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Saboury AA, Shamsaei AA, Moosavi-Movahedi AA, Mansuri-Torshizi H. Thermodynamics of Binding 2,2′-Bipyridineglycinato Palladium (II) Chloride on Human Serum Albumin. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199900125] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Yoo MJ, Hage DS. Use of peak decay analysis and affinity microcolumns containing silica monoliths for rapid determination of drug-protein dissociation rates. J Chromatogr A 2010; 1218:2072-8. [PMID: 20956006 DOI: 10.1016/j.chroma.2010.09.070] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Revised: 08/30/2010] [Accepted: 09/27/2010] [Indexed: 10/19/2022]
Abstract
This report examined the use of silica monoliths in affinity microcolumns containing human serum albumin (HSA) to measure the dissociation rates for various drugs from this protein. Immobilized HSA and control monolith columns with dimensions of 1 mm × 4.6 mm i.d. were prepared for this work and used with a noncompetitive peak decay method. Several drugs known to bind HSA were examined, such as warfarin, diazepam, imipramine, acetohexamide, and tolbutamide. Items that were studied and optimized in this method included the sample volume, sample concentration, and elution flow rate. It was found that flow rates up to 10 mL/min could be used in this approach. Work with HSA silica monoliths at these high flow rates made it possible to provide dissociation rate constants for drugs such as warfarin in less than 40s. The dissociation rate constants that were measured gave good agreement with values reported in the literature or that had been obtained with other solutes that had similar binding affinities for HSA. This approach is a general one that should be useful in examining the dissociation of other drugs from HSA and in providing a high-throughput method for screening drug-protein interactions.
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Affiliation(s)
- Michelle J Yoo
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA
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Saboury AA, Zolghadri S, Haghbeen K, Moosavi-Movahedi AA. The inhibitory effect of benzenethiol on the cresolase and catecholase activities of mushroom tyrosinase. J Enzyme Inhib Med Chem 2008; 21:711-7. [PMID: 17252944 DOI: 10.1080/14756360600810787] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
The inhibitory effect of benzenethiol on the cresolase and catecholase activities of mushroom tyrosinase (MT) have been investigated at two temperatures of 20 and 30 degrees C in 10 mM phosphate buffer solution, pHs 5.3 and 6.8. The results show that benzenethiol can inhibit both activities of mushroom tyrosinase competitively. The inhibitory effect of benzenethiol on the cresolase activity is more than the catecholase activity of MT. The inhibition constant (K(i)) value at pH 5.3 is smaller than that at pH 6.8 for both enzyme activities. However, the K(i) value increases in cresolase activity and decreases in catecholase activity due to the increase of temperature from 20 to 30 degrees C at both pHs. Moreover, the effect of temperature on K(i) value is more at pH 6.8 for both cresolase and catecholase activities. The type of binding process is different in the two types of MT activities. The binding process for catecholase inhibition is only entropy driven, which means that the predominant interaction in the active site of the enzyme is hydrophobic, meanwhile the electrostatic interaction can be important for cresolase inhibition due to the enthalpy driven binding process. Fluorescence and circular studies also show a minor change in the tertiary structure, without any change in the secondary structure, of the enzyme due to the electrostatic interaction in cresolase inhibition by benzenethiol at acidic pH.
