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Kolli AR. Deriving protein binding-corrected chemical concentrations for in vitro testing. Clin Transl Sci 2023; 16:2123-2129. [PMID: 37605430 PMCID: PMC10651662 DOI: 10.1111/cts.13616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 08/07/2023] [Accepted: 08/14/2023] [Indexed: 08/23/2023] Open
Abstract
Extracellular chemical concentrations are considered physiologically relevant for in vitro testing and are evaluated in traditional in vitro systems using cell culture media containing 5%-10% fetal bovine serum (FBS). However, depending on the physicochemical properties, and in vitro testing conditions, cells could be exposed to variable unbound extracellular concentrations. If in vitro unbound concentrations are not calculated, it is challenging to distinguish the chemical potency and concentration-driven responses. In this study, one- and two-protein binding models were used to estimate protein binding corrected chemical concentrations of various chemicals for in vitro testing. As ceftizoxime, moxifloxacin, and nicotine have low protein binding affinity, the in vitro protein binding in 5%-10% FBS is less than 5% and can be considered negligible. However, protein binding of moderate and highly protein-bound chemicals must be corrected for as the in vitro unbound concentrations in 5%-10% FBS containing cell culture media will vary over a range of chemical concentrations. In vitro pharmacological and toxicological assessments must incorporate protein binding-adjusted in vitro concentrations to ensure physiologically relevant exposures. A user-friendly Excel spreadsheet is provided to help bench scientists calculate protein binding-corrected chemical concentrations for in vitro testing.
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Humphreys SC, Davis JA, Iqbal S, Kamel A, Kulmatycki K, Lao Y, Liu X, Rodgers J, Snoeys J, Vigil A, Weng Y, Wiethoff CM, Wittwer MB. Considerations and recommendations for assessment of plasma protein binding and drug-drug interactions for siRNA therapeutics. Nucleic Acids Res 2022; 50:6020-6037. [PMID: 35687098 PMCID: PMC9226521 DOI: 10.1093/nar/gkac456] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 04/25/2022] [Accepted: 06/06/2022] [Indexed: 11/12/2022] Open
Abstract
At the time of writing, although siRNA therapeutics are approved for human use, no official regulatory guidance specific to this modality is available. In the absence of guidance, preclinical development for siRNA followed a hybrid of the small molecule and biologics guidance documents. However, siRNA differs significantly from small molecules and protein-based biologics in its physicochemical, absorption, distribution, metabolism and excretion properties, and its mechanism of action. Consequently, certain reports typically included in filing packages for small molecule or biologics may benefit from adaption, or even omission, from an siRNA filing. In this white paper, members of the 'siRNA working group' in the IQ Consortium compile a list of reports included in approved siRNA filing packages and discuss the relevance of two in vitro reports-the plasma protein binding evaluation and the drug-drug interaction risk assessment-to support siRNA regulatory filings. Publicly available siRNA approval packages and the literature were systematically reviewed to examine the role of siRNA plasma protein binding and drug-drug interactions in understanding pharmacokinetic/pharmacodynamic relationships, safety and translation. The findings are summarized into two decision trees to help guide industry decide when in vitro siRNA plasma protein binding and drug-drug interaction studies are warranted.
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Affiliation(s)
| | - John A Davis
- PKS Department, Novartis, Cambridge, MA 02139, USA
| | | | - Amin Kamel
- Global DMPK, Takeda, San Diego, CA 92121, USA
| | | | - Yanbin Lao
- DMPK, Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, NJ 08648, USA
| | - Xiumin Liu
- Early Development, Alnylam Pharmaceuticals, Inc., Cambridge, MA 02142, USA
| | - John Rodgers
- PKDM Department, Amgen Inc., South San Francisco, CA 94080, USA
| | - Jan Snoeys
- DMPK Department, Janssen R&D, Beerse 2340, Belgium
| | - Adam Vigil
- DMPK, Boehringer Ingelheim Pharmaceuticals Inc., Ridgefield, CT 06877, USA
| | - Yan Weng
- Early Clinical Development Clinical Pharmacology Department, Pfizer, Cambridge, MA 02139, USA
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3
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Hann E, Malagu K, Stott A, Vater H. The importance of plasma protein and tissue binding in a drug discovery program to successfully deliver a preclinical candidate. PROGRESS IN MEDICINAL CHEMISTRY 2022; 61:163-214. [PMID: 35753715 DOI: 10.1016/bs.pmch.2022.04.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Plasma protein binding and tissue binding are arguably two of the most critical parameters that are measured as part of a drug discovery program since, according to the free drug hypothesis, it is the free drug that is responsible for both efficacy and toxicity. This chapter aims to deconstruct the role of plasma protein and tissue binding in drug discovery programs, and to consider the conclusion made by Pfizer and Genentech/Depomed a decade ago that optimising plasma protein binding as an independent parameter does not significantly influence efficacy. This chapter will also examine how binding metrics are applied in drug discovery programs and explore circumstances where optimising plasma protein or tissue binding can be an effective strategy to deliver a candidate molecule for preclinical development with an early indication of sufficient therapeutic index.
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Affiliation(s)
- Elizabeth Hann
- Charles River Laboratories, Robinson Building, Chesterford Research Park, Saffron Walden, United Kingdom.
| | - Karine Malagu
- Charles River Laboratories, Robinson Building, Chesterford Research Park, Saffron Walden, United Kingdom
| | - Andrew Stott
- Charles River Laboratories, Robinson Building, Chesterford Research Park, Saffron Walden, United Kingdom
| | - Huw Vater
- Charles River Laboratories, Robinson Building, Chesterford Research Park, Saffron Walden, United Kingdom
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Guimaraes G, Yuan L, Li P. Antisense Oligonucleotide In Vitro Protein Binding Determination in Plasma, Brain and Cerebral Spinal Fluid Using Hybridization LC-MS/MS. Drug Metab Dispos 2021; 50:268-276. [PMID: 34921096 DOI: 10.1124/dmd.121.000751] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 12/10/2021] [Indexed: 11/22/2022] Open
Abstract
The development of quantitative models for prediction of drug pharmacokinetics based on in vitro data has transformed early drug discovery. Drug unbound fraction (ƒu) characterization is a key consideration in pharmacokinetic (PK) and pharmacodynamic (PD) modeling, assuming only unbound drug can interact with the target, and therefore has direct implications in the efficacy and potential toxicity of the drug. The current study describes the implementation of a hybridization LC-MS/MS platform for the direct quantitation of antisense oligonucleotide (ASO) ƒu The method provides substantial improvements including minimal matrix effects and high specificity when compared to previously used oligonucleotide ƒu detection methods such as ligand binding assays or liquid scintillation. The hybridization LC-MS/MS platform was integrated with ultracentrifugation, ultrafiltration and equilibrium dialysis, and method performance for each technique was evaluated. While ASO protein binding has been previously characterized in plasma, there were no studies that quantitated ASO ƒu in brain or CSF. As ASOs continue to undergo clinical trials for neurological and neuromuscular indications, ƒu characterization in brain and CSF can provide invaluable information about ASO distribution and target engagement in the central nervous system, therefore providing support for in vivo PK-PD data characterization. Significance Statement A novel hybridization LC-MS/MS based approach was successfully developed for the determination of ASO in vitro protein binding in plasma, and for the first time brain and cerebral spinal fluid. Ultrafiltration, equilibrium dialysis, and ultracentrifugation were assessed for the separation of unbound ASO from biological matrices. The hybridization LC-MS/MS platform provided unique advantages, including minimal matrix effects and high specificity, comparing to traditional ligand binding assays or liquid scintillation approaches, which enabled efficient and reliable in vitro protein binding assay.
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Balhara A, Kumar A, Kumar S, Samiulla DS, Giri S, Singh S. Exploration of inhibition potential of isoniazid and its metabolites towards CYP2E1 in human liver microsomes through LC-MS/MS analysis. J Pharm Biomed Anal 2021; 203:114223. [PMID: 34214766 DOI: 10.1016/j.jpba.2021.114223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 06/20/2021] [Accepted: 06/21/2021] [Indexed: 02/06/2023]
Abstract
Isoniazid (INH) is the first-line anti-tubercular drug that is used both for the prophylaxis as well as the treatment of tuberculosis (TB). The patients with TB are more vulnerable to secondary infections and other health complications, hence, they are usually administered a cocktail of drugs. This increases the likelihood of drug-drug interactions (DDIs). INH is clinically proven to interact with drugs like phenytoin, carbamazepine, diazepam, triazolam, acetaminophen, etc. Most of such clinical observations have been supported by in vitro inhibition studies involving INH and cytochrome P450 (CYP) enzymes. A few published in vitro studies have explored the CYP2E1 inhibition potential of INH to explain its interactions with acetaminophen and other CY2E1 substrates, such as chlorzoxazone, but none of them were able to demonstrate any significant inhibition of the enzyme by the drug. It was reported that metabolites of INH, such as acetylhydrazine and hydrazine, were bioactivated by CYP2E1, highlighting that perhaps the drug metabolites were responsible for the mechanism based inhibition (MBI) of the enzyme. Therefore, the purpose of this investigation was to explore CYP2E1 enzyme inhibition potential of INH and its four major metabolites, viz., acetylisoniazid, isonicotinic acid, acetylhydrazine and hydrazine, using human liver microsomes (HLM). Additionally, we determined the fraction unbound in microsomal incubation (fumic) for all the five compounds using equilibrium dialysis assay. We observed that INH and its metabolites had lower propensity for microsomal binding, and the metabolites also lacked the potential to inhibit CYP2E1 enzyme, either by direct inhibition or through MBI. This suggests involvement of some other mechanism to explain interactions of INH with CY2E1 substrates, signifying need of further exploration.
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Affiliation(s)
- Ankit Balhara
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S Nagar, 160062, Punjab, India
| | - Avinash Kumar
- Aurigene Discovery Technologies Ltd., Electronics City Phase II, Bengaluru, 560100, Karnataka, India
| | - Suryakant Kumar
- Aurigene Discovery Technologies Ltd., Electronics City Phase II, Bengaluru, 560100, Karnataka, India
| | - Dodheri Syed Samiulla
- Aurigene Discovery Technologies Ltd., Electronics City Phase II, Bengaluru, 560100, Karnataka, India
| | - Sanjeev Giri
- Aurigene Discovery Technologies Ltd., Electronics City Phase II, Bengaluru, 560100, Karnataka, India
| | - Saranjit Singh
- Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S Nagar, 160062, Punjab, India.
