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Goumenou A, Chendo C, Combès A, Fournier T, Pichon V, Delaunay N. Characterization of Concanavalin A-based lectin sorbents for the extraction of the human chorionic gonadotropin glycoforms prior to analysis by nano liquid chromatography-high resolution mass spectrometry. J Pharm Biomed Anal 2024; 242:116022. [PMID: 38354538 DOI: 10.1016/j.jpba.2024.116022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 01/24/2024] [Accepted: 02/06/2024] [Indexed: 02/16/2024]
Abstract
Human chorionic gonadotropin (hCG) is constituted of the hCGα and hCGβ subunits and is a highly glycosylated protein. Affinity supports based on immobilized Concanavalin A (Con A) lectin were used in solid phase extraction (SPE) to fractionate the hCG glycoforms according to their glycosylation state. For the first time, the lectin SPE fractions were off-line analysed by a nano liquid chromatography - high-resolution mass spectrometry (nanoLC-HRMS) method keeping the glycoforms intact. For this, home-made Con A sorbents were prepared by immobilizing lectin on Sepharose with a mean grafting yield of 98.2% (relative standard deviation (RSD) of 3.5%, n = 15). A capacity of about 100 μg of purified urinary hCG (uhCG) per ml of sorbent, grafted with a density of 10 mg of Con A per ml, was estimated. Average extraction yields of around 60% for both hCGα and hCGβ glycoforms were obtained after optimization of the extraction protocol. Intra- and inter-assay evaluation led to average RSD values of around 10%, indicating a repeatable extraction procedure. Similar results were obtained with commercial Con A-based sorbents but only after their 3rd use or after an extensive pre-conditioning step. Finally, the Con A SPE led to the fractionation of some glycoforms of uhCG, allowing the detection of an hCGα glycoform with two tetra-antennary N-glycans that couldn't be detected by direct analysis in nanoLC-HRMS without Con A SPE. Regarding a recombinant hCG, a fractionation was also observed leading to the detection of unretained hCGα glycoforms with tri-antennary N-glycans. Therefore, the combination of lectin SPE with intact protein analysis by nanoLC-HRMS can contribute to a more detailed glycosylation characterization of the hCG protein.
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Affiliation(s)
- Anastasia Goumenou
- Laboratory of Analytical, Bioanalytical Sciences and Miniaturization, Chemistry, Biology and Innovation (CBI) UMR 8231, ESPCI Paris PSL, CNRS, PSL Research University, Paris, France
| | - Christophe Chendo
- Laboratory of Analytical, Bioanalytical Sciences and Miniaturization, Chemistry, Biology and Innovation (CBI) UMR 8231, ESPCI Paris PSL, CNRS, PSL Research University, Paris, France
| | - Audrey Combès
- Laboratory of Analytical, Bioanalytical Sciences and Miniaturization, Chemistry, Biology and Innovation (CBI) UMR 8231, ESPCI Paris PSL, CNRS, PSL Research University, Paris, France
| | - Thierry Fournier
- Université Paris Cité, INSERM, "Pathophysiology & Pharmacotoxicology of the Human Placenta, pre & postnatal Microbiota", 3PHM, F-75006 Paris, France
| | - Valérie Pichon
- Laboratory of Analytical, Bioanalytical Sciences and Miniaturization, Chemistry, Biology and Innovation (CBI) UMR 8231, ESPCI Paris PSL, CNRS, PSL Research University, Paris, France; Sorbonne Université, Paris, France
| | - Nathalie Delaunay
- Laboratory of Analytical, Bioanalytical Sciences and Miniaturization, Chemistry, Biology and Innovation (CBI) UMR 8231, ESPCI Paris PSL, CNRS, PSL Research University, Paris, France.
