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Fan H, Zhao L, Wang W, Yu F, Jing H, Yang Y, Zhang X, Zhao Z, Gou Q, Zhang W, Zou Q, Zhang J, Zeng H. A highly neutralizing human monoclonal antibody targeting a novel linear epitope on staphylococcal enterotoxin B. Hum Vaccin Immunother 2024; 20:2360338. [PMID: 38857905 PMCID: PMC11182437 DOI: 10.1080/21645515.2024.2360338] [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: 02/11/2024] [Accepted: 05/23/2024] [Indexed: 06/12/2024] Open
Abstract
Staphylococcal Enterotoxin B (SEB), produced by Staphylococcus aureus (S. aureus), is a powerful superantigen that induces severe immune disruption and toxic shock syndrome (TSS) upon binding to MHC-II and TCR. Despite its significant impact on the pathogenesis of S. aureus, there are currently no specific therapeutic interventions available to counteract the mechanism of action exerted by this toxin. In this study, we have identified a human monoclonal antibody, named Hm0487, that specifically targets SEB by single-cell sequencing using PBMCs isolated from volunteers enrolled in a phase I clinical trial of the five-antigen S. aureus vaccine. X-ray crystallography studies revealed that Hm0487 exhibits high affinity for a linear B cell epitope in SEB (SEB138-147), which is located distantly from the site involved in the formation of the MHC-SEB-TCR ternary complex. Furthermore, in vitro studies demonstrated that Hm0487 significantly impacts the interaction of SEB with both receptors and the binding to immune cells, probably due to an allosteric effect on SEB rather than competing with receptors for binding sites. Moreover, both in vitro and in vivo studies validated that Hm0487 displayed efficient neutralizing efficacy in models of lethal shock and sepsis induced by either SEB or bacterial challenge. Our findings unveil an alternative mechanism for neutralizing the pathogenesis of SEB by Hm0487, and this antibody provides a novel strategy for mitigating both SEB-induced toxicity and S. aureus infection.
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Affiliation(s)
- Hongyin Fan
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Liqun Zhao
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Weiwei Wang
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, P.R. China
| | - Feng Yu
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, P.R. China
| | - Haiming Jing
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Yun Yang
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Xiaoli Zhang
- Department of Clinical Hematology, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Zhuo Zhao
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Qiang Gou
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Weijun Zhang
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Quanming Zou
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Jinyong Zhang
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
| | - Hao Zeng
- National Engineering Research Center of Immunological Products, Department of Microbiology and Biochemical Pharmacy, College of Pharmacy, Army Medical University, Chongqing, PR China
- State Key Laboratory of Trauma and Chemical Poisoning, Army Medical University, Chongqing, P.R. China
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2
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Yu YA, Lien WJ, Lin WC, Pan YC, Huang SW, Mou CY, Hu CMJ, Mou KY. High-Affinity Superantigen-Based Trifunctional Immune Cell Engager Synergizes NK and T Cell Activation for Tumor Suppression. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2310204. [PMID: 38937984 DOI: 10.1002/advs.202310204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Revised: 06/14/2024] [Indexed: 06/29/2024]
Abstract
The development of immune cell engagers (ICEs) can be limited by logistical and functional restrictions associated with fusion protein designs, thus limiting immune cell recruitment to solid tumors. Herein, a high affinity superantigen-based multivalent ICE is developed for simultaneous activation and recruitment of NK and T cells for tumor treatment. Yeast library-based directed evolution is adopted to identify superantigen variants possessing enhanced binding affinity to immunoreceptors expressed on human T cells and NK cells. High-affinity superantigens exhibiting improved immune-stimulatory activities are then incorporated into a superantigen-based tri-functional yeast-display-enhanced multivalent immune cell engager (STYMIE), which is functionalized with a nanobody, a Neo-2/15 cytokine, and an Fc domain for tumor targeting, immune stimulation, and prolonged circulation, respectively. Intravenous administration of STYMIE enhances NK and T cell recruitment into solid tumors, leading to enhanced inhibition in multiple tumor models. The study offers design principles for multifunctional ICEs.
