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Guzzo F, Buommino E, Landrum L, Russo R, Lembo F, Fiorentino A, D’Abrosca B. Phytochemical Investigation of Myrcianthes cisplatensis: Structural Characterization of New p-Coumaroyl Alkylphloroglucinols and Antimicrobial Evaluation against Staphylococcus aureus. PLANTS (BASEL, SWITZERLAND) 2023; 12:1046. [PMID: 36903907 PMCID: PMC10005737 DOI: 10.3390/plants12051046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 02/17/2023] [Accepted: 02/21/2023] [Indexed: 06/18/2023]
Abstract
Species of Myrtaceae Juss., the ninth largest family of flowering plants, are a valuable source of bioactive specialized metabolites. A leading position belongs to phloroglucinol derivatives, thanks to their unusual structural features and biological and pharmacological properties. Myrcianthes cisplatensis (Cambess.) O. Berg, a common tree on the banks of rivers and streams of Uruguay, southern Brazil, and northern Argentina, with aromatic leaves, is known as a diuretic, febrifuge, tonic, and good remedy for lung and bronchial diseases. Despite knowledge about traditional use, few data on its phytochemical properties have been reported in the literature. The methanol extract of M. cisplatensis, grown in Arizona, USA, was first partitioned between dichloromethane and water and then with ethyl acetate. The enriched fractions were evaluated using a broth microdilution assay against Staphylococcus aureus ATCC 29213 and 43300 (methicillin-resistant S. aureus (MRSA)). The potential antimicrobial activity seemed to increase in the dichloromethane extract, with a MIC value of 16 µg/mL against both strains. Following a bio-guided approach, chromatographic techniques allowed for isolating three coumarin derivatives, namely endoperoxide G3, catechin, and quercitrin, and four new p-coumaroyl alkylphloroglucinol glucosides, named p-coumaroylmyrciacommulone A-D. Their structures were characterized through spectroscopic techniques: 2D-NMR experiments (HSQC, HMBC, and HSQC-TOCSY) and spectrometric analyses (HR-MS). The antimicrobial assessment of pure compounds against S. aureus ATCC 29213 and ATCC 43300 demonstrated the best activity for p-coumaroylmyrciacommulone C and D with the growth inhibition of 50% at 32 µg/mL against both strains of S. aureus.
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Affiliation(s)
- Francesca Guzzo
- Department of Environmental Biological and Pharmaceutical Sciences and Technologies-DiSTABiF, University of Campania “Luigi Vanvitelli”, Via Vivaldi 43, 81100 Caserta, Italy
| | - Elisabetta Buommino
- Department of Pharmacy, University of Naples “Federico II”, Via Domenico Montesano 49, 80131 Naples, Italy
| | - Leslie Landrum
- School of Life Sciences, Arizona State University, Tempe, AZ 85287-4108, USA
| | - Rosita Russo
- Department of Environmental Biological and Pharmaceutical Sciences and Technologies-DiSTABiF, University of Campania “Luigi Vanvitelli”, Via Vivaldi 43, 81100 Caserta, Italy
| | - Francesca Lembo
- Department of Pharmacy, University of Naples “Federico II”, Via Domenico Montesano 49, 80131 Naples, Italy
| | - Antonio Fiorentino
- Department of Environmental Biological and Pharmaceutical Sciences and Technologies-DiSTABiF, University of Campania “Luigi Vanvitelli”, Via Vivaldi 43, 81100 Caserta, Italy
| | - Brigida D’Abrosca
- Department of Environmental Biological and Pharmaceutical Sciences and Technologies-DiSTABiF, University of Campania “Luigi Vanvitelli”, Via Vivaldi 43, 81100 Caserta, Italy
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Rashid F, Baghla R, Kale P, Shah M, Malakar D, Pillai M. Absolute Quantification of Follicle Stimulating Hormone (FSH) Using Its Signature Peptides and Enzymatic Digestion in Human Serum by UPLC/LC–MS/MS. Chromatographia 2021. [DOI: 10.1007/s10337-021-04057-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Turner BL, Kilgour KM, Stine SJ, Daniele M, Menegatti S. Dual-Affinity Ratiometric Quenching (DARQ) Assay for the Quantification of Therapeutic Antibodies in CHO-S Cell Culture Fluids. Anal Chem 2020; 92:16274-16283. [DOI: 10.1021/acs.analchem.0c04269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Brendan L. Turner
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, 911 Oval Drive, Raleigh, North Carolina 27695, United States
| | - Katie M. Kilgour
- Department of Chemical & Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27695, United States
| | - Sydney J. Stine
- Department of Chemical & Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27695, United States
| | - Michael Daniele
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, 911 Oval Drive, Raleigh, North Carolina 27695, United States
- Department of Electrical & Computer Engineering, North Carolina State University, 890 Oval Drive, Raleigh, North Carolina 27695, United States
| | - Stefano Menegatti
- Department of Chemical & Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27695, United States