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Affiliation(s)
- A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
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Sarnatskaya VV, Yushko LA, Sakhno LA, Nikolaev VG, Nikolaev AV, Grinenko DV, Mikhalovsky SV. New approaches to the removal of protein-bound toxins from blood plasma of uremic patients. ACTA ACUST UNITED AC 2007; 35:287-308. [PMID: 17573628 DOI: 10.1080/10731190701378618] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The article is devoted to the theoretical aspects of the development of the effective method for the removal of protein-bound uremic toxins. It is shown that the methods of flow and differential scanning microcalorimetry are sufficient enough for the evaluation of the degree of ligand loading of human serum albumin with protein-bound uremic toxins. The molecules of albumin isolated from blood plasma of the patients being kept on chronic dialysis are demonstrating significant alterations of conformation and complex-forming properties, the correction of which by conventional methods of extracorporeal detoxification (exhaustive dialysis, treatment on synthetic SCN carbons) are practically ineffective. Deliganding of uremic albumin may be successfully performed on conventional carbon haemosorbents upon preliminary separation of blood plasma and its dilution with acetate buffer 1:1 at pH = 5.08. Treatment of the whole blood of patients onto new mass-fractal deliganding carbon, i.e., hemosorbents of HSGD trademark. These HSGD haemosorbents quite effectively could be used for restoration of main parameters of uremic HAS molecules conformation and ligand-binding activity simultaneously with hemodialysis upon the protection by locally performed citrate anticoagulation as an easier and cheaper method for the removal of protein-bound uremic toxins.
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Affiliation(s)
- V V Sarnatskaya
- R.E. Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology NAS of Ukraine, Kiev, Ukraine.
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Sarnatskaya VV, Lindup WE, Ivanov AI, Yushko LA, Tjia J, Maslenny VN, Gurina NM, Nikolaev VG. Extraction of Uraemic Toxins with Activated Carbon Restores the Functional Properties of Albumin. ACTA ACUST UNITED AC 2003; 95:p10-8. [PMID: 14520007 DOI: 10.1159/000073024] [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: 11/19/2022]
Abstract
BACKGROUND Previous work has demonstrated that a partial normalization of the conformation of albumin from uraemic plasma and a substantial restoration of its binding abilities can be achieved by extraction with activated charcoal. This is best achieved at pH 3, but exposure of whole plasma to this low pH leads to the loss of some essential components. METHODS The melting curves and ligand-binding abilities of uraemic albumin have been investigated after extraction with a new generation of activated carbon at three pH values (7.2, 3.0 and 5.08). RESULTS Albumin isolated from uraemic plasma had a characteristically increased melting temperature because of bound ligands. Extraction of uraemic plasma at pH 7.2, 5.08 and 3.0 induced low-temperature shifts of albumin thermo-adsorption maximum T1 of 1.4, 3.8, 2.4 degrees C and T2 of 0.8, 3.9 and 1.2 degrees C, respectively. Flow microcalorimetry data demonstrated a decrease in the ability of uraemic albumin to bind octanoate, phenol red, salicylic acid, warfarin and diazepam. Purification of uraemic plasma at pH 5.08 completely restored the binding affinity of albumin for all the marker ligands. CONCLUSIONS Highly efficient activated carbons, with clinically feasible acidification of plasma, can remove strongly albumin-bound uraemic toxins. Investigation of the melting curve of the isolated albumin is a new biophysical way to monitor both its molecular condition and the extent of removal of protein-bound toxins by dialysis. The melting curve provides new qualitative and quantitative information about albumin in an analogous way to an electrocardiogram and the heart.
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Affiliation(s)
- Veronika V Sarnatskaya
- Section of Artificial Organs, Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology of The National Academy of Sciences, Kiev, Ukraine
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Sarnatskaya VV, Lindup WE, Niwa T, Ivanov AI, Yushko LA, Tjia J, Maslenny VN, Korneeva LN, Nikolaev VG. Effect of protein-bound uraemic toxins on the thermodynamic characteristics of human albumin. Biochem Pharmacol 2002; 63:1287-96. [PMID: 11960605 DOI: 10.1016/s0006-2952(02)00869-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The ability of albumin to bind drugs and other lipophilic organic acids is decreased in chronic renal failure by the accumulation of albumin-bound uraemic toxins such as hippuric acid, indoxyl sulphate and 3-carboxy-4-methyl-5-propyl-2-furanpropanoic acid (CMPF). This furan acid is the most highly bound and is not removed by haemodialysis. The inhibitory effects of these three uraemic toxins on the interaction of three marker ligands sodium octanoate (for medium chain fatty acids), salicylic acid and phenol red (bilirubin site/site I) with albumin have been investigated by differential scanning microcalorimetry and flow microcalorimetry. CMPF was the most potent inhibitor and its binding site coincided with that of bilirubin (site I). Indoxyl sulphate binds to the site for medium-chain fatty acids and tryptophan (site II) and hippuric acid, the weakest inhibitor, inhibited binding to the salicylic acid site.