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Affiliation(s)
- Yao-An Yu
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
- Doctoral Degree Program of Translational Medicine, National Yang Ming Chiao Tung University and Academia Sinica, Taipei, 112, Taiwan
| | - Wan-Ju Lien
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Wen-Ching Lin
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Yi-Chung Pan
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Sin-Wei Huang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Chung-Yuan Mou
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Che-Ming Jack Hu
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
- Doctoral Degree Program of Translational Medicine, National Yang Ming Chiao Tung University and Academia Sinica, Taipei, 112, Taiwan
- Biomedical Translation Research Center, Academia Sinica, Taipei, 11529, Taiwan
| | - Kurt Yun Mou
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
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3
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Arunachalam AB. Vaccines Induce Homeostatic Immunity, Generating Several Secondary Benefits. Vaccines (Basel) 2024; 12:396. [PMID: 38675778 PMCID: PMC11053716 DOI: 10.3390/vaccines12040396] [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: 02/27/2024] [Revised: 03/28/2024] [Accepted: 04/08/2024] [Indexed: 04/28/2024] Open
Abstract
The optimal immune response eliminates invading pathogens, restoring immune equilibrium without inflicting undue harm to the host. However, when a cascade of immunological reactions is triggered, the immune response can sometimes go into overdrive, potentially leading to harmful long-term effects or even death. The immune system is triggered mostly by infections, allergens, or medical interventions such as vaccination. This review examines how these immune triggers differ and why certain infections may dysregulate immune homeostasis, leading to inflammatory or allergic pathology and exacerbation of pre-existing conditions. However, many vaccines generate an optimal immune response and protect against the consequences of pathogen-induced immunological aggressiveness, and from a small number of unrelated pathogens and autoimmune diseases. Here, we propose an "immuno-wave" model describing a vaccine-induced "Goldilocks immunity", which leaves fine imprints of both pro-inflammatory and anti-inflammatory milieus, derived from both the innate and the adaptive arms of the immune system, in the body. The resulting balanced, 'quiet alert' state of the immune system may provide a jump-start in the defense against pathogens and any associated pathological inflammatory or allergic responses, allowing vaccines to go above and beyond their call of duty. In closing, we recommend formally investigating and reaping many of the secondary benefits of vaccines with appropriate clinical studies.
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Affiliation(s)
- Arun B Arunachalam
- Analytical Sciences, R&D Sanofi Vaccines, 1 Discovery Dr., Swiftwater, PA 18370, USA
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4
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Zhao XC, Ju B, Xiu NN, Sun XY, Meng FJ. When inflammatory stressors dramatically change, disease phenotypes may transform between autoimmune hematopoietic failure and myeloid neoplasms. Front Immunol 2024; 15:1339971. [PMID: 38426096 PMCID: PMC10902444 DOI: 10.3389/fimmu.2024.1339971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 01/24/2024] [Indexed: 03/02/2024] Open
Abstract
Aplastic anemia (AA) and hypoplastic myelodysplastic syndrome are paradigms of autoimmune hematopoietic failure (AHF). Myelodysplastic syndrome and acute myeloid leukemia are unequivocal myeloid neoplasms (MNs). Currently, AA is also known to be a clonal hematological disease. Genetic aberrations typically observed in MNs are detected in approximately one-third of AA patients. In AA patients harboring MN-related genetic aberrations, a poor response to immunosuppressive therapy (IST) and an increased risk of transformation to MNs occurring either naturally or after IST are predicted. Approximately 10%-15% of patients with severe AA transform the disease phenotype to MNs following IST, and in some patients, leukemic transformation emerges during or shortly after IST. Phenotypic transformations between AHF and MNs can occur reciprocally. A fraction of advanced MN patients experience an aplastic crisis during which leukemic blasts are repressed. The switch that shapes the disease phenotype is a change in the strength of extramedullary inflammation. Both AHF and MNs have an immune-active bone marrow (BM) environment (BME). In AHF patients, an inflamed BME can be evoked by infiltrated immune cells targeting neoplastic molecules, which contributes to the BM-specific autoimmune impairment. Autoimmune responses in AHF may represent an antileukemic mechanism, and inflammatory stressors strengthen antileukemic immunity, at least in a significant proportion of patients who have MN-related genetic aberrations. During active inflammatory episodes, normal and leukemic hematopoieses are suppressed, which leads to the occurrence of aplastic cytopenia and leukemic cell regression. The successful treatment of underlying infections mitigates inflammatory stress-related antileukemic activities and promotes the penetration of leukemic hematopoiesis. The effect of IST is similar to that of treating underlying infections. Investigating inflammatory stress-powered antileukemic immunity is highly important in theoretical studies and clinical practice, especially given the wide application of immune-activating agents and immune checkpoint inhibitors in the treatment of hematological neoplasms.