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Evaluation of Quantitative Structure Property Relationship Algorithms for Predicting Plasma Protein Binding in Humans. ACTA ACUST UNITED AC 2021; 17:100142. [PMID: 34017929 DOI: 10.1016/j.comtox.2020.100142] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The extent of plasma protein binding is an important compound-specific property that influences a compound's pharmacokinetic behavior and is a critical input parameter for predicting exposure in physiologically based pharmacokinetic (PBPK) modeling. When experimentally determined fraction unbound in plasma (fup) data are not available, quantitative structure-property relationship (QSPR) models can be used for prediction. Because available QSPR models were developed based on training sets containing pharmaceutical-like compounds, we compared their prediction accuracy for environmentally relevant and pharmaceutical compounds. Fup values were calculated using Ingle et al., Watanabe et al. and ADMET Predictor (Simulation Plus). The test set included 818 pharmaceutical and environmentally relevant compounds with fup values ranging from 0.01 to 1. Overall, the three QSPR models resulted in over-prediction of fup for highly binding compounds and under-prediction for low or moderately binding compounds. For highly binding compounds (0.01≤ fup ≤ 0.25), Watanabe et al. performed better with a lower mean absolute error (MAE) of 6.7% and a lower mean absolute relative prediction error (RPE) of 171.7 % than other methods. For low to moderately binding compounds, both Ingle et al. and ADMET Predictor performed better than Watanabe et al. with superior MAE and RPE values. The positive polar surface area, the number of basic functional groups and lipophilicity were the most important chemical descriptors for predicting fup. This study demonstrated that the prediction of fup was the most uncertain for highly binding compounds. This suggested that QSPR-predicted fup values should be used with caution in PBPK modeling.
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Jones RS, Chang JH, Flores M, Brecht E. Evaluation of a Competitive Equilibrium Dialysis Approach for Assessing the Impact of Protein Binding on Clearance Predictions. J Pharm Sci 2021; 110:536-542. [PMID: 32941852 DOI: 10.1016/j.xphs.2020.09.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 09/04/2020] [Accepted: 09/09/2020] [Indexed: 12/17/2022]
Abstract
Fraction unbound (fu) is an important consideration when characterizing the ADME properties of drug candidates. For highly bound compounds, there can be low confidence in quantifying fu introducing uncertainty in certain parameter estimations. Specifically, predictions of clearance (CL) rely on accurate fu values measured in plasma (fu,p) and microsomes (fu,mic) to scale in vitro intrinsic CL to in vivo CL. However, determining the ratio of fu,p/fu,mic may circumvent the need to measure discrete binding values. The purpose of this study was to evaluate a plasma-to-microsome competitive equilibrium dialysis (cED) method to determine fu,p/fu,mic ratio (fuR) for nine physiochemically-distinct compounds, and to investigate the impact of altering microsomal concentrations on fuR. The values of fuR were comparable to ratios calculated from discretely measured fu,p and fu,mic values. Furthermore, increasing microsomal concentrations increased fuR for basic and neutral compounds. When using fuR values, there was a good in vitro-in vivo correlation (IVIVC) (≤3-fold observed in vivo CL). These results suggest that the cED method used to determine fuR may be an appropriate, alternative IVIVC approach. Application of cED may extend beyond IVIVC of CL to evaluate other parameters such as species differences in protein binding and free tissue to plasma ratios.
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Affiliation(s)
- Robert S Jones
- Drug Metabolism and Pharmacokinetics, Genentech Inc., South San Francisco, CA 94080.
| | - Jae H Chang
- Drug Metabolism and Pharmacokinetics, Genentech Inc., South San Francisco, CA 94080
| | - Mauricio Flores
- Drug Metabolism and Pharmacokinetics, Genentech Inc., South San Francisco, CA 94080
| | - Elliot Brecht
- Drug Metabolism and Pharmacokinetics, Genentech Inc., South San Francisco, CA 94080
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Blaauboer BJ, Bayliss MK, Castell JV, Evelo CT, Frazier JM, Groen K, Gülden M, Guillouzo A, Hissink AM, Houston JB, Johanson G, de Jongh J, Kedderis GL, Reinhardt CA, van de Sandt JJ, Semino G. The Use of Biokinetics and in Vitro Methods in Toxicological Risk Evaluation. Altern Lab Anim 2020. [DOI: 10.1177/026119299602400408] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
| | - Martin K. Bayliss
- Department of Bioanalysis and Drug Metabolism, Glaxo Wellcome, Park Road, Ware, Herts. SG12 ODP, UK
| | - Jose V. Castell
- Unidad de Hepatologia Experimental, Hospital Universitario La Fe, Avda de Campanar 21, 46009 Valencia, Spain
| | - Chris T.A. Evelo
- Department of Pharmacology, Section of Toxicology, University of Limburg, 6200 MD Maastricht, The Netherlands
| | - John M. Frazier
- US Air Force, Armstrong Laboratory, Wright Patterson Air Force Base, OH 45433, USA
| | - Kees Groen
- Department of Clinical Pharmacokinetics, Janssen Research Foundation, Turnhoutseweg 30, 2340 Beerse, Belgium
| | - Michael Gülden
- Cell Toxicology Section, Institute of Toxicology, University of Kiel, Weimarer Strasse 8, 24106 Kiel, Germany
| | - André Guillouzo
- INSERM U49, Unité de Recherches Hépatologiques, Hôpital de Pontchaillou, 35033 Rennes Cedex, France
| | - Arendina M. Hissink
- Toxicology Division, TNO Nutrition and Food Research Institute, 3700 AJ Zeist, The Netherlands
| | - J. Brian Houston
- Department of Pharmacy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Gunnar Johanson
- Department of Toxicology and Chemistry, National Institute for Working Life, 171 84 Solna, Sweden
| | - Joost de Jongh
- RITOX, Utrecht University, 3508 TD Utrecht, The Netherlands
| | - Gregory L. Kedderis
- Chemical Industry Institute of Toxicology CIIT, Research Triangle Park, NC 27709, USA
| | - Christoph A. Reinhardt
- Swiss Alternatives to Animal Testing (SAAT), P.O. Box 14, 8614 Bertschikon-Zurich, Switzerland
| | | | - Giovanna Semino
- Laboratory of Toxicology, Institute of Pharmacological Sciences, Via Balzaretti 9, 20133 Milan, Italy
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9
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Establishment of a simultaneous assay for lemborexant, a novel dual orexin receptor antagonist, and its three metabolites, and its application to a clinical protein binding study. J Pharm Biomed Anal 2020; 187:113359. [DOI: 10.1016/j.jpba.2020.113359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 05/05/2020] [Accepted: 05/06/2020] [Indexed: 11/24/2022]
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10
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Fu X, Qin Y, Xia B, Wang Y, Shi P, Zhou Y. High-sensitivity detection of therapeutic drugs in complex biofluids using a packed ballpoint-electrospray ionization technique. Anal Bioanal Chem 2020; 412:2711-2720. [PMID: 32140733 DOI: 10.1007/s00216-020-02512-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 01/16/2020] [Accepted: 02/12/2020] [Indexed: 02/05/2023]
Abstract
A simple and sensitive C18 packed ballpoint-electrospray ionization (PBP-ESI) technique was developed for biofluid analysis. In this technique, the configuration of a commercial ballpoint consisting of a hollow chamber, an intermediate socket, and a metal ball was fully exploited. The rear-end hollow chamber was used for loading C18 adsorbent and sample, and the front metal ball served as a spray emitter for online ionization. The good electrical conductivity of the metal body allowed high voltage to be conveniently applied to the ballpoint without inserting the electrode into the solution for electrical connection. Urine sample was directly analyzed with the C18 packed ballpoint; plasma and whole blood samples were premixed with C18 adsorbent before being packed into the ballpoint for detection. As a result of the sample cleanup by C18 adsorbent, the salt matrix in the urine sample as well as the phospholipid and protein matrices in plasma and whole blood samples was significantly reduced. The lower limits of quantitation (LLOQs) for urine, plasma, and whole blood samples reached the subnanogram-per-milliliter level. Graphical abstract.
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Affiliation(s)
- Xian Fu
- Chengdu Institute of Biology, Chinese Academy of Sciences, No. 93 South Keyuan Road, Gaoxin Distinct, Chengdu, 610041, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yongping Qin
- GCP Center, West China Hospital, Sichuan University, Chengdu, 610041, Sichuan, China.
| | - Bing Xia
- Chengdu Institute of Biology, Chinese Academy of Sciences, No. 93 South Keyuan Road, Gaoxin Distinct, Chengdu, 610041, Sichuan, China
| | - Yu Wang
- Chengdu Institute of Biology, Chinese Academy of Sciences, No. 93 South Keyuan Road, Gaoxin Distinct, Chengdu, 610041, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Peiyu Shi
- Chengdu Institute of Biology, Chinese Academy of Sciences, No. 93 South Keyuan Road, Gaoxin Distinct, Chengdu, 610041, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yan Zhou
- Chengdu Institute of Biology, Chinese Academy of Sciences, No. 93 South Keyuan Road, Gaoxin Distinct, Chengdu, 610041, Sichuan, China.
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11
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May M, Schindler C, Engeli S. Modern pharmacological treatment of obese patients. Ther Adv Endocrinol Metab 2020; 11:2042018819897527. [PMID: 32030121 PMCID: PMC6977225 DOI: 10.1177/2042018819897527] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 12/09/2019] [Indexed: 12/21/2022] Open
Abstract
There are many angles to consider in drug treatment of obese patients. On the one hand, some specific weight loss drugs are available, on the other, several drugs are associated with unintentional weight changes. When treating an obese patient for any given disease, several physiological changes may influence the pharmacokinetic properties of the drugs required. Thus, increased body weight may influence the efficacy and safety of some drug treatments. Even more complicated is the situation after weight reduction surgery. Due to the various changes to the gastrointestinal tract induced by the different surgical techniques used, and the dynamic changes in body composition thereafter, drug dosing has to be constantly reconsidered. Whereas all of these issues are of clinical importance, none of them have been investigated in the necessary depth and broadness to ensure safe and efficacious drug treatment of the massively obese patient. Individual considerations have to be based on comorbidities, concomitant medication, and on specific drug properties, for example, lipophilicity, volume of distribution, and metabolism. In this article we summarize the data available on different aspects of drug treatment in the obese patient with the hope of improving patient care.
