and theoretical findings show that oxidative alterations of amino-acid residues at site I of HSA affect its binding efficacy.
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Affiliation(s)
- Luiza de Carvalho Bertozo
- Department of Chemistry, Faculty of Sciences, UNESP⁻São Paulo State University, Bauru, SP 17033-360, Brazil.
| | - Ernesto Tavares Neto
- Department of Physics⁻Institute of Biosciences, Humanities and Exact Sciences, UNESP⁻São Paulo State University, São José do Rio Preto, SP 15054-000, Brazil.
| | - Leandro Cristante de Oliveira
- Department of Physics⁻Institute of Biosciences, Humanities and Exact Sciences, UNESP⁻São Paulo State University, São José do Rio Preto, SP 15054-000, Brazil.
| | - Valdecir Farias Ximenes
- Department of Chemistry, Faculty of Sciences, UNESP⁻São Paulo State University, Bauru, SP 17033-360, Brazil.
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5
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Górecki M, Zinna F, Biver T, Di Bari L. Induced circularly polarized luminescence for revealing DNA binding with fluorescent dyes. J Pharm Biomed Anal 2017; 144:6-11. [DOI: 10.1016/j.jpba.2017.02.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 01/13/2017] [Accepted: 02/04/2017] [Indexed: 11/28/2022]
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6
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Kameníková M, Furtmüller PG, Klacsová M, Lopez-Guzman A, Toca-Herrera JL, Vitkovská A, Devínsky F, Mučaji P, Nagy M. Influence of quercetin on the interaction of gliclazide with human serum albumin - spectroscopic and docking approaches. LUMINESCENCE 2017; 32:1203-1211. [PMID: 28513070 DOI: 10.1002/bio.3312] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 12/20/2016] [Accepted: 02/15/2017] [Indexed: 01/13/2023]
Abstract
Protein-binding interactions are displacement reactions which have been implicated as the causative mechanisms in many drug-drug interactions. Thus, the aim of presented study was to analyse human serum albumin-binding displacement interaction between two ligands, hypoglycaemic drug gliclazide and widely distributed plant flavonoid quercetin. Fluorescence analysis was used in order to investigate the effect of substances on intrinsic fluorescence of human serum albumin (HSA) and to define binding and quenching properties of ligand-albumin complexes in binary and ternary systems, respectively. Both ligands showed the ability to bind to HSA, although to a different extent. The displacement effect of one ligand from HSA by the other one has been described on the basis of the quenching curves and binding constants comparison for the binary and ternary systems. According to the fluorescence data analysis, gliclazide presents a substance with a lower binding capacity towards HSA compared with quercetin. Results also showed that the presence of quercetin hindered the interaction between HSA and gliclazide, as the binding constant for gliclazide in the ternary system was remarkably lower compared with the binary system. This finding indicates a possibility for an increase in the non-bound fraction of gliclazide which can lead to its more significant hypoglycaemic effect. Additionally, secondary and tertiary structure conformational alterations of HSA upon binding of both ligands were investigated using synchronous fluorescence, circular dichroism and FT-IR. Experimental data were complemented with molecular docking studies. Obtained results provide beneficial information about possible interference upon simultaneous co-administration of the food/dietary supplement and drug.
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Affiliation(s)
- Miroslava Kameníková
- Department of Pharmacognosy and Botany, Faculty of Pharmacy, Comenius University in Bratislava, Bratislava, Slovakia
| | - Paul Georg Furtmüller
- Department of Chemistry, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Mária Klacsová
- Department of Physical Chemistry of Drugs, Faculty of Pharmacy, Comenius University in Bratislava, Bratislava, Slovakia
| | - Arturo Lopez-Guzman
- Department of Nanobiotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - José Luis Toca-Herrera
- Department of Nanobiotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Anika Vitkovská
- Department of Pharmacognosy and Botany, Faculty of Pharmacy, Comenius University in Bratislava, Bratislava, Slovakia
| | - Ferdinand Devínsky
- Department of Chemical Theory of Drugs, Faculty of Pharmacy, Comenius University in Bratislava, Bratislava, Slovakia
| | - Pavel Mučaji
- Department of Pharmacognosy and Botany, Faculty of Pharmacy, Comenius University in Bratislava, Bratislava, Slovakia
| | - Milan Nagy
- Department of Pharmacognosy and Botany, Faculty of Pharmacy, Comenius University in Bratislava, Bratislava, Slovakia
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7
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Sett R, Ganguly A, Guchhait N. Effect of the binding interaction of an emissive niacin derivative on the conformation and activity of a model plasma protein: A spectroscopic and simulation-based approach. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 164:141-150. [DOI: 10.1016/j.jphotobiol.2016.09.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 09/19/2016] [Accepted: 09/20/2016] [Indexed: 02/04/2023]
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8
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Zsila F, Beke-Somfai T. Dimeric binding of plant alkaloid ellipticine to human serum proteins. RSC Adv 2016. [DOI: 10.1039/c6ra06078a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Induced exciton circular dichroism signals reveal the accommodation of a pair of ellipticine molecules to the subdomain IB of human serum albumin and the β-barrel of α1-acid glycoprotein.