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Affiliation(s)
- Xi-Chen Zhao
- Department of Hematology, The Central Hospital of Qingdao West Coast New Area, Qingdao, Shandong, China
| | - Bo Ju
- Department of Hematology, The Central Hospital of Qingdao West Coast New Area, Qingdao, Shandong, China
| | - Nuan-Nuan Xiu
- Department of Hematology, The Central Hospital of Qingdao West Coast New Area, Qingdao, Shandong, China
| | - Xiao-Yun Sun
- Department of Hematology, The Central Hospital of Qingdao West Coast New Area, Qingdao, Shandong, China
| | - Fan-Jun Meng
- Department of Hematology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
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Ming K, Xing B, Hu Y, Mei M, Huang W, Hu X, Wei Z. De novo design of a protein binder against Staphylococcus enterotoxin B. Int J Biol Macromol 2024; 257:128666. [PMID: 38070805 DOI: 10.1016/j.ijbiomac.2023.128666] [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: 10/09/2023] [Revised: 12/03/2023] [Accepted: 12/06/2023] [Indexed: 01/26/2024]
Abstract
Staphylococcus enterotoxin B (SEB) interacts with MHC-II molecules to overactivate immune cells and thereby to produce excessive pro-inflammatory cytokines. Disrupting the interactions between SEB and MHC-II helps eliminate the lethal threat posed by SEB. In this study, a de novo computational approach was used to design protein binders targeting SEB. The MHC-II binding domain of SEB was selected as the target, and the possible promising binding mode was broadly explored. The obtained original binder was folded into triple-helix bundles and contained 56 amino acids with molecular weight 5.9 kDa. The interface of SEB and the binder was highly hydrophobic. ProteinMPNN optimization further enlarged the hydrophobic region of the binder and improved the stability of the binder-SEB complex. In vitro study demonstrated that the optimized binder significantly inhibited the inflammatory response induced by SEB. Overall, our research demonstrated the applicability of this approach in de novo designing protein binders against SEB, and thereby providing potential therapeutics for SEB induced diseases.
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Affiliation(s)
- Ke Ming
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China; Hubei Jiangxia Laboratory, Wuhan, Hubei, PR China
| | - Banbin Xing
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Yang Hu
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Meng Mei
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Wenli Huang
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Xiaoyu Hu
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Zigong Wei
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China; Hubei Jiangxia Laboratory, Wuhan, Hubei, PR China; Hubei Province Key Laboratory of Biotechnology of Chinese Traditional Medicine, National & Local Joint Engineering Research Center of High-throughput Drug Screening Technology, School of life sciences, Hubei University, Wuhan, Hubei, PR China.
