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Lv Q, Yu HL, Yang Y, Meng FH, Dai XD, Jiang PY, Liu CC. Screening of monoclonal antibodies against specific phosphonylation sites and analysis of serum samples exposed to soman and VX using an indirect competitive enzyme-linked immunosorbent assay. Anal Bioanal Chem 2022; 414:2713-2724. [PMID: 35083511 DOI: 10.1007/s00216-022-03914-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 11/16/2021] [Revised: 01/13/2022] [Accepted: 01/18/2022] [Indexed: 12/13/2022]
Abstract
Organophosphorus nerve agents (OPNAs) covalently bind to tyrosine 411 of human serum albumin (HSA) and the formed adducts are stable biomarkers of OPNA exposure. The detection of these adducts has been limited to mass spectrometry techniques combined with protein digestion. Here, we developed indirect competitive ELISA (icELISA) methods to verify OPNA exposure by the detection of OPNA-phosphonylated adducts at tyrosine 411 residue (OPNA-HSA adducts), in which monoclonal antibodies (mAbs) against phosphonylation sites at tyrosine 411 were introduced. The two mAbs were prepared by the fourth generation of rabbit mAb technology using the phosphonylated peptides of LVRY(GD or VX)TKKVPQC as the haptens. These mAbs were screened using our developed competitive ELISA method and then selected based on their individual affinity and selectivity. As a result, we obtained two mAbs that recognized the HSA Tyr 411 adduct of GD (mAb-5G2) or VX (mAb-12B9), respectively. They shared the highest affinity exhibiting a Kd value of about 10-6 mol/L of the OPNA exposure concentration. They also had remarkable selectivity, which could especially recognize their individual OPNA-HSA adducts in a native state but did not recognize other OPNA-HSAs and unadducted HSAs. Especially for mAb-12B9, it could clearly distinguish VX-HSA and GB-HSA between which there was only one alkyl difference in their phosphonyl portion of the adducted sites. The two mAbs were then used to build the icELISA method for analysis of the serum samples exposed to OPNA. It was found that the detectable lowest GD- and VX-exposed concentrations in serum samples were respectively 1.0 × 10-6 mol/L and 10.0 × 10-6 mol/L. This study provides one novel approach and strategy for the retrospective detection of OPNA exposure, and the two mAbs have great potential to be extended for point-of-care testing of OPNA intoxication.
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Affiliation(s)
- Qiao Lv
- State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China
- Laboratory of Analytical Chemistry, Research Institute of Chemical Defence, Beijing, 102205, China
| | - Hui-Lan Yu
- State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China.
- Laboratory of Analytical Chemistry, Research Institute of Chemical Defence, Beijing, 102205, China.
| | - Yang Yang
- State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China
- Laboratory of Analytical Chemistry, Research Institute of Chemical Defence, Beijing, 102205, China
| | - Fan-Hua Meng
- State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China
| | - Xian-Dong Dai
- State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China
| | - Pei-Yu Jiang
- State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China
- Laboratory of Analytical Chemistry, Research Institute of Chemical Defence, Beijing, 102205, China
| | - Chang-Cai Liu
- State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China.
- Laboratory of Analytical Chemistry, Research Institute of Chemical Defence, Beijing, 102205, China.
