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Zhang N, Chan ML, Li J, Brohawn PZ, Sun B, Vainshtein I, Roskos LK, Faggioni R, Savic RM. Combining pharmacometric models with predictive and prognostic biomarkers for precision therapy in Crohn's disease: A case study of brazikumab. CPT Pharmacometrics Syst Pharmacol 2023; 12:1945-1959. [PMID: 37691451 PMCID: PMC10725267 DOI: 10.1002/psp4.13044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 06/11/2023] [Accepted: 07/11/2023] [Indexed: 09/12/2023] Open
Abstract
Pharmacometric models were used to investigate the utility of biomarkers in predicting the efficacy (Crohn's Disease Activity Index [CDAI]) of brazikumab and provide a data-driven framework for precision therapy for Crohn's disease (CD). In a phase IIa trial in patients with moderate to severe CD, treatment with brazikumab, an anti-interleukin 23 monoclonal antibody, was associated with clinical improvement. Brazikumab treatment effect was determined to be dependent on the baseline IL-22 (BIL22) or baseline C-reactive protein (BCRP; predictive biomarkers), and placebo effect was found to be correlated with the baseline CDAI (a prognostic biomarker). A maximal total inhibition on CDAI input function of 50.6% and 42.4% was predicted for patients with extremely high BIL22 or BCRP, compared to a maximal total inhibition of 20.9% and 17.8% for patients with extremely low BIL22 or BCRP, respectively, which were mainly due to the placebo effect. We demonstrated that model-derived baseline biomarker levels that achieve 50% of maximum unbound systemic concentration of 22.8 pg/mL and 8.03 mg/L for BIL22 and BCRP as the cutoffs to select subpopulations can effectively identify high-response subgroup patients with improved separation of responders when compared to using the median values as the cutoff. This work exemplifies the utility of pharmacometrics to quantify biomarker-driven responses in biologic therapies and distinguish between predictive and prognostic biomarkers, complementing clinical efforts of identifying subpopulations with higher likelihood of response to brazikumab.
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Affiliation(s)
- Nan Zhang
- Department of Bioengineering and Therapeutic SciencesUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Ming Liang Chan
- Department of Bioengineering and Therapeutic SciencesUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Jing Li
- Clinical Pharmacology and Quantitative Pharmacology, Clinical Pharmacology & Safety Sciences (CPSS), R&D, AstraZenecaSouth San FranciscoCaliforniaUSA
| | - Philip Z. Brohawn
- Translational Science and Experimental Medicine, Research and Early Development, Respiratory and Immunology (R&I), BioPharmaceutical R&D, AstraZenecaGaithersburgMarylandUSA
| | - Bo Sun
- Clinical Pharmacology and Quantitative Pharmacology, Clinical Pharmacology & Safety Sciences (CPSS), R&D, AstraZenecaSouth San FranciscoCaliforniaUSA
| | - Inna Vainshtein
- Clinical Pharmacology and Quantitative Pharmacology, Clinical Pharmacology & Safety Sciences (CPSS), R&D, AstraZenecaSouth San FranciscoCaliforniaUSA
| | - Lorin K. Roskos
- Clinical Pharmacology and Quantitative Pharmacology, Clinical Pharmacology & Safety Sciences (CPSS), R&D, AstraZenecaSouth San FranciscoCaliforniaUSA
| | - Raffaella Faggioni
- Clinical Pharmacology and Quantitative Pharmacology, Clinical Pharmacology & Safety Sciences (CPSS), R&D, AstraZenecaSouth San FranciscoCaliforniaUSA
| | - Rada M. Savic
- Department of Bioengineering and Therapeutic SciencesUniversity of California San FranciscoSan FranciscoCaliforniaUSA
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2
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Myler H, Pedras-Vasconcelos J, Lester T, Civoli F, Xu W, Wu B, Vainshtein I, Luo L, Hassanein M, Liu S, Ramaswamy SS, Mora J, Pennucci J, McCush F, Lavelle A, Jani D, Ambakhutwala A, Baltrukonis D, Barker B, Carmean R, Chung S, Dai S, DeWall S, Dholakiya SL, Dodge R, Finco D, Yan H, Hays A, Hu Z, Inzano C, Kamen L, Lai CH, Meyer E, Nelson R, Paudel A, Phillips K, Poupart ME, Qu Q, Abhari MR, Ryding J, Sheldon C, Spriggs F, Warrino D, Wu Y, Yang L, Pasas-Farmer S. Neutralizing Antibody Validation Testing and Reporting Harmonization. AAPS J 2023; 25:69. [PMID: 37421491 DOI: 10.1208/s12248-023-00830-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 06/05/2023] [Indexed: 07/10/2023] Open
Abstract
Evolving immunogenicity assay performance expectations and a lack of harmonized neutralizing antibody validation testing and reporting tools have resulted in significant time spent by health authorities and sponsors on resolving filing queries. A team of experts within the American Association of Pharmaceutical Scientists' Therapeutic Product Immunogenicity Community across industry and the Food and Drug Administration addressed challenges unique to cell-based and non-cell-based neutralizing antibody assays. Harmonization of validation expectations and data reporting will facilitate filings to health authorities and are described in this manuscript. This team provides validation testing and reporting strategies and tools for the following assessments: (1) format selection; (2) cut point; (3) assay acceptance criteria; (4) control precision; (5) sensitivity including positive control selection and performance tracking; (6) negative control selection; (7) selectivity/specificity including matrix interference, hemolysis, lipemia, bilirubin, concomitant medications, and structurally similar analytes; (8) drug tolerance; (9) target tolerance; (10) sample stability; and (11) assay robustness.
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Affiliation(s)
- Heather Myler
- Bioanalytical and Biomarker Science and Technologies, Takeda, Cambridge, MA, 02139, USA.
- 25 Creekview Ln, Yardley, Pennsylvania, 19067, USA.
| | - João Pedras-Vasconcelos
- Office of Biotechnology Products, Office of Pharmaceutical Quality, Center for Drugs Evaluation and Research, Food and Drug Administration, Silver Spring, MD, 20903, USA
| | - Todd Lester
- BioAgilytix Labs, Durham, North Carolina, 27713, USA
| | - Francesca Civoli
- Coherus BioSciences, 333 Twin Dolphin Drive, Redwood City, California, 94065, USA
| | - Weifeng Xu
- Regulated Global Bioanalytics, Merck & Co., Inc, Rahway, New Jersey, 07065, USA
| | - Bonnie Wu
- Bioanalytical Discovery and Development Sciences, Janssen Research and Development, Spring House, Pennsylvania, 19477, USA
| | - Inna Vainshtein
- Discovery and Translational Research, Exelixis, 1851 Harbor Bay Pkwy, Alameda, California, 94502, USA
| | - Linlin Luo
- Regulated Global Bioanalytics, Merck & Co., Inc, Rahway, New Jersey, 07065, USA
| | - Mohamed Hassanein
- Early Clinical Development, Precision Medicine, Pfizer Inc, Cambridge, Massachusetts, USA
| | - Susana Liu
- Global Product Development, , Pfizer Inc, 17300 Trans Canada Hwy, Kirkland, Quebec, Canada
| | - Swarna Suba Ramaswamy
- Regulated Bioanalysis Department, B2S Life Sciences, 97 East Monroe Street, Franklin, Indiana, 46131, USA
| | - Johanna Mora
- Non-Clinical Disposition and Bioanalysis, Bristol Myers Squibb, Princeton, New Jersey, USA
| | - Jason Pennucci
- Quantitative Bioanalytics, Moderna, 200 Technology Square, Cambridge, Massachusetts, 02139, USA
| | - Fred McCush
- Clinical Pharmacology, Pfizer Inc, Eastern Point Road, Groton, CT, 06379, USA
| | - Amy Lavelle
- Bioanalytical Lab, PPD Clinical Research, , 2244 Dabney Road, Richmond, Virginia, 23230-3323, USA
| | - Darshana Jani
- Preclinical and Clinical Bioanalysis, , Moderna Tx, 200 Technology Square, Cambridge, Massachusetts, 02142, USA
| | - Angela Ambakhutwala
- Immunology Sciences, Kriya Therapeutics, 4105 Hopson Road, Morrisville, North Carolina, 27560, USA
| | - Daniel Baltrukonis
- Clinical Pharmacology, Pfizer Inc, Eastern Point Road, Groton, CT, 06379, USA
| | - Breann Barker
- Drug Metabolism and Biopharmaceuticals, Incyte Corporation, 1801 Augustine Cut-Off, Wilmington, Delaware, 19803, USA
| | - Rebecca Carmean
- Bioanalytical Lab, PPD Clinical Research, , 2244 Dabney Road, Richmond, Virginia, 23230-3323, USA
| | - Shan Chung
- Department of BioAnalytical Sciences, Genentech Inc, South San Francisco, California, USA
| | - Sheng Dai
- Quantitative Clinical Pharmacology & Translational Sciences (QCP), Daiichi Sankyo, Inc, 211 Mt. Airy Road, Basking Ridge, New Jersey, 07920, USA
| | - Stephen DeWall
- Bioanalytical Sciences, Scholar Rock, 301 Binney Street, 3rd Floor, Cambridge, Massachusetts, 02142-1071, USA