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Affiliation(s)
- Ferenc Zsila
- Biomolecular Self-Assembly Group
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- Budapest
| | - Tamás Beke-Somfai
- Biomolecular Self-Assembly Group
- Institute of Materials and Environmental Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- Budapest
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9
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Tedesco D, Bertucci C. Induced circular dichroism as a tool to investigate the binding of drugs to carrier proteins: Classic approaches and new trends. J Pharm Biomed Anal 2015; 113:34-42. [PMID: 25769668 DOI: 10.1016/j.jpba.2015.02.024] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 02/12/2015] [Indexed: 10/24/2022]
Abstract
Induced circular dichroism (ICD) is a spectroscopic phenomenon that provides versatile and useful methods for characterizing the structural and dynamic properties of the binding of drugs to target proteins. The understanding of biorecognition processes at the molecular level is essential to discover and validate new pharmacological targets, and to design and develop new potent and selective drugs. The present article reviews the main applications of ICD to drug binding studies on serum carrier proteins, going from the classic approaches for the derivation of drug binding parameters and the identification of binding sites, to an overview of the emerging trends for the characterization of binding modes by means of quantum chemical (QC) techniques. The advantages and limits of the ICD methods for the determination of binding parameters are critically reviewed; the capability to investigate the binding interactions of drugs and metabolites to their target proteins is also underlined, as well as the possibility of characterizing the binding sites to obtain a complete picture of the binding mechanism and dynamics. The new applications of ICD methods to identify stereoselective binding modes of drug/protein complexes are then reviewed with relevant examples. The combined application of experimental ICD spectroscopy and QC calculations is shown to identify qualitatively the bound conformations of ligands to target proteins even in the absence of a detailed structure of the binding sites, either obtained from experimental X-ray crystallography and NMR measurements or from computational models of the complex.
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Affiliation(s)
- Daniele Tedesco
- Department of Pharmacy and Biotechnology, University of Bologna, via Belmeloro 6, 40126 Bologna, Italy
| | - Carlo Bertucci
- Department of Pharmacy and Biotechnology, University of Bologna, via Belmeloro 6, 40126 Bologna, Italy.
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10
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Molecular interactions between some non-steroidal anti-inflammatory drugs (NSAID׳s) and bovine (BSA) or human (HSA) serum albumin estimated by means of isothermal titration calorimetry (ITC) and frontal analysis capillary electrophoresis (FA/CE). Talanta 2014; 130:241-50. [DOI: 10.1016/j.talanta.2014.06.060] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 06/19/2014] [Accepted: 06/26/2014] [Indexed: 11/16/2022]
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11
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Del Giudice A, Leggio C, Balasco N, Galantini L, Pavel NV. Ibuprofen and Propofol Cobinding Effect on Human Serum Albumin Unfolding in Urea. J Phys Chem B 2014; 118:10043-51. [DOI: 10.1021/jp504280n] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Alessandra Del Giudice
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Claudia Leggio
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Nicole Balasco
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Luciano Galantini
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Nicolae V. Pavel
- Dipartimento
di Chimica, Sapienza Università di Roma, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
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12
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Pistolozzi M, Fortugno C, Franchini C, Corbo F, Muraglia M, Roy M, Félix G, Bertucci C. Species-dependent binding of tocainide analogues to albumin: affinity chromatography and circular dichroism study. J Chromatogr B Analyt Technol Biomed Life Sci 2014; 968:69-78. [PMID: 24472243 DOI: 10.1016/j.jchromb.2014.01.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Revised: 01/02/2014] [Accepted: 01/05/2014] [Indexed: 11/25/2022]
Abstract
A series of novel tocainide analogues were characterized for their HSA and RSA binding, by using high-performance liquid affinity chromatography (HPLAC) and circular dichroism (CD). In this HPLAC study, HSA and RSA were covalently immobilized to the silica matrix of HPLC columns, with a procedure that maintained unaltered the binding properties of the proteins. The tocainide analogues were ranked for their affinity to HSA and RSA on the basis of their bound fractions measured by the two albumin-based columns. This technique was also applied to characterize the high affinity binding sites of these tocainide analogues to the protein. For this purpose displacement experiments were carried out by means of increasing concentrations in the mobile phase of competitors known to bind selectively to the main binding sites of HSA. The results obtained with the immobilized proteins were confirmed by investigating the same drug-protein systems in solution by circular dichroism. The comparison of the data collected with both methodologies highlighted the dramatic effect of small differences in the amino acidic sequences of the two proteins. In fact, despite their similar primary and secondary structures, a small difference in the amino acidic sequence leads to significant differences in their three-dimensional structure reflecting their different binding capacity and their stereoselectivity. Therefore, this study confirms how it is crucial to consider the significant differences among the animal models when performing pharmacokinetic studies. It is also clear that the knowledge of serum carrier binding parameters at an early stage of drug discovery represents a great advantage that may help to save time and efforts.
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Affiliation(s)
- Marco Pistolozzi
- School of Bioscience & Bioengineering, South China University of Technology, Higher Education Mega Center, 510006 Guangzhou, People's Republic of China
| | - Cecilia Fortugno
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Carlo Franchini
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari 'Aldo Moro', Bari, Italy
| | - Filomena Corbo
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari 'Aldo Moro', Bari, Italy
| | - Marilena Muraglia
- Dipartimento di Farmacia-Scienze del Farmaco, Università degli Studi di Bari 'Aldo Moro', Bari, Italy
| | - Myriam Roy
- Centre Interdisciplinaire de Nanoscience de Marseille (CNRS-UMR 7325), Aix-Marseille Université, France
| | - Guy Félix
- Centre Interdisciplinaire de Nanoscience de Marseille (CNRS-UMR 7325), Aix-Marseille Université, France
| | - Carlo Bertucci
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy.
