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Kadar EP, Eng H, Kalgutkar AS, Holliman CL, Steeno GS. Development of a sensitive LC-MS/MS assay to support human microdose study for an oral agonist of the GLP-1 receptor. Bioanalysis 2024; 16:545-555. [PMID: 39088035 PMCID: PMC11299791 DOI: 10.1080/17576180.2024.2349421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 04/26/2024] [Indexed: 08/02/2024] Open
Abstract
Aim: The purpose of this work was to determine the feasibility of supporting a clinical microdose study for PF-06882961 (danuglipron), an oral small molecule agonist of the GLP-1 receptor, by LC-MS/MS. Methodology: Statistical instrument parameter optimization using response surface methodology was employed to develop a LC-MS/MS method for the analyte, PF-06882961. Results: An LC-MS/MS method was developed and validated to support a proof of concept microdose pharmacokinetics preclinical study in monkeys, administered PF-06882961 (0.005 mg total, average dose = 0.0007 mg/kg) via intravenous bolus injection. Conclusion: The present study demonstrated the feasibility of analyzing human microdose plasma samples for PF-06882961 by LC-MS/MS, instead of accelerator mass spectrometry, thereby reducing cost and eliminating synthesis and exposure to 14C labeled material.
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Affiliation(s)
- Eugene P Kadar
- Medicine Design, Pfizer Worldwide Research & Development, Pfizer Inc., Groton, CT06430, USA
| | - Heather Eng
- Medicine Design, Pfizer Worldwide Research & Development, Pfizer Inc., Groton, CT06430, USA
| | - Amit S Kalgutkar
- Medicine Design, Pfizer Worldwide Research & Development, Pfizer Inc., Cambridge, MA02139, USA
| | - Christopher L Holliman
- Medicine Design, Pfizer Worldwide Research & Development, Pfizer Inc., Groton, CT06430, USA
| | - Gregory S Steeno
- Global Biometrics and Data Management, Pfizer Worldwide Research & Development, Pfizer Inc., Groton, CT06430, USA
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Young GC, Spracklin DK, James AD, Hvenegaard MG, Pedersen ML, Wagner DS, Georgi K, Schieferstein H, Bjornsdottir I, Romeo AA, Cassidy KC, Da-Violante G, Blech S, Schulz SI, Cuyckens F, Nguyen MA, Scarfe G. Non-Labeled, Stable Labeled, or Radiolabelled Approaches for Provision of Intravenous Pharmacokinetics in Humans: A Discussion Piece. Clin Pharmacol Ther 2024; 115:931-938. [PMID: 38018358 DOI: 10.1002/cpt.3121] [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: 08/21/2023] [Accepted: 11/21/2023] [Indexed: 11/30/2023]
Abstract
A review of the use of microdoses and isotopic microtracers for clinical intravenous pharmacokinetic (i.v. PK) data provision is presented. The extent of application of the varied approaches available and the relative merits of each are highlighted with the aim of assisting practitioners in making informed decisions on the most scientifically appropriate design to adopt for any given new drug in development. It is envisaged that significant efficiencies will be realized as i.v. PK data in humans becomes more routinely available for suitable assets in early development, than has been the case prior to the last decade.
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Affiliation(s)
| | | | | | | | - Mette L Pedersen
- Drug Metabolism and Pharmacokinetics, Early Research and Development, Cardiovascular, Renal and Metabolism, Biopharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | | | - Katrin Georgi
- The Healthcare Business of Merck KGaA, Darmstadt, Germany
| | | | | | - Andrea A Romeo
- Roche Pharma Research and Early Development, Basel, Switzerland
| | | | | | - Stefan Blech
- Boehringer-Ingelheim Pharma GmbH & Co. KG, Biberach, Germany
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Maier MLV, Siddens LK, Pennington JM, Uesugi SL, Labut EM, Vertel EA, Anderson KA, Tidwell LG, Tilton SC, Ognibene TJ, Turteltaub KW, Smith JN, Williams DE. Impact of phenanthrene co-administration on the toxicokinetics of benzo[a]pyrene in humans. UPLC-accelerator mass spectrometry following oral microdosing. Chem Biol Interact 2023; 382:110608. [PMID: 37369263 PMCID: PMC10782561 DOI: 10.1016/j.cbi.2023.110608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023]
Abstract
Current risk assessments for environmental carcinogens rely on animal studies utilizing doses orders of magnitude higher than actual human exposures. Epidemiological studies of people with high exposures (e.g., occupational) are of value, but rely on uncertain exposure data. In addition, exposures are typically not to a single chemical but to mixtures, such as polycyclic aromatic hydrocarbons (PAHs). The extremely high sensitivity of accelerator mass spectrometry (AMS) allows for dosing humans with known carcinogens with de minimus risk. In this study UPLC-AMS was used to assess the toxicokinetics of [14C]-benzo[a]pyrene ([14C]-BaP) when dosed alone or in a binary mixture with phenanthrene (Phe). Plasma was collected for 48 h following a dose of [14C]-BaP (50 ng, 5.4 nCi) or the same dose of [14C]-BaP plus Phe (1250 ng). Following the binary mixture, Cmax of [14C]-BaP significantly decreased (4.4-fold) whereas the volume of distribution (Vd) increased (2-fold). Further, the toxicokinetics of twelve [14C]-BaP metabolites provided evidence of little change in the metabolite profile of [14C]-BaP and the pattern was overall reduction consistent with reduced absorption (decrease in Cmax). Although Phe was shown to be a competitive inhibitor of the major hepatic cytochrome P-450 (CYP) responsible for metabolism of [14C]-BaP, CYP1A2, the high inhibition constant (Ki) and lack of any increase in unmetabolized [14C]-BaP in plasma makes this mechanism unlikely to be responsible. Rather, co-administration of Phe reduces the absorption of [14C]-BaP through a mechanism yet to be determined. This is the first study to provide evidence that, at actual environmental levels of exposure, the toxicokinetics of [14C]-BaP in humans is markedly altered by the presence of a second PAH, Phe, a common component of environmental PAH mixtures.