| | - Sanjay L Dholakiya
- Non-Clinical Disposition and Bioanalysis, Bristol Myers Squibb, Princeton, New Jersey, USA
| | - Robert Dodge
- Novartis Institutes for BioMedical Research, 1 Health Plaza, East Hanover, New Jersey, 07936, USA
| | - Deborah Finco
- Deborah Finco Consulting LLC, 101 Prospect Hill Road, Groton, Connecticut, 06340, USA
| | - Haoheng Yan
- Global Regulatory Affairs, Shanghai Henlius Biotech. Inc, 430 N. McCarthy Blvd, Milpitas, California, 95035, USA
| | - Amanda Hays
- BioAgilytix Labs, Durham, North Carolina, 27713, USA
| | - Zheng Hu
- Translation Safety & Bioanalytical Science, Amgen Inc, Thousand Oaks, California, 91360, USA
| | - Cynthia Inzano
- Non-Clinical Disposition and Bioanalysis, Bristol Myers Squibb, Princeton, New Jersey, USA
| | - Lynn Kamen
- BioAgilytix Labs, Durham, North Carolina, 27713, USA
| | - Ching-Ha Lai
- Bioanalytical Sciences, Regeneron Pharmaceuticals, Tarrytown, New York, USA
| | - Erik Meyer
- Immunogenicity, GSK Pharmaceuticals, 1250 South Collegeville Road, Collegeville, Pennsylvania, 19426, USA
| | - Robert Nelson
- Bioanalytical Services, Labcorp Drug Development, Otley Road, Harrogate, HG3 1PY, UK
| | - Amrit Paudel
- Research Center Pharmaceutical Engineering GmbH (RCPE), Inffeldgasse 13, 8010, Graz, Austria
| | - Kelli Phillips
- Clinical Pharmacology, Pfizer Inc, Eastern Point Road, Groton, CT, 06379, USA
| | - Marie-Eve Poupart
- Immunology, Charles River Laboratories, Montreal ULC, Transcanada Highway, Senneville, Quebec, 22022, Canada
| | - Qiang Qu
- Quantitative Bioanalytics, Moderna, 200 Technology Square, Cambridge, Massachusetts, 02139, USA
| | - Mohsen Rajabi Abhari
- Office of Clinical PharmacologyOffice of Translational SciencesCenter for Drugs Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, 20903, USA
| | - Janka Ryding
- Bioanalysis-Biologics, Lundbeck A/S, Ottiliavej 9, 2500, Valby, Denmark
| | - Curtis Sheldon
- Technical Operations, , IVERIC Bio, Inc, 8 Sylvan Way, Parsippany, New Jersey, 07054, USA
| | - Franklin Spriggs
- Spriggs Bioanalytical Consulting LLC, 15632 W 83rd Terrace, Lenexa, Kansas, 66219, USA
| | - Dominic Warrino
- Bioanalytical and Biomarker Services, KCAS, 10830 S Clay Blair Blvd, Olathe, Kansas, 66061, USA
| | - Yuling Wu
- Integrated Bioanalysis, , AstraZeneca, Gaithersburg, Maryland, 20878, USA
| | - Lin Yang
- Bioanalytical Sciences, REGENXBIO Inc, 9804 Medical Center Drive, Rockville, Maryland, 20850, USA
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3
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Jani D, Marsden R, Gunsior M, Hay LS, Ward B, Cowan KJ, Azadeh M, Barker B, Cao L, Closson KR, Coble K, Dholakiya SL, Dusseault J, Hays A, Herl C, Hodsdon ME, Irvin SC, Kirshner S, Kolaitis G, Kulagina N, Kumar S, Lai CH, Lipari F, Liu S, Merdek KD, Moldovan IR, Mozaffari R, Pan L, Place C, Snoeck V, Manning MS, Stocker D, Tary-Lehmann M, Turner A, Vainshtein I, Verthelyi D, Williams WT, Yan H, Yan W, Yang L, Yang L, Zemo J, Zhong ZD. Anti-drug Antibody Sample Testing and Reporting Harmonization. AAPS J 2022; 24:113. [PMID: 36307592 DOI: 10.1208/s12248-022-00762-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Accepted: 10/07/2022] [Indexed: 11/24/2022] Open
Abstract
A clear scientific and operational need exists for harmonized bioanalytical immunogenicity study reporting to facilitate communication of immunogenicity findings and expedient review by industry and health authorities. To address these key bioanalytical reporting gaps and provide a report structure for documenting immunogenicity results, this cross-industry group was formed to establish harmonized recommendations and a develop a submission template to facilitate agency filings. Provided here are recommendations for reporting clinical anti-drug antibody (ADA) assay results using ligand-binding assay technologies. This publication describes the essential bioanalytical report (BAR) elements such as the method, critical reagents and equipment, study samples, results, and data analysis, and provides a template for a suggested structure for the ADA BAR. This publication focuses on the content and presentation of the bioanalytical ADA sample analysis report. The interpretation of immunogenicity data, including the evaluation of the impact of ADA on safety, exposure, and efficacy, is out of scope of this publication.
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Affiliation(s)
- Darshana Jani
- Bioanalytical and Molecular Assays, Moderna, Cambridge, Massachusetts, USA.
| | | | - Michele Gunsior
- Research and Translational Sciences, Astria Therapeutics, Boston, Massachusetts, USA
| | - Laura Schild Hay
- Bioanalytical Lab, PPD Clinical Research Services, Thermo Fisher Scientific, Richmond, Virginia, USA
| | - Bethany Ward
- Bioanalytical Lab, PPD Clinical Research Services, Thermo Fisher Scientific, Richmond, Virginia, USA
| | - Kyra J Cowan
- New Biological Entities Drug Metabolism and Pharmacokinetics, Merck KGaA, Darmstadt, Germany
| | - Mitra Azadeh
- Biomarker Operations, Translational Medicine and Early Stage Clinical Development, Alkermes, Inc., Waltham, Massachusetts, USA
| | - Breann Barker
- Drug Metabolism and Biopharmaceuticals, Incyte Corporation, Wilmington, Delaware, USA
| | - Liching Cao
- Biomarker and BioAnalytical Sciences, Sangamo Therapeutics, California, USA
| | - Kristin R Closson
- Laboratory Operations, Immunologix Laboratories, Tampa, Florida, USA
| | - Kelly Coble
- DMPK/Bioanalytical Sciences, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut, USA
| | - Sanjay L Dholakiya
- Non-Clinical Disposition and Bioanalysis, Bristol Myers Squibb, Princeton, New Jersey, USA
| | - Julie Dusseault
- Laboratory Sciences, Charles River Laboratories, Quebec, Canada
| | | | - Carina Herl
- Clinical Pharmacology and Translational Sciences, Exelixis, Alameda, California, USA
| | - Michael E Hodsdon
- Laboratory for Experimental Medicine, Eli Lilly and Company, Indianapolis, Indiana, USA
| | - Susan C Irvin
- Bioanalytical Sciences, Regeneron Pharmaceuticals, Tarrytown, New York, USA
| | - Susan Kirshner
- Office of Biotechnology Products, Office of Pharmaceutical Quality, Center for Drugs Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA
| | - Gerry Kolaitis
- Non-Clinical Disposition and Bioanalysis, Bristol Myers Squibb, Princeton, New Jersey, USA
| | - Nadia Kulagina
- Pharmaceutical Development Services, Smithers, Gaithersburg, Maryland, USA
| | - Seema Kumar
- EMD Serono Research and Development Institute (A business of Merck KGaA, Darmstadt, Germany), Billerica, Massachusetts, USA
| | - Ching Ha Lai
- Bioanalytical Sciences, Regeneron Pharmaceuticals, Tarrytown, New York, USA
| | - Francesco Lipari
- Nexelis, a Q2 Solutions Company, Vaccine Sciences, Laval, Quebec, Canada
| | - Susana Liu
- Global Product Development, Clinical Assay Group, Pfizer Inc., Kirkland, Quebec, Canada
| | - Keith D Merdek
- Biomarkers and Clinical Bioanalyses (TMED), Sanofi, Framingham, Massachusetts, USA
| | | | - Reza Mozaffari
- Bioanalysis, Immunogenicity and Biomarkers (BIB), IVIVT, Research, GSK, Collegeville, Pennsylvania, USA
| | - Luying Pan
- Clinical Biomarker Innovation and Development, Takeda Development Center Americas Inc., Cambridge, Massachusetts, USA
| | - Corina Place
- DMPK/Bioanalytical Sciences, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Connecticut, USA
| | - Veerle Snoeck
- Translational Biomarkers and Bioanalysis, UCB Biopharma SRL, Braine-l'Alleud, Belgium
| | | | - Dennis Stocker
- Non-Clinical Disposition and Bioanalysis, Bristol Myers Squibb, Princeton, New Jersey, USA
| | | | - Amy Turner
- Pharmaceutical Development Services, Smithers, Gaithersburg, Maryland, USA
| | - Inna Vainshtein
- Clinical Pharmacology and Translational Sciences, Exelixis, Alameda, California, USA
| | - Daniela Verthelyi
- Office of Biotechnology Products, Office of Pharmaceutical Quality, Center for Drugs Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA
| | | | - Haoheng Yan
- Office of Biotechnology Products, Office of Pharmaceutical Quality, Center for Drugs Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA
| | - Weili Yan
- Department of Bioanalytical Sciences, Genentech, South San Francisco, California, USA
| | - Lili Yang
- Clinical Biomarker Innovation and Development, Takeda Development Center Americas Inc., Cambridge, Massachusetts, USA
| | - Lin Yang
- Bioanalytical Sciences, REGENXBIO Inc., Rockville, Maryland, USA
| | - Jennifer Zemo
- Bioanalytical Operations, BioAgilytix Labs, Durham, North Carolina, USA