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Affiliation(s)
| | - Christoph Schindler
- MHH Clinical Research Center Core Facility (OE 8660) and Center for Pharmacology and Toxicology, Hannover, Germany
| | - Stefan Engeli
- Hannover Medical School, Institute of Clinical Pharmacology, Hannover, Germany
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12
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Chow TW, Nguyen TA, Riggs KW, Rurak DW. An in vivo evaluation of the ontogeny of stereoselective fluoxetine metabolism and disposition in lambs from birth to one year of age. Xenobiotica 2019; 49:1360-1372. [PMID: 30587071 DOI: 10.1080/00498254.2018.1563922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
1. The objective was to determine the ontogeny of stereoselective fluoxetine (FX) disposition in postnatal sheep from newborn to adulthood. 2. Catheters were implanted in a carotid artery and jugular vein. FX was administered intravenously, followed by serial arterial blood and cumulative urine collection. The concentrations of R,S-FX and R,S-norfluoxetine (R,S-NFX) in samples were measured using a validated enantioselective LC/MS/MS analytical method. 3. The metabolism of FX at 4.2 ± 0.4 days was limited compared to adults, but had developed compared to the fetus. Total body clearance (ClTB) did not significantly increase up to 33.6 ± 0.9 days, but significantly increased at 98.5 ± 2.0 days, with no further changes up to 397.3 ± 8.5 days. Up to 13.4 ± 0.8 days, the disposition of FX included Phase I metabolism to NFX and trifluoromethylphenol (TFMP), and renal elimination. At 32.9 ± 0.9 days, metabolism included Phase II conjugates of FX and NFX. Renal elimination of these compounds was low. 4. The elimination of FX increased in a non-linear manner during the first year in sheep. The metabolism and disposition of FX and NFX in plasma and urine were stereoselective and this appeared due to both stereoselective protein binding and metabolism.
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Affiliation(s)
- Timothy W Chow
- a Faculty of Pharmaceutical Sciences, The University of British Columbia , Vancouver , British Columbia , Canada
| | - Tuan-Anh Nguyen
- b BC Children's Hospital Research Institute, The University of British Columbia , Vancouver , British Columbia , Canada
| | - K Wayne Riggs
- a Faculty of Pharmaceutical Sciences, The University of British Columbia , Vancouver , British Columbia , Canada
| | - Dan W Rurak
- b BC Children's Hospital Research Institute, The University of British Columbia , Vancouver , British Columbia , Canada
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13
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Ayyar VS, Song D, DuBois DC, Almon RR, Jusko WJ. Modeling Corticosteroid Pharmacokinetics and Pharmacodynamics, Part I: Determination and Prediction of Dexamethasone and Methylprednisolone Tissue Binding in the Rat. J Pharmacol Exp Ther 2019; 370:318-326. [PMID: 31197020 DOI: 10.1124/jpet.119.257519] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 06/10/2019] [Indexed: 01/18/2023] Open
Abstract
The plasma and tissue binding properties of two corticosteroids, dexamethasone (DEX) and methylprednisolone (MPL), were assessed in the rat in anticipation of developing physiologically based pharmacokinetic and pharmacokinetic/pharmacodynamic models. The tissue-to-plasma partition coefficients (K P) of DEX and MPL were measured in liver, muscle, and lung in vivo after steady-state infusion and bolus injection in rats. Since K P is often governed by reversible binding to macromolecules in blood and tissue, an attempt was made to assess K P values of DEX and MPL by in vitro binding studies using rat tissue homogenates and to compare these estimates to those obtained from in vivo kinetics after dosing. The K P values of both steroids were also calculated in rat tissues using mechanistic tissue composition-based equations. The plasma binding of DEX and MPL was linear with moderate binding (60.5% and 82.5%) in male and female rats. In vivo estimates of steroid uptake appeared linear across the tested concentrations and K P was highest in liver and lowest in muscle for both steroids. Assessment of hepatic binding of MPL in vitro was severely affected by drug loss at 37°C in male liver homogenates, whereas DEX was stable in both male and female liver homogenates. With the exception of MPL in liver, in vitro-derived K P estimates reasonably agreed with in vivo values. The mechanistic equations modestly underpredicted K P for both drugs. Tissue metabolism, saturable tissue binding, and active uptake are possible factors that can complicate assessments of in vivo tissue binding of steroids when using tissue homogenates. SIGNIFICANCE STATEMENT: Assuming the free hormone hypothesis, the ratio of the unbound drug fraction in plasma and in tissues defines the tissue-to-plasma partition coefficient (K P), an important parameter in physiologically based pharmacokinetic modeling that determines total drug concentrations within tissues and the steady-state volume of distribution. This study assessed the plasma and tissue binding properties of the synthetic corticosteroids, dexamethasone and methylprednisolone, in rats using ultrafiltration and tissue homogenate techniques. In vitro-in vivo and in silico-in vivo extrapolation of K P was assessed for both drugs in liver, muscle, and lung. Although the extrapolation was fairly successful across the tissues, in vitro homogenate studies severely underpredicted the K P of methylprednisolone in liver, partly attributable to the extensive hepatic metabolism.
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Affiliation(s)
- Vivaswath S Ayyar
- Departments of Pharmaceutical Sciences (V.S.A., D.S., D.C.D., R.R.A., W.J.J.) and Biological Sciences (D.C.D., R.R.A.), State University of New York at Buffalo, Buffalo, New York
| | - Dawei Song
- Departments of Pharmaceutical Sciences (V.S.A., D.S., D.C.D., R.R.A., W.J.J.) and Biological Sciences (D.C.D., R.R.A.), State University of New York at Buffalo, Buffalo, New York
| | - Debra C DuBois
- Departments of Pharmaceutical Sciences (V.S.A., D.S., D.C.D., R.R.A., W.J.J.) and Biological Sciences (D.C.D., R.R.A.), State University of New York at Buffalo, Buffalo, New York
| | - Richard R Almon
- Departments of Pharmaceutical Sciences (V.S.A., D.S., D.C.D., R.R.A., W.J.J.) and Biological Sciences (D.C.D., R.R.A.), State University of New York at Buffalo, Buffalo, New York
| | - William J Jusko
- Departments of Pharmaceutical Sciences (V.S.A., D.S., D.C.D., R.R.A., W.J.J.) and Biological Sciences (D.C.D., R.R.A.), State University of New York at Buffalo, Buffalo, New York
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14
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Uddin MJ, Wilson AJ, Crews BC, Malerba P, Uddin MI, Kingsley PJ, Ghebreselasie K, Daniel CK, Nickels ML, Tantawy MN, Jashim E, Manning HC, Khabele D, Marnett LJ. Discovery of Furanone-Based Radiopharmaceuticals for Diagnostic Targeting of COX-1 in Ovarian Cancer. ACS OMEGA 2019; 4:9251-9261. [PMID: 31172046 PMCID: PMC6545551 DOI: 10.1021/acsomega.9b01093] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 05/09/2019] [Indexed: 05/03/2023]
Abstract
In vivo targeting and visualization of cyclooxygenase-1 (COX-1) using multimodal positron emission tomography/computed tomography imaging represents a unique opportunity for early detection and/or therapeutic evaluation of ovarian cancer because overexpression of COX-1 has been characterized as a pathologic hallmark of the initiation and progression of this disease. The furanone core is a common building block of many synthetic and natural products that exhibit a wide range of biological activities. We hypothesize that furanone-based COX-1 inhibitors can be designed as imaging agents for the early detection, delineation of tumor margin, and evaluation of treatment response of ovarian cancer. We report the discovery of 3-(4-fluorophenyl)-5,5-dimethyl-4-(p-tolyl)furan-2(5H)-one (FDF), a furanone-based novel COX-1-selective inhibitor that exhibits adequate in vivo stability, plasma half-life, and pharmacokinetic properties for use as an imaging agent. We describe a novel synthetic scheme in which a Lewis acid-catalyzed nucleophilic aromatic deiodo[18F]fluorination reaction is utilized for the radiosynthesis of [18F]FDF. [18F]FDF binds efficiently to COX-1 in vivo and enables sensitive detection of ovarian cancer in subcutaneous and peritoneal xenograft models in mice. These results provide the proof of principle for COX-1-targeted imaging of ovarian cancer and identify [18F]FDF as a promising lead compound for further preclinical and clinical development.
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Affiliation(s)
- Md. Jashim Uddin
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- E-mail: . Phone: 615-484-8674. Fax: 615.343-0704 (M.J.U.)
| | - Andrew J. Wilson
- Department of Obstetrics & Gynecology, Women’s
Reproductive
Health Research Center, and Department of Ophthalmology and Visual Sciences,
Vanderbilt Eye Institute, Vanderbilt University
Medical Center, Nashville, Tennessee 37232, United States
| | - Brenda C. Crews
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
| | - Paola Malerba
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- Department
of Pharmacy & Pharmaceutical Sciences, University of Bari “A. Moro”, Via Orabona 4, 70125 Bari, Italy
| | - Md. Imam Uddin
- Department of Obstetrics & Gynecology, Women’s
Reproductive
Health Research Center, and Department of Ophthalmology and Visual Sciences,
Vanderbilt Eye Institute, Vanderbilt University
Medical Center, Nashville, Tennessee 37232, United States
| | - Philip J. Kingsley
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
| | - Kebreab Ghebreselasie
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
| | - Cristina K. Daniel
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
| | - Michael L. Nickels
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
| | - Mohammed N. Tantawy
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
| | - Elma Jashim
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- Martin Luther
King Jr. Academic Magnet School of Health Sciences and Engineering, 613 17th Avenue North, Nashville, Tennessee 37203, United States
| | - H. Charles Manning
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
| | - Dineo Khabele
- Department of Obstetrics & Gynecology, Women’s
Reproductive
Health Research Center, and Department of Ophthalmology and Visual Sciences,
Vanderbilt Eye Institute, Vanderbilt University
Medical Center, Nashville, Tennessee 37232, United States
- Department
of Obstetrics and Gynecology, University
of Kansas School of Medicine, Kansas
City, Kansas 66160, United States
| | - Lawrence J. Marnett
- A. B.
Hancock, Jr., Memorial Laboratory for Cancer Research, Department
of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute
of Chemical Biology, Vanderbilt-Ingram Cancer Center,
and Department of Radiology
and Radiological Sciences, Vanderbilt Institute of Imaging Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- E-mail: (L.J.M.)