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Affiliation(s)
- Monica L Vermillion Maier
- Linus Pauling Institute, Oregon State University, Corvallis, OR, 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA.
| | - Lisbeth K Siddens
- Linus Pauling Institute, Oregon State University, Corvallis, OR, 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA.
| | - Jamie M Pennington
- Linus Pauling Institute, Oregon State University, Corvallis, OR, 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA.
| | - Sandra L Uesugi
- Linus Pauling Institute, Oregon State University, Corvallis, OR, 97331, USA.
| | - Edwin M Labut
- Linus Pauling Institute, Oregon State University, Corvallis, OR, 97331, USA.
| | - Emily A Vertel
- Linus Pauling Institute, Oregon State University, Corvallis, OR, 97331, USA.
| | - Kim A Anderson
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, 97331, USA.
| | - Lane G Tidwell
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA.
| | - Susan C Tilton
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, 97331, USA.
| | - Ted J Ognibene
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA.
| | - Kenneth W Turteltaub
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA; Biology and Biotechnology Research Division, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA.
| | - Jordan N Smith
- NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, 97331, USA; Chemical Biology and Exposure Science, Pacific Northwest National Laboratory, Richland, WA, 99354, USA.
| | - David E Williams
- Linus Pauling Institute, Oregon State University, Corvallis, OR, 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, 97331, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, 97331, USA
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4
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Gumieniczek A, Berecka-Rycerz A. Metabolism and Chemical Degradation of New Antidiabetic Drugs (Part II): A Review of Analytical Approaches for Analysis of Gliptins. Biomedicines 2023; 11:1956. [PMID: 37509595 PMCID: PMC10377395 DOI: 10.3390/biomedicines11071956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 07/06/2023] [Accepted: 07/07/2023] [Indexed: 07/30/2023] Open
Abstract
This paper is part II of the review on metabolism and chemical degradation of new antidiabetic drugs from glutides, gliflozins and gliptins. It is well known that metabolism data can be helpful for deriving safe levels of degradation impurities and their qualifying as far as toxicological aspects are concerned. As a result, it could link the quality of respective pharmaceutical products to clinical practice and patients. Some overlapping pathways of transformations of these important drugs of different chemical structures and different mechanisms of action were discussed. At the same time, the paper summarized interesting analytical tools for conducting modern drug metabolism as well as drug degradation experiments. The methods described here include liquid chromatography (LC) and liquid chromatography coupled with mass spectrometry (LC-MS or LC-MS/MS), which are widely used for detection and quantitative measurements of the drugs, their metabolites and degradants, as well as radiometric methods that are suitable for pharmacokinetic experiments. Special attention was paid to dedicated types of packing in chromatographic columns, as well as to special solutions in the LC-MS procedures. The present part addresses the analytical approaches elaborated for examining the metabolism and degradation pathways of gliptins that are dipeptidyl peptidase 4 (DPP-4) inhibitors.
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Affiliation(s)
- Anna Gumieniczek
- Department of Medicinal Chemistry, Faculty of Pharmacy, Medical University of Lublin, Jaczewskiego 4, 20-090 Lublin, Poland
| | - Anna Berecka-Rycerz
- Department of Medicinal Chemistry, Faculty of Pharmacy, Medical University of Lublin, Jaczewskiego 4, 20-090 Lublin, Poland
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5
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Vermillion Maier ML, Siddens LK, Pennington JM, Uesugi SL, Tilton SC, Vertel EA, Anderson KA, Tidwell LG, Ognibene TJ, Turteltaub KW, Smith JN, Williams DE. Benzo[a]pyrene toxicokinetics in humans following dietary supplementation with 3,3'-diindolylmethane (DIM) or Brussels sprouts. Toxicol Appl Pharmacol 2023; 460:116377. [PMID: 36642108 PMCID: PMC9946811 DOI: 10.1016/j.taap.2023.116377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/05/2023] [Accepted: 01/09/2023] [Indexed: 01/15/2023]
Abstract
Utilizing the atto-zeptomole sensitivity of UPLC-accelerator mass spectrometry (UPLC-AMS), we previously demonstrated significant first-pass metabolism following escalating (25-250 ng) oral micro-dosing in humans of [14C]-benzo[a]pyrene ([14C]-BaP). The present study examines the potential for supplementation with Brussels sprouts (BS) or 3,3'-diindolylmethane (DIM) to alter plasma levels of [14C]-BaP and metabolites over a 48-h period following micro-dosing with 50 ng (5.4 nCi) [14C]-BaP. Volunteers were dosed with [14C]-BaP following fourteen days on a cruciferous vegetable restricted diet, or the same diet supplemented for seven days with 50 g of BS or 300 mg of BR-DIM® prior to dosing. BS or DIM reduced total [14C] recovered from plasma by 56-67% relative to non-intervention. Dietary supplementation with DIM markedly increased Tmax and reduced Cmax for [14C]-BaP indicative of slower absorption. Both dietary treatments significantly reduced Cmax values of four downstream BaP metabolites, consistent with delaying BaP absorption. Dietary treatments also appeared to reduce the T1/2 and the plasma AUC(0,∞) for Unknown Metabolite C, indicating some effect in accelerating clearance of this metabolite. Toxicokinetic constants for other metabolites followed the pattern for [14C]-BaP (metabolite profiles remained relatively consistent) and non-compartmental analysis did not indicate other significant alterations. Significant amounts of metabolites in plasma were at the bay region of [14C]-BaP irrespective of treatment. Although the number of subjects and large interindividual variation are limitations of this study, it represents the first human trial showing dietary intervention altering toxicokinetics of a defined dose of a known human carcinogen.
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Affiliation(s)
- Monica L Vermillion Maier
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, ALS 1007, Oregon State University, Corvallis, OR 97331, USA.
| | - Lisbeth K Siddens
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA.
| | - Jamie M Pennington
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA.
| | - Sandra L Uesugi
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA.
| | - Susan C Tilton
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR 97331, USA.
| | - Emily A Vertel
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA.
| | - Kim A Anderson
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR 97331, USA.
| | - Lane G Tidwell
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA.
| | - Ted J Ognibene
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
| | - Kenneth W Turteltaub
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA; Biology and Biotechnology Research Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
| | - Jordan N Smith
- NIEHS Superfund Research Program, Oregon State University, Corvallis, OR 97331, USA; Chemical Biology and Exposure Science, Pacific Northwest National Laboratory, Richland, WA 99354, USA.
| | - David E Williams
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR 97331, USA.