| | - Zhandong Don Zhong
- Development Sciences, Denali Therapeutics, South San Francisco, California, USA
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Shah NN, Schneiderman J, Kuruvilla D, Bhojwani D, Fry TJ, Martin PL, Schultz KR, Silverman LB, Whitlock JA, Wood B, Vainshtein I, Adams A, Confer D, Pulsipher MA, Chaudhury S, Wayne AS. Fatal capillary leak syndrome in a child with acute lymphoblastic leukemia treated with moxetumomab pasudotox for pre-transplant minimal residual disease reduction. Pediatr Blood Cancer 2021; 68:e28574. [PMID: 32959985 DOI: 10.1002/pbc.28574] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 06/26/2020] [Indexed: 12/21/2022]
Affiliation(s)
- Nirali N Shah
- Pediatric Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Jennifer Schneiderman
- Pediatric Hematology, Oncology and Stem Cell Transplantation, Ann & Robert H. Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Denison Kuruvilla
- Clinical Pharmacology and Safety Sciences, AstraZeneca, San Francisco, California
| | - Deepa Bhojwani
- Pediatric Hematology-Oncology, Children's Hospital Los Angeles, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Terry J Fry
- Pediatric Oncology, Children's Hospital Colorado, Denver, Colorado
| | - Paul L Martin
- Pediatric Oncology, Duke University Medical Center, Durham, North Carolina
| | - Kirk R Schultz
- Division of Hematology and Oncology, British Columbia Children's Hospital, Vancouver, British Columbia, Canada
| | - Lewis B Silverman
- Pediatric Hematology and Oncology, Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - James A Whitlock
- Hematology/Oncology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Brent Wood
- Department of Pathology, University of Washington, Seattle, Washington
| | - Inna Vainshtein
- Clinical Pharmacology and Safety Sciences, AstraZeneca, San Francisco, California
| | - Alexia Adams
- National Marrow Donor Program/Be the Match, Minneapolis, Minnesota
| | - Dennis Confer
- National Marrow Donor Program/Be the Match, Minneapolis, Minnesota.,Center for International Blood and Marrow Transplant Research, Minneapolis, Minnesota
| | - Michael A Pulsipher
- Pediatric Hematology-Oncology, Children's Hospital Los Angeles, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
| | - Sonali Chaudhury
- Pediatric Hematology, Oncology and Stem Cell Transplantation, Ann & Robert H. Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Alan S Wayne
- Pediatric Hematology-Oncology, Children's Hospital Los Angeles, Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, California
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Liang M, Wang B, Schneider A, Vainshtein I, Roskos L. A Novel Pharmacodynamic Biomarker and Mechanistic Modeling Facilitate the Development of Tovetumab, a Monoclonal Antibody Directed Against Platelet-Derived Growth Factor Receptor Alpha, for Cancer Therapy. AAPS J 2020; 23:4. [PMID: 33210183 DOI: 10.1208/s12248-020-00523-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 10/09/2020] [Indexed: 11/30/2022]
Abstract
Tovetumab (MEDI-575) is a fully human IgG2κ monoclonal antibody that specifically binds to human platelet-derived growth factor receptor alpha (PDGFRα) and blocks receptor signal transduction by PDGF ligands. The affinity of tovetumab determined using surface plasmon resonance technology and flow cytometry demonstrated comparable binding affinity for human and monkey PDGFRα. In single and repeat-dose monkey pharmacokinetic-pharmacodynamic (PK-PD) studies, tovetumab administration resulted in dose-dependent elevation of circulating levels of PDGF-AA, a member of the PDGF ligand family, due to displacement of PDGF-AA from PDGFRα by tovetumab and subsequent blockade of PDGFRα-mediated PDGF-AA degradation. As such, PDGF-AA accumulation is an indirect measurement of receptor occupancy and is a novel PD biomarker for tovetumab. The nonlinear PK of tovetumab and dose-dependent increase in circulating PDGF-AA profiles were well described by a novel mechanistic model, in which tovetumab and PDGF-AA compete for the binding to PDGFRα. To facilitate translational simulation, the internalization half-lives of PDGF-AA and tovetumab upon binding to PDGFRα were determined using confocal imaging to be 14 ± 4 min and 30 ± 8 min, respectively. By incorporating PDGFRα internalization kinetics, the model not only predicted the target receptor occupancy by tovetumab, but also the biologically active agonistic ligand-receptor complex. This work described a novel PD biomarker approach applicable for anti-receptor therapeutics and the first mechanistic model to delineate the in vivo tri-molecular system of a drug, its target receptor, and a competing endogenous ligand, which collectively have been used for optimal dose recommendation supporting clinical development of tovetumab.
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Affiliation(s)
- Meina Liang
- Clinical and Quantitative Pharmacology, BioPharmaceuticals Research and Development, AstraZeneca, 121 Oyster Point Blvd., South San Francisco, California, 94080, USA.
| | - Bing Wang
- Clinical and Quantitative Pharmacology, BioPharmaceuticals Research and Development, AstraZeneca, 121 Oyster Point Blvd., South San Francisco, California, 94080, USA.,Amador Bioscience, Pleasanton, California, 94588, USA
| | - Amy Schneider
- Clinical and Quantitative Pharmacology, BioPharmaceuticals Research and Development, AstraZeneca, 121 Oyster Point Blvd., South San Francisco, California, 94080, USA.,The University of Texas MD Anderson Cancer Center, Houston, Texas, 77030, USA
| | - Inna Vainshtein
- Clinical and Quantitative Pharmacology, BioPharmaceuticals Research and Development, AstraZeneca, 121 Oyster Point Blvd., South San Francisco, California, 94080, USA.,Exelixis, Alameda, California, 94502, USA
| | - Lorin Roskos
- Clinical and Quantitative Pharmacology, BioPharmaceuticals Research and Development, AstraZeneca, 121 Oyster Point Blvd., South San Francisco, California, 94080, USA. .,Exelixis, Alameda, California, 94502, USA.
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Shah NN, Bhojwani D, August K, Baruchel A, Bertrand Y, Boklan J, Dalla-Pozza L, Dennis R, Hijiya N, Locatelli F, Martin PL, Mechinaud F, Moppett J, Rheingold SR, Schmitt C, Trippett TM, Liang M, Balic K, Li X, Vainshtein I, Yao NS, Pastan I, Wayne AS. Results from an international phase 2 study of the anti-CD22 immunotoxin moxetumomab pasudotox in relapsed or refractory childhood B-lineage acute lymphoblastic leukemia. Pediatr Blood Cancer 2020; 67:e28112. [PMID: 31944549 PMCID: PMC7485266 DOI: 10.1002/pbc.28112] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/11/2019] [Accepted: 11/10/2019] [Indexed: 01/04/2023]
Abstract
BACKGROUND In a multicenter phase 1 study of children with relapsed/refractory acute lymphoblastic leukemia (ALL), moxetumomab pasudotox, an anti-CD22 immunotoxin, demonstrated a manageable safety profile and preliminary evidence of clinical activity. A phase 2 study further evaluated efficacy. PROCEDURE This international, multicenter, phase 2 study enrolled children with relapsed/refractory B-cell precursor ALL who received moxetumomab pasudotox 40 µg/kg intravenously every other day, for six doses per 21-day cycle. The primary objective was to evaluate the complete response (CR) rate. Secondary objectives included safety, pharmacokinetics, and immunogenicity evaluations. RESULTS Thirty-two patients (median age, 10 years) were enrolled at 16 sites; 30 received study drug and were evaluable for safety; 28 were evaluable for response. The objective response rate was 28.6%, with three patients (10.7%) achieving morphologic CR, and five patients (17.9%) achieving partial response. Disease progression occurred in 11 patients (39.3%). Ten patients (33.3%) experienced at least one treatment-related serious adverse event, including capillary leak syndrome (CLS; n = 6), hemolytic uremic syndrome (HUS; n = 4), and treatment-related death (n = 1) from pulmonary edema. No differences were observed in inflammatory markers in patients who did or did not develop CLS or HUS. CONCLUSIONS Despite a signal for clinical activity, this phase 2 study was terminated at interim analysis for a CR rate that did not reach the stage 1 target. Preclinical data suggest enhanced efficacy of moxetumomab pasudotox via continuous infusion or in combination regimens; thus, further studies designed to optimize the efficacy and safety of moxetumomab pasudotox in pediatric ALL may be warranted.