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Affiliation(s)
- Veronika V Sarnatskaya
- Section of Artificial Organs, Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology, The National Academy of Sciences, 45 Vasilkovskaya Street, Kiev 03022, Ukraine
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Sarnatskaya VV, Lindup WE, Walther P, Maslenny VN, Yushko LA, Sidorenko AS, Nikolaev AV, Nikolaev VG. Albumin, bilirubin, and activated carbon: new edges of an old triangle. ARTIFICIAL CELLS, BLOOD SUBSTITUTES, AND IMMOBILIZATION BIOTECHNOLOGY 2002; 30:113-26. [PMID: 12027227 DOI: 10.1081/bio-120003192] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The problem of interaction of human serum albumin (HSA), unconjugated bilirubin (UB) and high porosity activated HSGD carbons is investigated in this study. The decrease of UB to HSA molecular ratio by more than 300 times was demonstrated while the batch experiments in HSA-UB admixtures after contact with HSGD. HSGD carbons express extremely high activity for the removal of UB from HSA containing solutions (more than 100 mg of UB per 1 g of activated carbon). Ex-tempore albumin-coating of carbon surface decreases adsorbent capacity by bilirubin on 21%. At the same time ex-tempore albumin-coating of HSGD carbon surface as well as blood citratization prevent platelet and leukocytes loss and clotting inside of the column. Pharmacopoeia solution of HSA containing acetyl-tryptophan or octanoate used for albumin-coating of HSGD adsorbents, becomes ligand-free and rather more active in complexing with protein-bound substances. Combination of albumin-coated HSGD carbon as haemosorbent with HSA ligand-free solution as a transfusion media seems a new prospective modality of the extracorporeal removal of protein-bound toxins.
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Affiliation(s)
- Veronika V Sarnatskaya
- Department of Artificial Organs, R. E. Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology, National Academy of Sciences, Kiev, Ukraine.
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Yuan H, Pawliszyn J. Application of solid-phase microextraction in the determination of diazepam binding to human serum albumin. Anal Chem 2001; 73:4410-6. [PMID: 11575786 DOI: 10.1021/ac010227s] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper, protein-drug interactions were studied by solid-phase microextraction (SPME) using diazepam binding to human serum albumin as a model system. Since drug compounds are normally polar and nonvolatile by nature, direct SPME is used in this work. The SPME extraction is an equilibrium process among the concentrations of the analyte partitioned onto the SPME fiber, free and bound drug in the solution. A calibration curve was first constructed by employing the amount of the analytes partitioned on the fiber versus the free analyte concentration in the solution in the absence of protein. In method I, the extraction was performed in the protein solution with known diazepam concentration. In method II, diazepam was first loaded onto the fiber by extracting in solution with known diazepam concentration. This fiber was subsequently transferred into the protein solution for desorption. The amount of the analyte left on the fiber was analyzed after the system reached equilibrium. The free drug concentration was then obtained from the calibration curve for both methods. The Scatchard plot was finally employed to obtain the number of binding sites and the equilibrium binding constants. Since only a very small amount of the protein solution is required (150 microL for each extraction), method II is very useful for circumstances where the protein amount is very limited. The direct measurement method proposed in this paper does not need a GC response factor, which significantly decreases the experimental error. The only measurement needed is the area count change (ratio) of the fiber injections before and after the protein was introduced into the solution. The difference between the direct measurement method for method I and method II is discussed. The result illustrated that the SPME direct measurement method provided both theoretical accuracy and simplicity in such applications.