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Ferreira L, Flanagan SP, Fogel R, Limson JL. Generation of epitope-specific hCG aptamers through a novel targeted selection approach. PLoS One 2024; 19:e0295673. [PMID: 38394285 PMCID: PMC10890750 DOI: 10.1371/journal.pone.0295673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 11/28/2023] [Indexed: 02/25/2024] Open
Abstract
Human chorionic gonadotropin (hCG) is a glycoprotein hormone used as a biomarker for several medical conditions, including pregnancy, trophoblastic and nontrophoblastic cancers. Most commercial hCG tests rely on a combination of antibodies, one of which is usually specific to the C-terminal peptide of the β-subunit. However, cleavage of this region in many hCG degradation variants prevents rapid diagnostic tests from quantifying all hCG variants in serum and urine samples. An epitope contained within the core fragment, β1, represents an under-researched opportunity for developing immunoassays specific to most variants of hCG. In the study described here, we report on a SELEX procedure tailored towards the identification of two pools of aptamers, one specific to the β-subunit of hCG and another to the β1 epitope within it. The described SELEX procedure utilized antibody-blocked targets, which is an underutilized strategy to exert negative selection pressure and in turn direct aptamer enrichment to a specific epitope. We report on the first aptamers, designated as R4_64 and R6_5, each capable of recognising two distinct sites of the hCG molecule-the β-subunit and the (presumably) β1-epitope, respectively. This study therefore presents a new SELEX approach and the generation of novel aptamer sequences that display potential hCG-specific biorecognition.
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Affiliation(s)
- Lauren Ferreira
- Biotechnology Innovation Centre, Rhodes University, Grahamstown, Eastern Cape, South Africa
| | - Shane Patrick Flanagan
- Biotechnology Innovation Centre, Rhodes University, Grahamstown, Eastern Cape, South Africa
| | - Ronen Fogel
- Biotechnology Innovation Centre, Rhodes University, Grahamstown, Eastern Cape, South Africa
| | - Janice Leigh Limson
- Biotechnology Innovation Centre, Rhodes University, Grahamstown, Eastern Cape, South Africa
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Huang N, Lang Q, Li L, Ge L, Yang X. Characterization of monoclonal antibodies against porcine epidemic diarrhea virus S1/S2 junction protein. AMB Express 2023; 13:74. [PMID: 37436550 DOI: 10.1186/s13568-023-01573-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 06/18/2023] [Indexed: 07/13/2023] Open
Abstract
Pig producers have faced considerable economic losses due to porcine epidemic diarrhea virus (PEDV) infection, emphasizing the need for PEDV antibody development. The S1/S2 junction (S1S2J) cleavage site of the S protein of PEDV is one of the major determinants of coronavirus infection success. In this study, we specifically selected the S1S2J protein of PEDV-AJ1102 (a representative strain of the G2 type) as a target protein to immunize mice and generated monoclonal antibodies (mAbs) using hybridoma technology. Three mAbs with high-binding activities to the S1S2J protein and were obtained and further analyzed. To reveal the characterization of these mAbs, variable region genes of antibodies were studied by using DNA sequencing, thereby revealing differences in their CDR3 amino acid sequences. We then developed a new method to identify the isotypes of these three mAbs. Results showed that these three antibodies were of the IgM type. As for the functions of these three mAbs, indirect immunofluorescence assay confirmed their good binding ability to Vero E6 cells infected with the PEDV-SP-C strain (G1 type). Epitope analysis showed linear epitopes for all three mAbs. These antibodies were also used to detect infected cells via flow cytometry analysis. In summary, we prepared and examined three mAbs against PEDV-S1S2J. These mAbs can be employed as detection antibodies for diagnostic reagents and further developed for other applications. We also designed a novel technique for easy and cost-saving identification of isotypes of mouse mAbs. Our results lay a good foundation for the development of research on PEDV.
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Affiliation(s)
- Nan Huang
- Chongqing Academy of Animal Sciences, Chongqing, 402460, China
- National Center of Technology Innovation for Pigs, Chongqing, 402460, China
- Key Laboratory of Pig Industry Sciences, Ministry of Agriculture, Chongqing, 402460, China
| | - Qiaoli Lang
- Chongqing Academy of Animal Sciences, Chongqing, 402460, China
- National Center of Technology Innovation for Pigs, Chongqing, 402460, China
- Key Laboratory of Pig Industry Sciences, Ministry of Agriculture, Chongqing, 402460, China
| | - Liping Li
- Chongqing Academy of Animal Sciences, Chongqing, 402460, China
- National Center of Technology Innovation for Pigs, Chongqing, 402460, China
- Key Laboratory of Pig Industry Sciences, Ministry of Agriculture, Chongqing, 402460, China
| | - Liangpeng Ge
- Chongqing Academy of Animal Sciences, Chongqing, 402460, China.