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6
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Accelerator mass spectrometry for quantification of micro- and therapeutic dose diclofenac in microdialysis samples. Bioanalysis 2022; 14:1111-1122. [PMID: 36165918 DOI: 10.4155/bio-2022-0064] [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: 11/17/2022] Open
Abstract
Background: Microdialysis sampling after drug microdosing may provide tissue pharmacokinetic data early in clinical drug development. However, low administered doses and small sample volumes pose an analytical challenge, particularly for highly protein-bound drugs. Materials & methods: Carbon-14 [14C]diclofenac was used as a model drug to assess the technical and analytical feasibility of in vivo microdialysis after microdose administration in an in vitro setup. Results: [14C]diclofenac dialysate concentrations were accurately quantified with accelerator MS. [14C]diclofenac dialysate recoveries were similar in the presence and absence of therapeutic diclofenac concentrations but were considerably decreased when albumin was added to the immersion solution, suggesting high protein binding. Conclusion: These results demonstrate the feasibility of combining microdosing and microdialysis to assess tissue pharmacokinetics.
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Bolleddula J, Chen H, Cohen L, Zhou X, Pusalkar S, Berger A, Sedarati F, Venkatakrishnan K, Chowdhury SK. Metabolism and Disposition of [14C]Pevonedistat, a First-In-Class NEDD8 ‑Activating Enzyme Inhibitor, After Intravenous Infusion to Patients With Advanced Solid Tumors. Drug Metab Dispos 2022; 50:989-997. [PMID: 35504658 DOI: 10.1124/dmd.122.000842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 03/29/2022] [Indexed: 11/22/2022] Open
Abstract
Metabolism and disposition of pevonedistat, an investigational, first-in-class inhibitor of the NEDD8-activating enzyme (NAE), were characterized in patients with advanced solid tumors after intravenous infusion of [14C]pevonedistat at 25 mg/m2 (~60-85mCi radioactive dose). More than 94% of the administered dose was recovered, with ~41% and ~53% of drug-related material eliminated in urine and feces, respectively. The metabolite profiles of [14C]pevonedistat were established in plasma using an accelerator mass spectrometer (AMS) and excreta with traditional radiometric analysis. In plasma, unchanged parent drug accounted for approximately 49% of the total drug-related material. Metabolites M1 and M2 were major (>10% of the total drug-related material) circulating metabolites and accounted for approximately 15% and 22% of the drug related material, respectively. Unchanged [14C]pevonedistat accounted for approximately 4% and 17% of the dose in urine and feces, respectively. Oxidative metabolites M1, M2, and M3 appeared as the most abundant drug-related components in the excreta and represented approximately 27%, 26%, and 15% of the administered dose, respectively. Based on the unbound plasma exposure in cancer patients and in vitro NAE inhibition, the contribution of metabolites M1 and M2 to overall in vivo pharmacological activity is anticipated to be minimal. The exposure to these metabolites was higher at safe and well tolerated doses in rat and dog (the two preclinical species used in toxicology evaluation) plasma than that observed in human plasma. Reaction phenotyping studies revealed that CYP3A4/5 are primary enzymes responsible for the metabolic clearance of pevonedistat. Significance Statement This study details the metabolism and clearance mechanisms of pevonedistat, a first-in-class NEDD8‑activating enzyme inhibitor, after intravenous administration to patients with cancer. Pevonedistat is biotransformed to 2 major circulating metabolites with higher exposure in non-clinical toxicological species than in humans. The pharmacological activity contribution of these metabolites is minimal compared to the overall target pharmacological effect of pevonedistat. Renal clearance was not an important route of excretion of unchanged pevonedistat (~4% of the dose).
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Affiliation(s)
| | - Hao Chen
- Takeda Development Center Americas Inc., United States
| | | | - Xiaofei Zhou
- Clinical Pharmacology, Millennium Pharmaceuticals, Inc., a wholly owned subsidiary of Takeda Pharmaceutical Company Limited, United States
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8
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Vermillion Maier ML, Siddens LK, Pennington JM, Uesugi SL, Anderson KA, Tidwell LG, Tilton SC, Ognibene TJ, Turteltaub KW, Smith JN, Williams DE. Benzo[a]pyrene (BaP) metabolites predominant in human plasma following escalating oral micro-dosing with [ 14C]-BaP. ENVIRONMENT INTERNATIONAL 2022; 159:107045. [PMID: 34920278 PMCID: PMC8791557 DOI: 10.1016/j.envint.2021.107045] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 11/12/2021] [Accepted: 12/09/2021] [Indexed: 06/14/2023]
Abstract
Benzo[a]pyrene (BaP) is formed by incomplete combustion of organic materials (petroleum, coal, tobacco, etc.). BaP is designated by the International Agency for Research on Cancer as a group 1 known human carcinogen; a classification supported by numerous studies in preclinical models and epidemiology studies of exposed populations. Risk assessment relies on toxicokinetic and cancer studies in rodents at doses 5-6 orders of magnitude greater than average human uptake. Using a dose-response design at environmentally relevant concentrations, this study follows uptake, metabolism, and elimination of [14C]-BaP in human plasma by employing UPLC - accelerator mass spectrometry (UPLC-AMS). Volunteers were administered 25, 50, 100, and 250 ng (2.7-27 nCi) of [14C]-BaP (with interceding minimum 3-week washout periods) with quantification of parent [14C]-BaP and metabolites in plasma measured over 48 h. [14C]-BaP median Tmax was 30 min with Cmax and area under the curve (AUC) approximating dose-dependency. Marked inter-individual variability in plasma pharmacokinetics following a 250 ng dose was seen with 7 volunteers as measured by the Cmax (8.99 ± 7.08 ng × mL-1) and AUC0-48hr (68.6 ± 64.0 fg × hr-1 × mL-1). Approximately 3-6% of the [14C] recovered (AUC0-48 hr) was parent compound, demonstrating extensive metabolism following oral dosing. Metabolite profiles showed that, even at the earliest time-point (30 min), a substantial percentage of [14C] in plasma was polar BaP metabolites. The best fit modeling approach identified non-compartmental apparent volume of distribution of BaP as significantly increasing as a function of dose (p = 0.004). Bay region tetrols and dihydrodiols predominated, suggesting not only was there extensive first pass metabolism but also potentially bioactivation. AMS enables the study of environmental carcinogens in humans with de minimus risk, allowing for important testing and validation of physiologically based pharmacokinetic models derived from animal data, risk assessment, and the interpretation of data from high-risk occupationally exposed populations.