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15
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Li J, Li W, Dai X, Zhong D, Ding Y, Chen X. Bioequivalence of paclitaxel protein-bound particles in patients with breast cancer: determining total and unbound paclitaxel in plasma by rapid equilibrium dialysis and liquid chromatography-tandem mass spectrometry. Drug Des Devel Ther 2019; 13:1739-1749. [PMID: 31190752 PMCID: PMC6535670 DOI: 10.2147/dddt.s200679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 03/23/2019] [Indexed: 12/16/2022] Open
Abstract
Background and objective: Paclitaxel protein-bound particles for injectable suspension (nab-paclitaxel) showed many advantages in safety, effectiveness, and convenience. Different from conventional formulations, the bioequivalence evaluation of nab-paclitaxel formulations requires to determine the total amount of paclitaxel in plasma and the unbound paclitaxel to reflect their in vivo disposition. This study aimed to develop an analytical method to quantify the total and unbound paclitaxel in plasma and evaluate the bioequivalence of two formulations of nab-paclitaxel in patients with breast cancer. Materials and methods: An open-label, randomized, two-period crossover study was completed among 24 Chinese patients with breast cancer. The patients were randomized to receive either the test formulation on cycle 1 day 1 and after 21 days in cycle 2 day 1 by the reference formulation (Abraxane®), or vice versa. Rapid equilibrium dialysis was adopted to separate the unbound paclitaxel in human plasma. Total and unbound paclitaxel concentrations were measured by the validated liquid chromatography-tandem mass spectrometry methods over the range of 5.00-15,000 and 0.200-200 ng/mL, respectively. The bioequivalence of the test formulation to the reference formulation was assessed using the Food and Drug Administration and European Medicines Agency guidelines. Results: All the 90% confidence intervals (CIs) of the geometric mean ratios fell within the predetermined acceptance range. The 90% CIs for the area under the concentration-time curve (AUC) from 0 h to 72 h (AUC0-t), AUC from time zero to infinity (AUC0-∞), and peak plasma concentrations (Cmax) for total paclitaxel were 92.03%-98.05%, 91.98%-99.37%, and 91.37%-99.36%, respectively. The 90% CIs of AUC0-t, AUC0-∞, and Cmax for unbound paclitaxel were 86.77%-97.88%, 86.81%-97.88%, and 87.70%-98.86%, respectively. Conclusion: Bioequivalence between the two nab-paclitaxel formulations was confirmed for total and unbound paclitaxel at the studied dose regimen.
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Affiliation(s)
- Junling Li
- College of Sciences, Shanghai University, Shanghai, People’s Republic of China
| | - Wei Li
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Xiaojian Dai
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Dafang Zhong
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, People’s Republic of China
| | - Yaping Ding
- College of Sciences, Shanghai University, Shanghai, People’s Republic of China
| | - Xiaoyan Chen
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, People’s Republic of China
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16
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Li M, Mainquist-Whigham C, Karriker LA, Wulf LW, Zeng D, Gehring R, Riviere JE, Coetzee JF, Lin Z. An integrated experimental and physiologically based pharmacokinetic modeling study of penicillin G in heavy sows. J Vet Pharmacol Ther 2019; 42:461-475. [PMID: 31012501 DOI: 10.1111/jvp.12766] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 01/12/2019] [Accepted: 03/14/2019] [Indexed: 01/09/2023]
Abstract
Penicillin G is widely used in food-producing animals at extralabel doses and is one of the most frequently identified violative drug residues in animal-derived food products. In this study, the plasma pharmacokinetics and tissue residue depletion of penicillin G in heavy sows after repeated intramuscular administrations at label (6.5 mg/kg) and 5 × label (32.5 mg/kg) doses were determined. Plasma, urine, and environmental samples were tested as potential antemortem markers for penicillin G residues. The collected new data and other available data from the literature were used to develop a population physiologically based pharmacokinetic (PBPK) model for penicillin G in heavy sows. The results showed that antemortem testing of urine provided potential correlation with tissue residue levels. Based on the United States Department of Agriculture Food Safety and Inspection Service action limit of 25 ng/g, the model estimated a withdrawal interval of 38 days for penicillin G in heavy sows after 3 repeated intramuscular injections at 5 × label dose. This study improves our understanding of penicillin G pharmacokinetics and tissue residue depletion in heavy sows and provides a tool to predict proper withdrawal intervals after extralabel use of penicillin G in heavy sows, thereby helping safety assessment of sow-derived meat products.
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Affiliation(s)
- Miao Li
- Institute of Computational Comparative Medicine (ICCM), Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Christine Mainquist-Whigham
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa
| | - Locke A Karriker
- Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa.,Swine Medicine Education Center, College of Veterinary Medicine, Iowa State University, Ames, Iowa
| | - Larry W Wulf
- Pharmacology Analytical Support Team (PhAST), Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Iowa State University, Ames, Iowa
| | - Dongping Zeng
- Institute of Computational Comparative Medicine (ICCM), Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas.,National Reference Laboratory of Veterinary Drug Residues (SCAU), Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Ronette Gehring
- Institute of Computational Comparative Medicine (ICCM), Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Jim E Riviere
- Institute of Computational Comparative Medicine (ICCM), Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Johann F Coetzee
- Institute of Computational Comparative Medicine (ICCM), Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas.,Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa.,Pharmacology Analytical Support Team (PhAST), Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Iowa State University, Ames, Iowa
| | - Zhoumeng Lin
- Institute of Computational Comparative Medicine (ICCM), Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
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17
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Prieto P, Baird AW, Blaauboer BJ, Castell Ripoll JV, Corvi R, Dekant W, Dietl P, Gennari A, Gribaldo L, Griffin JL, Hartung T, Heindel JJ, Hoet P, Jennings P, Marocchio L, Noraberg J, Pazos P, Westmoreland C, Wolf A, Wright J, Pfaller W. The Assessment of Repeated Dose ToxicityIn Vitro: A Proposed Approach. Altern Lab Anim 2019; 34:315-41. [PMID: 16831063 DOI: 10.1177/026119290603400307] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Pilar Prieto
- ECVAM, Institute for Health & Consumer Protection, European Joint Research Centre, 21020 Ispra (VA), Italy
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18
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Improving Confidence in the Determination of Free Fraction for Highly Bound Drugs Using Bidirectional Equilibrium Dialysis. J Pharm Sci 2019; 108:1296-1302. [DOI: 10.1016/j.xphs.2018.10.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 09/28/2018] [Accepted: 10/01/2018] [Indexed: 11/21/2022]
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19
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Continuous low-dose infusion of patupilone increases the therapeutic index in mouse and rat tumour models. Anticancer Drugs 2018; 29:691-701. [PMID: 29734209 DOI: 10.1097/cad.0000000000000639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Patupilone is a microtubule-targeted cytotoxic agent with clinical efficacy, but causes diarrhoea in more than 80% of patients. The efficacy and tolerability of patupilone delivered continuously by subcutaneous (s.c.) mini-pumps [(mini-pump dose (MPD)] or by intravenous bolus administration [intravenous bolus dose (IVBD)] were compared preclinically to determine whether the therapeutic index could be improved. The antiproliferative potency in vitro of patupilone was determined by measuring total cell protein. Tumours were grown s.c. in rats (A15) or nude mice (KB31, KB8511) or intracranially in nude mice (NCI-H460-Luc). Efficacy was monitored by measuring tumour volumes, bioluminescence or survival. Toxicity was monitored by body weight and/or diarrhoea. Total drug levels in blood, plasma, tissues or dialysates were quantified ex-vivo by liquid chromatography-mass spectroscopy/mass spectroscopy. Patupilone was potent in vitro with GI50s of 0.24-0.28 nmol/l and GI90s of 0.46-1.64 nmol/l. In rats, a single IVBD of patupilone dose dependently inhibited the growth of A15 tumours, but also caused dose-dependent body weight loss and diarrhoea, whereas MPD achieved similar efficacy, but no toxicity. In mice, MPD showed efficacy similar to that of IVBD against KB31 and KB8511 tumours, but with reduced toxicity. In a mouse intracranial tumour model, IVBD was more efficacious than MPD, consistent with patupilone concentrations in the brain. MPD provided constant plasma levels, whereas IVBD had very high C0/Cmin ratios of 70-280 (rat) or 8000 (mouse) over the dosing cycle. Overall, the correlation of plasma and tumour levels with response indicated that a Cave of at least GI90 led to tumour stasis. Continuous low concentrations of patupilone by MPD increased the therapeutic index in s.c. rodent tumour models compared with IVBD by maintaining efficacy, but reducing toxicity.
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20
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Laborde L, Oz F, Ristov M, Guthy D, Sterker D, McSheehy P. Continuous low plasma concentrations of everolimus provides equivalent efficacy to oral daily dosing in mouse xenograft models of human cancer. Cancer Chemother Pharmacol 2017; 80:869-878. [PMID: 28779265 DOI: 10.1007/s00280-017-3407-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 07/25/2017] [Indexed: 12/19/2022]
Abstract
PURPOSE Everolimus is a drug used successfully in a number of different oncology indications, but significant on-target toxicities exist. We explored the possibility of improving the therapeutic index (TI) by studying alternative means of administering the drug based upon low continuous dosing. METHODS All studies were performed using naïve nude mice or nude mice bearing s.c. human renal 786-O tumours or human breast MDA-MB-468 tumours. Everolimus was administered via a standard emulsion, either i.v., p.o., i.p., s.c., or via s.c. osmotic mini-pumps (MP) or via poly-lactic-co-glycolic (PLGA)-microparticles (PLGA-µP) prepared from everolimus powder injected s.c. Total-drug levels in blood, plasma or tissues were quantified ex vivo by LC-MS/MS. Efficacy studies were performed over 2-3 weeks and toxicity assessed by changes in body weight, glucose and white blood cell count. Effects on tumour activity biomarkers were quantified using reverse-phase protein array. RESULTS Everolimus administration s.c. in an emulsion decreased the absorption rate but increased the C max and bio-availability of everolimus compared to standard approaches of administration p.o. or i.p. Everolimus administration s.c. via MP or PLGA-µP reduced the C max and provided continuous low concentrations of everolimus in the plasma, which inhibited tumour pS6/S6 to a similar degree to oral administration. Toxicities such as changes in body weight or white blood cell count were unaffected. Provided the everolimus concentration was above the free unbound IC50 for proliferation of the tumour cell line, efficacy could be achieved equivalent to that provided by standard oral administration. However, an overall improvement in the TI could not be demonstrated. CONCLUSIONS Continuous low plasma concentrations of everolimus can provide strong efficacy in preclinical models, which if translatable to the clinic may reduce on-target toxicities and so increase the TI.
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Affiliation(s)
- Laurent Laborde
- Oncology Research, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Fatos Oz
- Oncology Research, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Mitko Ristov
- Oncology Research, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Daniel Guthy
- Oncology Research, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Dario Sterker
- Oncology Research, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Paul McSheehy
- Oncology Research, Novartis Institutes for BioMedical Research, Basel, Switzerland. .,Basilea Pharmaceutica International AG, Grenzacherstrasse 487, Postfach 4005, Basel, Switzerland.