- National Center of Technology Innovation for Pigs, Chongqing, 402460, China.
- Key Laboratory of Pig Industry Sciences, Ministry of Agriculture, Chongqing, 402460, China.
| | - Xi Yang
- Chongqing Academy of Animal Sciences, Chongqing, 402460, China.
- National Center of Technology Innovation for Pigs, Chongqing, 402460, China.
- Key Laboratory of Pig Industry Sciences, Ministry of Agriculture, Chongqing, 402460, China.
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Liu Y, Sulaiman HF, Johnson BR, Ma R, Gao Y, Fernando H, Amarasekara A, Ashley-Oyewole A, Fan H, Ingram HN, Briggs JM. QM/MM study of N501 involved intermolecular interaction between SARS-CoV-2 receptor binding domain and antibody of human origin. Comput Biol Chem 2023; 102:107810. [PMID: 36610304 PMCID: PMC9811887 DOI: 10.1016/j.compbiolchem.2023.107810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/02/2023] [Accepted: 01/03/2023] [Indexed: 01/06/2023]
Abstract
Intermolecular interaction between key residue N501 of the epitope on SARS-CoV-2 RBD and screening antibody B38 was studied using the QM/MM and QM approach. The QM/MM optimized geometry shows that angle X-H---Y is 165° for O-H---O between mAb light chain S30 and RBD N501. High level MP2 calculations indicated the interaction between RBD N501 and S30 of B38 Fab light chain provide a relatively strong attractive force of - 3.32 kcal/mol, whereas the hydrogen bond between RBD Q498 and S30 was quantified as 0.10 kcal/mol. The decrease in ESP partial charge on hydrogen atom of hydroxyl group on S30 drops from 0.38 a.u. to 0.31 a.u., exhibiting the sharing of 0.07 a.u. from the lone pair electron oxygen of N501 due to hydrogen bond formation. The NBO occupancy of hydrogen atom also decreases from 25.79 % to 22.93 % in the hydroxyl H-O NBO bond of S30. However, the minor change of NBO hybridization of hydroxyl oxygen of S30 from sp3.00 to sp3.05 implies the rigidity of hydrogen bond tetrahedral geometry in the relative dynamic protein complex. The O-H---O angle is 165° which is close but not exactly linear. The structural requirement for sp3 hybridization of oxygen for hydroxyl group on S30 and dimension of protein likely prevent O-H---O from adopting linear geometry. The hydrogen bond strengths were also calculated using a variety of DFT methods, and the result of - 3.33 kcal/mol from the M06L method is the closest to that of the MP2 calculation. Results of this work may aid in the COVID-19 vaccine and drug screening.
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Affiliation(s)
- Yuemin Liu
- Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, the United States of America,Department of Chemistry, Rice University, Houston, TX 77005, the United States of America,Corresponding author at: Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, the United States of America
| | - Hana F. Sulaiman
- Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, the United States of America
| | - Bruce R. Johnson
- Department of Chemistry, Rice University, Houston, TX 77005, the United States of America
| | - Rulong Ma
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77004, the United States of America
| | - Yunxiang Gao
- Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, the United States of America
| | - Harshica Fernando
- Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, the United States of America
| | - Ananda Amarasekara
- Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, the United States of America
| | - Andrea Ashley-Oyewole
- Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, the United States of America
| | - Huajun Fan
- College of Chemical Engineering, Sichuan University Science and Engineering, Zigong, Sichuan 643000, PR China
| | - Heaven N. Ingram
- Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, the United States of America
| | - James M. Briggs
- Department of Biology and Biochemistry, University of Houston, Houston, TX 77004, the United States of America
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Del Valle García R, Cazanave Mora JM, Carrazana San Martín NL, Zulueta Rodríguez O, Melchor Rodríguez A, Hernández Pérez L, López Cisneros R, Lorenzo Rojas A, Gato Orozco ED, Benítez Gordillo D, González Quintero A, García de la Rosa I, Coto Rodeiro R. An enzyme immunoassay to determine human chorionic gonadotropin (HCG) in serum and urine samples using an ultra-microanalytical system. J Pharm Biomed Anal 2021; 204:114239. [PMID: 34252818 DOI: 10.1016/j.jpba.2021.114239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 06/29/2021] [Accepted: 06/30/2021] [Indexed: 10/21/2022]