- Biomanufacturing Training and Education Center (BTEC), 850 Oval Drive, Raleigh, North Carolina 27606, United States
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Intact mAb LC–MS for drug concentration from pre-clinical studies: bioanalytical method performance and in-life samples. Bioanalysis 2020; 12:1389-1403. [DOI: 10.4155/bio-2020-0168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Background: Antibody biotherapeutic measurement from pharmacokinetic studies has not been traditionally based on intact molecular mass as is the case for small molecules. However, recent advancements in protein capture and mass spectrometer technology have enabled intact mass detection and quantitation for dosed biotherapeutics. A bioanalytical method validation is part of the regulatory requirement for sample analysis to determine drug concentration from in-life study samples. Results/methodology: Here, an intact protein LC–MS assay is subjected to mock bioanalytical method validation, and unknown samples are compared between intact protein LC–MS and established bioanalytical assay formats: Ligand-binding assay and peptide LC–MS/MS. Discussion/conclusion: Results are presented from the intact and traditional bioanalytical method evaluations, where the in-life sample concentrations were comparable across method types with associated data analyses presented. Furthermore, for intact protein LC–MS, modification monitoring and evaluation of data processing parameters is demonstrated.
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Sandomenico A, Sivaccumar JP, Ruvo M. Evolution of Escherichia coli Expression System in Producing Antibody Recombinant Fragments. Int J Mol Sci 2020; 21:ijms21176324. [PMID: 32878291 PMCID: PMC7504322 DOI: 10.3390/ijms21176324] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 08/12/2020] [Accepted: 08/25/2020] [Indexed: 02/07/2023] Open
Abstract
Antibodies and antibody-derived molecules are continuously developed as both therapeutic agents and key reagents for advanced diagnostic investigations. Their application in these fields has indeed greatly expanded the demand of these molecules and the need for their production in high yield and purity. While full-length antibodies require mammalian expression systems due to the occurrence of functionally and structurally important glycosylations, most antibody fragments and antibody-like molecules are non-glycosylated and can be more conveniently prepared in E. coli-based expression platforms. We propose here an updated survey of the most effective and appropriate methods of preparation of antibody fragments that exploit E. coli as an expression background and review the pros and cons of the different platforms available today. Around 250 references accompany and complete the review together with some lists of the most important new antibody-like molecules that are on the market or are being developed as new biotherapeutics or diagnostic agents.
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Differential Secretome Profiling of Human Osteoarthritic Synoviocytes Treated with Biotechnological Unsulfated and Marine Sulfated Chondroitins. Int J Mol Sci 2020; 21:ijms21113746. [PMID: 32466468 PMCID: PMC7312545 DOI: 10.3390/ijms21113746] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/21/2020] [Accepted: 05/23/2020] [Indexed: 02/07/2023] Open
Abstract
Symptomatic slow-acting drugs (SYSADOA) are increasingly used as effective therapies for osteoarthritis, representing an attractive alternative to analgesics or non-steroidal anti-inflammatory drugs to relieve disease symptoms. Pharmaceutical preparations of chondroitin sulfate, derived from animal sources, alone or in combination with glucosamine sulfate, are widely recognized for their beneficial effect on osteoarthritis treatment. A growing interest has also been devoted to understanding the molecular mechanisms modulated by SYSADOA using -omic strategies, most of which rely on chondrocytes as a model system. In this work, by using an integrated strategy based on unbiased proteomics and targeted cytokine profiling by a multiplexed protein array, we identified differences in the secretomes of human osteoarthritic synoviocytes in response to biotechnological unsulfated, and marine sulfated chondroitins treatments. The combined strategy allowed the identification of candidate proteins showing both common and distinct regulation responses to the two treatments of chondroitins. These molecules, mainly belonging to ECM proteins, enzymes, enzymatic inhibitors and cytokines, are potentially correlated to treatment outcomes. Overall, the present results provide an integrated overview of protein changes in human osteoarthritic synoviocytes secretome associated to different chondroitin treatments, thus improving current knowledge of the biochemical effects driven by these drugs potentially involved in pathways associated to osteoarthritis pathogenesis.