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Affiliation(s)
- H Yuan
- Department of Chemistry, University of Waterloo, Ontario, Canada
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Tchiakpé L, Airaudo CB, Abdelmalik OM, Gayte-Sorbier A, Verdier M, Guerri J. Stedim 6 and Clearflex, two new multilayer materials for infusion containers. Comparative study of their compatibility with five drugs versus glass flasks and polyvinyl chloride bags. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 1996; 7:199-206. [PMID: 7577823 DOI: 10.1163/156856295x00247] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Stedim 6 and Clearflex, two new polyethylene-lined materials for infusion bags, were studied for their compatibility with disodium clodronate, chlorpromazine and maprotiline hydrochlorides, diazepam, and clorazepate dipotassium salt, comparatively with borosilicate glass flasks and polyvinyl chloride bags. Diazepam, the only drug to exhibit a marked sorption in PVC bags (the loss reached 25% of the initial concentration after a contact duration of 72 h), showed lower sorption in Stedim 6 bags (loss about 11% under the same conditions) and none in Clearflex bags. No significant difference was observed between the infusion solutions used as vehicles of the drugs (5% dextrose and 0.9% sodium chloride isotonic solutions). The results are discussed in terms of lipophilicity of the drugs and crystallinity of the polymers.
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Affiliation(s)
- L Tchiakpé
- Laboratory of Biotechnical Pharmacy, Faculty of Pharmacy, Marseilles, France
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Nikolaev V, Sarnatskaya V, von Appen K, Ivanov A, Rotellar E, Haspar M, Klinkmann H. Biophysical studies on the correction of uremic human serum albumin binding defects by in vitro charcoal adsorption treatment. Artif Organs 1996; 20:17-23. [PMID: 8645124 DOI: 10.1111/j.1525-1594.1996.tb04413.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Spectrofluorimetry, flow microcalorimetry, and differential scanning microcalorimetry (DSMC) were used to study the conformation, binding function, and ligand loading of uremic albumin obtained from the blood plasma of 2 end-stage renal disease (ESRD) patients before and after charcoal plasma treatment at different pH values (3.0-9.0). The spectrofluorimetric patterns of conformational N-F transition at low pH (4.2-3.5) are practically identical for both samples of uremic human serum albumin (HSA) and control HSA from healthy donors. After the charcoal treatment at pH 3.0 and 4.0, the enthalpies of complexing on uremic HSA with bromsulfalein and sodium dodecylsulfate approach that of donor HSA. The binding affinity of uremic HSA for sodium octanoate, phenol red, and salicylic acid following low pH charcoal treatment even exceed those of donor HSA. At the same time the charcoal treatment of uremic plasma at neutral and alkaline pH does not notably improve the binding characteristics of isolated HSA. Adsorption at low pH values completely restores the tryptophan fluorescence spectrum position of uremic albumin and improves the thermodynamic characteristics of its melting process. Using DSMC data, it can nevertheless be concluded that some conformational changes or a certain amount of high-affinity bound endogenous ligands still remain after low pH uremic HSA purification. The latter conclusion requires additional improvements of adsorption treatment of uremic plasma.
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Affiliation(s)
- V Nikolaev
- Institute of Experimental Pathology, Oncology and Radiobiology, Academy of Sciences, Kiev, Ukraine
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11
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Sarnatskaya VV, Nikolaev VG, Osipova LA, Ivanov AI, Maslenny VN, Ivanyuk AA, Yushko LA. Peritoneal dialysis for the removal of protein-bound markers of hepatic insufficiency. Artif Organs 1993; 17:828-36. [PMID: 8274100 DOI: 10.1111/j.1525-1594.1993.tb00390.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The addition of human serum albumin (HSA) to peritoneal dialysate increases the clearance of bilirubin in rats suffering from obstructive jaundice. The acceptor properties of the fluid can be enhanced by using HSA that does not contain standard stabilizing additives and has been purified by further adsorption on activated carbon. Bilirubin-containing dialysate fluid, as well as the ascitic fluid of cirrhotic patients, can be regenerated by a combination of membrane ultrafiltration and carbon adsorption. These observations suggest a potentially useful scheme for continuous, regenerative peritoneal dialysis in the treatment of hepatic insufficiency.