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6
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Du H, Liu J, Jude KM, Yang X, Li Y, Bell B, Yang H, Kassardjian A, Mobedi A, Parekh U, Sperberg RAP, Julien JP, Mellins ED, Garcia KC, Huang PS. A general platform for targeting MHC-II antigens via a single loop. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.26.577489. [PMID: 38352315 PMCID: PMC10862749 DOI: 10.1101/2024.01.26.577489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/21/2024]
Abstract
Class-II major histocompatibility complexes (MHC-IIs) are central to the communications between CD4+ T cells and antigen presenting cells (APCs), but intrinsic structural features associated with MHC-II make it difficult to develop a general targeting system with high affinity and antigen specificity. Here, we introduce a protein platform, Targeted Recognition of Antigen-MHC Complex Reporter for MHC-II (TRACeR-II), to enable the rapid development of peptide-specific MHC-II binders. TRACeR-II has a small helical bundle scaffold and uses an unconventional mechanism to recognize antigens via a single loop. This unique antigen-recognition mechanism renders this platform highly versatile and amenable to direct structural modeling of the interactions with the antigen. We demonstrate that TRACeR-II binders can be rapidly evolved across multiple alleles, while computational protein design can produce specific binding sequences for a SARS-CoV-2 peptide of unknown complex structure. TRACeR-II sheds light on a simple and straightforward approach to address the MHC peptide targeting challenge, without relying on combinatorial selection on complementarity determining region (CDR) loops. It presents a promising basis for further exploration in immune response modulation as well as a broad range of theragnostic applications.
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Affiliation(s)
- Haotian Du
- Department of Chemistry, Stanford University, Stanford, CA, USA
| | - Jingjia Liu
- Department of Bioengineering, Stanford University, CA, USA
| | - Kevin M. Jude
- Departments of Molecular and Cellular Physiology and Structural Biology, Stanford University School of Medicine, Stanford, CA, USA
| | - Xinbo Yang
- Departments of Molecular and Cellular Physiology and Structural Biology, Stanford University School of Medicine, Stanford, CA, USA
| | - Ying Li
- Department of Pediatrics, Divisions of Human Gene Therapy and Allergy, Immunology & Rheumatology, Stanford University School of Medicine, Stanford, CA, USA
- Stanford Program in Immunology, Stanford University School of Medicine, Stanford, CA, USA
| | - Braxton Bell
- Department of Chemistry, Stanford University, Stanford, CA, USA
| | - Hongli Yang
- Department of Bioengineering, Stanford University, CA, USA
| | - Audrey Kassardjian
- Program in Molecular Medicine, The Hospital for Sick Children Research Institute, Toronto, ON M5G 0A4, Canada
- Department of Immunology, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Ali Mobedi
- Department of Bioengineering, Stanford University, CA, USA
| | - Udit Parekh
- Department of Bioengineering, Stanford University, CA, USA
| | | | - Jean-Philippe Julien
- Program in Molecular Medicine, The Hospital for Sick Children Research Institute, Toronto, ON M5G 0A4, Canada
- Department of Immunology, University of Toronto, Toronto, ON M5S 1A8, Canada
- Department of Biochemistry, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Elizabeth D. Mellins
- Department of Pediatrics, Divisions of Human Gene Therapy and Allergy, Immunology & Rheumatology, Stanford University School of Medicine, Stanford, CA, USA
- Stanford Program in Immunology, Stanford University School of Medicine, Stanford, CA, USA
| | - K. Christopher Garcia
- Departments of Molecular and Cellular Physiology and Structural Biology, Stanford University School of Medicine, Stanford, CA, USA
- Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Po-Ssu Huang
- Department of Bioengineering, Stanford University, CA, USA
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7
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Vecchio E, Rotundo S, Veneziano C, Abatino A, Aversa I, Gallo R, Giordano C, Serapide F, Fusco P, Viglietto G, Cuda G, Costanzo F, Russo A, Trecarichi EM, Torti C, Palmieri C. The spike-specific TCRβ repertoire shows distinct features in unvaccinated or vaccinated patients with SARS-CoV-2 infection. J Transl Med 2024; 22:33. [PMID: 38185632 PMCID: PMC10771664 DOI: 10.1186/s12967-024-04852-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Accepted: 01/02/2024] [Indexed: 01/09/2024] Open
Abstract