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Engel NY, Puffler N, Marchetti-Deschmann M, Allmaier G, Weiss VU. nES-DMA with Charge-reduction based on Soft X-ray Radiation: Analysis of a Recombinant Monoclonal Antibody. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1182:122925. [PMID: 34543886 DOI: 10.1016/j.jchromb.2021.122925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 08/05/2021] [Accepted: 09/01/2021] [Indexed: 11/22/2022]
Abstract
Due to the fast growing importance of monoclonal antibodies in biomedical research, bioanalytics and human therapy, sensitive, fast and reliable methods are needed to monitor their production, target their characteristics, and for their final quality control. Application of a nano electrospray (nES) with soft X-ray radiation (SXR) based charge reduction and differential mobility analysis (DMA, aka nano electrospray gas-phase electrophoretic mobility molecular analysis, nES GEMMA) allows the size-separation and detection of macromolecules and (bio-)nanoparticles from a few nm up to several hundreds of nm in diameter in a native-like environment. The current study focuses on the analysis of a 148 kDa recombinant monoclonal antibody (rmAb) with the above mentioned instrumental setup and applying an universal detector, i.e. a water-based condensation particle detector (CPC). Next to the intact rmAb, its aggregates and fragment products after digestion with IdeS protease were analyzed. Additionally, influence of temperature treatment and pH variation on the stability of the rmAb was monitored. In this context, changes in electrophoretic mobility diameter (EMD) values, peak shape, and signal intensity based on particle numbers were of interest. Molecular weights calculated by application of a correlation derived from respective standard protein compounds were compared to mass spectrometric values and were found to be in good accordance. To conclude, we demonstrate that nES-DMA is a valuable tool in the characterization and quality control of rmABs.
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Zhang D, Kinloch AJ, Srinath A, Shenkar R, Girard R, Lightle R, Moore T, Koskimäki J, Mohsin A, Carrión-Penagos J, Romanos S, Shen L, Clark MR, Shi C, Awad IA. Antibodies in cerebral cavernous malformations react with cytoskeleton autoantigens in the lesional milieu. J Autoimmun 2020; 113:102469. [PMID: 32362501 PMCID: PMC7483292 DOI: 10.1016/j.jaut.2020.102469] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 04/13/2020] [Accepted: 04/17/2020] [Indexed: 01/21/2023]
Abstract
Previous studies have reported robust inflammatory cell infiltration, synthesis of IgG, B-cell clonal expansion, deposition of immune complexes and complement within cerebral cavernous malformation (CCM) lesions. B-cell depletion has also been shown to reduce the maturation of CCM in murine models. We hypothesize that antigen(s) within the lesional milieu perpetuate the pathogenetic immune responses in CCMs. This study aims to identify those putative antigen(s) using monoclonal antibodies (mAbs) derived from plasma cells found in surgically removed human CCM lesions. We produced human mAbs from laser capture micro-dissected plasma cells from four CCM patients, and also germline-reverted versions. CCM mAbs were assayed using immunofluorescence on central nervous system (CNS) tissues and immunocytochemistry on human primary cell lines. Antigen characterization was performed using a combination of confocal microscopy, immunoprecipitation and mass spectrometry. Affinity was determined by enzyme-linked immunosorbent assay, and specificity by multi-color confocal microscopy and quantitative co-localization. CCM mAbs bound CNS tissue, especially endothelial cells and astrocytes. Non-muscle myosin heavy chain IIA (NMMHCIIA), vimentin and tubulin are three cytoskeleton proteins that were commonly targeted. Selection of cytoskeleton proteins by plasma cells was supported by a high frequency of immunoglobulin variable region somatic hypermutations, high affinity and selectivity of mAbs in their affinity matured forms, and profoundly reduced affinity and selectivity in the germline reverted forms. Antibodies produced by plasma cells in CCM lesions commonly target cytoplasmic and cytoskeletal autoantigens including NMMHCIIA, vimentin and tubulin that are abundant in endothelial cells and astrocytes. Binding to, and selection on autoantigen(s) in the lesional milieu likely perpetuates the pathogenetic immune response in CCMs. Blocking this in situ autoimmune response may yield a novel treatment for CCM.