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13
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Ganguly A, Paul BK, Ghosh S, Dalapati S, Guchhait N. Interaction of a potential chloride channel blocker with a model transport protein: a spectroscopic and molecular docking investigation. Phys Chem Chem Phys 2014; 16:8465-75. [DOI: 10.1039/c3cp53843e] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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15
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Ray D, Paul BK, Guchhait N. Effect of biological confinement on the photophysics and dynamics of a proton-transfer phototautomer: an exploration of excitation and emission wavelength-dependent photophysics of the protein-bound drug. Phys Chem Chem Phys 2012; 14:12182-92. [DOI: 10.1039/c2cp41292f] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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16
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Paul BK, Ray D, Guchhait N. Spectral deciphering of the interaction between an intramolecular hydrogen bonded ESIPT drug, 3,5-dichlorosalicylic acid, and a model transport protein. Phys Chem Chem Phys 2012; 14:8892-902. [DOI: 10.1039/c2cp23496c] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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17
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Circular dichroism in drug discovery and development: an abridged review. Anal Bioanal Chem 2010; 398:155-66. [DOI: 10.1007/s00216-010-3959-2] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Revised: 06/15/2010] [Accepted: 06/21/2010] [Indexed: 12/20/2022]
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18
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Galantini L, Leggio C, Konarev PV, Pavel NV. Human serum albumin binding ibuprofen: A 3D description of the unfolding pathway in urea. Biophys Chem 2010; 147:111-22. [DOI: 10.1016/j.bpc.2010.01.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Revised: 01/08/2010] [Accepted: 01/10/2010] [Indexed: 11/28/2022]
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19
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da Silveira VC, Caramori GF, Abbott MP, Gonçalves MB, Petrilli HM, da Costa Ferreira AM. Oxindole-Schiff base copper(II) complexes interactions with human serum albumin: Spectroscopic, oxidative damage, and computational studies. J Inorg Biochem 2009; 103:1331-41. [DOI: 10.1016/j.jinorgbio.2009.05.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 05/22/2009] [Accepted: 05/25/2009] [Indexed: 12/20/2022]
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20
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Use of a surface plasmon resonance method to investigate antibiotic and plasma protein interactions. Antimicrob Agents Chemother 2009; 53:1528-31. [PMID: 19164148 DOI: 10.1128/aac.00971-08] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The pharmacologic effect of an antibiotic is directly related to its unbound concentration at the site of infection. Most commercial antibiotics have been selected in part for their low propensity to interact with serum proteins. These nonspecific interactions are classically evaluated by measuring the MIC in the presence of serum. As higher-throughput technologies tend to lose information, surface plasmon resonance (SPR) is emerging as an informative medium-throughput technology for hit validation. Here we show that SPR is a useful automatic tool for quantification of the interaction of model antibiotics with serum proteins and that it delivers precise real-time kinetic data on this critical parameter.
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21
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Shortridge MD, Hage DS, Harbison GS, Powers R. Estimating protein-ligand binding affinity using high-throughput screening by NMR. JOURNAL OF COMBINATORIAL CHEMISTRY 2008; 10:948-58. [PMID: 18831571 PMCID: PMC2631241 DOI: 10.1021/cc800122m] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Many of today's drug discovery programs use high-throughput screening methods that rely on quick evaluations of protein activity to rank potential chemical leads. By monitoring biologically relevant protein-ligand interactions, NMR can provide a means to validate these discovery leads and to optimize the drug discovery process. NMR-based screens typically use a change in chemical shift or line width to detect a protein-ligand interaction. However, the relatively low throughput of current NMR screens and their high demand on sample requirements generally makes it impractical to collect complete binding curves to measure the affinity for each compound in a large and diverse chemical library. As a result, NMR ligand screens are typically limited to identifying candidates that bind to a protein and do not give any estimate of the binding affinity. To address this issue, a methodology has been developed to rank binding affinities for ligands based on NMR screens that use 1D (1)H NMR line-broadening experiments. This method was demonstrated by using it to estimate the dissociation equilibrium constants for twelve ligands with the protein human serum albumin (HSA). The results were found to give good agreement with previous affinities that have been reported for these same ligands with HSA.
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Affiliation(s)
| | - David S. Hage
- Department of Chemistry, University of Nebraska, Lincoln, NE 68588
| | | | - Robert Powers
- Department of Chemistry, University of Nebraska, Lincoln, NE 68588
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22
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Sun H, He P. Characterization of Interactions Between Fluoroquinolones and Human Serum Albumin by CE–Frontal Analysis. Chromatographia 2008. [DOI: 10.1365/s10337-008-0814-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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23
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Zhao P, Zhu G, Zhang W, Zhang L, Liang Z, Zhang Y. Study of multiple binding constants of dexamethasone with human serum albumin by capillary electrophoresis–frontal analysis and multivariate regression. Anal Bioanal Chem 2008; 393:257-61. [DOI: 10.1007/s00216-008-2373-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2008] [Revised: 08/21/2008] [Accepted: 08/25/2008] [Indexed: 11/24/2022]
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24
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Pistolozzi M, Bertucci C. Species-dependent stereoselective drug binding to albumin: A circular dichroism study. Chirality 2008; 20:552-8. [DOI: 10.1002/chir.20521] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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25
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Zhou N, Liang YZ, Wang B, Wang P, Chen X, Zeng MM. Interaction of glycyrrhetinic acid, furosemide and hydrochlorothiazide with bovine serum albumin and their displacement interactions: capillary electrophoresis and fluorescence quenching study. Biomed Chromatogr 2008; 22:223-31. [DOI: 10.1002/bmc.923] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Fitos I, Visy J, Zsila F, Mády G, Simonyi M. Conformation selectivity in the binding of diazepam and analogues to α1-acid glycoprotein. Bioorg Med Chem 2007; 15:4857-62. [PMID: 17507228 DOI: 10.1016/j.bmc.2007.04.060] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2006] [Revised: 04/19/2007] [Accepted: 04/27/2007] [Indexed: 11/30/2022]
Abstract
Diazepam, a 1,4-benzodiazepine lacking chiral centre, exists in an equimolar mixture of two chiral conformers. Induced circular dichroism spectra for the binding of diazepam and its 3,3-dimethyl substituted analogues to alpha1-acid glycoprotein (AGP) revealed that opposite to human serum albumin, AGP preferably binds the P-conformers. Accordingly, slightly favoured binding of (R)-enantiomers of 3-alkyl derivatives having P-conformation was found. In case of 3-acyloxy derivatives, however, AGP preferably binds the (S)-enantiomers. Studies with the separated genetic variants of AGP proved similar binding affinities, but markedly different conformation selectivities. For diazepam bound by the F1-S variant, a P/M selectivity of about 2 could be estimated.