BACKGROUND The evolving variants of SARS-CoV-2 may escape immunity from prior infections or vaccinations. It's vital to understand how immunity adapts to these changes. Both infection and mRNA vaccination induce T cells that target the Spike protein. These T cells can recognize multiple variants, such as Delta and Omicron, even if neutralizing antibodies are weakened. However, the degree of recognition can vary among people, affecting vaccine efficacy. Previous studies demonstrated the capability of T-cell receptor (TCR) repertoire analysis to identify conserved and immunodominant peptides with cross-reactive potential among variant of concerns. However, there is a need to extend the analysis of the TCR repertoire to different clinical scenarios. The aim of this study was to examine the Spike-specific TCR repertoire profiles in natural infections and those with combined natural and vaccine immunity. METHODS A T-cell enrichment approach and bioinformatic tools were used to investigate the Spike-specific TCRβ repertoire in peripheral blood mononuclear cells of previously vaccinated (n = 8) or unvaccinated (n = 6) COVID-19 patients. RESULTS Diversity and clonality of the TCRβ repertoire showed no significant differences between vaccinated and unvaccinated groups. When comparing the TCRβ data to public databases, 692 unique TCRβ sequences linked to S epitopes were found in the vaccinated group and 670 in the unvaccinated group. TCRβ clonotypes related to spike regions S135-177, S264-276, S319-350, and S448-472 appear notably more prevalent in the vaccinated group. In contrast, the S673-699 epitope, believed to have super antigenic properties, is observed more frequently in the unvaccinated group. In-silico analyses suggest that mutations in epitopes, relative to the main SARS-CoV-2 variants of concern, don't hinder their cross-reactive recognition by associated TCRβ clonotypes. CONCLUSIONS Our findings reveal distinct TCRβ signatures in vaccinated and unvaccinated individuals with COVID-19. These differences might be associated with disease severity and could influence clinical outcomes. TRIAL REGISTRATION FESR/FSE 2014-2020 DDRC n. 585, Action 10.5.12, noCOVID19@UMG.
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Affiliation(s)
- Eleonora Vecchio
- Department of Experimental and Clinical Medicine, University "Magna Graecia", Viale Europa, 88100, Catanzaro, Italy
- Interdepartmental Centre of Services, University "Magna Graecia", 88100, Catanzaro, Italy
| | - Salvatore Rotundo
- Department of Medical and Surgical Sciences, Chair of Infectious and Tropical Diseases, University "Magna Graecia", 88100, Catanzaro, Italy
| | - Claudia Veneziano
- Interdepartmental Centre of Services, University "Magna Graecia", 88100, Catanzaro, Italy
| | - Antonio Abatino
- Department of Experimental and Clinical Medicine, University "Magna Graecia", Viale Europa, 88100, Catanzaro, Italy
| | - Ilenia Aversa
- Department of Experimental and Clinical Medicine, University "Magna Graecia", Viale Europa, 88100, Catanzaro, Italy
| | - Raffaella Gallo
- Department of Experimental and Clinical Medicine, University "Magna Graecia", Viale Europa, 88100, Catanzaro, Italy
| | - Caterina Giordano
- Department of Experimental and Clinical Medicine, University "Magna Graecia", Viale Europa, 88100, Catanzaro, Italy
| | - Francesca Serapide
- Department of Medical and Surgical Sciences, Chair of Infectious and Tropical Diseases, University "Magna Graecia", 88100, Catanzaro, Italy
| | - Paolo Fusco
- Department of Medical and Surgical Sciences, Chair of Infectious and Tropical Diseases, University "Magna Graecia", 88100, Catanzaro, Italy
| | - Giuseppe Viglietto
- Department of Experimental and Clinical Medicine, University "Magna Graecia", Viale Europa, 88100, Catanzaro, Italy
| | - Giovanni Cuda
- Department of Experimental and Clinical Medicine, University "Magna Graecia", Viale Europa, 88100, Catanzaro, Italy
| | - Francesco Costanzo
- Department of Experimental and Clinical Medicine, University "Magna Graecia", Viale Europa, 88100, Catanzaro, Italy
- Interdepartmental Centre of Services, University "Magna Graecia", 88100, Catanzaro, Italy
| | - Alessandro Russo
- Department of Medical and Surgical Sciences, Chair of Infectious and Tropical Diseases, University "Magna Graecia", 88100, Catanzaro, Italy
| | - Enrico Maria Trecarichi
- Department of Medical and Surgical Sciences, Chair of Infectious and Tropical Diseases, University "Magna Graecia", 88100, Catanzaro, Italy
| | - Carlo Torti
- Department of Medical and Surgical Sciences, Chair of Infectious and Tropical Diseases, University "Magna Graecia", 88100, Catanzaro, Italy
| | - Camillo Palmieri
- Department of Experimental and Clinical Medicine, University "Magna Graecia", Viale Europa, 88100, Catanzaro, Italy.