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Affiliation(s)
- Dongdong Zhang
- Department of Neurosurgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, 150001, China; Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Andrew J Kinloch
- Department of Medicine, Section of Rheumatology, The University of Chicago, Gwen Knapp Center for Lupus and Immunology Research, 5841 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Abhinav Srinath
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Robert Shenkar
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Romuald Girard
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Rhonda Lightle
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Thomas Moore
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Janne Koskimäki
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Azam Mohsin
- Department of Medicine, Section of Rheumatology, The University of Chicago, Gwen Knapp Center for Lupus and Immunology Research, 5841 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Julián Carrión-Penagos
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Sharbel Romanos
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Le Shen
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Marcus R Clark
- Department of Medicine, Section of Rheumatology, The University of Chicago, Gwen Knapp Center for Lupus and Immunology Research, 5841 S. Maryland Ave, Chicago, IL, 60637, United States
| | - Changbin Shi
- Department of Neurosurgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, 150001, China
| | - Issam A Awad
- Neurovascular Surgery Program, Section of Neurosurgery, The University of Chicago Medicine and Biological Sciences, 5842 S. Maryland Ave, Chicago, IL, 60637, United States.
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Nowak C, Ponniah G, Neill A, Liu H. Characterization of succinimide stability during trypsin digestion for LC-MS analysis. Anal Biochem 2017; 526:1-8. [PMID: 28274724 DOI: 10.1016/j.ab.2017.03.005] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 03/02/2017] [Accepted: 03/03/2017] [Indexed: 12/13/2022]
Abstract
LC-MS peptide mapping is the most commonly used method to analyze protein modifications. The proteins are generally digested using trypsin at a slightly basic pH at 37 °C from several hours to overnight. Assay-induced artifacts can be generated during this procedure, potentially causing false-positive or false-negative results for a given modification. Unfortunately, for the analysis of succinimide, both false-negative and false-positive results can be generated within the same procedure. This study evaluates the stability of succinimide during the peptide mapping procedure and has demonstrated that up to 13% of pre-existing succinimide was lost during a 4 h trypsin digestion at pH 5.0 which was previously determined to be optimal for the detection of succinimide. The same procedure was able to simultaneously generate approximately 3% succinimide. Using the optimized procedure, it was also found that two aspartate residues that are followed by glycine residues in the conserved Fc region of a recombinant monoclonal antibody were not prone to isomerization. On the other hand, an aspartate residue followed by a glycine in the heavy chain variable domain was highly susceptible to isomerization. Interestingly, the antibody containing the succinimide eluted from an SEC column after the monomer peak.
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Affiliation(s)
- Christine Nowak
- Product Characterization, Alexion Pharmaceuticals, 100 College Street, New Haven, CT 06510, United States
| | - Gomathinayagam Ponniah
- Product Characterization, Alexion Pharmaceuticals, 100 College Street, New Haven, CT 06510, United States
| | - Alyssa Neill
- Product Characterization, Alexion Pharmaceuticals, 100 College Street, New Haven, CT 06510, United States
| | - Hongcheng Liu
- Product Characterization, Alexion Pharmaceuticals, 100 College Street, New Haven, CT 06510, United States.
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Nowak C, Ponniah G, Cheng G, Kita A, Neill A, Kori Y, Liu H. Liquid chromatography-fluorescence and liquid chromatography-mass spectrometry detection of tryptophan degradation products of a recombinant monoclonal antibody. Anal Biochem 2016; 496:4-8. [PMID: 26717898 DOI: 10.1016/j.ab.2015.12.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 12/01/2015] [Accepted: 12/09/2015] [Indexed: 12/19/2022]
Abstract
Light exposure is one of several conditions used to study the degradation pathways of recombinant monoclonal antibodies. Tryptophan is of particular interest among the 20 amino acids because it is the most photosensitive. Tryptophan degradation forms several products, including an even stronger photosensitizer and several reactive oxygen species. The current study reports a specific peptide mapping procedure to monitor tryptophan degradation. Instead of monitoring peptides using UV 214 nm, fluorescence detection with an excitation wavelength of 295 nm and an emission wavelength of 350 nm was used to enable specific detection of tryptophan-containing peptides. Peaks that decreased in area over time are likely to contain susceptible tryptophan residues. This observation can allow further liquid chromatography-mass spectrometry (LC-MS) analysis to focus only on those peaks to confirm tryptophan degradation products. After confirmation of tryptophan degradation, susceptibility of tryptophan residues can be compared based on the peak area decrease.
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