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21
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Yang H, Huang Y, He J, Li S, Tang B, Li H. Interaction of lafutidine in binding to human serum albumin in gastric ulcer therapy: STD-NMR, WaterLOGSY-NMR, NMR relaxation times, Tr-NOESY, molecule docking, and spectroscopic studies. Arch Biochem Biophys 2016; 606:81-9. [PMID: 27457418 DOI: 10.1016/j.abb.2016.07.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 07/19/2016] [Accepted: 07/21/2016] [Indexed: 12/11/2022]
Abstract
In this study, lafutidine (LAF) was used as a model compound to investigate the binding mechanism between antiulcer drugs and human serum albumin (HSA) through various techniques, including STD-NMR, WaterLOGSY-NMR, (1)H NMR relaxation times, tr-NOESY, molecule docking calculation, FT-IR spectroscopy, and CD spectroscopy. The analyses of STD-NMR, which derived relative STD (%) intensities, and WaterLOGSY-NMR, determined that LAF bound to HSA. In particular, the pyridyl group of LAF was in close contact with HSA binding pocket, whereas furyl group had a secondary binding. Competitive STD-NMR and WaterLOGSY-NMR experiments, with warifarin and ibuprofen as site-selective probes, indicated that LAF preferentially bound to site II in the hydrophobic subdomains IIIA of HSA. The bound conformation of LAF at the HSA binding site was further elucidated by transferred NOE effect (tr-NOESY) experiment. Relaxation experiments provided quantitative information about the relationship between the affinity and structure of LAF. The molecule docking simulations conducted with AutoDock and the restraints derived from STD results led to three-dimensional models that were consistent with the NMR spectroscopic data. The presence of hydrophobic forces and hydrogen interactions was also determined. Additionally, FT-IR and CD spectroscopies showed that LAF induced secondary structure changes of HSA.
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Affiliation(s)
- Hongqin Yang
- College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China
| | - Yanmei Huang
- College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China
| | - Jiawei He
- College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China
| | - Shanshan Li
- College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China
| | - Bin Tang
- College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China
| | - Hui Li
- College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
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22
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Gunn ML, Marin JR, Mills AM, Chong ST, Froemming AT, Johnson JO, Kumaravel M, Sodickson AD. A report on the Academic Emergency Medicine 2015 consensus conference “Diagnostic imaging in the emergency department: a research agenda to optimize utilization”. Emerg Radiol 2016; 23:383-96. [DOI: 10.1007/s10140-016-1398-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 04/12/2016] [Indexed: 11/29/2022]
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23
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Shaik AN, Bohnert T, Williams DA, Gan LL, LeDuc BW. Mechanism of Drug-Drug Interactions Between Warfarin and Statins. J Pharm Sci 2016; 105:1976-1986. [PMID: 27103011 DOI: 10.1016/j.xphs.2016.03.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 03/09/2016] [Accepted: 03/10/2016] [Indexed: 11/25/2022]
Abstract
The anticoagulant drug warfarin and the lipid-lowering statin drugs are commonly co-administered to patients with cardiovascular diseases. Clinically significant drug-drug interactions (DDIs) between these drugs have been recognized through case studies for many years, but the biochemical mechanisms causing these interactions have not been explained fully. Previous theories include kinetic alterations in cytochrome P-450-mediated drug metabolism or disturbances of drug-protein binding, leading to anticoagulant activity of warfarin; however, neither the enantioselective effects on warfarin metabolism nor the potential disruption of drug transporter function have been well investigated. This study investigated the etiology of the DDIs between warfarin and statins. Liquid chromatography-mass spectrometry methods were developed and validated to quantify racemic warfarin, 6 of its hydroxylated metabolites, and pure enantiomers of warfarin; these methods were applied to study the role of different absorption, distribution, metabolism, and excretion properties, leading to DDIs. Plasma protein binding displacement of warfarin was performed in the presence of statins using equilibrium dialysis method. Substrate kinetics of warfarin and pure enantiomers were performed with human liver microsomes to determine the kinetic parameters (Km and Vmax) for the formation of all 6 hydroxywarfarin metabolites, inhibition of warfarin metabolism in the presence of statins, was determined. Uptake transport studies of warfarin were performed using overexpressing HEK cell lines and efflux transport using human adenocarcinoma colonic cell line cells. Fluvastatin significantly displaced plasma protein binding of warfarin and pure enantiomers; no other statin resulted in significant displacement of warfarin. All the statins that inhibited the formation of 10-hydroxywarfarin, atorvastatin, pitavastatin, and simvastatin were highly potent compared to other statins; in contrast, only fluvastatin was found to be a potent inhibitor of formation of 7-hydroxy warfarin. Uptake and efflux drug transporters do not play any role in these DDIs. The results showed that DDIs between warfarin and statins are primarily caused by cytochrome P-450 inhibition.
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Affiliation(s)
- Abdul Naveed Shaik
- Department of Pharmaceutical Sciences, MCPHS University, 179 Longwood Avenue, Boston, Massachusetts 02115; Department of Drug Metabolism and Pharmacokinetics, Biogen, 14 Cambridge Center, Cambridge, Massachusetts 02140.
| | - Tonika Bohnert
- Department of Drug Metabolism and Pharmacokinetics, Biogen, 14 Cambridge Center, Cambridge, Massachusetts 02140
| | - David A Williams
- Department of Pharmaceutical Sciences, MCPHS University, 179 Longwood Avenue, Boston, Massachusetts 02115
| | - Lawrence L Gan
- Development Center for Biotechnology, Taipei 221, Taiwan
| | - Barbara W LeDuc
- Department of Pharmaceutical Sciences, MCPHS University, 179 Longwood Avenue, Boston, Massachusetts 02115
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24
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Garner R, Gopalakrishnan S, McCauley JA, Bednar RA, Gaul SL, Mosser SD, Kiss L, Lynch JJ, Patel S, Fandozzi C, Lagrutta A, Briscoe R, Liverton NJ, Paterson BM, Vornov JJ, Mazhari R. Preclinical pharmacology and pharmacokinetics of CERC-301, a GluN2B-selective N-methyl-D-aspartate receptor antagonist. Pharmacol Res Perspect 2015; 3:e00198. [PMID: 27022470 PMCID: PMC4777252 DOI: 10.1002/prp2.198] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 10/19/2015] [Indexed: 12/28/2022] Open
Abstract
The preclinical pharmacodynamic and pharmacokinetic properties of 4‐methylbenzyl (3S, 4R)‐3‐fluoro‐4‐[(Pyrimidin‐2‐ylamino) methyl] piperidine‐1‐carboxylate (CERC‐301), an orally bioavailable selective N‐methyl‐D‐aspartate (NMDA) receptor subunit 2B (GluN2B) antagonist, were characterized to develop a translational approach based on receptor occupancy (RO) to guide CERC‐301 dose selection in clinical trials of major depressive disorder. CERC‐301 demonstrated high‐binding affinity (Ki, 8.1 nmol L−1) specific to GluN2B with an IC50 of 3.6 nmol L−1 and no off‐target activity. CERC‐301 efficacy was demonstrated in the forced swim test with an efficacy dose (ED50) of 0.3–0.7 mg kg−1 (RO, 30–50%); increase in locomotor activity was observed at ED50 of 2 mg kg−1, corresponding to an RO of 75%. The predicted 50% RO concentration (Occ50) in humans was 400 nmol L−1, similar to that predicted for rat, dog, and monkey (300, 200, and 400 nmol L−1, respectively). Safety pharmacology and neurotoxicity studies raised no specific safety concerns. A first‐in‐human study in healthy males demonstrated a dose‐proportional pharmacokinetic profile, with Tmax of ~1 h and t1/2 of 12–17 h. Based on the preclinical and pharmacodynamic data, doses of ≥8 mg in humans are hypothesized to have an acceptable safety profile and result in clinically relevant peak plasma exposure.
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Affiliation(s)
| | | | | | | | | | | | - Laszlo Kiss
- Merck Sharp & Dohme Corp. West Point Pennsylvania
| | | | - Shil Patel
- Merck Sharp & Dohme Corp. West Point Pennsylvania
| | | | | | | | | | - Blake M Paterson
- Cerecor Inc.Baltimore Maryland; Johns Hopkins University School of Medicine Baltimore Maryland
| | - James J Vornov
- Cerecor Inc.Baltimore Maryland; Johns Hopkins University School of Medicine Baltimore Maryland
| | - Reza Mazhari
- Cerecor Inc.Baltimore Maryland; Johns Hopkins University School of Medicine Baltimore Maryland
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Chhonker YS, Chandasana H, Mukkavilli R, Prasad YD, Laxman TS, Vangala S, Bhatta RS. Assessment ofin vitrometabolic stability, plasma protein binding, and pharmacokinetics ofE- andZ-guggulsterone in rat. Drug Test Anal 2015; 8:966-75. [DOI: 10.1002/dta.1885] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 08/24/2015] [Accepted: 08/24/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Yashpal S. Chhonker
- Pharmacokinetics & Metabolism Division; CSIR-Central Drug Research Institute; Lucknow India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi India
| | - Hardik Chandasana
- Pharmacokinetics & Metabolism Division; CSIR-Central Drug Research Institute; Lucknow India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi India
| | - Rao Mukkavilli
- Advinus Therapeutics Limited; Bengaluru Karnataka India
- Manipal University; Manipal Karnataka India
| | - Yarra Durga Prasad
- Pharmacokinetics & Metabolism Division; CSIR-Central Drug Research Institute; Lucknow India
| | - Tulsankar Sachin Laxman
- Pharmacokinetics & Metabolism Division; CSIR-Central Drug Research Institute; Lucknow India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi India
| | | | - Rabi S. Bhatta
- Pharmacokinetics & Metabolism Division; CSIR-Central Drug Research Institute; Lucknow India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi India
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26
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Loureiro AI, Bonifácio MJ, Fernandes-Lopes C, Pires N, Igreja B, Wright LC, Soares-da-Silva P. Role of P-glycoprotein and permeability upon the brain distribution and pharmacodynamics of etamicastat: a comparison with nepicastat. Xenobiotica 2015; 45:828-39. [DOI: 10.3109/00498254.2015.1018985] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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27
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Bista SR, Haywood A, Hardy J, Lobb M, Tapuni A, Norris R. Protein binding of fentanyl and its metabolite nor-fentanyl in human plasma, albumin and α-1 acid glycoprotein. Xenobiotica 2014; 45:207-12. [PMID: 25314012 DOI: 10.3109/00498254.2014.971093] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
1.Fentanyl is a highly lipophilic opioid commonly used to treat cancer pain. Plasma protein binding (PPB) of fentanyl in human plasma is reported as 80-85%, however it is unclear whether fentanyl binds primarily to albumin (ALB) or α-1 acid glycoprotein (AAG) and no studies have been conducted on the metabolite, nor-fentanyl. Fentanyl is also known to bind to plasticware and ultrafiltration (UF) devices which impacts adversely on binding experiments. 2.PPB of fentanyl and nor-fentanyl to ALB and AAG in isotonic phosphate buffer solution and seeded human plasma was quantified. PPB was also performed in plasma samples obtained from cancer patients receiving transdermal fentanyl. The adsorption of fentanyl and nor-fentanyl to UF devices and plasticware commonly used in PPB studies was also assessed. 3.Fentanyl was shown to bind primarily to ALB as opposed to AAG, with nor-fentanyl exhibiting negligible binding to plasma proteins. Total PPB of fentanyl was 86-89% in seeded human plasma. PPB in 56 cancer patient samples was 95.1 ± 3.52% for fentanyl and 32.4 ± 21.9% for nor-fentanyl. 4.UF was shown to be a reliable and convenient method for PPB studies, thereby removing the need for complex testing for adsorption of the drug to plasticware during UF.