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Affiliation(s)
- Monica L Vermillion Maier
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA.
| | - Lisbeth K Siddens
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA.
| | - Jamie M Pennington
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA.
| | - Sandra L Uesugi
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA.
| | - Kim A Anderson
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR 97331, USA.
| | - Lane G Tidwell
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA.
| | - Susan C Tilton
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR 97331, USA.
| | - Ted J Ognibene
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
| | - Kenneth W Turteltaub
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA; Biology and Biotechnology Research Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
| | - Jordan N Smith
- NIEHS Superfund Research Program, Oregon State University, Corvallis, OR 97331, USA; Chemical Biology and Exposure Science, Pacific Northwest National Laboratory, Richland, WA 99354, USA.
| | - David E Williams
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331, USA; Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR 97331, USA.
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9
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Harrell AW, Wilson R, Man YL, Riddell K, Jarvis E, Young G, Chambers R, Crossman L, Georgiou A, Pereira A, Kenworthy D, Beaumont C, Marotti M, Wilkes D, Hessel EM, Fahy WA. An Innovative Approach to Characterize Clinical ADME and Pharmacokinetics of the Inhaled Drug Nemiralisib Using an Intravenous Microtracer Combined with an Inhaled Dose and an Oral Radiolabel Dose in Healthy Male Subjects. Drug Metab Dispos 2019; 47:1457-1468. [PMID: 31649125 DOI: 10.1124/dmd.119.088344] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 10/12/2019] [Indexed: 12/22/2022] Open
Abstract
An innovative open-label, crossover clinical study was used to investigate the excretion balance, pharmacokinetics, and metabolism of nemiralisib-an inhaled phosphoinositide 3-kinase delta inhibitor being developed for respiratory diseases. Six healthy men received a single intravenous microtracer of 10 µg [14C]nemiralisib with a concomitant inhaled nonradiolabeled 1000 µg dose followed by an oral 800 µg dose of [14C]nemiralisib 14 days later. Complementary methods including accelerator mass spectrometry allowed characterization of a range of parameters including oral absorption (Fabs), proportion of nemiralisib escaping gut wall metabolism (Fg), hepatic extraction (Eh), fraction of dose absorbed from inhaled dose (Flung), and renal clearance. Intravenous pharmacokinetics of nemiralisib were characterized by low blood clearance (10.0 l/h), long terminal half-life (55 hours), and high volume of distribution at steady state (728 l). Nemiralisib exhibited moderate inhaled and oral bioavailability (38% and 35%) while Flung was 29%. Absorption and first-pass parameters were corrected for blood renal clearance and compared with values without correction. Any swallowed nemiralisib was relatively well absorbed (Fabs, 0.48) with a high fraction escaping gut wall metabolism and low extraction by the liver (Fg and Eh being 0.83 and 0.10, respectively). There were no major human plasma metabolites requiring further qualification in animal studies. Both unchanged nemiralisib and its oxidative/conjugative metabolites were secreted in bile, with nemiralisib likely subject to further metabolism through enterohepatic recirculation. Direct renal clearance and metabolism followed by renal clearance were lesser routes of elimination. SIGNIFICANCE STATEMENT: A number of innovative features have been combined into one small clinical study enabling a comprehensive description of the human pharmacokinetics and metabolism of an inhaled molecule. Design elements included an intravenous 14C tracer administration concomitant with an inhalation dose that enabled derivation of parameters such as fraction absorbed (Fabs), the proportion of drug escaping first-pass extraction through the gut wall and liver (Fg and Fh) and hepatic extraction (Eh). Entero-test bile sampling enabled characterization of biliary elimination pathways.
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Affiliation(s)
- Andrew W Harrell
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Robert Wilson
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Yau Lun Man
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Kylie Riddell
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Emily Jarvis
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Graeme Young
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Robert Chambers
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Lee Crossman
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Alex Georgiou
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Adrian Pereira
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - David Kenworthy
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Claire Beaumont
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Miriam Marotti
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Denisa Wilkes
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - Edith M Hessel
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
| | - William A Fahy
- Drug Metabolism and Pharmacokinetics (A.W.H., G.Y., R.C., D.K.) and Bioanalysis, Immunogenicity and Biomarkers (A.G., A.P.), GlaxoSmithKline R&D, Ware, United Kingdom; RD Projects Clinical Platforms & Sciences (R.W.), Drug Metabolism and Pharmacokinetics (C.B.), Discovery Medicine (Y.L.M.), Biostatistics (E.J.), GlaxoSmithKline R&D and Refractory Respiratory Inflammation Discovery Performance Unit, GlaxoSmithKline, Stevenage, United Kingdom (E.M.H.); Safety and Medical Governance (M.M.) and Discovery Medicine (W.A.F.), GlaxoSmithKline R&D, Stockley Park, Uxbridge, United Kingdom; Global Clinical and Data Operations, GlaxoSmithKline R&D, Ermington, Australia (K.R.); Covance Laboratories, Harrogate, United Kingdom (L.C.); and Hammersmith Medicines Research, London, United Kingdom (D.W.)
