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Rhode H, Muckova P, Büchler R, Wendler S, Tautkus B, Vogel M, Moore T, Grosskreutz J, Klemm A, Nabity M. A next generation setup for pre-fractionation of non-denatured proteins reveals diverse albumin proteoforms each carrying several post-translational modifications. Sci Rep 2019; 9:11733. [PMID: 31409882 PMCID: PMC6692309 DOI: 10.1038/s41598-019-48278-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 07/29/2019] [Indexed: 02/07/2023] Open
Abstract
Proteomic biomarker search requires the greatest analytical reproducibility and detailed information on altered proteoforms. Our protein pre-fractionation applies orthogonal native chromatography and conserves important features of protein variants such as native molecular weight, charge and major glycans. Moreover, we maximized reproducibility of sample pre-fractionation and preparation before mass spectrometry by parallelization and automation. In blood plasma and cerebrospinal fluid (CSF), most proteins, including candidate biomarkers, distribute into a multitude of chromatographic clusters. Plasma albumin, for example, divides into 15-17 clusters. As an example of our technique, we analyzed these albumin clusters from healthy volunteers and from dogs and identified cluster-typical modification patterns. Renal disease further modifies these patterns. In human CSF, we found only a subset of proteoforms with fewer modifications than in plasma. We infer from this example that our method can be used to identify and characterize distinct proteoforms and, optionally, enrich them, thereby yielding the characteristics of proteoform-selective biomarkers.
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Affiliation(s)
- Heidrun Rhode
- Institute of Biochemistry I, Nonnenplan 2-4, University Hospital Jena, 07740, Jena, Germany.
| | - Petra Muckova
- Institute of Biochemistry I, Nonnenplan 2-4, University Hospital Jena, 07740, Jena, Germany
| | - Rita Büchler
- Institute of Biochemistry I, Nonnenplan 2-4, University Hospital Jena, 07740, Jena, Germany.,Pharmachem Straße 1, Pharmachem Pößneck GmbH & Co. KG, 07381, Pößneck, Germany
| | - Sindy Wendler
- Institute of Biochemistry I, Nonnenplan 2-4, University Hospital Jena, 07740, Jena, Germany.,Institute of Microbiology, Am Klinikum 1, University Hospital Jena, 07747, Jena, Germany
| | - Bärbel Tautkus
- Institute of Biochemistry I, Nonnenplan 2-4, University Hospital Jena, 07740, Jena, Germany
| | - Michaela Vogel
- Institute of Biochemistry I, Nonnenplan 2-4, University Hospital Jena, 07740, Jena, Germany
| | - Thomas Moore
- Analytik Jena, Konrad-Zuse-Str.1, 07745, Jena, Germany
| | - Julian Grosskreutz
- Department of Neurology, Am Klinikum 1, University Hospital Jena, 07747, Jena, Germany
| | - Andree Klemm
- KfH Kuratorium für Dialyse und Nierentransplantation e.V., Ernst-Ruska-Ring 19, 07745, Jena, Germany
| | - Mary Nabity
- Department of Veterinary Pathobiology, College of Veterinary Medicine, 4467 TAMU, Texas A&M University, College Station, TX, 77843-4467, Texas, USA
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Himalayan cheese (Kalari/Kradi) fermented with different probiotic strains: In vitro investigation of nutraceutical properties. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2019.01.024] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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3
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Song JG, Lee SH, Han HK. The stabilization of biopharmaceuticals: current understanding and future perspectives. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2017. [DOI: 10.1007/s40005-017-0341-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Tamizi E, Jouyban A. Forced degradation studies of biopharmaceuticals: Selection of stress conditions. Eur J Pharm Biopharm 2015; 98:26-46. [PMID: 26542454 DOI: 10.1016/j.ejpb.2015.10.016] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 10/21/2015] [Accepted: 10/28/2015] [Indexed: 12/24/2022]
Abstract
Stability studies under stress conditions or forced degradation studies play an important role in different phases of development and production of biopharmaceuticals and biological products. These studies are mostly applicable to selection of suitable candidates and formulation developments, comparability studies, elucidation of possible degradation pathways and identification of degradation products, as well as, development of stability indicating methods. Despite the integral part of these studies in biopharmaceutical industry, there is no well-established protocol for the selection of stress conditions, timing of stress testing and required extent of degradation. Therefore, due to the present gap in the stability studies guidelines, it is the responsibility of researchers working in academia and biopharmaceutical industry to set up forced degradation experiments that could fulfill all the expectations from the stability studies of biopharmaceuticals under stress conditions. Concerning the importance of the function of desired stress conditions in forced degradation studies, the present review aims to provide a practical summary of the applicable stress conditions in forced degradation studies of biopharmaceuticals according to the papers published in a time period of 1992-2015 giving detailed information about the experimental conditions utilized to induce required stresses.