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Schokker S, Fusetti F, Bonardi F, Molenaar RJ, Mathôt RA, van Laarhoven HW. Development and validation of an LC-MS/MS method for simultaneous quantification of co-administered trastuzumab and pertuzumab. MAbs 2020; 12:1795492. [PMID: 32744170 PMCID: PMC7531571 DOI: 10.1080/19420862.2020.1795492] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/23/2020] [Accepted: 07/06/2020] [Indexed: 10/28/2022] Open
Abstract
Given the increasing use of combination therapy with multiple monoclonal antibodies (mAbs), there is a clinical need for multiplexing assays. For the frequently co-administered anti-human epidermal growth factor receptor 2 (HER2) mAbs trastuzumab and pertuzumab, we developed a high-throughput and robust hybrid ligand-binding liquid chromatography-mass spectrometry (LC-MS)/MS quantitative assay. Nanomolar concentrations of trastuzumab and pertuzumab were determined in 10 µL serum samples after extraction by affinity purification through protein A beads, followed by on-bead reduction, alkylation, and trypsin digestion. After electrospray ionization, quantification was obtained by multiple reaction monitoring LC-MS/MS using SILuMab as an internal standard. The method was validated according to the current guidelines from the US Food and Drug Administration and the European Medicines Agency. Assay linearity was established in the ranges 0.250-250 μg/mL for trastuzumab and 0.500-500 μg/mL for pertuzumab. The method was accurate and selective for the simultaneous determination of trastuzumab and pertuzumab in clinical samples, thereby overcoming the limitation of ligand binding assays that cannot quantify mAbs targeting the same receptor. Furthermore, this method requires a small blood volume, which reduces blood collection time and stress for patients. The assay robustness was verified in a clinical trial where trastuzumab and pertuzumab concentrations were determined in 670 serum samples. As we used commercially available reagents and standards, the described generic bioanalytical strategy can easily be adapted to multiplex quantifications of other mAb combinations in non-clinical and clinical samples.
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Affiliation(s)
- Sandor Schokker
- Department of Medical Oncology, Cancer Center Amsterdam (CCA), Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
| | - Fabrizia Fusetti
- Department of Business Development Bioanalysis Europe, QPS Netherlands BV, Groningen, The Netherlands
| | - Francesco Bonardi
- Department of Business Development Bioanalysis Europe, QPS Netherlands BV, Groningen, The Netherlands
| | - Remco J. Molenaar
- Department of Medical Oncology, Cancer Center Amsterdam (CCA), Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
| | - Ron A.A. Mathôt
- Department of Hospital Pharmacy, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
| | - Hanneke W.M. van Laarhoven
- Head of Department of Medical Oncology, Cancer Center Amsterdam (CCA), Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
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Investigating the oxidative refolding mechanism of Cripto-1 CFC domain. Int J Biol Macromol 2019; 137:1179-1189. [DOI: 10.1016/j.ijbiomac.2019.07.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 07/05/2019] [Accepted: 07/06/2019] [Indexed: 01/19/2023]
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Penna E, Cerciello A, Chambery A, Russo R, Cernilogar FM, Pedone EM, Perrone-Capano C, Cappello S, Di Giaimo R, Crispino M. Cystatin B Involvement in Synapse Physiology of Rodent Brains and Human Cerebral Organoids. Front Mol Neurosci 2019; 12:195. [PMID: 31467503 PMCID: PMC6707391 DOI: 10.3389/fnmol.2019.00195] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Accepted: 07/29/2019] [Indexed: 12/12/2022] Open
Abstract
Cystatin B (CSTB) is a ubiquitous protein belonging to a superfamily of protease inhibitors. CSTB may play a critical role in brain physiology because its mutations cause progressive myoclonic epilepsy-1A (EPM1A), the most common form of progressive myoclonic epilepsy. However, the molecular mechanisms underlying the role of CSTB in the central nervous system (CNS) are largely unknown. To investigate the possible involvement of CSTB in the synaptic plasticity, we analyzed its expression in synaptosomes as a model system in studying the physiology of the synaptic regions of the CNS. We found that CSTB is not only present in the synaptosomes isolated from rat and mouse brain cortex, but also secreted into the medium in a depolarization-controlled manner. In addition, using biorthogonal noncanonical amino acid tagging (BONCAT) procedure, we demonstrated, for the first time, that CSTB is locally synthesized in the synaptosomes. The synaptic localization of CSTB was confirmed in a human 3D model of cortical development, namely cerebral organoids. Altogether, these results suggest that CSTB may play a role in the brain plasticity and open a new perspective in studying the involvement of CSTB deregulation in neurodegenerative and neuropsychiatric diseases.