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Affiliation(s)
- Ilona Fitos
- Department of Molecular Pharmacology, Institute of Biomolecular Chemistry Chemical Research Center, Hungarian Academy of Sciences, PO Box 17, H-1525 Budapest, Hungary.
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27
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Ascoli GA, Domenici E, Bertucci C. Drug binding to human serum albumin: abridged review of results obtained with high-performance liquid chromatography and circular dichroism. Chirality 2007; 18:667-79. [PMID: 16823814 DOI: 10.1002/chir.20301] [Citation(s) in RCA: 123] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The drug binding to plasma and tissue proteins are fundamental factors in determining the overall pharmacological activity of a drug. Human serum albumin (HSA), together with alpha1-acid glycoprotein (AGP), are the most important plasma proteins, which act as drug carriers, with drug pharmacokinetic implications, resulting in important clinical impacts for drugs that have a relatively narrow therapeutic index. This review focuses on the combination of biochromatography and circular dichroism as an effective approach for the characterization of albumin binding sites and their enantioselectivity. Furthermore, their applications to the study of changes in the binding properties of the protein arising by the reversible or covalent binding of drugs are discussed, and examples of physiological relevance reported. Perspectives of these studies reside in supporting the development of new drugs, which require miniaturization to facilitate the screening of classes of compounds for their binding to the target protein, and a deeper characterization of the mechanisms involved in the molecular recognition processes.
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Affiliation(s)
- Giorgio A Ascoli
- Krasnow Institute for Advanced Study and Psychology Department, George Mason University, Fairfax, VA, USA
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28
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Martínez-Gómez MA, Carril-Avilés MM, Sagrado S, Villanueva-Camañas RM, Medina-Hernández MJ. Characterization of antihistamine–human serum protein interactions by capillary electrophoresis. J Chromatogr A 2007; 1147:261-9. [PMID: 17339039 DOI: 10.1016/j.chroma.2007.02.054] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2006] [Revised: 02/14/2007] [Accepted: 02/16/2007] [Indexed: 11/25/2022]
Abstract
An important topic in the drug discovery and development process is the role of drug binding to plasma proteins. In this paper the characterization of the interaction between antihistamines (cationic drugs) towards human serum albumin (HSA) and alpha(1)-acid glycoprotein (AGP) under physiological conditions by capillary electrophoresis-frontal analysis is presented. Furthermore, the binding of these drugs to all plasma proteins is evaluated by using ultrafiltration and capillary electrophoresis. Antihistamines present a wide-ranging behaviour with respect to their affinities towards plasma proteins. Orphenadrine, phenindamine, tripelenamine and tripolidine principally bind to HSA; carbinoxamine, dimetindene and etintidine principally bind to AGP; brompheniramine, chlorpheniramine and ranitidine present an important binding to lipoproteins and/or globulins and finally, chlorcyclizine, cinarizine, cyclizine, doxylamine, hydroxyzine, perphenazine and terfenadine do not bind to lipoproteins and/or globulins but bind to HSA and AGP in different extension. The interaction of antihistamines with HSA is determined by the hydrophobicity (direct relationship) and the polar surface area (indirect relationship) of the compounds. The steric parameters and hydrogen bonding character of compounds seems to be related with the binding of antihistamines to AGP. The antihistamine-HSA affinity constants were evaluated and the K(1) values ranged from 7 x 10(2)M(-1) (for doxylamine) to 4 x 10(4)M(-1) (for phenindamine).
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Affiliation(s)
- M A Martínez-Gómez
- Departamento Química Analítica, Facultat de Farmacia, Universitat de Valencia, C/Vicent Andrés Estellés s/n, E-46100 Burjassot, Valencia, Spain
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29
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Martínez-Gómez MA, Sagrado S, Villanueva-Camañas RM, Medina-Hernández MJ. Characterization of basic drug–human serum protein interactions by capillary electrophoresis. Electrophoresis 2006; 27:3410-9. [PMID: 16944456 DOI: 10.1002/elps.200600102] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Drug-protein interactions are determining factors in the therapeutic, pharmacodynamic and toxicological drug properties. The affinity of drugs towards plasmatic proteins is apparently well established in bibliography. Albumin (HSA) especially binds neutral and negatively charged compounds; alpha(1)-acid glycoprotein (AGP) binds many cationic drugs, lipoproteins bind to nonionic and lipophilic drugs and some anionic drugs while globulins interact inappreciably with the majority of drugs. In this paper, the characterization of the interaction between cationic drugs, beta-blockers and phenotiazines towards HSA, AGP, and both HSA + AGP mixtures of proteins under physiological conditions by CE-frontal analysis is presented. Furthermore, the binding of these drugs to all plasmatic proteins is evaluated by using ultrafiltration and CE. The results indicate that the hydrophobic character of compounds seems to be the key factor on the interaction between cationic drugs towards proteins. In fact, hydrophobic basic drugs bind in great extension to HSA, while hydrophilic basic drugs present low interactions with proteins and bind especially to AGP.