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Affiliation(s)
- Elnaz Tamizi
- Drug Applied Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Abolghasem Jouyban
- Pharmaceutical Analysis Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
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Yazdani Y, Mohammadi S, Yousefi M, Shokri F. Preliminary Assessment of Various Additives on the Specific Reactivity of Anti- rHBsAg Monoclonal Antibodies. Avicenna J Med Biotechnol 2015; 7:145-50. [PMID: 26605008 PMCID: PMC4629456 DOI: pmid/26605008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Antibodies have a wide application in diagnosis and treatment. In order to maintain optimal stability of various functional parts of antibodies such as antigen binding sites, several approaches have been suggested. Using additives such as polysaccharides and polyols is one of the main methods in protecting antibodies against aggregation or degradation in the formulation. The aim of this study was to evaluate the protective effect of various additives on the specific reactivity of monoclonal antibodies (mAbs) against recombinant HBsAg (rHBsAg) epitopes. METHODS To estimate the protective effect of different additives on the stability of antibody against conformational epitopes (S3 antibody) and linear epitopes (S7 and S11 antibodies) of rHBsAg, heat shock at 37°C was performed in liquid and solid phases. Environmental factors were considered to be constant. The specific reactivity of antibodies was evaluated using ELISA method. The data were analyzed using SPSS software by Mann-Whitney nonparametric test with the confidence interval of 95%. RESULTS Our results showed that 0.25 M sucrose, 0.04 M trehalose and 0.5% BSA had the most protective effect on maintaining the reactivity of mAbs (S3) against conformational epitopes of rHBsAg. Results obtained from S7 and S11 mAbs against linear characteristics showed minor differences. The most efficient protective additives were 0.04 M trehalose and 1 M sucrose. CONCLUSION Nowadays, application of appropriate additives is important for increasing the stability of antibodies. It was concluded that sucrose, trehalose and BSA have considerable effects on the specific reactivity of anti rHBsAg mAbs during long storage.
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Affiliation(s)
- Yaghoub Yazdani
- Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran
- Department of Molecular Medicine, Faculty of Advanced Medical Technologies, Golestan University of Medical Sciences, Gorgan, Iran
- Corresponding author: Yaghoub Yazdani, Ph.D., Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran, Tel: +98 17 32430563, E-mail:
| | - Saeed Mohammadi
- Department of Molecular Medicine, Faculty of Advanced Medical Technologies, Golestan University of Medical Sciences, Gorgan, Iran
| | - Mehdi Yousefi
- Department of Immunology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Fazel Shokri
- Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
- Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran
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6
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Teekamp N, Duque LF, Frijlink HW, Hinrichs WLJ, Olinga P. Production methods and stabilization strategies for polymer-based nanoparticles and microparticles for parenteral delivery of peptides and proteins. Expert Opin Drug Deliv 2015; 12:1311-31. [DOI: 10.1517/17425247.2015.1003807] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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7
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Li W, Kerwin JL, Schiel J, Formolo T, Davis D, Mahan A, Benchaar SA. Structural Elucidation of Post-Translational Modifications in Monoclonal Antibodies. ACS SYMPOSIUM SERIES 2015. [DOI: 10.1021/bk-2015-1201.ch003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Wenzhou Li
- Amgen Inc., Thousand Oaks, California 91320, United States
- Sanovas Inc., Sausalito, California 94965, United States
- Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Janssen Research and Development, LLC, Spring House, Pennsylvania 19477, United States
| | - James L. Kerwin
- Amgen Inc., Thousand Oaks, California 91320, United States
- Sanovas Inc., Sausalito, California 94965, United States
- Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Janssen Research and Development, LLC, Spring House, Pennsylvania 19477, United States
| | - John Schiel
- Amgen Inc., Thousand Oaks, California 91320, United States
- Sanovas Inc., Sausalito, California 94965, United States
- Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Janssen Research and Development, LLC, Spring House, Pennsylvania 19477, United States
| | - Trina Formolo