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10
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Madeen E, Siddens LK, Uesugi S, McQuistan T, Corley RA, Smith J, Waters KM, Tilton SC, Anderson KA, Ognibene T, Turteltaub K, Williams DE. Toxicokinetics of benzo[a]pyrene in humans: Extensive metabolism as determined by UPLC-accelerator mass spectrometry following oral micro-dosing. Toxicol Appl Pharmacol 2018; 364:97-105. [PMID: 30582946 DOI: 10.1016/j.taap.2018.12.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 12/13/2018] [Accepted: 12/17/2018] [Indexed: 10/27/2022]
Abstract
Benzo[a]pyrene (BaP), is a known human carcinogen (International Agency for Research on Cancer (IARC) class 1). The remarkable sensitivity (zepto-attomole 14C in biological samples) of accelerator mass spectrometry (AMS) makes possible, with de minimus risk, pharmacokinetic (PK) analysis following [14C]-BaP micro-dosing of humans. A 46 ng (5 nCi) dose was given thrice to 5 volunteers with minimum 2 weeks between dosing and plasma collected over 72 h. [14C]-BaPeq PK analysis gave plasma Tmax and Cmax values of 1.25 h and 29-82 fg/mL, respectively. PK parameters were assessed by non- compartment and compartment models. Intervals between dosing ranged from 20 to 420 days and had little impact on intra-individual variation. DNA, extracted from peripheral blood mononuclear cells (PBMCs) of 4 volunteers, showed measurable levels (LOD ~ 0.5 adducts/1011 nucleotides) in two individuals 2-3 h post-dose, approximately three orders of magnitude lower than smokers or occupationally-exposed individuals. Little or no DNA binding was detectable at 48-72 h. In volunteers the allelic variants CYP1B1*1/*⁎1, *1/*3 or *3/*3 and GSTM1*0/0 or *1 had no impact on [14C]-BaPeq PK or DNA adduction with this very limited sample. Plasma metabolites over 72 h from two individuals (one CYP1B1*1/*1 and one CYP1B1*3/*3) were analyzed by UPLC-AMS. In both individuals, parent [14C]-BaP was a minor constituent even at the earliest time points and metabolite profiles markedly distinct. AMS, coupled with UPLC, could be used in humans to enhance the accuracy of pharmacokinetics, toxicokinetics and risk assessment of environmental carcinogens.
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Affiliation(s)
- Erin Madeen
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, USA
| | - Lisbeth K Siddens
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, USA; Linus Pauling Institute, Oregon State University, Corvallis, OR, USA
| | - Sandra Uesugi
- Linus Pauling Institute, Oregon State University, Corvallis, OR, USA
| | | | - Richard A Corley
- NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, USA; Chemical Biology and Exposure Science, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Jordan Smith
- NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, USA; Chemical Biology and Exposure Science, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Katrina M Waters
- NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, USA; Chemical Biology and Exposure Science, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Susan C Tilton
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, USA
| | - Kim A Anderson
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, USA
| | - Ted Ognibene
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - Kenneth Turteltaub
- Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, USA; Biology and Biotechnology Research Division, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - David E Williams
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR, USA; NIEHS Superfund Research Program, Oregon State University, Corvallis, OR, USA; Linus Pauling Institute, Oregon State University, Corvallis, OR, USA.
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11
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Nanotracing and cavity-ring down spectroscopy: A new ultrasensitive approach in large molecule drug disposition studies. PLoS One 2018; 13:e0205435. [PMID: 30332475 PMCID: PMC6192596 DOI: 10.1371/journal.pone.0205435] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 09/25/2018] [Indexed: 12/13/2022] Open
Abstract
New therapeutic biological entities such as bispecific antibodies targeting tissue or specific cell populations form an increasingly important part of the drug development portfolio. However, these biopharmaceutical agents bear the risk of extensive target-mediated drug disposition or atypical pharmacokinetic properties as compared to canonical antibodies. Pharmacokinetics and bio-distribution studies become therefore more and more important during lead optimization. Biologics present, however, greater analytical challenges than small molecule drugs due to the mass and selectivity limitation of mass spectrometry and ligand-binding assay, respectively. Radiocarbon (14C) and its detection methods, such as the emerging 14C cavity ring down spectroscopy (CRDS), thus can play an important role in the large molecule quantitation where a 14C-tag is covalently bound through a stable linker. CRDS has the advantage of a simplified sample preparation and introduction system as compared to accelerator mass spectrometry (AMS) and can be accommodated within an ordinary research laboratory. In this study, we report on the labeling of an anti-IL17 IgG1 model antibody with 14C propionate tag and its detection by CRDS using it as nanotracer (2.1 nCi or 77.7 Bq blended with the therapeutic dose) in a pharmacokinetics study in a preclinical species. We compare these data to data generated by AMS in parallel processed samples. The derived concentration time profiles for anti-IL17 by CRDS were in concordance with the ones derived by AMS and γ-counting of an 125I-labeled anti-IL17 radiotracer and were well described by a 2-compartment population pharmacokinetic model. In addition, antibody tissue distribution coefficients for anti-IL17 were determined by CRDS, which proved to be a direct and sensitive measurement of the extravascular tissue concentration of the antibody when tissue perfusion was applied. Thus, this proof-of-concept study demonstrates that trace 14C-radiolabels and CRDS are an ultrasensitive approach in (pre)clinical pharmacokinetics and bio-distribution studies of new therapeutic entities.
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12
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Kim A, Yu BY, Dueker SR, Shin KH, Kim HS, Ahn H, Cho JY, Yu KS, Jang IJ, Lee H. An Accelerator Mass Spectrometry-Enabled Microtracer Study to Evaluate the First-Pass Effect on the Absorption of YH4808. Clin Pharmacol Ther 2017; 102:537-546. [PMID: 28214288 DOI: 10.1002/cpt.672] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 01/23/2017] [Accepted: 02/14/2017] [Indexed: 12/25/2022]
Abstract
14 C-labeled YH4808, a novel potassium-competitive acid blocker, was intravenously administered as a microtracer at 80 μg (11.8 kBq or 320 nCi) concomitantly with the nonradiolabeled oral drug at 200 mg to determine the absolute bioavailability and to assess the effect of pharmacogenomics on the oral absorption of YH4808. The absolute bioavailability was low and highly variable (mean, 10.1%; range, 2.3-19.3%), and M3 and M8, active metabolites of YH4808, were formed 22.6- and 38.5-fold higher after oral administration than intravenous administration, respectively. The product of the fraction of an oral YH4808 dose entering the gut wall and the fraction of YH4808 passing on to the portal circulation was larger in subjects carrying the variants of the CHST3, SLC15A1, and SULT1B1 genes. A combined LC+AMS is a useful tool to construct a rich and highly informative pharmacokinetic knowledge core in early clinical drug development at a reasonable cost.