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Affiliation(s)
- Nirali N. Shah
- National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Deepa Bhojwani
- Children’s Hospital Los Angeles, USC Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | | | - André Baruchel
- Robert Debré Hospital (APHP and University Paris Diderot), Paris, France
| | - Yves Bertrand
- CHU Institut d’Hématologie et Oncologie Pédiatrique, Lyon, France
| | | | | | - Robyn Dennis
- Nationwide Children’s Hospital, Columbus, OH, USA
| | - Nobuko Hijiya
- Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, IL, USA
| | - Franco Locatelli
- IRCCS Ospedale Pediatrico Bambino Gesù, Sapienza, University of Rome, Rome, Italy
| | - Paul L. Martin
- Duke Children’s Hospital & Health Center, Durham, NC, USA
| | - Françoise Mechinaud
- Children’s Cancer Centre, The Royal Children’s Hospital, Melbourne, Australia
| | | | | | | | | | | | | | - Xia Li
- AstraZeneca, Gaithersburg, MD, USA
| | | | | | - Ira Pastan
- National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Alan S. Wayne
- Children’s Hospital Los Angeles, USC Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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7
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Vainshtein I, Sun B, Roskos LK, Liang M. A novel approach to assess domain specificity of anti-drug antibodies to moxetumomab pasudotox, an immunotoxin with two functional domains. J Immunol Methods 2020; 477:112688. [PMID: 31676342 DOI: 10.1016/j.jim.2019.112688] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2019] [Revised: 08/23/2019] [Accepted: 10/22/2019] [Indexed: 11/28/2022]
Abstract
Biologics are potentially immunogenic and can elicit immune response. Complex biologics, such as bispecific antibodies or multi-domain molecules can induce anti-drug antibodies (ADA) with specificity to different domains. Domain specific ADAs may differently affect drug efficacy and safety, and thus, characterization of ADA domain specificity has become a regulatory expectation for multi-domain biologics. Unlike well-established methods for screening, confirmation, titer and neutralizing ADA detection, characterization of ADA domain specificity is an emerging field. The conventional approach for determination of ADA domain specificity is a competitive inhibition with domain-containing molecules. When developing a conventional domain specificity assay for moxetumomab pasudotox, a recombinant anti-CD22 immunotoxin, comprised of two functional domains (CD22-binding fragment and truncated Pseudomonas exotoxin A (PE38), we encountered a bioanalytical challenge. The method was able to detect immunodominant anti-PE38 (ADA-PE) but generated false negative results for low abundant CD22-binding domain ADA (ADA-BD) in a polyclonal sample. Troubleshooting experiments using control samples with varying levels of each ADA subtype demonstrated that a major factor for successful ADA identification was the ratio of the ADA signals contributed by each ADA subtype. To overcome this unique bioanalytical challenge, we developed a novel approach, which ensures detection of a domain-specific ADA subtype regardless of its relative level in a polyclonal ADA sample by evaluating signal inhibition by a respective domain-containing molecule at the condition when signals from all other ADAs are fully blocked. The method has been used for characterization of ADA domain specificity in moxetumomab pasudotox clinical trials, including study 1053, the pivotal Phase III study in hairy cell leukemia patients. It allowed for successful detection of ADA-BD in the presence of immunodominant ADA-PE, enabling accurate determination of domain specificity for moxetumomab pasudotox. The results demonstrated that the method was superior than the conventional approach. The method could be applied broadly to other biologics with two or more domains when there is a need to detect a minor ADA subtype in polyclonal samples.
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Affiliation(s)
- Inna Vainshtein
- BioPharmaceuticals R&D, AstraZeneca, South San Francisco, CA 94080, USA.
| | - Bo Sun
- BioPharmaceuticals R&D, AstraZeneca, South San Francisco, CA 94080, USA
| | - Lorin K Roskos
- BioPharmaceuticals R&D, AstraZeneca, South San Francisco, CA 94080, USA
| | - Meina Liang
- BioPharmaceuticals R&D, AstraZeneca, South San Francisco, CA 94080, USA.
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8
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Balic K, Standifer N, Santiago L, Kuruvilla D, Yao NS, Kreitman RJ, Pastan I, Li X, Liang M, Vainshtein I, Tseng CM, Faggioni R, Roskos L. Pharmacokinetics (PK), pharmacodynamics (PD) and immunogenicity of moxetumomab pasudotox (Moxe), an immunotoxin targeting CD22, in adult patients (Pts) with relapsed or refractory hairy cell leukemia (HCL). J Clin Oncol 2018. [DOI: 10.1200/jco.2018.36.15_suppl.7061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | | | | | | | | | | | - Ira Pastan
- National Cancer Institute, National Institutes of Health, Bethesda, MD
| | - Xia Li
- MedImmune, Gaithersburg, MD
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9
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Riggs JM, Hanna RN, Rajan B, Zerrouki K, Karnell JL, Sagar D, Vainshtein I, Farmer E, Rosenthal K, Morehouse C, de Los Reyes M, Schifferli K, Liang M, Sanjuan MA, Sims GP, Kolbeck R. Characterisation of anifrolumab, a fully human anti-interferon receptor antagonist antibody for the treatment of systemic lupus erythematosus. Lupus Sci Med 2018; 5:e000261. [PMID: 29644082 PMCID: PMC5890856 DOI: 10.1136/lupus-2018-000261] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 03/02/2018] [Accepted: 03/08/2018] [Indexed: 01/19/2023]
Abstract
Objective We investigated the mechanistic and pharmacological properties of anifrolumab, a fully human, effector-null, anti-type I interferon (IFN) alpha receptor 1 (IFNAR1) monoclonal antibody in development for SLE. Methods IFNAR1 surface expression and internalisation on human monocytes before and after exposure to anifrolumab were assessed using confocal microscopy and flow cytometry. The effects of anifrolumab on type I IFN pathway activation were assessed using signal transducer and activator of transcription 1 (STAT1) phosphorylation, IFN-stimulated response element-luciferase reporter cell assays and type I IFN gene signature induction. The ability of anifrolumab to inhibit plasmacytoid dendritic cell (pDC) function and plasma cell differentiation was assessed by flow cytometry and ELISA. Effector-null properties of anifrolumab were assessed in antibody-dependent cell-mediated cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC) assays with B cells. Results Anifrolumab reduced cell surface IFNAR1 by eliciting IFNAR1 internalisation. Anifrolumab blocked type I IFN-dependent STAT1 phosphorylation and IFN-dependent signalling induced by recombinant and pDC-derived type I IFNs and serum of patients with SLE. Anifrolumab suppressed type I IFN production by blocking the type I IFN autoamplification loop and inhibited proinflammatory cytokine induction and the upregulation of costimulatory molecules on stimulated pDCs. Blockade of IFNAR1 suppressed plasma cell differentiation in pDC/B cell co-cultures. Anifrolumab did not exhibit CDC or ADCC activity. Conclusions Anifrolumab potently inhibits type I IFN-dependent signalling, including the type I IFN autoamplification loop, and is a promising therapeutic for patients with SLE and other diseases that exhibit chronic dysfunctional type I IFN signalling.