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Affiliation(s)
- María A Martínez-Gómez
- Departamento de Química Analítica, Facultat de Farmacia, Universitat de Valencia, Burjassot, Valencia, Spain
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30
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Shan R, Lee KJ, Kwon BM, Lee CH. Protein binding characteristics of 2'-benzoyloxycinnamaldehyde. Drug Dev Ind Pharm 2005; 31:545-9. [PMID: 16109627 DOI: 10.1080/03639040500215651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The protein binding characteristic of 2'-Benzoyloxycinnamaldehyde (BCA) was investigated, which has demonstrated a potent antitumor effect against several human solid tumor cell lines and in human tumor xenograft nude mice. Protein binding of BCA in human serum was 86 +/- 0.91% and the predominant binding protein of BCA was fatty-acid-free human serum albumin (HSA) (81 +/- 0.91%). The binding of BCA to HSA was outlined by one class, and Ka and n of BCA were 1.65 x 10(5) M(- 1) and 0.374, respectively. Displacement studies with fluorescence probes suggested that BCA mainly binds to site I on HSA, and BCA-induced enhancement in site II binding. The limited drug-drug interaction experiments suggested that BCA influences both site I and site II drug-HSA bindings via different mechanisms; a competitive displacement and a probable allosteric conformational change in HSA, respectively.
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Affiliation(s)
- Ren Shan
- College of Pharmacy, Pusan National University, Pusan, Korea
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31
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Chen J, Fitos I, Hage DS. Chromatographic analysis of allosteric effects between ibuprofen and benzodiazepines on human serum albumin. Chirality 2005; 18:24-36. [PMID: 16278829 DOI: 10.1002/chir.20216] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The effects of (R)- and (S)-ibuprofen on the binding of benzodiazepines to human serum albumin (HSA) were examined by biointeraction chromatography. The displacement of benzodiazepines from HSA by (R)- and (S)-ibuprofen was found to involve negative allosteric interactions (or possible direct competition) for most (R)-benzodiazepines. However, (S)-benzodiazepines gave positive or negative allosteric effects and direct competition when displaced by (R)- or (S)-ibuprofen. Association equilibrium constants and coupling constants measured for these effects indicated that they involved two classes of ibuprofen binding regions (i.e., low- and high-affinity sites). Based on these results, a model was proposed to explain the binding of benzodiazepines to HSA and their interactions with ibuprofen. This model gave good agreement with previous reports examining the binding of benzodiazepines to HSA.
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Affiliation(s)
- Jianzhong Chen
- Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588, USA
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32
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Bertucci C, Cimitan S. Inhibition of drug binding to human serum albumin by cholecystographic agents. ACTA ACUST UNITED AC 2003; 58:901-8. [PMID: 13679185 DOI: 10.1016/s0014-827x(03)00148-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The binding of two cholecystographic agents to human serum albumin (HSA) was evaluated by means of two different complementary methodologies. In particular, the inhibition of drug HSA binding caused by iopanoic- and iophenoxic-acid was investigated by circular dichroism (CD) and resonant mirror (RM) optical biosensor techniques. The CD study allowed to obtain information both on the cholecystographic agent binding site and on the effect of the binding on the protein conformation. Iopanoic acid (IOP), a drug potentially useful for thyrotoxic disorders, resulted a direct competitor for ligands that selectively bind to site II, in agreement to literature data. No definite evidence was obtained for the highest affinity binding site of iophenoxic acid (IOPH), however, this diagnostic tool markedly affected the binding of ligands to the most characterized high affinity sites on HSA, namely sites I, II and III. Binding parameters were obtained by optical biosensor analysis: K(D) values were 3.6 x 10(-7) and 2.8 x 10(-8) M for IOP and IOPH, respectively.
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Affiliation(s)
- Carlo Bertucci
- Dipartimento di Scienze Farmaceutiche, Università di Bologna, via Belmeloro 6, I-40126 Bologna, Italy.
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33
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Bertucci C, Cimitan S. Rapid screening of small ligand affinity to human serum albumin by an optical biosensor. J Pharm Biomed Anal 2003; 32:707-14. [PMID: 12899961 DOI: 10.1016/s0731-7085(03)00178-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Here we report the use of IAsys biosensor technology for determining the binding parameters of low molecular weight compounds, such as warfarin and bilirubin, to surface immobilized human serum albumin. The protein was covalently immobilized on the surface of the biosensor cuvette, bearing a carboxymethyl dextran layer, through a condensing reaction between the carboxyl groups of the biosensor surface and epsilon-amine groups of protein lysine residues. This system detects and quantifies the changes in refractive index in the vicinity of the surface of the sensor chip to which the protein is immobilized. The changes in the refractive index are proportional to the change in the absorbed mass, thus the analysis allows the monitoring of the interaction process and the determination of the binding parameters. Optical biosensor analysis, most suited for studying protein/protein or protein/nucleic acid interactions, was sensitive enough to monitor the binding of low molecular weight compounds to human serum albumin and then suitable for a rapid screening of libraries of potential drugs when bioavailability is the research target.
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Affiliation(s)
- Carlo Bertucci
- Department of Pharmaceutical Sciences, University of Bologna, via Belmeloro 6, Bologna, Italy.