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Affiliation(s)
- A Kim
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea.,Clinical Trial Center, Ajou University Medical Center, Suwon, Korea
| | - B-Y Yu
- Korea Institute of Science and Technology, Seoul, Korea
| | | | - K-H Shin
- College of Pharmacy, Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, Korea
| | - H S Kim
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - H Ahn
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - J-Y Cho
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - K-S Yu
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - I-J Jang
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - H Lee
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea.,Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Korea
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13
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Seymour MA. Adding value through accelerator mass spectrometry-enabled first in human studies. J Labelled Comp Radiopharm 2016; 59:640-647. [PMID: 27444819 DOI: 10.1002/jlcr.3420] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 05/03/2016] [Accepted: 05/26/2016] [Indexed: 12/16/2022]
Abstract
Accelerator mass spectrometry (AMS) is an ultra-sensitive technique for the analysis of radiocarbon. It is applicable to bioanalysis of any 14 C-labelled analyte and any sample type. The increasing body of data generated using LC+AMS indicates that the methodology is robust and reliable, and capable of meeting the same validation criteria as conventional bioanalytical techniques. Because it is a tracer technique, AMS is capable of discriminating between an administered radiolabelled dose and endogenous compound or non-radiolabelled compound administered separately. This paper discusses how it can be used to enhance the design of first in human (FIH) clinical studies and generate significant additional data, including: fundamental pharmacokinetics (CL and V), absolute bioavailability, mass balance, routes and rates of excretion, metabolic fate (including first-pass metabolism, identification of biliary metabolites and quantitative data to address metabolite safety testing issues), and tissue disposition of parent compound and metabolites. Because the 14 C-labelled microtracer dose is administered at the same time as a pharmacologically relevant non-radiolabelled dose, there is no concern about dose-linearity. However the mass of the microtracer dose itself is negligible and therefore does not affect the outcome of the FIH study. The addition of microtracer doses to a FIH study typically requires little additional expense, apart from the AMS analytics, making the approach cost-effective. It can also save significant time, compared to conventional approaches, and, by providing reliable human in vivo data as early as possible, prevent unnecessary expenditure later in drug development.
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14
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Nijenhuis CM, Schellens JHM, Beijnen JH. Regulatory aspects of human radiolabeled mass balance studies in oncology: concise review. Drug Metab Rev 2016; 48:266-80. [PMID: 27186889 DOI: 10.1080/03602532.2016.1181081] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Human radiolabeled mass balance studies are performed to obtain information about the absorption, distribution, metabolism, and excretion of a drug in development. The main goals are to determine the route of elimination and major metabolic pathways. This review provides an overview of the current regulatory guidelines concerning human radiolabeled mass balance studies and discusses scientific trends seen in the last decade with a focus on mass balance studies of anticancer drugs. This paper also provides an overview of mass balance studies of anticancer agents that were executed in the last 10 years.
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Affiliation(s)
- C M Nijenhuis
- a Department of Pharmacy & Pharmacology , Antoni Van Leeuwenhoek/the Netherlands Cancer Institute and MC Slotervaart , Amsterdam , The Netherlands
| | - J H M Schellens
- b Department of Medical Oncology, Division of Clinical Pharmacology , The Netherlands Cancer Institute , Amsterdam , The Netherlands ;,c Department of Pharmaceutical Sciences, Division of Pharmacoepidemiology and Clinical Pharmacology, Faculty of Science , Utrecht University , Utrecht , The Netherlands
| | - J H Beijnen
- a Department of Pharmacy & Pharmacology , Antoni Van Leeuwenhoek/the Netherlands Cancer Institute and MC Slotervaart , Amsterdam , The Netherlands ;,c Department of Pharmaceutical Sciences, Division of Pharmacoepidemiology and Clinical Pharmacology, Faculty of Science , Utrecht University , Utrecht , The Netherlands
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15
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Opportunities in low-level radiocarbon microtracing: applications and new technology. Future Sci OA 2015; 2:FSO74. [PMID: 28031933 PMCID: PMC5137946 DOI: 10.4155/fso.15.74] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 08/20/2015] [Indexed: 12/14/2022] Open
Abstract
14C-radiolabeled (radiocarbon) drug studies are central to defining the disposition of therapeutics in clinical development. Concerns over radiation, however, have dissuaded investigators from conducting these studies as often as their utility may merit. Accelerator mass spectrometry (AMS), originally designed for carbon dating and geochronology, has changed the outlook for in-human radiolabeled testing. The high sensitivity of AMS affords human clinical testing with vastly reduced radiative (microtracing) and chemical exposures (microdosing). Early iterations of AMS were unsuitable for routine biomedical use due to the instruments' large size and associated per sample costs. The situation is changing with advances in the core and peripheral instrumentation. We review the important milestones in applied AMS research and recent advances in the core technology platform. We also look ahead to an entirely new class of 14C detection systems that use lasers to measure carbon dioxide in small gas cells.
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16
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Vlaming MLH, van Duijn E, Dillingh MR, Brands R, Windhorst AD, Hendrikse NH, Bosgra S, Burggraaf J, de Koning MC, Fidder A, Mocking JAJ, Sandman H, de Ligt RAF, Fabriek BO, Pasman WJ, Seinen W, Alves T, Carrondo M, Peixoto C, Peeters PAM, Vaes WHJ. Microdosing of a Carbon-14 Labeled Protein in Healthy Volunteers Accurately Predicts Its Pharmacokinetics at Therapeutic Dosages. Clin Pharmacol Ther 2015; 98:196-204. [PMID: 25869840 DOI: 10.1002/cpt.131] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 03/30/2015] [Accepted: 04/06/2015] [Indexed: 11/12/2022]
Abstract
Preclinical development of new biological entities (NBEs), such as human protein therapeutics, requires considerable expenditure of time and costs. Poor prediction of pharmacokinetics in humans further reduces net efficiency. In this study, we show for the first time that pharmacokinetic data of NBEs in humans can be successfully obtained early in the drug development process by the use of microdosing in a small group of healthy subjects combined with ultrasensitive accelerator mass spectrometry (AMS). After only minimal preclinical testing, we performed a first-in-human phase 0/phase 1 trial with a human recombinant therapeutic protein (RESCuing Alkaline Phosphatase, human recombinant placental alkaline phosphatase [hRESCAP]) to assess its safety and kinetics. Pharmacokinetic analysis showed dose linearity from microdose (53 μg) [(14) C]-hRESCAP to therapeutic doses (up to 5.3 mg) of the protein in healthy volunteers. This study demonstrates the value of a microdosing approach in a very small cohort for accelerating the clinical development of NBEs.