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Affiliation(s)
- Jeffrey M Riggs
- Respiratory, Inflammation and Autoimmunity, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Richard N Hanna
- Respiratory, Inflammation and Autoimmunity, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Bhargavi Rajan
- Clinical Pharmacology and DMPK, MedImmune LLC, Mountain View, California, USA
| | - Kamelia Zerrouki
- Respiratory, Inflammation and Autoimmunity, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Jodi L Karnell
- Respiratory, Inflammation and Autoimmunity, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Divya Sagar
- Respiratory, Inflammation and Autoimmunity, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Inna Vainshtein
- Clinical Pharmacology and DMPK, MedImmune LLC, Mountain View, California, USA
| | - Erika Farmer
- Analytical Sciences, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Kimberly Rosenthal
- Antibody Discovery and Protein Engineering, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Chris Morehouse
- Translational Medicine, MedImmune LLC, Gaithersburg, Maryland, USA
| | | | - Kevin Schifferli
- Respiratory, Inflammation and Autoimmunity, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Meina Liang
- Clinical Pharmacology and DMPK, MedImmune LLC, Mountain View, California, USA
| | - Miguel A Sanjuan
- Respiratory, Inflammation and Autoimmunity, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Gary P Sims
- Respiratory, Inflammation and Autoimmunity, MedImmune LLC, Gaithersburg, Maryland, USA
| | - Roland Kolbeck
- Respiratory, Inflammation and Autoimmunity, MedImmune LLC, Gaithersburg, Maryland, USA
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10
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Hemken PM, Jeanblanc NM, Rae T, Brophy SE, Datwyler MJ, Xu Y, Manetz TS, Vainshtein I, Liang M, Xiao X, Chowdhury PS, Chang CY, Streicher K, Greenlees L, Ranade K, Davis GJ. Development and analytical performance of a new ARCHITECT automated dipeptidyl peptidase-4 immunoassay. Pract Lab Med 2017; 9:58-68. [PMID: 29159257 PMCID: PMC5683673 DOI: 10.1016/j.plabm.2017.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 10/10/2017] [Accepted: 10/18/2017] [Indexed: 12/18/2022] Open
Abstract
Background Dipeptidyl peptidase-4 (DPP-4) may be a suitable biomarker to identify people with severe asthma who have greater activation of the interleukin-13 (IL-13) pathway and may therefore benefit from IL-13-targeted treatments. We report the analytical performance of an Investigational Use Only immunoassay and provide data on the biological range of DPP-4 concentrations. Methods We assessed assay performance, utilising analyses of precision, linearity and sensitivity; interference from common endogenous assay interferents, and from asthma and anti-diabetic medications, were also assessed. The assay was used to measure the range of serum DPP-4 concentrations in healthy volunteers and subjects with diabetes and severe, uncontrolled asthma. Results The total precision of DPP-4 concentration measurement (determined using percentage coefficient of variation) was ≤5% over 20 days. Dilution analysis yielded linear results from 30 to 1305 ng/mL; the limit of quantitation was 19.2 ng/mL. No notable endogenous or drug interferences were observed at the expected therapeutic concentration. Median DPP-4 concentrations in healthy volunteers and subjects with asthma or Type 1 diabetes were assessed, with concentrations remaining similar in subjects with diabetes and asthma across different demographics. Conclusion These analyses indicate that the ARCHITECT DPP-4 Immunoassay is a reliable and robust method for measuring serum DPP-4 concentration.
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Key Words
- Asthma
- Automated immunoassay
- BGG, bovine gamma globulin
- BMI, body mass index
- Biomarker
- CI, confidence interval
- CLSI, Clinical Laboratory Standards Institute
- CV, coefficient of variation
- DPP-4, dipeptidyl peptidase-4
- Dipeptidyl peptidase-4
- HAMA, human anti-mouse antibodies
- IL-13
- IL-13, interleukin-13
- IUO, Investigational Use Only
- Ig, immunoglobulin
- LoB, Limit of Blank
- LoD, Limit of Detection
- LoQ, Limit of Quantitation
- PI, prediction interval
- RF, rheumatoid factor
- RLU, relative light units
- SRT, serum tube-red top
- SST, serum separator tube
- Th2, T-helper-2
- mAb, monoclonal antibody
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Affiliation(s)
- Philip M Hemken
- Diagnostics Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064, USA
| | - Nicolette M Jeanblanc
- Diagnostics Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064, USA
| | - Tracey Rae
- Diagnostics Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064, USA
| | - Susan E Brophy
- Diagnostics Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064, USA
| | - Maria J Datwyler
- Diagnostics Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064, USA
| | - Ying Xu
- Diagnostics Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064, USA
| | - T Scott Manetz
- Translational Sciences, MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Inna Vainshtein
- Clinical Pharmacology and DMPK, MedImmune, 319 N Bernardo Ave, Mountain View, CA 94043, USA
| | - Meina Liang
- Clinical Pharmacology and DMPK, MedImmune, 319 N Bernardo Ave, Mountain View, CA 94043, USA
| | - Xiaodong Xiao
- Antibody Discovery and Protein Engineering, MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Partha S Chowdhury
- Antibody Discovery and Protein Engineering, MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Chien-Ying Chang
- Antibody Discovery and Protein Engineering, MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Katie Streicher
- Translational Medicine, MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Lydia Greenlees
- Translational Medicine, MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Koustubh Ranade
- Translational Medicine, MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Gerard J Davis
- Diagnostics Division, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064, USA
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11
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Douthwaite J, Moisan J, Privezentzev C, Soskic B, Sabbah S, Cohen S, Collinson A, England E, Huntington C, Kemp B, Zhuang L, Hudak S, Rees DG, Goldberg D, Barton C, Chang L, Vainshtein I, Liang M, Iciek L, Ambery P, Peakman M, Vaughan TJ, Tree TIM, Sansom DM, Bowen MA, Minter RR, Jermutus L. Correction: A CD80-Biased CTLA4-Ig Fusion Protein with Superior In Vivo Efficacy by Simultaneous Engineering of Affinity, Selectivity, Stability, and FcRn Binding. J I 2017; 199:1943. [DOI: 10.4049/jimmunol.1790013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Douthwaite J, Moisan J, Privezentzev C, Soskic B, Sabbah S, Cohen S, Collinson A, England E, Huntington C, Kemp B, Zhuang L, Hudak S, Rees DG, Goldberg D, Barton C, Chang L, Vainshtein I, Liang M, Iciek L, Ambery P, Peakman M, Vaughan TJ, Tree TIM, Sansom DM, Bowen MA, Minter RR, Jermutus L. A CD80-Biased CTLA4-Ig Fusion Protein with Superior In Vivo Efficacy by Simultaneous Engineering of Affinity, Selectivity, Stability, and FcRn Binding. J Immunol 2017; 198:528-537. [PMID: 27881707 DOI: 10.4049/jimmunol.1600682] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 10/13/2016] [Indexed: 12/16/2022]
Abstract
Affinity- and stability-engineered variants of CTLA4-Ig fusion molecules with enhanced pharmacokinetic profiles could yield improved therapies with the potential of higher efficacy and greater convenience to patients. In this study, to our knowledge, we have, for the first time, used in vitro evolution to simultaneously optimize CTLA4 affinity and stability. We selected for improved binding to both ligands, CD80 and CD86, and screened as dimeric Fc fusions directly in functional assays to identify variants with stronger suppression of in vitro T cell activation. The majority of CTLA4 molecules showing the largest potency gains in primary in vitro and ex vivo human cell assays, using PBMCs from type 1 diabetes patients, had significant improvements in CD80, but only modest gains in CD86 binding. We furthermore observed different potency rankings between our lead molecule MEDI5265, abatacept, and belatacept, depending on which type of APC was used, with MEDI5265 consistently being the most potent. We then created fusions of both stability- and potency-optimized CTLA4 moieties with human Fc variants conferring extended plasma t1/2 In a cynomolgus model of T cell-dependent Ab response, the CTLA4-Ig variant MEDI5265 could be formulated at >100 mg/ml for s.c. administration and showed superior efficacy and significantly prolonged serum t1/2 The combination of higher stability and potency with prolonged pharmacokinetics could be compatible with very infrequent, s.c. dosing while maintaining a similar level of immune suppression to more frequently and i.v. administered licensed therapies.
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Affiliation(s)
| | | | | | - Blagoje Soskic
- Royal Free Campus, Institute of Immunity and Transplantation, University College London, London NW3 2PF, United Kingdom
| | - Shereen Sabbah
- Department of Immunobiology, King's College London, London SE1 9RT, United Kingdom
- Faculty of Life Sciences and Medicine, King's College London, London SE1 9RT, United Kingdom
- National Institutes of Health Research Biomedical Research Centre at Guy's and St. Thomas' National Health Service Foundation Trust, London SE1 9RT, United Kingdom; and
| | | | | | | | | | - Ben Kemp
- MedImmune, Cambridge CB21 6GH, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | - Mark Peakman
- Department of Immunobiology, King's College London, London SE1 9RT, United Kingdom
- Faculty of Life Sciences and Medicine, King's College London, London SE1 9RT, United Kingdom
- National Institutes of Health Research Biomedical Research Centre at Guy's and St. Thomas' National Health Service Foundation Trust, London SE1 9RT, United Kingdom; and
| | | | - Tim I M Tree
- Department of Immunobiology, King's College London, London SE1 9RT, United Kingdom
- Faculty of Life Sciences and Medicine, King's College London, London SE1 9RT, United Kingdom
- National Institutes of Health Research Biomedical Research Centre at Guy's and St. Thomas' National Health Service Foundation Trust, London SE1 9RT, United Kingdom; and
| | - David M Sansom
- Royal Free Campus, Institute of Immunity and Transplantation, University College London, London NW3 2PF, United Kingdom
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13
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Jeanblanc N, Hemken P, Rae T, Brophy S, Manetz S, Vainshtein I, Liang M, Choudhury P, Chang C, Streicher K, Greenlees L, Xiao X, Ranade K, Davis G. P114 Research use only (RUO) DPP-4 immunoassay. Ann Allergy Asthma Immunol 2016. [DOI: 10.1016/j.anai.2016.09.124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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14
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Schneider AK, Vainshtein I, Roskos LK, Chavez C, Sun B, Liang M. An immunoinhibition approach to overcome the impact of pre-existing antibodies on cut point establishment for immunogenicity assessment of moxetumomab pasudotox. J Immunol Methods 2016; 435:68-76. [PMID: 27220271 DOI: 10.1016/j.jim.2016.05.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Revised: 05/13/2016] [Accepted: 05/16/2016] [Indexed: 01/01/2023]
Abstract
Immunogenicity can impact PK, PD, efficacy and safety of biopharmaceuticals, and is often evaluated as a secondary objective in clinical studies. Methods to detect anti-drug antibodies (ADA) and neutralizing ADA (NAb) are semi-quantitative and utilize cut points to determine positive or negative samples. Assay cut points are established by the statistical analysis of treatment-naïve subject specimens that are assumed ADA and NAb-negative. Pre-existing antibodies to various biopharmaceuticals have been observed in treatment-naïve subjects and may artificially elevate the cut point, resulting in compromised assay sensitivities, inaccuracy in immunogenicity reporting and ultimately misleading assessment of the impact of immunogenicity on clinical outcomes. Although several approaches such as removal of pre-existing antibody samples or increasing the sample dilution could be used for cut point establishment to mitigate impact of pre-existing antibodies, they each have limitations, especially when a high prevalence of pre-existing antibodies is observed. Here we describe an innovative approach used to establish cut points for ADA and NAb assays of moxetumomab pasudotox (moxetumomab), a recombinant anti-CD22 immunotoxin, to which a high prevalence of pre-existing antibodies was observed. In order to overcome the challenges associated with this high prevalence and prevent establishment of an artificially elevated cut point, we developed an immunoinhibition approach that allowed generation of pseudo ADA and NAb-negative populations for cut point determination. Immunoinhibition was performed by adding excess moxetumomab (for ADA) or a non-CD22 binding PE38-containing immunotoxin, CAT-5001 (for NAb), to treatment-naive samples prior to evaluating samples for cut point establishment. This approach successfully eliminated pre-existing antibody activity in treatment-naive samples, enabling establishment of more accurate ADA and NAb assay cut points. A comparative analysis of the clinical immunogenicity results using cut points derived with immunoinhibition and without immunoinhibition (conventional method) demonstrated that the immunoinhibition approach markedly improved detection sensitivity and accuracy of immunogenicity characterization in patient samples. This innovative approach provides an alternative, practical solution for immunogenicity assay cut point establishment when biopharmaceuticals have a high prevalence of pre-existing antibodies.