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34
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Il'ichev YV, Perry JL, Rüker F, Dockal M, Simon JD. Interaction of ochratoxin A with human serum albumin. Binding sites localized by competitive interactions with the native protein and its recombinant fragments. Chem Biol Interact 2002; 141:275-93. [PMID: 12385724 DOI: 10.1016/s0009-2797(02)00078-9] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Competitive interactions of ochratoxin A (OTA) and several other acidic compounds were utilized to gain insight into the localization of binding sites and the nature of binding interactions between anionic species and human serum albumin (HSA). Depolarization of OTA fluorescence in the presence of a competing anion was used to quantify ligand-protein interactions. The results obtained were rationalized in terms of OTA displacement from its major binding site. Based on their ability to displace OTA, two distinct groups of the anionic ligands were revealed. The first group contained structurally diverse compounds that shared a common binding site in subdomain IIA (Sudlow Site I). The second group consisted of three non-steroidal anti-inflammatory drugs, which showed much lower affinity to Site I than the OTA dianion. The major site for these drugs was located in domain III. Fluorescence spectroscopy measurements of OTA, warfarin (WAR) and naproxen (NAP) complexes with recombinant proteins corresponding to the domains of HSA (D1-D3) revealed binding to all domains but with different affinities. The binding constants for OTA and WAR decreased in the series D2z.Gt;D3>D1. In contrast, NAP showed the most favorable interaction with D3 and comparable affinities to the two remaining domains. The OTA binding constant for D2, 7.9 x 10(5) M(-1), was smaller than the largest constant for HSA by a factor of approximately 7. The binding constant for OTA with D3, 1.1 x 10(5) M(-1), was very close to that of the secondary binding site for HSA.
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Affiliation(s)
- Yuri V Il'ichev
- Department of Chemistry, Duke University, Durham, NC 27708, USA
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35
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Bertucci C. Enantioselective inhibition of the binding of rac-profens to human serum albumin induced by lithocholate. Chirality 2001; 13:372-8. [PMID: 11400191 DOI: 10.1002/chir.1047] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The reversible binding of lithocholate to human serum albumin determines a decrease of the binding of rac-ketoprofen. The process was followed by displacement chromatography using increasing concentrations of the competitor, i.e., lithocholate, in the mobile phase. The inhibition of rac-ketoprofen binding resulting was enantioselective and greater displacement was observed for the (S) enantiomer. The displacement process resulting was competitive in nature, the two enantiomers of ketoprofen binding to the same binding site as the modifier. The investigation was extended to other nonsteroidal antiinflammatory drugs. The enantioselective binding inhibition was larger in the case of rac-naproxen and rac-suprofen with respect to the phenomenon observed in the case of rac-ketoprofen. The difference in circular dichroism spectroscopy was also used to characterize the binding of lithocholate to human serum albumin. This bile acid was proven to bind to site II on human serum albumin. The results, as obtained by displacement chromatography and difference circular dichroism spectroscopy, strongly support the hypothesized role of bile acids in inducing the enantioselective inhibition of ketoprofen binding to human serum albumin in patients suffering from liver diseases.
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Affiliation(s)
- C Bertucci
- Dipartimento di Scienze Farmaceutiche, Università di Bologna, 40126 Bologna, Italy.
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36
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Bertucci C, Barsotti MC, Raffaelli A, Salvadori P. Binding properties of human albumin modified by covalent binding of penicillin. BIOCHIMICA ET BIOPHYSICA ACTA 2001; 1544:386-92. [PMID: 11341948 DOI: 10.1016/s0167-4838(00)00253-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Derivatisation of lysine residues in human albumin was performed in vitro by reaction with penicillin G. This modification reaction has been reported to occur in patients treated with high dosages of the antibiotic. The structure of the modified protein was characterised by mass spectrometry and circular dichroism. The number of the lysine residues involved depends on the time of incubation and on the drug/protein molar ratio. The secondary structure of the modified protein does not change significantly with respect to the native protein. Furthermore, the binding properties of the modified albumin were characterised by CD spectroscopy. Phenylbutazone, diazepam and bilirubin, known to bind to specific binding areas, were used as markers. A decrease of the affinity to the high-affinity binding sites was observed after the modification.
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Affiliation(s)
- C Bertucci
- Centro Studio C.N.R. Macromolecole Stereoordinate ed Otticamente Attive, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Risorgimento 35, 56126, Pisa, Italy
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37
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Abstract
The reversible binding of ethacrynic acid was characterized by a difference circular dichroism method. A 2/1 stoichiometry was determined for the [drug]/[HSA] (human serum albumin) complex. The reversible binding of ethacrynic acid to HSA determines direct competition with ligands that selectivity bind to site II and to the fatty acid site. Furthermore, indirect competition was shown for ligands for site I (anti-cooperative) and to site III (cooperative).
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Affiliation(s)
- C Bertucci
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Italy
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38
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Parikh HH, McElwain K, Balasubramanian V, Leung W, Wong D, Morris ME, Ramanathan M. A rapid spectrofluorimetric technique for determining drug-serum protein binding suitable for high-throughput screening. Pharm Res 2000; 17:632-7. [PMID: 10888318 DOI: 10.1023/a:1007537520620] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
PURPOSE To develop and validate a rapid method for determining the dissociation constants with which pharmaceutical candidates and drugs bind to serum albumin and to alpha1-acid glycoprotein with the goal of deducing the extent of binding. METHODS The quenching of the intrinsic tryptophan fluorescence of serum albumin and alpha1-acid glycoprotein was monitored by spectrofluorimetry and the data were used to calculate the apparent dissociation constant. Sodium warfarin was used to probe the warfarin-binding site of serum albumin and diazepam was used to probe the benzodiazepine binding site. Additionally, the binding of sodium salicylate, phenylbutazone, sulfinpyrazone, iophenoxic acid, theophylline, chloramphenicol, acetaminophen, lithium chloride and ampicillin were also investigated. Chlorpromazine hydrochloride and imipramine hydrochloride were used as probes for alpha1-acid glycoprotein. The assays were also extended to the multiwell format. The quenching curves were fitted to the quadratic binding equation to determine the dissociation constants. RESULTS Intrinsic fluorescence measurements are an excellent predictor of the drug binding to human serum albumin and to alpha1-acid glycoprotein. These measurements detect binding to the warfarin and benzodiazepine binding sites of human serum albumin. The dissociation constants estimated using the method compare favorably to the dissociation constants previously reported by Epps et al. using extrinsic fluorescence methodology, and the results correlate well with equilibrium dialysis using drug displacement endpoints. CONCLUSIONS These measurements can be carried out with small samples and do not require separation of the bound and unbound species. Additionally, the proposed methods eliminate membrane separations, are not compound specific and do not require analytical chromatography or mass spectrometry for quantitation. Spectrofluorimetry may prove to be a useful method for rapidly determining the protein binding of combinatorial libraries.