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Affiliation(s)
- Eduardo Penna
- Department of Biology, University of Naples Federico II, Naples, Italy
| | - Angela Cerciello
- Department of Biology, University of Naples Federico II, Naples, Italy
| | - Angela Chambery
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania "Luigi Vanvitelli", Caserta, Italy
| | - Rosita Russo
- Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, University of Campania "Luigi Vanvitelli", Caserta, Italy
| | - Filippo M Cernilogar
- Division of Molecular Biology, Biomedical Center, Faculty of Medicine, LMU, Munich, Germany
| | - Emilia Maria Pedone
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Naples, Italy
| | - Carla Perrone-Capano
- Department of Pharmacy, University of Naples Federico II, Naples, Italy.,Institute of Genetics and Biophysics "Adriano Buzzati Traverso", National Research Council (CNR), Naples, Italy
| | - Silvia Cappello
- Department of Developmental Neurobiology, Max Planck Institute of Psychiatry, Munich, Germany
| | - Rossella Di Giaimo
- Department of Biology, University of Naples Federico II, Naples, Italy.,Department of Developmental Neurobiology, Max Planck Institute of Psychiatry, Munich, Germany
| | - Marianna Crispino
- Department of Biology, University of Naples Federico II, Naples, Italy
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Caporale A, Monti A, Selis F, Sandomenico A, Tonon G, Ruvo M, Doti N. A comparative analysis of catalytic activity and stability of microbial transglutaminase in controlled denaturing conditions. J Biotechnol 2019; 302:48-57. [PMID: 31229602 DOI: 10.1016/j.jbiotec.2019.06.299] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 06/12/2019] [Accepted: 06/17/2019] [Indexed: 10/26/2022]
Abstract
Microbial transglutaminases (MTGs) catalyzes the formation of Gln-Lys isopeptide bonds and are widely used for the cross-linking of proteins and peptides in food and in biotechnological applications for bioconjugation reactions. In view of its practical utility, a comparative study of the catalytic activity and stability of the enzyme in a wide range of denaturing conditions has been performed through Circular Dichroism (CD), fluorescence and activity assays performed with model substrates. In agreement with previous results, we show that MTG has a significant structural and functional tolerance to pH changes, whereas the enzyme stability and activity decrease in presence of increasing amounts of denaturing agents, such as urea and guanidinium chloride (GdnHCl). Noteworthy, the activity of MTG in denaturing conditions differs markedly from that in pseudo-physiological settings, shifting unexpectedly toward higher substrate specificity. Also, the use of controlled amounts of denaturing agents (1.0-1.5 M urea) largely improves yields and purity of the final products of 10-15% and 25-30%, respectively. These findings widen the range of applicability of the MTG-mediated biocatalysis for industrial and biotechnological purposes.
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Affiliation(s)
| | - Alessandra Monti
- IBB-CNR, Via Mezzocannone 16, 80134, Napoli, Italy; Università degli studi della Campania "Luigi Vanvitelli", Via Vivaldi n. 43 - 81100 Caserta, Caserta, Italy
| | - Fabio Selis
- BIOVIIIx, via Brin, 59, 80142, Napoli, Italy
| | | | | | - Menotti Ruvo
- IBB-CNR, Via Mezzocannone 16, 80134, Napoli, Italy.