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Affiliation(s)
- Amy K Schneider
- Clinical Pharmacology & DMPK, Medimmune, LLC, 319 North Bernardo Avenue, Mountain View, CA 94043, USA
| | - Inna Vainshtein
- Clinical Pharmacology & DMPK, Medimmune, LLC, 319 North Bernardo Avenue, Mountain View, CA 94043, USA.
| | - Lorin K Roskos
- Clinical Pharmacology & DMPK, Medimmune, LLC, 319 North Bernardo Avenue, Mountain View, CA 94043, USA
| | - Carlos Chavez
- Clinical Pharmacology & DMPK, Medimmune, LLC, 319 North Bernardo Avenue, Mountain View, CA 94043, USA
| | - Bo Sun
- Clinical Pharmacology & DMPK, Medimmune, LLC, 319 North Bernardo Avenue, Mountain View, CA 94043, USA
| | - Meina Liang
- Clinical Pharmacology & DMPK, Medimmune, LLC, 319 North Bernardo Avenue, Mountain View, CA 94043, USA.
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15
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Schwickart M, Chavez C, Henderson S, Vainshtein I, Standifer N, DelNagro C, Mehrzai F, Schneider A, Roskos L, Liang M. Evaluation of assay interference and interpretation of CXCR4 receptor occupancy results in a preclinical study with MEDI3185, a fully human antibody to CXCR4. Cytometry B Clin Cytom 2015; 90:209-19. [PMID: 26384735 PMCID: PMC5064743 DOI: 10.1002/cyto.b.21327] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 08/05/2015] [Accepted: 09/10/2015] [Indexed: 12/02/2022]
Abstract
Background Receptor occupancy (RO) assays provide a means to measure the direct interaction of therapeutics with their cell surface targets. Free receptor assays quantify cell‐surface receptors not bound by a therapeutic while total receptor assays quantify the amount of target on the cell surface. Methods We developed both a flow cytometry‐based free RO assay to detect free surface CXCR4, and a total surface CXCR4 assay. In an effort to evaluate potential displacement interference, we performed in vitro experiments to compare on‐cell affinity with the IC50 values from in vitro and in vivo from the free CXCR4 assay. We determined free and total surface CXCR4 on circulating blood cells in cynomolgus monkeys dosed with MEDI3185, a fully human monoclonal antibody to CXCR4. Results We devised an approach to evaluate displacement interference during assay development and showed that our free assay demonstrated little to no displacement interference. After dosing cynomolgus monkeys with MEDI3185, we observed dose‐dependence in the magnitude and duration of receptor occupancy and found CXCR4 to increase on lymphocytes, monocytes, and granulocytes. In a multiple dose study, we observed time points where surface CXCR4 appeared fully occupied but MEDI3185 was not detectable in serum. These paradoxical results represented a type of assay interference, and by comparing pharmacokinetic, ADA and total CXCR4 results, the most likely reason for the free CXCR4 results was the emergence of neutralizing anti‐drug antibodies (ADA). The total CXCR4 assay was unaffected by ADA and provided a reliable marker of target modulation in both in vivo studies. © 2015 The Authors Cytometry Part B: Clinical Cytometry Published byWiley Periodicals, Inc.
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Affiliation(s)
- Martin Schwickart
- Clinical Pharmacology & DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Carlos Chavez
- Clinical Pharmacology & DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Simon Henderson
- Clinical Pharmacology & DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Inna Vainshtein
- Clinical Pharmacology & DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Nathan Standifer
- Clinical Pharmacology & DMPK, Medimmune, LLC, Mountain View, California, 94043
| | | | - Freshta Mehrzai
- Clinical Pharmacology & DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Amy Schneider
- Clinical Pharmacology & DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Lorin Roskos
- Clinical Pharmacology & DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Meina Liang
- Clinical Pharmacology & DMPK, Medimmune, LLC, Mountain View, California, 94043
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16
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Vainshtein I, Schneider AK, Sun B, Schwickart M, Roskos LK, Liang M. Multiplexing of receptor occupancy measurements for pharmacodynamic biomarker assessment of biopharmaceuticals. Cytometry B Clin Cytom 2015; 90:128-40. [PMID: 26332491 PMCID: PMC5057311 DOI: 10.1002/cyto.b.21319] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 07/24/2015] [Accepted: 08/26/2015] [Indexed: 12/15/2022]
Abstract
Background Receptor occupancy (RO) assays measure drug target engagement, and are used as pharmacodynamic (PD) biomarkers. RO assays are commonly performed by flow cytometry and often require multiplexing for assessment of multiple PD biomarkers when specimen volumes are limited. We present multiplexed RO assays for an IGF1R‐EGFR bispecific antibody (Bs‐Ab) and a CTLA4‐Ig recombinant fusion protein to demonstrate key considerations for accurate RO assessment. Methods RO in cynomolgus monkeys was determined in whole blood using flow cytometry. Free and total receptors were measured using anti‐receptor fluorescence‐labeled detection reagents, competitive and noncompetitive to drug, respectively. Results RO of IGF1R was examined as PD for Bs‐Ab, since IGF1R was expressed on blood cells. Multiplexed measurements of free and total IGF1R showed that IGF1R expression measured by total receptor was highly variable, impacting interpretation of free‐IGF1R. Normalization of free‐over‐total IGF1R measurements compensated for variability of receptor expression allowing for accurate RO assessment. RO of CTLA4‐Ig, a recombinant fusion protein targeting CD80 and CD86 receptors, was multiplexed to simultaneously measure target engagements for both receptors. Both RO methods demonstrated specificity of receptor measurements without cross‐reactivity to each other in multiplexed formats. RO methods were used for evaluation of PD activity of Bs‐Ab and CTLA4‐Ig in cynomolgus monkeys. In both cases, RO results showed dose‐dependent target engagement, corresponding well to the pharmacokinetics. Conclusions Multiplexed RO methods allowed accurate assessment of PD activity for Bs‐Ab and CTLA4‐Ig, facilitating development of these biopharmaceuticals from preclinical to clinical stages. © 2015 The Authors Cytometry Part B: Clinical Cytometry Published by Wiley Periodicals, Inc.