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Affiliation(s)
- H H Parikh
- Department of Pharmaceutics, State University of New York at Buffalo, 14260-1200, USA
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39
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Luo RS, Liu ML, Mao XA. NMR diffusion and relaxation study of drug-protein interaction. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 1999; 55A:1897-1901. [PMID: 10474906 DOI: 10.1016/s1386-1425(99)00052-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In this work, NMR diffusion and relaxation measurements are applied to the study of the interaction between the anti-inflammatory drug salicylate and the human serum albumin (HSA) in solutions. The self-diffusion coefficients and the spin-lattice relaxation rates of salicylate are measured as a function of the concentration. The dissociation constant, Kd, for drug/HSA complexes and the number of binding sites, n, are evaluated.
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40
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Fitos I, Visy J, Simonyi M, Hermansson J. Stereoselective allosteric binding interaction on human serum albumin between ibuprofen and lorazepam acetate. Chirality 1999; 11:115-20. [PMID: 9951402 DOI: 10.1002/(sici)1520-636x(1999)11:2<115::aid-chir6>3.0.co;2-r] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The effect of ibuprofen enantiomers on the stereoselective binding of 3-acyloxy-1,4-benzodiazepines to human serum albumin (HSA) was studied using both native and Sepharose-immobilized protein. (S)-Lorazepam acetate exhibited considerably enhanced binding, especially in the presence of (+)-(S)-ibuprofen. The phenomenon is an indication of cooperative allosteric interaction between different binding sites during multiple cobinding of two ligands.
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Affiliation(s)
- I Fitos
- Institute of Chemistry, Hungarian Academy of Sciences, Budapest, Hungary.
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41
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Russeva V, Zhivkova Z, Prodanova K, Rakovska R. Protein binding of piroxicam studied by means of affinity chromatography and circular dichroism. J Pharm Pharmacol 1999; 51:49-52. [PMID: 10197417 DOI: 10.1211/0022357991772088] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
The protein binding of piroxicam, a widely used non-steroidal anti-inflammatory drug has been investigated by high-performance liquid affinity chromatography, with phenylbutazone and diazepam used as markers for binding-site characterization, and by circular dichroism titration. It was found that piroxicam binds to high-affinity phenylbutazone-binding sites and to high-affinity diazepam-binding sites. No binding to the low-affinity sites of either marker was established. High values of the primary (high-affinity) binding constants corresponding to both types of binding site were obtained by means of a mathematical method cited in the literature. The circular dichroic spectra of piroxicam were studied at a given albumin concentration and various drug concentrations. A new Cotton effect was observed and was ascribed to the binding of piroxicam to the protein molecule. The values of differential molar ellipticity (delta theta) were treated by a new mathematical procedure for analysis of the data obtained. A high affinity constant was calculated for one class of binding site. Its value is in good agreement with the values obtained by affinity chromatography. These results reveal that circular dichroism is an acceptable method for investigation of protein binding.
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Affiliation(s)
- V Russeva
- Department of Chemistry, Faculty of Pharmacy, Medical University, Sofia, Bulgaria
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42
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Bertucci C, Nanni B, Raffaelli A, Salvadori P. Chemical modification of human albumin at cys34 by ethacrynic acid: structural characterisation and binding properties. J Pharm Biomed Anal 1998; 18:127-36. [PMID: 9863950 DOI: 10.1016/s0731-7085(98)00163-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Derivatization of the free cys3,4 in human albumin, which is reported to occur under physiological conditions, has been performed in vitro by reaction of the protein with ethacrynic acid. This modification has been investigated by mass spectrometry and circular dichroism. Ethacrynic acid has been proven to bind human albumin either covalently and non-covalently. This post-translational modification does not determine significant changes in the secondary structure of the protein, as shown by the comparable circular dichroism spectra of the native and the modified proteins. Furthermore, the binding properties of the human albumin samples have been investigated by circular dichroism and equilibrium dialysis. The affinity to the higher affinity binding sites does not change either for drugs binding to site I, like phenylbutazone, or to site II, like diazepam, while a small but significant increase has been observed for bilirubin, known to bind to site III. Nevertheless significant decreases of the affinity at the lower affinity binding sites of the modified protein were observed for both drugs binding to site I or to site II.