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Affiliation(s)
| | | | - M R Dillingh
- Centre for Human Drug Research, Leiden, The Netherlands, UK
| | - R Brands
- AMRIF BV, Wageningen, The Netherlands, UK
| | - A D Windhorst
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands, UK
| | - N H Hendrikse
- Department of Pharmacy and Clinical Pharmacology, VU University Medical Center, Amsterdam, The Netherlands, UK
| | | | - J Burggraaf
- Centre for Human Drug Research, Leiden, The Netherlands, UK
| | | | | | | | | | | | | | | | - W Seinen
- AMRIF BV, Wageningen, The Netherlands, UK.,Utrecht University, Utrecht, The Netherlands, UK
| | - T Alves
- GenIBET/IBET, Oeiras, Portugal
| | | | | | - P A M Peeters
- Centre for Human Drug Research, Leiden, The Netherlands, UK
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17
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Sensitivity-based analytical approaches to support human absolute bioavailability studies. Bioanalysis 2014; 6:497-504. [PMID: 24568352 DOI: 10.4155/bio.13.318] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The characterization of absolute bioavailability (BA) is useful for non-intravenous (iv.) formulations during drug development and is required by some health authorities. A study design of co-administrating an iv. isotopically labeled microdose with a therapeutic oral dose is a viable approach for the determination of human PK and has been accepted by regulatory agencies. The implementation of an iv.-microdose with oral therapeutic dose in absolute BA studies speeds up clinical development. In recent years, AMS to measure a radiolabeled microdose has been utilized to support several clinical absolute BA studies. An alternative approach for conducting microdose studies is using LC-MS/MS alone to quantitate both the iv. drug and the oral drug. Because both labeled and unlabeled drugs can be measured simultaneously with LC-MS/MS, it is cost effective. However, for compounds with high volume of distribution and/or poor LC-MS/MS response, AMS still provides a superior LLOQ. In this Perspective, we discuss a paradigm for selecting either an LC-MS/MS or AMS-based approach for generating concentration data in absolute BA studies dependent on the required sensitivity.
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18
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van Duijn E, Sandman H, Grossouw D, Mocking JAJ, Coulier L, Vaes WHJ. Automated Combustion Accelerator Mass Spectrometry for the Analysis of Biomedical Samples in the Low Attomole Range. Anal Chem 2014; 86:7635-41. [DOI: 10.1021/ac5015035] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
| | - Hugo Sandman
- TNO, P.O. Box 360, 3700AJ Zeist, The Netherlands
| | | | | | - Leon Coulier
- TNO, P.O. Box 360, 3700AJ Zeist, The Netherlands
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19
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In-house validation for the determination of honey adulteration with plant sugars (C4) by Isotope Ratio Mass Spectrometry (IR-MS). Lebensm Wiss Technol 2014. [DOI: 10.1016/j.lwt.2013.12.032] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Mass balance and metabolism of the antimalarial pyronaridine in healthy volunteers. Eur J Drug Metab Pharmacokinet 2014; 40:75-86. [DOI: 10.1007/s13318-014-0182-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Accepted: 02/21/2014] [Indexed: 11/26/2022]
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21
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Young GC, Seymour M, Dueker SR, Timmerman P, Arjomand A, Nozawa K. New frontiers-accelerator mass spectrometry (AMS): Recommendation for best practices and harmonization from Global Bioanalysis Consortium Harmonization Team. AAPS JOURNAL 2014; 16:357-9. [PMID: 24500278 DOI: 10.1208/s12248-014-9568-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Accepted: 01/09/2014] [Indexed: 11/30/2022]
Abstract
The technique of accelerator mass spectrometry (AMS) is applicable to the analysis of a wide range of trace elemental isotopes. However, in the context of the pharmaceutical industry, it is invariably used to measure radiocarbon ((14)C). There are two broad modes of application: analysis of total (14)C sometimes termed "direct AMS" and analysis of specific (14)C-labelled analytes in a variety of matrices following some method of isolation. It is the latter application which is within the remit of the GBC team, and the team has made efforts to propose harmonized recommendations for the validation of AMS when used in a regulatory bioanalytical mode, i.e. the quantification of specific analyte(s) using liquid chromatography with off-line detection by AMS now known as "LC + AMS". The GBC team has reached a position where they have agreed to many aspects, but also differ on some aspects of what constitutes a bioanalytical assay validation in support of clinical studies using this technology. The detail of most of this will be covered under separate publication(s), but for the purposes of this paper, we have outlined the points of consensus. The purpose of this article is not to provide a roadmap for validation of LC + AMS assays, but to highlight agreements amongst the industry representative experts and the practitioners, as well as identifying specific areas essential for establishing assay quality but where additional discussion is required to reach agreement.