Abstract
The determination of Human Chorionic Gonadotropin (HCG) in biological fluids is of great interest in the early pregnancy diagnostics, the evaluation of pregnancy disorders, as a tumor marker, as a screening procedure for anti-doping control, and many other purposes. A simple sandwich-type UltraMicro Enzyme-Linked ImmunoSorbent Assay (UMELISA) has been developed for the measurement of HCG in serum and urine samples. Strips coated with a high affinity MAb directed against HCG are used as solid phase, to ensure the specificity of the assay. The HCG assay was completed in 1.5 h, with a measuring range of 0.76-400 mIU/mL. The intra- and inter-assay coefficients of variation were lower than 10 %, depending on the HCG concentrations evaluated. Recovery percentages were 96.43-97.16 % (serum) and 98.10-99.04 % (urine). The assay detected intact HCG, nicked HCG, HCG β, and nicked HCG β, and did not recognize any of the interfering molecules tested. Regression analysis showed a good correlation with Elecsys in serum (n = 1459, r = 0.952, ρc = 0.948) and urine (n = 869, r = 0.988, ρc = 0.978). A good correlation was also found with 84 RIQAS samples analyzed with the kits Elecsys (r = 0.969, ρc = 0.957), Architect (r = 0.982, ρc = 0.970), Dimension (r = 0.989, ρc = 0.977), and Bioscience (r = 0.992, ρc = 0.980), all with a p < 0.01. Comparison with transvaginal ultrasonography in early pregnancy detection showed a specificity and a sensitivity of 100 % (n = 2385, κ = 1). The analytical performance characteristics of UMELISA HCG endorse its use for the quantification of HCG in serum and urine samples. This assay will make a cost-effective diagnostic kit accessible to low-income countries and is now available in the Cuban Public Health System.
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Camperi J, Combès A, Fournier T, Pichon V, Delaunay N. Analysis of the human chorionic gonadotropin protein at the intact level by HILIC-MS and comparison with RPLC-MS. Anal Bioanal Chem 2020; 412:4423-4432. [DOI: 10.1007/s00216-020-02684-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 04/01/2020] [Accepted: 04/24/2020] [Indexed: 12/25/2022]
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7
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Development of Immobilized Enzyme Reactors for the characterization of the glycosylation heterogeneity of a protein. Talanta 2020; 206:120171. [DOI: 10.1016/j.talanta.2019.120171] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 07/17/2019] [Accepted: 07/22/2019] [Indexed: 11/19/2022]
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Glycan Analysis as Biomarkers for Testicular Cancer. Diagnostics (Basel) 2019; 9:diagnostics9040156. [PMID: 31652641 PMCID: PMC6963830 DOI: 10.3390/diagnostics9040156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/13/2019] [Accepted: 10/19/2019] [Indexed: 12/24/2022] Open
Abstract
The U.S. Preventive Services Task Force does not recommend routine screening for testicular cancer (TC) in asymptomatic men, essentially because serological testicular cancer (TC) biomarkers are not reliable. The main reason is that two of the most important TC biomarkers, α-fetoprotein (AFP) and human chorionic gonadotropin (hCG), are not produced solely due to TC. Moreover, up to 40% of patients with TC do not have elevated serological biomarkers, which is why serial imaging with CT is the chief means of monitoring progress. On the other hand, exposure to radiation can lead to an increased risk of secondary malignancies. This review provides the first comprehensive account of the applicability of protein glycoprofiling as a promising biomarker for TC with applications in disease diagnostics, monitoring and recurrence evaluation. The review first deals with the description and classification of TC. Secondly, the limitations of current TC biomarkers such as hCG, AFP and lactate dehydrogenase are provided together with an extensive overview of the glycosylation of hCG and AFP related to TC. The final part of the review summarises the potential of glycan changes on either hCG and AFP as TC biomarkers for diagnostics and prognostics purposes, and for disease recurrence evaluation. Finally, an analysis of glycans in serum and tissues as TC biomarkers is also provided.