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Affiliation(s)
- Sudeep Raj Bista
- School of Pharmacy, Griffith Health Institute, Griffith University , Gold Coast, QLD , Australia
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28
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Vanstraelen K, Wauters J, De Loor H, Vercammen I, Annaert P, Lagrou K, Spriet I. Protein-Binding Characteristics of Voriconazole Determined by High-Throughput Equilibrium Dialysis. J Pharm Sci 2014; 103:2565-70. [DOI: 10.1002/jps.24064] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 06/02/2014] [Accepted: 06/03/2014] [Indexed: 01/08/2023]
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29
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Alkharfy KM, Ahmad A, Khan RMA, Al-Shagha WM. Pharmacokinetic plasma behaviors of intravenous and oral bioavailability of thymoquinone in a rabbit model. Eur J Drug Metab Pharmacokinet 2014; 40:319-23. [PMID: 24924310 DOI: 10.1007/s13318-014-0207-8] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 05/22/2014] [Indexed: 10/25/2022]
Abstract
Thymoquinone (THQ), the active constituent of Nigella sativa seeds, has demonstrated some potential pharmacological activities. The present study was designed to investigate the pharmacokinetic behavior of THQ following intravenous (IV) and oral (PO) administration using an animal model. THQ was given vascularly (5 mg/kg IV) and extravascularly (20 mg/kg PO) to Vole rabbits, and blood samples were collected at predetermined time points. The concentrations of THQ in plasma were measured by a high-performance liquid chromatography, and the pharmacokinetic parameters were determined using both compartmental and non-compartmental analyses. The calculated clearance (CL) following IV administration was 7.19 ± 0.83 ml/kg/min, and the estimated volume of distribution at steady state (V ss) was 700.90 ± 55.01 ml/kg. Whereas with PO dosing, apparent CL/F value was 12.30 ± 0.30 ml/min/kg and V ss/F was 5,109.46 ± 196.08 ml/kg. These parameters were associated with an elimination half-life (T 1/2) of 63.43 ± 10.69 and 274.61 ± 8.48 min with IV and PO dosing, respectively. The calculated absorption T 1/2 was about 217 min. Compartmental analysis revealed T 1/2α of ~8.9 min and T 1/2β of ~86.6 min. The calculated absolute bioavailability of THQ was ~58 % with a lag time of ~23 min. The estimated THQ protein binding was >99 %. Therefore, THQ represents a compound with rapid elimination and relatively slower absorption following PO administration.
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Affiliation(s)
- Khalid M Alkharfy
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, PO Box 2457, Riyadh, 11451, Saudi Arabia,
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Goswami R, Mukherjee S, Ghadiyaram C, Wohlfahrt G, Sistla RK, Nagaraj J, Satyam LK, Subbarao K, Palakurthy RK, Gopinath S, Krishnamurthy NR, Ikonen T, Moilanen A, Subramanya HS, Kallio P, Ramachandra M. Structure-guided discovery of 1,3,5 tri-substituted benzenes as potent and selective matriptase inhibitors exhibiting in vivo antitumor efficacy. Bioorg Med Chem 2014; 22:3187-203. [PMID: 24794746 DOI: 10.1016/j.bmc.2014.04.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 04/04/2014] [Accepted: 04/04/2014] [Indexed: 11/25/2022]
Abstract
Matriptase is a serine protease implicated in cancer invasion and metastasis. Expression of matriptase is frequently dysregulated in human cancers and matriptase has been reported to activate latent growth factors such as hepatocyte growth factor/scatter factor, and proteases such as urokinase plasminogen activator suggesting that matriptase inhibitors could have therapeutic potential in treatment of cancer. Here we report a structure-based approach which led to the discovery of selective and potent matriptase inhibitors with benzene as central core having 1,3,5 tri-substitution pattern. X-ray crystallography of one of the potent analogs in complex with matriptase revealed strong hydrogen bonding and salt-bridge interactions in the S1 pocket, as well as strong CH-π contacts between the P2/P4 cyclohexyl and Trp215 side-chain. An additional interaction of the pendant amine at cyclohexyl with Gln175 side-chain results in substantial improvement in matriptase inhibition and selectivity against other related serine proteases. Compounds 15 and 26 showed tumor growth inhibition in a subcutaneous DU-145 prostate cancer mouse model. These compounds could be useful as tools to further explore the biology of matriptase as a drug target.
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Affiliation(s)
- Rajeev Goswami
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Subhendu Mukherjee
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Chakshusmathi Ghadiyaram
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Gerd Wohlfahrt
- Orion Corporation, Orionintie 1, FIN-02101 Espoo, Finland
| | - Ramesh K Sistla
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Jwala Nagaraj
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Leena K Satyam
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Krishnaprasad Subbarao
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Rajendra K Palakurthy
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Sreevalsam Gopinath
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Narasimha R Krishnamurthy
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Tarja Ikonen
- Orion Corporation, Orionintie 1, FIN-02101 Espoo, Finland
| | - Anu Moilanen
- Orion Corporation, Tengströminkatu 8, FIN-20101 Turku, Finland
| | - Hosahalli S Subramanya
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India
| | - Pekka Kallio
- Orion Corporation, Tengströminkatu 8, FIN-20101 Turku, Finland
| | - Murali Ramachandra
- Aurigene Discovery Technologies Limited, 39-40 KIADB Industrial Area, Electronic City Phase II, Bangalore 560 100, India.
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Rundfeldt C, Gasparic A, Wlaź P. Imepitoin as novel treatment option for canine idiopathic epilepsy: pharmacokinetics, distribution, and metabolism in dogs. J Vet Pharmacol Ther 2014; 37:421-34. [PMID: 24611573 PMCID: PMC4280904 DOI: 10.1111/jvp.12117] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Accepted: 01/21/2014] [Indexed: 11/26/2022]
Abstract
Imepitoin is a novel anti-epileptic licensed in the European Union for the treatment of canine idiopathic epilepsy. The aim of this study was to characterize the pharmacokinetics of imepitoin in dogs and to evaluate the interaction with drug metabolizing enzymes. Upon administration of imepitoin tablets at a dose of 30 mg/kg to beagle dogs, high plasma levels were observed within 30 min following oral dosing, with maximal plasma concentrations of 14.9–17.2 μg/mL reached after 2–3 h. In a crossover study, co-administration of imepitoin tablets with food reduced the total AUC by 30%, but it did not result in significant changes in Tmax and Cmax, indicating lack of clinical relevance. No clinically relevant effects of sex and no accumulation or metabolic tolerance were observed upon twice daily dosing. Following single dose administration of 10–100 mg/kg, dose linearity was found. Administering [14C] imepitoin, high enteral absorption of 92% and primary fecal excretion were identified. Plasma protein binding was only 55%. At therapeutic plasma concentrations, imepitoin did not inhibit microsomal cytochrome P450 family liver enzymes in vitro. In rats, no relevant induction of liver enzymes was found. Therefore, protein binding or metabolism-derived drug–drug interactions are unlikely. Based on these data, imepitoin can be dosed twice daily, but the timing of tablet administration in relation to feeding should be kept consistent.
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Liu H, Sun H, Lu D, Zhang Y, Zhang X, Ma Z, Wu B. Identification of glucuronidation and biliary excretion as the main mechanisms for gossypol clearance:in vivoandin vitroevidence. Xenobiotica 2014; 44:696-707. [DOI: 10.3109/00498254.2014.891780] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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33
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Weiss HM, Gatlik E. Equilibrium Gel Filtration to Measure Plasma Protein Binding of Very Highly Bound Drugs. J Pharm Sci 2014; 103:752-9. [DOI: 10.1002/jps.23818] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 11/22/2013] [Accepted: 11/22/2013] [Indexed: 12/25/2022]
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34
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Staniszewska E, Malek K, Baranska M. Rapid approach to analyze biochemical variation in rat organs by ATR FTIR spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 118:981-986. [PMID: 24161861 DOI: 10.1016/j.saa.2013.09.131] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 09/26/2013] [Accepted: 09/27/2013] [Indexed: 06/02/2023]
Abstract
ATR FTIR spectra were collected from rat tissue homogenates (myocardium, brain, liver, lung, intestine, and kidney) to analyze their biochemical content. Based on the second derivative of an average spectral profile it was possible to assign bands e.g. to triglycerides and cholesterol esters, proteins, phosphate macromolecules (DNA, RNA, phospholipids, phosphorylated proteins) and others (glycogen, lactate). Peaks in the region of 1600-1700 cm(-1) related to amide I mode revealed the secondary structure of proteins. The collected spectra do not characterize morphological structure of the investigated tissues but show their different composition. The comparison of spectral information gathered from FTIR spectra of the homogenates and those obtained previously from FTIR imaging of the tissue sections implicates that the presented here approach can be successfully employed in the investigations of biochemical variation in animal tissues. Moreover, it can be used in the pharmacological and pharmacokinetic studies to correlate the overall biochemical status of the tissue with the pathological changes it has undergone.