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Affiliation(s)
- Graeme C Young
- David Jack Centre, GlaxoSmithKline Research and Development Ltd., Park Road, Ware, Herts, SG12 0DP, UK,
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22
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How the accelerator MS community are trying to fit into the regulatory framework: are the Bioanalytical Method Validation guidances relevant? Bioanalysis 2013; 5:861-4. [DOI: 10.4155/bio.13.48] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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23
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Overcoming bioanalytical challenges in an Onglyza(®) intravenous [(14)C]microdose absolute bioavailability study with accelerator MS. Bioanalysis 2013; 4:1855-70. [PMID: 22943617 DOI: 10.4155/bio.12.171] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND An absolute bioavailability study that utilized an intravenous [(14)C]microdose was conducted for saxagliptin (Onglyza(®)), a marketed drug product for the treatment of Type 2 diabetes mellitus. Concentrations of [(14)C]saxagliptin were determined by accelerator MS (AMS) after protein precipitation, chromatographic separation by UPLC and analyte fraction collection. A series of investigative experiments were conducted to maximize the release of the drug from high-affinity receptors and nonspecific adsorption, and to determine a suitable quantitation range. RESULTS A technique-appropriate validation demonstrated the accuracy, precision, specificity, stability and recovery of the AMS methodology across the concentration range of 0.025 to 15.0 dpm/ml (disintegration per minute per milliliter), the equivalent of 1.91-1144 pg/ml. Based on the study sample analysis, the mean absolute bioavailability of saxagliptin was 50% in the eight subjects with a CV of 6.6%. Incurred sample reanalysis data fell well within acceptable limits. CONCLUSION This study demonstrated that the optimized sample pretreatment and chromatographic separation procedures were critical for the successful implementation of an UPLC plus AMS method for [(14)C]saxagliptin. The use of multiple-point standards are useful, particularly during method development and validation, to evaluate and correct for concentration-dependent recovery, if observed, and to monitor and control process loss and operational variations.
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24
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Abstract
Clinical mass balance studies aim to investigate the absorption, distribution, metabolism and excretion (ADME) of a(n) (often radiolabeled) drug, following a single administration to humans. They are perfectly suited to determine the disposition and major metabolic pathways of a drug, the exposure to the parent drug and its metabolites, and the rate and route of elimination. A mass balance study, however, poses interesting challenges to the analysis of parent drug and metabolites in different biological matrices. Using recent clinical mass balance studies in oncology as an example, this review focuses on the aspects of mass balance studies, from bioanalytical assay development, analysis of clinical samples to reporting of study results. Along the way, it discusses bioanalytical problems and practical solutions.
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25
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Gao L, Li J, Kasserra C, Song Q, Arjomand A, Hesk D, Chowdhury SK. Precision and Accuracy in the Quantitative Analysis of Biological Samples by Accelerator Mass Spectrometry: Application in Microdose Absolute Bioavailability Studies. Anal Chem 2011; 83:5607-16. [DOI: 10.1021/ac2006284] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Qi Song
- Accium BioSciences, Inc., Seattle, Washington 98122, United States
| | - Ali Arjomand
- Accium BioSciences, Inc., Seattle, Washington 98122, United States
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26
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AMS method validation for quantitation in pharmacokinetic studies with concomitant extravascular and intravenous administration. Bioanalysis 2011; 3:393-405. [DOI: 10.4155/bio.11.5] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A technique has emerged in the past few years that has enabled a drug’s intravenous pharmacokinetics to be readily obtained in humans without having to conduct extensive toxicology studies by this route of administration or expend protracted effort in formulation. The technique involves the intravenous administration of a low dose of 14C-labelled drug (termed a tracer dose) concomitantly with a non-labelled extravascular dose given at therapeutically levels. Plasma samples collected over time are analysed to determine the total parent drug concentration by LC–MS (which essentially measures that arising from the oral dose) and by LC followed by accelerator mass spectrometry (AMS) to determine the 14C-drug concentration (i.e., that arising from the intravenous dose). There are currently no published accounts of how the principles of bioanalytical validation might be applied to intravenous studies using AMS as an analytical technique. The authors describe the primary elements of AMS when used with LC seperation and how this off-line technique differs from LC–MS. They then discuss how the principles of bioanalytical validation might be applied to determine selectivity, accuracy, precision and stability of methods involving LC followed by AMS analysis.
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27
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Early human ADME using microdoses and microtracers: bioanalytical considerations. Bioanalysis 2010; 2:441-54. [DOI: 10.4155/bio.10.8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Quantitative assessment of metabolites of drug candidates in early-phase clinical development presents an analytical challenge when methods, standards and assays are not yet available. Radioisotopic labeling, principally with radiocarbon (14C), is the preferred method for discovering and quantifying the absolute yields of metabolites in the absence of reference material or a priori knowledge of the human metabolism. However, the detection of 14C is inefficient by decay counting methods and, as a result, high radiological human 14C-doses had been needed to assure sensitive detection of metabolites over time. High radiological doses and the associated costs have been a major obstacle to the routine (and early) use of 14C despite the recognized advantages of a 14C-tracer for quantifying drug metabolism and disposition. Accelerator mass spectrometry eliminates this long-standing problem by reducing radioactivity levels while delivering matrix-independent quantitation to attomole levels of sensitivity in small samples or fractionated isolates. Accelerator mass spectrometry and trace 14C-labeled drugs are now used to obtain early insights into the human metabolism of a drug candidate in ways that were not previously practical. With this article we describe some of our empirically based approaches for regualted bioanalysis and offer perspectives on current applications and opportunities for the future.
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28
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Accelerator mass spectrometry best practices for accuracy and precision in bioanalytical 14C measurements. Bioanalysis 2010; 2:455-68. [DOI: 10.4155/bio.10.13] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Accelerator mass spectrometers have an energy acceleration and charge exchange between mass definition stages to destroy molecular isobars and allow single ion counting of long-lived isotopes such as 14C (t½=5370 years.). ‘Low’ voltage accelerations to 200 kV allow laboratory-sized accelerator mass spectrometers instruments for bioanalytical quantitation of 14C to 2–3% precision and accuracy in isolated biochemical fractions. After demonstrating this accuracy and precision for our new accelerator mass spectrometer, we discuss the critical aspects of maintaining quantitative accuracy from the defined biological fraction to the accelerator mass spectrometry quantitation. These aspects include sufficient sample mass for routine rapid sample preparation, isotope dilution to assure this mass, isolation of the carbon from other sample combustion gasses and use of high-efficiency biochemical separations. This review seeks to address a bioanalytical audience, who should know that high accuracy data of physiochemical processes within living human subjects are available, as long as a 14C quantitation can be made indicative of the physiochemistry of interest.
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