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Affiliation(s)
- Inna Vainshtein
- Clinical Pharmacology & DMPK, Medimmune LLC, Mountain View, California, 94043
| | - Amy K Schneider
- Clinical Pharmacology & DMPK, Medimmune LLC, Mountain View, California, 94043
| | - Bo Sun
- Clinical Pharmacology & DMPK, Medimmune LLC, Mountain View, California, 94043
| | - Martin Schwickart
- Clinical Pharmacology & DMPK, Medimmune LLC, Mountain View, California, 94043
| | - Lorin K Roskos
- Clinical Pharmacology & DMPK, Medimmune LLC, Mountain View, California, 94043
| | - Meina Liang
- Clinical Pharmacology & DMPK, Medimmune LLC, Mountain View, California, 94043
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17
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Liang M, Schwickart M, Schneider AK, Vainshtein I, Del Nagro C, Standifer N, Roskos LK. Receptor occupancy assessment by flow cytometry as a pharmacodynamic biomarker in biopharmaceutical development. Cytometry B Clin Cytom 2015; 90:117-27. [PMID: 26054054 PMCID: PMC5042057 DOI: 10.1002/cyto.b.21259] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 04/20/2015] [Accepted: 05/28/2015] [Indexed: 12/19/2022]
Abstract
Receptor occupancy (RO) assays are designed to quantify the binding of therapeutics to their targets on the cell surface and are frequently used to generate pharmacodynamic (PD) biomarker data in nonclinical and clinical studies of biopharmaceuticals. When combined with the pharmacokinetic (PK) profile, RO data can establish PKPD relationships, which are crucial for informing dose decisions. RO is commonly measured by flow cytometry on fresh blood specimens and is subject to numerous technical and logistical challenges. To ensure that reliable and high quality results are generated from RO assays, careful assay design, key reagent characterization, data normalization/reporting, and thorough planning for implementation are of critical importance during development. In this article, the authors share their experiences and perspectives in these areas and discuss challenges and potential solutions when developing and implementing a flow cytometry‐based RO method in support of biopharmaceutical drug development. © 2015 The Authors Cytometry Part B: Clinical Cytometry Published by Wiley Periodicals, Inc.
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Affiliation(s)
- Meina Liang
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Martin Schwickart
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Amy K Schneider
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Inna Vainshtein
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Christopher Del Nagro
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Nathan Standifer
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
| | - Lorin K Roskos
- Department of Clinical Pharmacology and DMPK, Medimmune, LLC, Mountain View, California, 94043
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Vainshtein I, Roskos LK, Cheng J, Sleeman MA, Wang B, Liang M. Quantitative measurement of the target-mediated internalization kinetics of biopharmaceuticals. Pharm Res 2015; 32:286-99. [PMID: 25208874 PMCID: PMC4284384 DOI: 10.1007/s11095-014-1462-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Accepted: 07/24/2014] [Indexed: 12/20/2022]
Abstract
PURPOSE Measurement of internalization of biopharmaceuticals targeting cell surface proteins can greatly facilitate drug development. The objective of this study was to develop a reliable method for determination of internalization rate constant (kint) and to demonstrate its utility. METHODS This method utilized confocal imaging to record the internalization kinetics of fluorescence-tagged biopharmaceuticals in live-cells and a quantitative image-analysis algorithm for kint determination. Kint was incorporated into a pharmacokinetic-pharmacodynamic (PK-PD) model for simulation of the drug PK profiles, target occupancy and the displacement of endogenous ligand. RESULTS The method was highly sensitive, allowing kint determination in cells expressing as low as 5,000 receptors/cell, and was amenable to adherent and suspension cells. Its feasibility in a mixed cell population, such as whole blood, was also demonstrated. Accurate assessment of the kint was largely attributed to continuous monitoring of internalization in live cells, rapid confocal image acquisition and quantitative image-analysis algorithm. Translational PK-PD simulations demonstrated that kint is a major determinant of the drug PK profiles, target occupancy, and the displacement of endogenous ligand. CONCLUSIONS The developed method is robust for broad cell types. Reliable kint assessment can greatly expedite biopharmaceutical development by facilitating target evaluation, drug affinity goal setting, and clinical dose projection.
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Affiliation(s)
- Inna Vainshtein
- Clinical Pharmacology & DMPK, MedImmune LLC, Hayward, CA USA
| | - Lorin K. Roskos
- Clinical Pharmacology & DMPK, MedImmune LLC, Hayward, CA USA
| | - Jackie Cheng
- Clinical Pharmacology & DMPK, MedImmune LLC, Hayward, CA USA
| | - Matthew A. Sleeman
- Respiratory, Inflammation and Autoimmunity, MedImmune Ltd, Cambridge, UK
| | - Bing Wang
- Clinical Pharmacology & DMPK, MedImmune LLC, Hayward, CA USA
| | - Meina Liang
- Clinical Pharmacology & DMPK, MedImmune LLC, Hayward, CA USA
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Minter RR, Cohen ES, Wang B, Liang M, Vainshtein I, Rees G, Eghobamien L, Harrison P, Sims DA, Matthews C, Wilkinson T, Monk P, Drinkwater C, Fabri L, Nash A, McCourt M, Jermutus L, Roskos L, Anderson IK, Sleeman MA. Protein engineering and preclinical development of a GM-CSF receptor antibody for the treatment of rheumatoid arthritis. Br J Pharmacol 2014; 168:200-11. [PMID: 22913645 DOI: 10.1111/j.1476-5381.2012.02173.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 05/22/2012] [Accepted: 07/16/2012] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE For antibody therapies against receptor targets, in vivo outcomes can be difficult to predict because of target-mediated clearance or antigen 'sink' effects. The purpose of this work was to engineer an antibody to the GM-CSF receptor α (GM-CSFRα) with pharmacological properties optimized for chronic, s.c. treatment of rheumatoid arthritis (RA) patients. EXPERIMENTAL APPROACH We used an in silico model of receptor occupancy to guide the target affinity and a combinatorial phage display approach for affinity maturation. Mechanism of action and internalization assays were performed on the optimized antibody in vitro before refining the modelling predictions of the eventual dosing in man. Finally, in vivo pharmacology studies in cynomolgus monkeys were carried out to inform the predictions and support future clinical development. KEY RESULTS Antibody potency was improved 8600-fold, and the target affinity was reached. The refined model predicted pharmacodynamic effects at doses as low as 1 mg kg(-1) and a study in cynomolgus monkeys confirmed in vivo efficacy at 1 mg kg(-1) dosing. CONCLUSIONS AND IMPLICATIONS This rational approach to antibody drug discovery enabled the isolation of a potent molecule compatible with chronic, s.c. self-administration by RA patients. We believe this general approach enables the development of optimal biopharmaceuticals.
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Wang B, Liang M, Yao Z, Vainshtein I, Lee R, Schneider A, Zusmanovich M, Jin F, O'Connor K, Donato-Weinstein B, Iciek L, Lavallee T, Roskos L. Pharmacokinetic and pharmacodynamic comparability study of moxetumomab pasudotox, an immunotoxin targeting CD22, in cynomolgus monkeys. J Pharm Sci 2012; 102:250-61. [PMID: 23090886 DOI: 10.1002/jps.23343] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 09/20/2012] [Accepted: 09/28/2012] [Indexed: 11/10/2022]
Abstract
Moxetumomab pasudotox is an immunotoxin currently being investigated in patients for the treatment of CD22-expressing B-cell malignancies. A single-cycle pharmacokinetic (PK)-pharmacodynamic (PD) study was conducted in cynomolgus monkeys for PK comparability assessment and population PK-PD modeling after major manufacturing process and site changes. Primates were randomized by body weight and baseline CD22 lymphocyte counts to receive intravenous administrations of 1 mg/kg moxetumomab pasudotox (n = 12/group) on Days 1, 3, and 5. PK and B-lymphocyte count data were modeled using a population approach. The 90% confidence intervals of the geometric mean ratios of PK exposure were within the 80%-125% range. The B lymphocytes were depleted to a similar extent, and the immunogenicity incidences were similar across the two groups. The B-cell depletion was described by a novel lifespan model in which moxetumomab pasudotox induced random destruction of B cells in each aging compartment. The endogenous de novo influx from bone marrow was subject to a negative feedback mechanism. The estimated B cell apparent lifespan was 51 days. Covariate analysis confirmed that the manufacturing change had no impact on PK or PD of moxetumomab pasudotox. Results from this study supported continued clinical investigation of moxetumomab pasudotox using the new material.
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Affiliation(s)
- Bing Wang
- Clinical Pharmacology & DMPK, MedImmune LLC, Hayward, California, USA.
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Wang B, Lau YY, Liang M, Vainshtein I, Zusmanovich M, Lu H, Magrini F, Sleeman M, Roskos L. Mechanistic modeling of antigen sink effect for mavrilimumab following intravenous administration in patients with rheumatoid arthritis. J Clin Pharmacol 2011; 52:1150-61. [PMID: 21947370 DOI: 10.1177/0091270011412964] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Mavrilimumab is a fully human monoclonal antibody that binds to granulocyte-macrophage colony stimulating factor receptor α (GM-CSFRα) with high affinity and specificity and has potential application in various inflammatory diseases. The objective of this investigation was to develop a mechanistic population model to characterize the pharmacokinetics of mavrilimumab, the GM-CSFRα-mediated clearance, and receptor occupancy following single intravenous dosing to patients with rheumatoid arthritis. The internalization rate of mavrilimumab-GM-CSFRα complex was fixed to a value determined from quantitative confocal fluorescent imaging. The estimated typical first-order clearance and the central and peripheral distribution volumes were 3.79 mL/kg/d, 39.6 mL/kg, and 50.3 mL/kg, respectively. The systemic GM-CSFRα expression level was estimated to be 0.0782 nM, and the equilibrium dissociation constant (0.103 nM) was in good agreement with the monovalent affinity determined by surface plasmon resonance. By fitting to the observed pharmacokinetic data, the mechanistic model predicted that systemically greater than 90% GM-CSFRα blockade by mavrilimumab was achieved and maintained up to 4, 7, and 11 weeks following single 1-, 3-, and 10-mg/kg administrations, respectively. Posterior visual predictive check and bootstrapping suggest that the mechanistic model is reasonably robust and can be used to predict mavrilimumab exposure under various scenarios for future clinical trial design.