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Affiliation(s)
- Emilia Staniszewska
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland
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35
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Kalgutkar AS, Frederick KS, Hatch HL, Ambler CM, Perry DA, Garigipati RS, Chang GC, Lefker BA, Clark RW, Morehouse LA, Francone O, Hu X. Identification of a novel, non-tetrahydroquinoline variant of the cholesteryl ester transfer protein (CETP) inhibitor torcetrapib, with improved aqueous solubility. Xenobiotica 2013; 44:591-605. [DOI: 10.3109/00498254.2013.874611] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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36
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Sun JA, Kong DZ, Zhen YQ, Li Q, Zhang W, Zhang JH, Yin ZW, Ren LM. Stereoselective binding of doxazosin enantiomers to plasma proteins from rats, dogs and humans in vitro. Acta Pharmacol Sin 2013; 34:1568-74. [PMID: 24241343 DOI: 10.1038/aps.2013.120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Accepted: 08/01/2013] [Indexed: 11/09/2022] Open
Abstract
AIM (±)Doxazosin is a long-lasting inhibitor of α1-adrenoceptors that is widely used to treat benign prostatic hyperplasia and lower urinary tract symptoms. In this study we investigated the stereoselective binding of doxazosin enantiomers to the plasma proteins of rats, dogs and humans in vitro. METHODS Human, dog and rat plasma were prepared. Equilibrium dialysis was used to determine the plasma protein binding of each enantiomer in vitro. Chiral HPLC with fluorescence detection was used to measure the drug concentrations on each side of the dialysis membrane bag. RESULTS Both the enantiomers were highly bound to the plasma proteins of rats, dogs and humans [(-)doxazosin: 89.4%-94.3%; (+)doxazosin: 90.9%-95.4%]. (+)Doxazosin exhibited significantly higher protein binding capacities than (-)doxazosin in all the three species, and the difference in the bound concentration (Cb) between the two enantiomers was enhanced as their concentrations were increased. Although the percentage of the plasma protein binding in the dog plasma was significantly lower than that in the human plasma at 400 and 800 ng/mL, the corrected percentage of plasma protein binding was dog>human>rat. CONCLUSION (-)Doxazosin and (+)doxazosin show stereoselective plasma protein binding with a significant species difference among rats, dogs and humans.
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37
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Liu FK, Wei GT. Bovine Serum Albumin as the Additive of Chiral Mobile Phase for Enantiometric Separation of Dansyl-Amino Acids with Size-Exclusion Chromatography. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200200094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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38
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Perkins EJ, Ankley GT, Crofton KM, Garcia-Reyero N, LaLone CA, Johnson MS, Tietge JE, Villeneuve DL. Current perspectives on the use of alternative species in human health and ecological hazard assessments. ENVIRONMENTAL HEALTH PERSPECTIVES 2013; 121:1002-10. [PMID: 23771518 PMCID: PMC3764090 DOI: 10.1289/ehp.1306638] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Accepted: 06/12/2013] [Indexed: 05/17/2023]
Abstract
BACKGROUND Traditional animal toxicity tests can be time and resource intensive, thereby limiting the number of chemicals that can be comprehensively tested for potential hazards to humans and/or to the environment. OBJECTIVE We compared several types of data to demonstrate how alternative models can be used to inform both human and ecological risk assessment. METHODS We reviewed and compared data derived from high throughput in vitro assays to fish reproductive tests for seven chemicals. We investigated whether human-focused assays can be predictive of chemical hazards in the environment. We examined how conserved pathways enable the use of nonmammalian models, such as fathead minnow, zebrafish, and Xenopus laevis, to understand modes of action and to screen for chemical risks to humans. RESULTS We examined how dose-dependent responses of zebrafish embryos exposed to flusilazole can be extrapolated, using pathway point of departure data and reverse toxicokinetics, to obtain human oral dose hazard values that are similar to published mammalian chronic toxicity values for the chemical. We also examined how development/safety data for human health can be used to help assess potential risks of pharmaceuticals to nontarget species in the environment. DISCUSSION Using several examples, we demonstrate that pathway-based analysis of chemical effects provides new opportunities to use alternative models (nonmammalian species, in vitro tests) to support decision making while reducing animal use and associated costs. CONCLUSIONS These analyses and examples demonstrate how alternative models can be used to reduce cost and animal use while being protective of both human and ecological health.
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Affiliation(s)
- Edward J Perkins
- US Army Engineer Research and Development Center, Vicksburg, Mississippi, USA.
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39
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Taghavi F, Moosavi-Movahedi AA, Bohlooli M, Habibi-Rezaei M, Hadi Alijanvand H, Amanlou M, Sheibani N, Saboury AA, Ahmad F. Energetic domains and conformational analysis of human serum albumin upon co-incubation with sodium benzoate and glucose. J Biomol Struct Dyn 2013; 32:438-47. [PMID: 23581982 DOI: 10.1080/07391102.2013.775599] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Sodium benzoate (SB), a powerful inhibitor of microbial growth, is one of the most commonly used food preservative. Here, we determined the effects of SB on human serum albumin (HSA) structure in the presence or absence of glucose after 35 days of incubation under physiological conditions. The biochemical, biophysical, and molecular approaches including free amine content assay (TNBSA assay), fluorescence, and circular dichroism spectroscopy (CD), differential scanning calorimetry (DSC), and molecular docking and LIGPLOT studies were utilized for structural studies. The TNBSA results indicated that SB has the ability to bind Lys residues in HSA through covalent bonds. The docking and LIGPLOT studies also determined another specific site via hydrophobic interactions. The CD results showed more structural helicity for HSA incubated with SB, while HSA incubated with glucose had the least, and HSA incubated with glucose + SB had medium helicity. Fluorescence spectrophotometry results demonstrated partial unfolding of HSA incubated with SB in the presence or absence of glucose, while maximum partial unfolding was observed in HSA incubated with glucose. These results were confirmed by DSC and its deconvoluted thermograms. The DSC results also showed significant changes in HSA energetic structural domains due to HSA incubation with SB in the presence or absence of glucose. Together, our studies showed the formation of three different intermediates and indicate that biomolecular investigation are effective in providing new insight into safety determinations especially in health-related conditions including diabetes.
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Affiliation(s)
- F Taghavi
- a Institute of Biochemistry and Biophysics, University of Tehran , Tehran , Iran
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40
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Trainor GL. The importance of plasma protein binding in drug discovery. Expert Opin Drug Discov 2013; 2:51-64. [PMID: 23496037 DOI: 10.1517/17460441.2.1.51] [Citation(s) in RCA: 216] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Plasma protein binding of drugs is a well-recognised phenomena, but it is only recently that the implications for drug action in vivo have been fully appreciated. Plasma proteins, by virtue of their high concentration, control the free drug concentration in plasma and in compartments in equilibrium with plasma, thereby, effectively attenuating drug potency in vivo. The historical background and thermodynamic basis for the 'Free Drug Principle' is presented, along with special considerations for intracellular targets, deep compartments and α1-acid glycoprotein binding. Real and apparent exceptions to the principle are discussed along with a survey of citations from the recent medicinal chemistry literature.
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Affiliation(s)
- George L Trainor
- Bristol-Myers Squibb Co., Discovery Chemistry, Pharmaceutical Research Institute, PO Box 4000, Princeton, NJ 08543-4000, USA
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Tremblay RT, Kim D, Fisher JW. Determination of tissue to blood partition coefficients for nonvolatile herbicides, insecticides, and fungicides using negligible depletion solid-phase microextraction (nd-SPME) and ultrafiltration. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2012; 75:288-298. [PMID: 22409491 DOI: 10.1080/15287394.2012.652059] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Partition coefficients (PCs) are used in physiologically based pharmacokinetic (PBPK) models to estimate the free concentration of a chemical in specific blood or organs. Biological PC(tissue:blood) (tissue to blood) values were determined for a series of nonvolatile herbicides, insecticides, and fungicides in liver, brain, skin, fat, kidneys, and muscle of male Sprague-Dawley rats using two different analytical methods. The free phase concentration (in phosphate-buffered saline) of a given chemical was measured in the presence and absence of tissue (including blood) and used to calculate the PC, defined as the ratio of the concentration of the chemical in saline to the concentration in the tissue. PCs were determined for 13 compounds with aqueous solubility ranging from 20 to 4100 mg/L, molecular weights from 187.3 to 342.2 g/mol, and log K (ow) values from -0.18 to 3.9. An ultrafiltration high-performance liquid chromatography (HPLC) method was implemented for compounds with log K (ow) near 0.1 or less and a negligible depletion solid-phase microextraction (nd-SPME) method for compounds with higher log K (ow). PC(tissue:saline) coefficients of variation were 0.13 (n = 3 compounds) on average for the HPLC method and 0.29 (n = 10 compounds) for the nd-SPME method. Presented here is one of the most comprehensive data sets of biological partition coefficients for herbicides, insecticides, and fungicides.
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Affiliation(s)
- Raphaël T Tremblay
- Interdisciplinary Toxicology Program, University of Georgia, Athens, Georgia, USA.
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42
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Villarroel MC, Pratz KW, Xu L, Wright JJ, Smith BD, Rudek MA. Plasma protein binding of sorafenib, a multi kinase inhibitor: in vitro and in cancer patients. Invest New Drugs 2011; 30:2096-102. [PMID: 22089297 DOI: 10.1007/s10637-011-9767-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Accepted: 11/02/2011] [Indexed: 12/13/2022]
Abstract
Sorafenib is an orally administered multikinase inhibitor that exhibits antiangiogenic and antitumor activity. Few investigators have been able to correlate cumulative sorafenib dose or total exposure to pharmacodynamic effects. This discrepancy may be in part due to poorly understood protein binding characteristics. Since unbound drug concentrations are believed to be more relevant to pharmacological and toxicological responses than total drug, an equilibrium dialysis method using 96-well microdialysis plates was optimized and validated for determining the fraction unbound (F(u)) sorafenib in human plasma and in isolated protein solutions. Unbound sorafenib concentrations were determined in cancer patients receiving the drug orally at a dose of 400 mg and 600 mg twice daily. Sorafenib was extensively bound with mean F(u) value of 0.3% in both non-cancer and cancer patient's plasma. The binding in plasma was concentration independent, indicating a low-affinity, possibly nonspecific and nonsaturable process. In isolated protein solutions, 99.8% and 79.3% of sorafenib was bound to human serum albumin (HSA) (4 g/dL) and α(1)-acid glycoprotein (AAG) (0.1 g/dL) with binding constants of 1.24 × 10(6) M(-1) and 1.40 × 10(5) M(-1), respectively. In cancer patients receiving sorafenib, unbound sorafenib was not correlated with patient characteristics or laboratory values. In conclusion, sorafenib is highly protein bound in human plasma with a higher affinity towards albumin and limited free drug may be partly responsible for its borderline clinical activity.