- Amgen Inc., Thousand Oaks, California 91320, United States
- Sanovas Inc., Sausalito, California 94965, United States
- Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Janssen Research and Development, LLC, Spring House, Pennsylvania 19477, United States
| | - Darryl Davis
- Amgen Inc., Thousand Oaks, California 91320, United States
- Sanovas Inc., Sausalito, California 94965, United States
- Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Janssen Research and Development, LLC, Spring House, Pennsylvania 19477, United States
| | - Andrew Mahan
- Amgen Inc., Thousand Oaks, California 91320, United States
- Sanovas Inc., Sausalito, California 94965, United States
- Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Janssen Research and Development, LLC, Spring House, Pennsylvania 19477, United States
| | - Sabrina A. Benchaar
- Amgen Inc., Thousand Oaks, California 91320, United States
- Sanovas Inc., Sausalito, California 94965, United States
- Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Janssen Research and Development, LLC, Spring House, Pennsylvania 19477, United States
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8
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Espinosa-de la Garza CE, Perdomo-Abúndez FC, Padilla-Calderón J, Uribe-Wiechers JM, Pérez NO, Flores-Ortiz LF, Medina-Rivero E. Analysis of recombinant monoclonal antibodies by capillary zone electrophoresis. Electrophoresis 2013; 34:1133-40. [PMID: 23417502 DOI: 10.1002/elps.201200575] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Revised: 12/07/2012] [Accepted: 12/18/2012] [Indexed: 02/03/2023]
Abstract
Analytical platforms that characterize charge heterogeneity in therapeutic proteins, such as mAbs, are important tools that can be used to define quality attributes. CZE separates protein moieties close to their native state and is a valuable physicochemical analytical method that can be used in parallel with other orthogonal methods for characterization and comparability. In this study, custom conditions for the analysis of charge heterogeneity of two mAbs were developed with regard to critical parameters in the BGE, running conditions, and sample treatment. The method application was tested for up to four mAbs and one mAb fragment. The electropherograms showed specific profiles and contrasting levels of basic and acidic isoforms with respect to the main isoform. Issues that surround this method, such as peak tailing and capillary lifetime, are summarized. Using this method, the identities of rituximab and trastuzumab were confirmed, based on the correspondence between the biosimilars and reference products, noninterference of the sample matrix, and the ability to separate spiked samples of related mAbs. The RSD of the isoform content and migration time for the method repeatability were less than 2 and 1%, respectively.
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Jorgensen L, Groenning M, Roest N, Pinholt C, van de Weert M. The challenges in and importance of analysing protein structure and physical stability in complex formulations. J Drug Deliv Sci Technol 2013. [DOI: 10.1016/s1773-2247(13)50051-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Yao JF, Zhou N, Lv YJ, Zhang R, Liu KL, Xue M. Metabolic stability of long-acting luteinizing hormone-releasing hormone antagonists. Amino Acids 2012; 43:1557-66. [PMID: 22327511 DOI: 10.1007/s00726-012-1231-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2011] [Accepted: 01/20/2012] [Indexed: 11/24/2022]
Abstract
Long-acting luteinizing hormone-releasing hormone (LHRH) antagonists designed to be protease resistant consisted of a series of novel decapeptides structurally similar to LHRH. The aim of this study was to evaluate the in vitro metabolic stability of the LHRH decapeptides using pancreatin and homogenates models and identify the metabolites in rat liver homogenate for the purpose of illustrating the metabolic features of the decapeptides. The major metabolites in rat liver homogenate were identified by LC-ESI-MS(n). The half-lives of the 11 LHRH decapeptides were from 44 to 330 min in the pancreatin model. The half-lives of the five decapeptides in rat liver, kidney and lung homogenates were between 8 and 462 min. The most stable decapeptides were the LY616 and LY608 peptides with half-lives of 36 min in liver homogenate. Two major cleavage sites were found by analysing the metabolites of the LY618 peptide in rat liver homogenate, between the Pal(3)-Ser(4) and the Leu(7)-Ilys(8) peptide bonds. The major metabolites were produced via cleavages of peptide bonds at these sites, and further metabolic reactions such as hydroxylation, oxidative dechlorination, alcohol dehydration and isopropyl dealkylation were also observed.