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Cibotti R, Oganesyan V, Liang M, Vainshtein I, Morris C, Riggs J, Dall’Acqua W, Roskos L, Kiener P, Coyle A. 81 Mechanism of action of Sifnalimumab, a human IFN-α neutralizing monoclonal antibody. Cytokine 2008. [DOI: 10.1016/j.cyto.2008.07.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Vainshtein I, Silveria S, Kaul P, Rouhani R, Eglen RM, Wang J. A high-throughput, nonisotopic, competitive binding assay for kinases using nonselective inhibitor probes (ED-NSIP). ACTA ACUST UNITED AC 2003; 7:507-14. [PMID: 14599348 DOI: 10.1177/1087057102238624] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A novel competitive binding assay for protein kinase inhibitors has been developed for high-throughput screening (HTS). Unlike functional kinase assays, which are based on detection of substrate phosphorylation by the enzyme, this novel method directly measures the binding potency of compounds to the kinase ATP binding site through competition with a conjugated binding probe. The binding interaction is coupled to a signal amplification system based on complementation of beta-galactosidase enzyme fragments, a homogeneous, nonisotopic assay technology platform developed by DiscoveRx Corp. In the present study, staurosporine, a potent, nonselective kinase inhibitor, was chemically conjugated to a small fragment of beta-galactosidase (termed ED-SS). This was used as the binding probe to the kinase ATP binding pocket. The binding potencies of several inhibitors with diverse structures were assessed by displacement of ED-SS from the kinase. The assay format was specifically evaluated with GSK3alpha, an enzyme previously screened in a radioactive kinase assay (i.e., measurement of [(33)P]-gamma-ATP incorporation into the kinase peptide substrate). Under optimized assay conditions, nonconjugated staurosporine inhibited ED-SS binding in a concentration-dependent manner with an apparent potency (IC(50)) of 11 nM, which was similar to the IC(50) value determined in a radioactive assay. Furthermore, 9 kinase inhibitors with diverse structures, previously identified from chemical compound library screening, were screened using the competitive binding assay. The potencies in the binding assay were in very good agreement with those obtained previously in the isotopic functional activity assay. The binding assay was adapted for automated HTS using selected compound libraries in a 384-well microtiter plate format. The HTS assay was observed to be highly robust and reproducible (Z' factors > 0.7) with high interassay precision (R(2) > 0.96). Interference of compounds with the beta-galactosidase signal readout was negligible. In conclusion, the DiscoveRx competitive kinase binding assay, termed ED-NSIP trade mark, provides a novel method for screening kinase inhibitors. The format is homogeneous, robust, and amenable to automation. Because there is no requirement for substrate-specific antibodies, the assay is particularly applicable to Ser/Thr kinase assay, in which difficulties in identifying a suitable substrate and antibody preclude development of nonisotopic assays. Although the nonselective kinase inhibitor, staurosporine, was used here, chemically conjugating the ED fragment to other small molecule enzyme inhibitors is also feasible, suggesting that the format is generally applicable to other enzyme systems.
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Zhao X, Vainshtein I, Gellibolian R, Shu Y, Dotimas H, Wang XM, Fung P, Horecka J, Bosano BL, Eglen RM. Homogeneous Assays for Cellular Protein Degradation Usingβ-Galactosidase Complementation: NF-κB/IκB Pathway Signaling. Assay Drug Dev Technol 2003; 1:823-33. [PMID: 15090228 DOI: 10.1089/154065803772613453] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Activation of cells by the tumor necrosis factor-alpha (TNF-alpha) and interleukin-1 (IL-1) cytokines results in activation of the nuclear factor-kappaB (NF-kappaB) via proteasomal degradation of an associated IkappaB molecule. To monitor cellular IkappaB, the protein was recombinantly expressed as a fusion protein with a novel enzymatic tag, ProLabel (PL). ProLabel is a small 5.5-kDa sequence from the amino-terminal amino acids of beta-galactosidase, possesses a simple ribbon structure, and can be fused to many proteins via the amino or carboxyl terminus. Expression of this construct allows quantitative detection of the recombinant protein in crude lysates by using a method based on beta-galactosidase enzyme fragment complementation (EFC). Transient transfection of IkappaB-PL in HeLa cells generated an EFC signal that was highly correlated with a western analysis of the protein construct. ProLabel expressed alone in the cells did not show any EFC activity, due to rapid proteolytic degradation, indicating a very low background signal from the protein tag. TNF-alpha and IL-1 treatment induced a concentration-dependent degradation of IkappaB-PL, with potency values similar to those reported using other methods. IkappaBM-PL (mutant of IkappaB-PL), in contrast, did not undergo degradation for concentrations up to and including 10 ng/ml TNF-alpha or IL-1, demonstrating that degradation of IkappaB-PL was specific to the NF-kappaB pathway activation. TNF-alpha and IL-1 induced maximal IkappaB-PL degradation within 30 min of induction. This was reversed by several agents that ablate this pathway, including anti-TNF-alpha antibodies and the proteasome inhibitor, MG-132. The assay was amenable to HTS systems, with good precision and reproducibility. Z' values and coefficients of variance for IkappaB-PL degradation were 0.6 and <9%, respectively.
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Abstract
The pleckstrin homology (PH) domain of the insulin receptor substrate-1 (IRS-1) plays a role in directing this molecule to the insulin receptor, thereby regulating its tyrosine phosphorylation. In this work, the role of the PH domain in subsequent signaling was studied by constructing constitutively active forms of IRS-1 in which the inter-SH2 domain of the p85 subunit of phosphatidylinositol 3-kinase was fused to portions of the IRS-1 molecule. Chimeric molecules containing the PH domain were found to activate the downstream response of stimulating the Ser/Thr kinase Akt. A chimera containing point mutations in the PH domain that abolished the ability of this domain to bind phosphatidylinositol 4,5-bisphosphate prevented these molecules from activating Akt. These mutations also decreased by about 70% the amount of the constructs present in a particulate fraction of the cells. These results indicate that the PH domain of IRS-1, in addition to directing this protein to the receptor for tyrosine phosphorylation, functions in the ability of this molecule to stimulate subsequent responses. Thus, compromising the function of the PH domain, e.g. in insulin-resistant states, could decrease both the ability of IRS-1 to be tyrosine phosphorylated by the insulin receptor and to link to subsequent downstream targets.
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Affiliation(s)
- I Vainshtein
- Department of Molecular Pharmacology, Stanford University School of Medicine, Stanford, California 94305-5174, USA
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Vainshtein I, Atrazhev A, Eom SH, Elliott JF, Wishart DS, Malcolm BA. Peptide rescue of an N-terminal truncation of the Stoffel fragment of taq DNA polymerase. Protein Sci 1996; 5:1785-92. [PMID: 8880902 PMCID: PMC2143541 DOI: 10.1002/pro.5560050904] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Deletion of the first 289 amino acids of the DNA polymerase from Thermus aquaticus (Taq polymerase) removes the 5' to 3' exonuclease domain to yield the thermostable Stoffel polymerase fragment (Lawyer et al., 1989). Preliminary N-terminal truncation studies of the Stoffel fragment suggested that removal of an additional 12 amino acids (the Stof delta 12 mutant) had no significant effect on activity or stability, but that the further truncation of the protein (the Stof delta 47, in which 47 amino acids were deleted), resulted in a significant loss of both activity and thermostability. A 33-amino acid synthetic peptide, based on this critical region (i.e., residues 303-335 inclusive), was able to restore 85% of the Stof delta 12 activity when added back to the truncated Stof delta 47 protein as well as return the temperature optimum to that of the Stof delta 12 and Stoffel proteins. Examination of the crystal structure of Taq polymerase (Kim et al., 1995) shows that residues 302-336 of the enzyme form a three-stranded beta-sheet structure that interacts with the remainder of the protein. CD analysis of the 33-amino acid peptide indicates that the free peptide also adopts an ordered structure in solution with more than 50% beta-sheet content. These data suggest that this 33-amino acid peptide constitutes a stable beta-sheet structure capable of rescuing the truncated polymerase in a fashion analogous to the well-documented complementation of Ribonuclease S protein by the 15-residue, alpha-helical, S peptide.
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Affiliation(s)
- I Vainshtein
- Protein Engineering Network of Centers of Excellence, University of Alberta, Edmonton, Canada
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Affiliation(s)
- J Kriangkum
- Department of Medical Microbiology and Infectious Diseases, University of Alberta, Edmonton, Canada
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