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Affiliation(s)
- C Bertucci
- Centro Studio C.N.R. Macromolecole Stereoordinate ed Otticamente Attive, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Italy
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Zhivkova ZD, Russeva VN. Stereoselective binding of ketoprofen enantiomers to human serum albumin studied by high-performance liquid affinity chromatography. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1998; 714:277-83. [PMID: 9766867 DOI: 10.1016/s0378-4347(98)00211-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
A chiral stationary phase based on immobilized human serum albumin (HSA) was used to study the stereoselective binding of ketoprofen enantiomers by means of high-performance liquid affinity chromatography. The technique of zonal elution was applied together with a novel mathematical approach describing attachment to more than one type of binding site. Phenylbutazon (PBZ) and diazepam (DAZ) were used as markers for the major believed binding regions on HSA. Both R- and S-ketoprofen (KTR and KTS) display high affinity to the primary PBZ- and DAZ-binding sites and low-affinity to the secondary DAZ sites. The binding to high-affinity regions is accepted to be a stepwise process initiated by the binding to the primary DAZ sites and followed by the attachment to the primary PBZ sites. The chiral recognition is attributed to the high-affinity PBZ-binding sites and to the low-affinity DAZ-binding sites.
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Affiliation(s)
- Z D Zhivkova
- Department of Chemistry, Faculty of Pharmacy, Medical University, Sofia, Bulgaria
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Ascoli GA, Bertucci C, Salvadori P. Ligand binding to a human serum albumin stationary phase: use of same-drug competition to discriminate pharmacologically relevant interactions. Biomed Chromatogr 1998; 12:248-54. [PMID: 9787894 DOI: 10.1002/(sici)1099-0801(199809/10)12:5<248::aid-bmc742>3.0.co;2-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A technique based on a human serum albumin (HSA) stationary phase high-pressure liquid chromatography (HPLC) has been successfully used for the past few years to characterize the interactions between HSA and new substrates. Immobilized HSA conserves the binding properties of the protein in solution, allowing fast and reliable analyses of binding interactions. Nevertheless, clear evidence that all binding mechanisms of HSA-HPLC are pharmacologically relevant is so far lacking. In particular, non-stoichiometric interactions of injected ligands with stationary phase components such as silica and the amino acid medium (other than protein binding areas) might interfere with the correlation between chromatographic retention and HSA binding. Here we present a quantitative method to distinguish between the molecular interactions of a ligand with binding areas of potential pharmacological interest and other, non-saturable binding mechanisms. Such a method, based on HPLC same-ligand displacement, is simple and reliable, as confirmed by in situ protein denaturation. Consequently, we were able to distinguish between different types of competitions detected in the co-binding of two drugs to HSA.
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Affiliation(s)
- G A Ascoli
- Centro Studio C.N.R. Macromolecole Stereordinate ed Otticamento Attive, Università di Pisa, Italy
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45
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Russeva VN, Zhivkova ZD. Albumin binding sites studied by high-performance liquid affinity chromatography. Int J Pharm 1998. [DOI: 10.1016/s0378-5173(98)00084-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhivkova Z, Russeva V. New mathematical approach for the evaluation of drug binding to human serum albumin by high-performance liquid affinity chromatography. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1998; 707:143-9. [PMID: 9613943 DOI: 10.1016/s0378-4347(97)00586-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A novel mathematical approach for investigation of drug-human serum albumin (HSA) interactions by means of high-performance liquid affinity chromatography is developed. The model is based on the assumption that two types of competitive binding sites exist on the HSA molecule. The widely used single-site binding equation is extended and a proper mathematical analysis is proposed allowing the determination of the major parameters characterizing the multisite binding (cobinding) process. The utility of the new approach is proved by competitive studies on HSA binding of two model drugs, diazepam and diclofenac.
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Affiliation(s)
- Z Zhivkova
- Department of Chemistry, Faculty of Pharmacy, Medical University, Solia, Bulgaria
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McDonnell PA, Caldwell GW, Masucci JA. Using capillary electrophoresis/frontal analysis to screen drugs interacting with human serum proteins. Electrophoresis 1998; 19:448-54. [PMID: 9551800 DOI: 10.1002/elps.1150190315] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We have used capillary electrophoresis in the frontal analysis mode (CE/FA) to determine the binding capacity of beta-adrenoceptor blocking drugs to individual serum proteins, serum protein mixtures and human serum. The free drug concentration was directly measured from the height of the frontal peak and used to calculate the bound drug concentration. From the bound drug concentration, the percentage of drug bound to the serum proteins alpha1-acid glycoprotein (AGP) and human serum albumin (HSA) was then determined. In addition to determining the percent of a drug bound to a protein, the drug-protein association constant (Ka) was determined for AGP binding to beta-blockers. The data-estimated association constants were consistent with literature values. The CE/FA studies on the beta-adrenoceptor blocking drugs and the serum proteins indicated that HSA, AGP, high density lipoprotein (HDL), and low density lipoprotein (LDL) were the main contributors to serum binding for this series of compounds. The serum-drug binding data sorted the beta-adrenoceptor blocking drugs into high and low binding categories. The protein mixture (AGP + HSA + HDL + LDL) resulted in dividing the beta-blockers into the same high/low rankings. The protein mixture (AGP + HSA + HDL + LDL) was amenable to automation, did not autoaggregate, and had constant concentrations for the proteins.
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Affiliation(s)
- P A McDonnell
- The R. W. Johnson Pharmaceutical Research Institute, Spring House, PA 19477, USA.
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Bagatolli LA, Kivatinitz SC, Fidelio GD. Interaction of small ligands with human serum albumin IIIA subdomain. How to determine the affinity constant using an easy steady state fluorescent method. J Pharm Sci 1996; 85:1131-2. [PMID: 8897285 DOI: 10.1021/js960142k] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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49
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Olson RE, Christ DD. Chapter 33. Plasma Protein Binding of Drugs. ANNUAL REPORTS IN MEDICINAL CHEMISTRY 1996. [DOI: 10.1016/s0065-7743(08)60472-8] [Citation(s) in RCA: 195] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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