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Affiliation(s)
- Jin-Feng Yao
- Department of Pharmacology, School of Basic Medical Sciences, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing, 100069, China
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11
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12
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Zölls S, Tantipolphan R, Wiggenhorn M, Winter G, Jiskoot W, Friess W, Hawe A. Particles in therapeutic protein formulations, Part 1: overview of analytical methods. J Pharm Sci 2011; 101:914-35. [PMID: 22161573 DOI: 10.1002/jps.23001] [Citation(s) in RCA: 163] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 10/31/2011] [Accepted: 11/08/2011] [Indexed: 12/13/2022]
Abstract
The presence of particles is a major issue during therapeutic protein formulation development. Both proteinaceous and nonproteinaceous particles need to be analyzed not only due to the requirements of the Pharmacopeias but also to monitor the stability of the protein formulation. Increasing concerns about the immunogenic potential together with new developments in particle analysis make a comparative description of established and novel analytical methods useful. Our review aims to provide a comprehensive overview on analytical methods for the detection and characterization of visible and subvisible particles in therapeutic protein formulations. We describe the underlying theory, benefits, shortcomings, and illustrative examples for quantification techniques, as well as characterization techniques for particle shape, morphology, structure, and identity.
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Affiliation(s)
- Sarah Zölls
- Coriolis Pharma, Am Klopferspitz 19, 82152 Martinsried-Munich, Germany
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13
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He Y, Lacher NA, Hou W, Wang Q, Isele C, Starkey J, Ruesch M. Analysis of identity, charge variants, and disulfide isomers of monoclonal antibodies with capillary zone electrophoresis in an uncoated capillary column. Anal Chem 2010; 82:3222-30. [PMID: 20345127 DOI: 10.1021/ac9028856] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A set of related capillary zone electrophoresis (CZE) methods have been developed for the analysis of identity, charge variants, and disulfide isoforms of IgG monoclonal antibodies (mAbs). These methods utilize an uncoated capillary column. The combined use of concentrated zwitterionic (e-amino-caproic acid) buffer and acid flushing was effective in minimizing the adsorption of protein to the inner wall of a bare capillary. Under these conditions, a selective and reproducible separation of multiple IgG1 and IgG2 monoclonal antibodies (mAbs) was obtained with a long capillary column (40 cm effective length), allowing the reliable identification of different mAbs by migration time. A rapid ( approximately 10 min) and selective separation of charged variants of IgG mAbs was attained using a short capillary column (10 cm effective length). Finally, the addition of urea in the separation buffer resulted in the separation of disulfide isoforms of IgG2 mAbs by CZE. CZE methods using an uncoated capillary column offer a versatile, generic, and economical approach to the evaluation of identity, charge heterogeneity, and disulfide isoforms of IgG antibodies.
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Affiliation(s)
- Yan He
- Analytical R&D, Pfizer BioTherapeutics R&D Pharmaceutical Sciences, 700 Chesterfield Parkway West, Chesterfield, Missouri 63017, USA.
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Vergote V, Burvenich C, Van de Wiele C, De Spiegeleer B. Quality specifications for peptide drugs: a regulatory-pharmaceutical approach. J Pept Sci 2009; 15:697-710. [DOI: 10.1002/psc.1167] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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van den Broek I, Sparidans RW, Schellens JH, Beijnen JH. Quantitative bioanalysis of peptides by liquid chromatography coupled to (tandem) mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2008; 872:1-22. [DOI: 10.1016/j.jchromb.2008.07.021] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2008] [Revised: 06/16/2008] [Accepted: 07/12/2008] [Indexed: 12/25/2022]
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van de Weert M, Jorgensen L, Horn Moeller E, Frokjaer S. Factors of importance for a successful delivery system for proteins. Expert Opin Drug Deliv 2005; 2:1029-37. [PMID: 16296807 DOI: 10.1517/17425247.2.6.1029] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Protein pharmaceuticals have matured into an important class of drugs, now comprising one in three novel drugs introduced on the market. However, significant gains are still to be made in reducing the costs of production, ensuring proper pharmacokinetics and efficacy, increasing patient compliance and convenience, and reducing side effects such as immunogenicity. This review summarises these issues and provides recent examples of methods to reduce costs, alter pharmacokinetics and increase patient compliance. It also discusses the increasing interest in understanding immunogenicity in order to prevent failure of the protein drug or serious life-threatening side effects due to autoimmunogenicity.