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Affiliation(s)
- Maria Cristina Villarroel
- The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Bunting-Blaustein Cancer Research Bldg, Room 1M52, Baltimore, MD 21231-1000, USA
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Kalgutkar AS, Tugnait M, Zhu T, Kimoto E, Miao Z, Mascitti V, Yang X, Tan B, Walsky RL, Chupka J, Feng B, Robinson RP. Preclinical Species and Human Disposition of PF-04971729, a Selective Inhibitor of the Sodium-Dependent Glucose Cotransporter 2 and Clinical Candidate for the Treatment of Type 2 Diabetes Mellitus. Drug Metab Dispos 2011; 39:1609-19. [DOI: 10.1124/dmd.111.040675] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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Determination of unbound vismodegib (GDC-0449) concentration in human plasma using rapid equilibrium dialysis followed by solid phase extraction and high-performance liquid chromatography coupled to mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:2119-26. [PMID: 21704573 DOI: 10.1016/j.jchromb.2011.05.048] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 05/27/2011] [Accepted: 05/29/2011] [Indexed: 11/22/2022]
Abstract
A rapid equilibrium dialysis (RED) assay followed by a solid phase extraction (SPE) high-performance liquid chromatography tandem mass spectrometry (LC-MS/MS) assay for the quantitative determination of unbound vismodegib in human plasma was developed and validated. The equilibrium dialysis was carried out using 0.3 mL plasma samples in the single-use plate RED system at 37°C for 6h. The dialysis samples (0.1 mL) were extracted using a Strata-X-C 33u Polymeric Strong Cation SPE plate and the resulting extracts were analyzed using reverse-phase chromatography and positive electrospray ionization (ESI) mass spectrometry. The standard curve, which ranged from 0.100 to 100 ng/mL for vismodegib, was fitted to a 1/x(2) weighted linear regression model. The lower limit of quantitation (LLOQ, 0.100 ng/mL) was sufficient to quantify unbound concentrations of vismodegib after dialysis. The intra-assay precision of the LC-MS/MS assay, based on the four analytical QC levels (LLOQ, low, medium and high), was within 7.7% CV and inter-assay precision was within 5.5% CV. The assay accuracy, expressed as %Bias, was within ±4.0% of the nominal concentration values. Extraction recovery of vismodegib was between 77.9 and 84.0%. The assay provides a means for accurate assessment of unbound vismodegib plasma concentrations in clinical studies.
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Wang XH, Cai LL, Zhang XY, Deng LY, Zheng H, Deng CY, Wen JL, Zhao X, Wei YQ, Chen LJ. Improved solubility and pharmacokinetics of PEGylated liposomal honokiol and human plasma protein binding ability of honokiol. Int J Pharm 2011; 410:169-74. [PMID: 21397675 DOI: 10.1016/j.ijpharm.2011.03.003] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Revised: 02/10/2011] [Accepted: 03/07/2011] [Indexed: 02/05/2023]
Abstract
PEGylated liposomal honokiol had been developed with the purpose of improving the solubility and pharmacokinetics compared with free honokiol. Human plasma protein binding ability of honokiol was also investigated. PEGylated liposomal honokiol was prepared by thin film evaporation-sonication method. Its mean particle size was 98.68 nm, mean zeta potential was -20.6 mV and encapsulation efficiency were 87.68±1.56%. The pharmacokinetics of PEGylated liposomal honokiol was studied after intravenous administration in Balb/c mice. There were significant differences of parameters T(1/2β) and AUC(0→∞) between them and liposome lengthened T(1/2β) and AUC(0→∞) values. The mean T(1/2β) value of PEGylated liposomal honokiol and free honokiol were 26.09 min and 13.46 min, respectively. The AUC(0→∞) ratio of PEGylated liposomal honokiol to free honokiol was about 1.85-fold (219.24 μg/mL min/118.68 μg/mL min) (P=0.000). Examination of protein binding ability showed that honokiol with 0.5, 8.0 and 20 μg/mL concentrations in human plasma achieved the percent of bound between 60% and 65%. The results suggested that PEGylated liposomal honokiol improved the solubility, increased the drug concentration in plasma, and withstanded the clearance. Besides, the percent of protein bound of honokiol in human plasma was between 60% and 65%.
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Affiliation(s)
- Xian-Huo Wang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China
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Plasma protein binding of polyphenols from maritime pine bark extract (USP). J Pharm Biomed Anal 2011; 54:127-32. [DOI: 10.1016/j.jpba.2010.07.038] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2010] [Accepted: 07/23/2010] [Indexed: 01/06/2023]
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Buttar D, Colclough N, Gerhardt S, MacFaul PA, Phillips SD, Plowright A, Whittamore P, Tam K, Maskos K, Steinbacher S, Steuber H. A combined spectroscopic and crystallographic approach to probing drug–human serum albumin interactions. Bioorg Med Chem 2010; 18:7486-96. [DOI: 10.1016/j.bmc.2010.08.052] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2010] [Revised: 08/26/2010] [Accepted: 08/29/2010] [Indexed: 10/19/2022]
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Eng H, Niosi M, McDonald TS, Wolford A, Chen Y, Simila STM, Bauman JN, Warmus J, Kalgutkar AS. Utility of the carboxylesterase inhibitor bis-para-nitrophenylphosphate (BNPP) in the plasma unbound fraction determination for a hydrolytically unstable amide derivative and agonist of the TGR5 receptor. Xenobiotica 2010; 40:369-80. [PMID: 20297923 DOI: 10.3109/00498251003706598] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The potent, functional agonist of the bile acid Takeda G-protein-coupled receptor 5 (TGR5), (S)-1-(6-fluoro-2-methyl-3,4-dihydroquinolin-1(2H)-yl)-2-(isoquinolin-5-yloxy)ethanone (3), represents a useful tool to probe in vivo TGR5 pharmacology. Rapid degradation of 3 in both rat and mouse plasma, however, hindered the conduct of in vivo pharmacokinetic/pharmacodynamic investigations (including plasma-free fraction (f(u plasma)) determination) in rodent models of pharmacology. Studies were therefore initiated to understand the biochemical basis for plasma instability so that appropriate methodology could be implemented in in vivo pharmacology studies to prevent the breakdown of 3. Compound 3 underwent amide bond cleavage in both rat and mouse plasma with half-lives (T(1/2)) of 39 + or - 7 and 9.9 + or - 0.1 min. bis(p-nitrophenyl) phosphate (BNPP), a specific inhibitor of carboxylesterases, was found to inhibit hydrolytic cleavage in a time- and concentration-dependent manner, which suggested the involvement of carboxylesterases in the metabolism of 3. In contrast with the findings in rodents, 3 was resistant to hydrolytic cleavage in both dog and human plasma. The instability of 3 was also observed in rat and mouse liver microsomes. beta-Nicotinamide adenine dinucleotide phosphate, reduced form (NADPH)-dependent metabolism of 3 occurred more rapidly (T(1/2) approximately 2.22-6.4 min) compared with the metabolic component observed in the absence of the co-factor (T(1/2) approximately 89-130 min). Oxidative metabolism dominated the NADPH-dependent decline of 3, whereas NADPH-independent metabolism of 3 proceeded via simple amide bond hydrolysis. Compound 3 was highly bound (approximately 95%) to both dog and human plasmas. Rat and mouse plasma, pre-treated with BNPP to inhibit carboxylesterases activity, were used to determine the f(u plasma) of 3. A BNPP concentration of 500 microM was determined to be optimal for these studies. Higher BNPP concentrations (1000 microM) appeared to displace 3 from its plasma protein-binding sites in preclinical species and human. Under the conditions of carboxylesterases-inhibited rat and mouse plasma, the level of protein binding displayed by 3 was similar to those observed in dog and human. In conclusion, a novel system has been devised to measure f(u plasma) for a plasma-labile compound. The BNPP methodology can be potentially applied to stabilize hydrolytic cleavage of structurally diverse carboxylesterase substrates in the plasma (and other tissue), thereby allowing the characterization of pharmacology studies on plasma-labile compounds if and when they emerge as hits in exploratory drug-discovery programmes.
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Affiliation(s)
- H Eng
- Pharmacokinetics, Dynamics and Metabolism, Groton, CT, USA
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Shibayama T, Matsushita Y, Kurihara A, Hirota T, Ikeda T. Prediction of pharmacokinetics of CS-023 (RO4908463), a novel parenteral carbapenem antibiotic, in humans using animal data. Xenobiotica 2010. [DOI: 10.3109/00498250601047889] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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van Steeg TJ, Krekels EHJ, Freijer J, Danhof M, de Lange ECM. Effect of altered AGP plasma binding on heart rate changes by S(-)-propranolol in rats using mechanism-based estimations of in vivo receptor affinity (K(B,vivo)). J Pharm Sci 2010; 99:2511-20. [PMID: 20020526 DOI: 10.1002/jps.22014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In contrast to the impact of plasma protein binding on pharmacokinetics, no quantitative in vivo information is available on its impact on pharmacodynamics. The pharmacokinetic-pharmacodynamic relationship of the model drug S(-)-propranolol was evaluated using mechanism-based estimations of in vivo receptor affinity (K(B,vivo)), under conditions of altered plasma protein binding resulting from different levels of alpha-1-acid glycoprotein (AGP). Male Wistar Kyoto rats with isoprenaline-induced tachycardia received an intravenous infusion of S(-)-propranolol, on postsurgery day 2 (n = 7) and day 7 (n = 8) with elevated and normal plasma protein binding, respectively. Serial blood samples were taken in parallel to heart rate measurements. AGP concentrations at 2 and 7 days postsurgery were 708 +/- 274 and 176 +/- 111 microg/mL (mean +/- SE), respectively. Using nonlinear mixed effects modeling, AGP concentration was a covariate for intercompartmental clearance for the third compartment of the pharmacokinetic model of S(-)-propranolol. Individual values of AGP concentrations ranged between 110 and 1150 microg/mL, and were associated with K(B,vivo) values of S(-)-propranolol from 7.0 to 30 nM. Using the K(B,vivo) for S(-)-propranolol with correction for average values for normal and elevated plasma protein binding, nearly identical values were found. This confirms, strictly quantitative, earlier indications that plasma protein binding restricts the pharmacodynamics of S(-)-propranolol.
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Affiliation(s)
- T J van Steeg
- Division of Pharmacology, Leiden/Amsterdam Center for Drug Research, Leiden University, Leiden, PO Box 9502, 2300 RA Leiden, The Netherlands
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