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Li GS, Dong X, Fan X, You CY, Wu G, Zhao YP, Lu Y, Wei XY, Ma FY. Evaluation of coal-related model compounds using tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:1462-1472. [PMID: 29740899 DOI: 10.1002/rcm.8163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 04/26/2018] [Accepted: 04/29/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Gas chromatography/mass spectrometry (GC/MS) is a routine and basic instrumental method for the analysis of complex coal conversion products in the chemical industry. To further enhance the practical potential of GC/MS in chemical industry, a tandem MS method for the selection of ion pairs applied in monitoring coal conversions was established using GC/quadrupole time-of-flight MS (GC/Q-TOF MS). The corresponding fragmentation pathways were explored and suitable ion pairs were screened. METHODS Fourteen coal-related model compounds (CRMCs) were analyzed using GC/Q-TOF MS with different collision-induced dissociation (CID) energies (5-20 eV). The fragmentation pathways can offer a better understanding of chemical bond breaking, hydrogen transfer, rearrangement reactions and elimination of neutral fragments for CRMCs during the CID process. RESULTS The precursor ions of aromatic hydrocarbons without alkyl chains were difficult to fragment with a CID energy of 20 eV. But aromatic hydrocarbons with branched chains were prone to fragment via the loss of alkyl chains and further fragmented through ring-opening reactions. Compared with the Calk Car bond, the Car Car bond was difficult to fragment due to its high bond dissociation energy. The existence of heteroatoms facilitated fragmentation that was conducive to the screening of ion pairs. CONCLUSIONS The CID technique of GC/Q-TOF MS will contribute to studies on the organic composition of coals and to building monitoring methods for coal conversions via fragmentation and ion pair selection.
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Affiliation(s)
- Guo-Sheng Li
- China University of Mining & Technology, Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, Xuzhou, Jiangsu, 221116, China
| | - Xueming Dong
- Purdue University, Department of Chemistry, Brown Building, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - Xing Fan
- China University of Mining & Technology, Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, Xuzhou, Jiangsu, 221116, China
- Xinjiang University, Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering, Urumqi, 830046, China
| | - Chun-Yan You
- China University of Mining & Technology, Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, Xuzhou, Jiangsu, 221116, China
| | - Ge Wu
- Purdue University, Krannert School of Management, Brown Building, 403 W State Street, West Lafayette, IN, 47907, USA
| | - Yun-Peng Zhao
- China University of Mining & Technology, Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, Xuzhou, Jiangsu, 221116, China
| | - Yao Lu
- China University of Mining & Technology, Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, Xuzhou, Jiangsu, 221116, China
- China University of Mining & Technology, Advanced Analysis & Computation Center, Xuzhou, 221116, China
| | - Xian-Yong Wei
- China University of Mining & Technology, Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, Xuzhou, Jiangsu, 221116, China
| | - Feng-Yun Ma
- Xinjiang University, Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering, Urumqi, 830046, China
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van Rosmalen M, Ni Y, Vervoort DFM, Arts R, Ludwig SKJ, Merkx M. Dual-Color Bioluminescent Sensor Proteins for Therapeutic Drug Monitoring of Antitumor Antibodies. Anal Chem 2018; 90:3592-3599. [PMID: 29443503 PMCID: PMC5843950 DOI: 10.1021/acs.analchem.8b00041] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Monitoring the levels of therapeutic antibodies in individual patients would allow patient-specific dose optimization, with the potential for major therapeutic and financial benefits. Our group recently developed a new platform of bioluminescent sensor proteins (LUMABS; LUMinescent AntiBody Sensor) that allow antibody detection directly in blood plasma. In this study, we targeted four clinically important therapeutic antibodies, the Her2-receptor targeting trastuzumab, the anti-CD20 antibodies rituximab and obinutuzumab, and the EGFR-blocking cetuximab. A strong correlation was found between the affinity of the antibody binding peptide and sensor performance. LUMABS sensors with physiologically relevant affinities and decent sensor responses were obtained for trastuzumab and cetuximab using mimotope and meditope peptides, respectively, with affinities in the 10-7 M range. The lower affinity of the CD20-derived cyclic peptide employed in the anti-CD20 LUMABS sensor ( Kd = 10-5 M), translated in a LUMABS sensor with a strongly attenuated sensor response. The trastuzumab and cetuximab sensors were further characterized with respect to binding kinetics and their performance in undiluted blood plasma. For both antibodies, LUMABS-based detection directly in plasma compared well to the analytical performance of commercial ELISA kits. Besides identifying important design parameters for the development of new LUMABS sensors, this work demonstrates the potential of the LUMABS platform for point-of-care detection of therapeutic antibodies.
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Affiliation(s)
- Martijn van Rosmalen
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering , Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven , The Netherlands
| | - Yan Ni
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering , Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven , The Netherlands
| | - Daan F M Vervoort
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering , Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven , The Netherlands
| | - Remco Arts
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering , Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven , The Netherlands
| | - Susann K J Ludwig
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering , Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven , The Netherlands
| | - Maarten Merkx
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems (ICMS), Department of Biomedical Engineering , Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven , The Netherlands
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