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Affiliation(s)
- Marco van de Weert
- The Danish University of Pharmaceutical Sciences, Biomacromolecules Group, Department of Pharmaceutics and Analytical Chemistry, Copenhagen, Denmark.
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17
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Hosoda H, Doi K, Nagaya N, Okumura H, Nakagawa E, Enomoto M, Ono F, Kangawa K. Optimum collection and storage conditions for ghrelin measurements: octanoyl modification of ghrelin is rapidly hydrolyzed to desacyl ghrelin in blood samples. Clin Chem 2004; 50:1077-80. [PMID: 15161728 DOI: 10.1373/clinchem.2003.025841] [Citation(s) in RCA: 177] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Hiroshi Hosoda
- Department of Biochemistry, National Cardiovascular Center Research Institute, Osaka 565-8565, Japan
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18
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Chapter 15 Electrophoresis of proteins and peptides. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s0301-4770(04)80028-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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19
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Orwa JA, Govaerts C, Gevers K, Roets E, Van Schepdael A, Hoogmartens J. Study of the stability of polymyxins B(1), E(1) and E(2) in aqueous solution using liquid chromatography and mass spectrometry. J Pharm Biomed Anal 2002; 29:203-12. [PMID: 12062679 DOI: 10.1016/s0731-7085(02)00016-x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Polymyxins B(1), E(1) (colistin A) and E(2) (colistin B) were subjected to degradation in aqueous solutions of different pH values (1.4, 3.4, 5.4 and 7.4) and at different temperatures (37, 50 and 60 degrees C) in order to investigate the characteristics of decomposition. The progress of decomposition was followed by reversed-phase liquid chromatography on YMC-Pack Pro, C-18 stationary phase. The degradation curves showed (pseudo) first order kinetics. The pH-rate profiles indicate that colistin is more susceptible to degradation in solutions of pH above 5 and is more stable in acidic media. The degradation of polymyxin B(1) was most rapid at pH 7.4. Qualitative analysis of the degradation products by LC/MS reveals that racemization is the major mechanism of degradation in both acidic and neutral media.
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Affiliation(s)
- J A Orwa
- Katholieke Universiteit Leuven, Faculteit Farmaceutische Wetenschappen, Laboratorium voor Farmaceutische Chemie en Analyse van Geneesmiddelen, Van Evenstraat 4, B-3000 Leuven, Belgium
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20
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Bartkowski R, Kitchel R, Peckham N, Margulis L. Aggregation of recombinant bovine granulocyte colony stimulating factor in solution. JOURNAL OF PROTEIN CHEMISTRY 2002; 21:137-43. [PMID: 12018614 DOI: 10.1023/a:1015364431227] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Aggregation of recombinant bovine granulocyte colony-stimulating factor (rbG-CSF) was examined by the techniques of size exclusion chromatography (SEC), multiangle laser light scattering (MALS), and SDS-PAGE. Solutions of rbG-CSF in different buffers and pH were exposed to an elevated temperature of 50 degrees C to induce aggregation. The formation of noncovalent soluble aggregates with molecular weight in the millions of Daltons was observed when a solution of rbG-CSF at pH 2.9 was exposed to 50 degrees C. Precipitated protein was the main product of rbG-CSF aggregation in citrate and phosphate buffers at a pH greater than 4. It was demonstrated that precipitant was a mixture of covalent and noncovalent aggregates. The ratio of covalent to noncovalent binding increased with increase in pH of the protein solution. The covalent binding that occurred was primarily due to disulfide linkages via intermolecular disulfide scrambling as demonstrated by SDS-PAGE.
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Affiliation(s)
- Richard Bartkowski
- Pfizer Global Manufacturing, Quality Operations, Groton, Connecticut 06340, USA.
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21
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Righetti PG. Capillary electrophoretic analysis of proteins and peptides of biomedical and pharmacological interest. Biopharm Drug Dispos 2001; 22:337-51. [PMID: 11835253 DOI: 10.1002/bdd.276] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Capillary electrophoresis (CE) is an automated approach to electrokinetic separations that has had a deep impact in all fields of life sciences, including biomedical and biotechnological research and clinical and forensic practice. The present review highlights aspects of peptides and proteins separations, with particular emphasis on macromolecular analytes of biomedical interest. Among the various CE techniques available, a novel methodology is here illustrated consisting in separations in acidic, isoelectric buffers, which have the advantage of protonating the silica wall, thus minimizing interactions of proteinaceous material with the siliceous surface, while allowing delivery of high voltage gradients, due to their low conductivities. The review ends with applications of CE to the analysis of folding/unfolding/refolding/misfolding of proteins, a field which has deep implications in the biomedical arena, since it is connected to a host of disorders, such as prion protein diseases.