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Affiliation(s)
- V V Sarnatskaya
- Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology, Academy of Sciences of Ukraine, Kiev
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Bianchi C, Airaudo CB, Gayte-Sorbier A. Sorption studies of dipotassium clorazepate salt (Tranxène) and midazolam hydrochloride (Hypnovel) in polyvinyl chloride and glass infusion containers. J Clin Pharm Ther 1992; 17:223-7. [PMID: 1429915 DOI: 10.1111/j.1365-2710.1992.tb01296.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The compatibilities of dipotassium clorazepate and midazolam hydrochloride with polyvinyl chloride (PVC) bags have been studied and compared with those observed with glass flasks. At room temperature, dipotassium clorazepate showed chemical instability which was independent of the container. At 4 degrees C, dipotassium clorazepate showed no decrease in concentration over 12 h, both in 5% dextrose solution and 0.9% sodium chloride solutions. When stored for longer periods of up to 72 h, a slight decrease not exceeding 5% was observed. The compatibility of midazolam with the PVC bags was found to be good at room temperature. It was slightly better in 5% dextrose solution than in 0.9% sodium chloride solution. High sorption of the drug was observed at pH 7.0 when the primary ring structure is maintained. The results make it possible for the hospital pharmacist to prepare dipotassium chlorazepate salt and midazolam admixtures up to 3 days before administration, provided the former are stocked in a refrigerator and the latter are prepared in dextrose isotonic solutions.
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Affiliation(s)
- C Bianchi
- Pharmacy of Centre Hospitalier Spécialisé Valvert, Marseilles, France
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Squella JA, Becerra R, Nunez-Vergara LJ. Polarography: a new tool in the elucidation of drug-albumin interactions. Biochem Pharmacol 1987; 36:3531-3. [PMID: 2890353 DOI: 10.1016/0006-2952(87)90337-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- J A Squella
- Electrochemistry Laboratory, Facultad de Ciencias Quimicas y Farmaceuticas, Universidad de Chile, Santiago
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Squella J, Papic E, Nuñez-Vergara L. The chlordiazepoxide-albumin binding a bioelectrochemical approach. ACTA ACUST UNITED AC 1986. [DOI: 10.1016/0302-4598(86)80068-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Janssen LH, Dröge JH, Durlinger FC, Fruytier FJ. The pH dependence of the thermodynamics of the interaction of diazepam with human serum albumin. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(17)39047-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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16
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Foddai C, Ganadu ML, Crisponi G. A study on the binding of diazepam to serum albumins by T1 NMR measurements. Biochem Pharmacol 1983; 32:3241-3. [PMID: 6639688 DOI: 10.1016/0006-2952(83)90210-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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17
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Coassolo P, Valentin M, Bourdeaux M, Briand C. Modification of human serum albumin binding of methotrexate by folinic acid and certain drugs used in cancer chemotherapy. Eur J Clin Pharmacol 1980; 17:123-7. [PMID: 6966221 DOI: 10.1007/bf00562620] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The binding of methotrexate (MTX) and citrovorum factor (CF) to human serum albumin (HSA) was investigated. The affinity constant for MTX was 820 M-1, with 2 binding sites, and for CF 2340 M-1, with 1.5 binding sites. MTX and CF, which are used together in high dose therapy, compete for HSA binding. Competition for HSA binding between MTX and adriamycin, bleomycin and cyclophosphamide, drugs often used in association with MTX in cancer chemotherapy, was also demonstrated. The clinical importance of such competition depends on the drug/protein concentration ratio which is extremely variable.
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