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Camperi J, Pichon V, Fournier T, Delaunay N. First profiling in hydrophilic interaction liquid chromatography of intact human chorionic gonadotropin isoforms. J Pharm Biomed Anal 2019; 174:495-499. [DOI: 10.1016/j.jpba.2019.06.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 04/10/2019] [Accepted: 06/10/2019] [Indexed: 01/01/2023]
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Camperi J, De Cock B, Pichon V, Combes A, Guibourdenche J, Fournier T, Vander Heyden Y, Mangelings D, Delaunay N. First characterizations by capillary electrophoresis of human Chorionic Gonadotropin at the intact level. Talanta 2019; 193:77-86. [DOI: 10.1016/j.talanta.2018.09.095] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 09/20/2018] [Accepted: 09/24/2018] [Indexed: 12/15/2022]
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Clerico A, Belloni L, Carrozza C, Correale M, Dittadi R, Dotti C, Fortunato A, Vignati G, Zucchelli GC, Migliardi M. A Black Swan in clinical laboratory practice: the analytical error due to interferences in immunoassay methods. Clin Chem Lab Med 2018; 56:397-402. [PMID: 29220884 DOI: 10.1515/cclm-2017-0881] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 10/22/2017] [Indexed: 12/11/2022]
Abstract
It is well known that the results of immunoassay methods can be affected by specific or non-specific interferences, ranging from 0.4% to 4.0%. The presence of interference may greatly compromise the accuracy of immunoassay analyses causing an error in the measurement, producing false-positive or false-negative results. From a clinical point of view, these analytical errors may have serious implications for patient care because they can cause misdiagnosis or inappropriate treatment. Unfortunately, it is a very difficult task to identify the irregular analytical errors related to immunoassay methods because they are not detectable by normal laboratory quality control procedures, are reproducible within the test system, may be clinically plausible and are relatively rare. The first line of defense against erroneous results is to use in laboratory practice only immunoassay systems with the highest level of robustness against interference. The second line of defense is always taking into account the possibility of interference in immunoassay results. A correct approach should be addressed on identification of samples at high risk of interference. The attainment of this goal requires a critical review of the test result in relation to patient's clinical conditions and literature data, taking into account the analytical characteristics of the immunoassay system. The experts in immunoassay systems should make every effort to find some specific and reliable quality indicators for irregular analytical errors in order to better detect and monitor erroneous immunoassay results due to specific or non-specific interferences.
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Affiliation(s)
- Aldo Clerico
- Laboratory of Cardiovascular Endocrinology and Cell Biology, Department of Laboratory Medicine, Fondazione CNR Toscana G. Monasterio, Scuola Superiore Sant'Anna, Via Trieste 41, 56126 Pisa, Italy
| | - Lucia Belloni
- Dipartimento di Medicina di laboratorio, Arcispedale Santa Maria Nuova - IRCCS, Reggio Emilia, Italy
| | - Cinzia Carrozza
- Laboratorio Analisi 1, Fondazione Policlinico Universitario "A. Gemelli", Roma, Italy
| | - Mario Correale
- Clinical Pathology Unit, IRCCS De Bellis, Castellana Grotte, Bari, Italy
| | - Ruggero Dittadi
- Medicina di Laboratorio, Ospedale dell'Angelo ULSS 3 Serenissima, Mestre, Italy
| | - Claudio Dotti
- Dipartimento di Medicina di laboratorio, Arcispedale Santa Maria Nuova - IRCCS, Reggio Emilia, Italy
| | - Antonio Fortunato
- U.O.C. Patologia Clinica, ASUR Marche Area Vasta 5, Ascoli Piceno, Italy
| | | | | | - Marco Migliardi
- S.C. Laboratorio Analisi, A.O. Ordine Mauriziano di Torino, Torino, Italy
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An attempt to characterize the human Chorionic Gonadotropin protein by reversed phase liquid chromatography coupled with high-resolution mass spectrometry at the intact level. J Pharm Biomed Anal 2018; 161:35-44. [DOI: 10.1016/j.jpba.2018.07.056] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 07/18/2018] [Accepted: 07/30/2018] [Indexed: 12/26/2022]
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13
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Point-of-Care Pregnancy Testing. POINT OF CARE 2016. [DOI: 10.1097/poc.0000000000000112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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