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Affiliation(s)
- P G Righetti
- Department of Agricultural and Industrial Biotechnologies, University of Verona, Strada Le Grazie No. 15, 37134 Verona, Italy.
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Underberg WJ, Hoitink MA, Reubsaet JL, Waterval JC. Separation and detection techniques for peptides and proteins in stability research and bioanalysis. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2000; 742:401-9. [PMID: 10901145 DOI: 10.1016/s0378-4347(00)00198-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this paper, a brief overview of the most commonly used methods for the separation and analysis of peptides and proteins in stability and bioanalysis studies is presented. To investigate the physical stability of peptides and proteins, size-exclusion chromatography and electrophoretic separation techniques are being used, apart from several other methods. To determine the chemical stability of these compounds, separation systems are also important, with informative detection modes, such as various spectroscopic detections, electrochemical detection and mass spectrometric detection. For the bioanalysis of peptides, separation is the most important factor, while the detection must be done at the highest possible level of sensitivity.
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Affiliation(s)
- W J Underberg
- Department of Pharmaceutical Analysis and Toxicology, Faculty of Pharmacy, Utrecht University, The Netherlands.
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Mesfin FB, Bennett JA, Jacobson HI, Zhu S, Andersen TT. Alpha-fetoprotein-derived antiestrotrophic octapeptide. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1501:33-43. [PMID: 10727847 DOI: 10.1016/s0925-4439(00)00008-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Alpha-fetoprotein (AFP) is a major serum protein produced during fetal development. Experimental findings suggest that AFP has antiestrotrophic activity and that it can be developed as a therapeutic agent to treat existing estrogen-dependent breast cancer or to prevent premalignant foci from developing into breast cancer. The antiestrotrophic activity of AFP was reported to be localized to a peptide consisting of amino acids 447-480, a 34-mer peptide termed P447. A series of parsings and substitutions of amino acids in the P447 sequence was intended to identify the shortest analog which retained antiestrotrophic activity. Peptides related to P447 were generated using solid phase peptide synthesis. Several shorter peptides, including an 8-mer called P472-2 (amino acids 472-479, peptide sequence EMTPVNPG), retained activity, whereas peptides shorter than eight amino acid residues were inactive. The dose-related antiestrotrophic activity of AFP-derived peptides was determined in an immature mouse uterine growth assay that measures their ability to inhibit estradiol-stimulated uterine growth. In this assay, the maximal inhibitory activities exhibited by peptide P472-2 (49%), by peptide P447 (45%), and by intact AFP (35-45%) were comparable. The octapeptide P472-2 was also active against estradiol-stimulated growth of T47D human breast cancer cells in culture. These data suggest that peptide P472-2 is the minimal sequence in AFP, which retains the antiestrotrophic activity found with the full-length molecule. The synthetic nature and defined structure of this 8-mer peptide suggest that it can be developed into a new drug which opposes the action of estrogen, perhaps including the promotional effects of estradiol in the development of human breast cancer.
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Affiliation(s)
- F B Mesfin
- Department of Biochemistry and Molecular Biology, Mail Code 10, Albany Medical College, 47 New Scotland Ave., Albany, NY 12208, USA
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Abstract
This article gives a review of the recent developments in capillary electrophoresis (CE) of peptides. New approaches to the theoretical description of electromigration behavior of peptides are described, and methodological aspects of CE separations of peptides such as selection of separation conditions, sample treatment, suppression of peptide adsorption to the capillary wall and specificities of CE separation modes are discussed. Progress in application of high performance detection schemes, namely laser-induced fluorescence and mass spectrometry, in peptide separations by CE is presented. Applications of different CE techniques, zone electrophoresis, isotachophoresis, isoelectric focusing, affinity electrophoresis, electrokinetic chromatography and electrochromatography to peptide analysis, preparation and physicochemical characterization are demonstrated.
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Affiliation(s)
- V Kasicka
- Institute for Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague.
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