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8
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Ming K, Hu Y, Zhu M, Xing B, Mei M, Wei Z. Development of nanobodies against Staphylococcus enterotoxin B through yeast surface display. Int J Biol Macromol 2023; 253:126822. [PMID: 37703983 DOI: 10.1016/j.ijbiomac.2023.126822] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 09/06/2023] [Accepted: 09/07/2023] [Indexed: 09/15/2023]
Abstract
Staphylococcus enterotoxin B (SEB) is one of the primary virulence factors of Staphylococcus aureus but there is still a lack of targeted drugs. SEB activates immune cells via interacting with MHC-II on antigen-presenting cells, leading to the production of large amounts of pro-inflammatory cytokines. Blocking the interaction between SEB and MHC-II can avert the overactivation of immune cells. Nanobodies are the smallest functional antibodies that can bind stably to antigens. In this study, an ideal approach to obtain specific nanobodies without immunizing camelids was introduced. We constructed a library containing up to 5 × 108 nanobodies, and then screened those targeting SEB by using yeast surface display (YSD) technique and fluorescence-activated cell sorting (FACS). A total of 8 nanobodies with divergent complementarity-determining regions (CDRs) sequences were identified and one candidate Nb8 with high affinity to SEB was isolated. In vitro study demonstrated that Nb8 significantly inhibited SEB-induced inflammatory response. Molecular docking simulation indicated that the unique CDR3 sequence contributed to the binding of Nb8 to the MHC-II binding domain of SEB and accordingly cut off the connection between SEB and MHC-II. Our efforts contributed to the development of specific nanobodies for eliminating the threats of SEB.
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Affiliation(s)
- Ke Ming
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Yang Hu
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Meijun Zhu
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Banbin Xing
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Meng Mei
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China
| | - Zigong Wei
- School of life sciences, Hubei University, Wuhan, Hubei, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, Hubei, PR China; National & Local Joint Engineering Research Center of High-throughput Drug Screening Technology, School of life sciences, Hubei University, Wuhan, Hubei, PR China.
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9
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Starikova EA, Mammedova JT, Ozhiganova A, Leveshko TA, Lebedeva AM, Sokolov AV, Isakov DV, Karaseva AB, Burova LA, Kudryavtsev IV. Streptococcal Arginine Deiminase Inhibits T Lymphocyte Differentiation In Vitro. Microorganisms 2023; 11:2585. [PMID: 37894243 PMCID: PMC10608802 DOI: 10.3390/microorganisms11102585] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 10/13/2023] [Accepted: 10/18/2023] [Indexed: 10/29/2023] Open
Abstract
Pathogenic microbes use arginine-metabolizing enzymes as an immune evasion strategy. In this study, the impact of streptococcal arginine deiminase (ADI) on the human peripheral blood T lymphocytes function in vitro was studied. The comparison of the effects of parental strain (Streptococcus pyogenes M49-16) with wild type of ArcA gene and its isogenic mutant with inactivated ArcA gene (Streptococcus pyogenes M49-16delArcA) was carried out. It was found that ADI in parental strain SDSC composition resulted in a fivefold decrease in the arginine concentration in human peripheral blood mononuclear cell (PBMC) supernatants. Only parental strain SDSCs suppressed anti-CD2/CD3/CD28-bead-stimulated mitochondrial dehydrogenase activity and caused a twofold decrease in IL-2 production in PBMC. Flow cytometry analysis revealed that ADI decreased the percentage of CM (central memory) and increased the proportion of TEMRA (terminally differentiated effector memory) of CD4+ and CD8+ T cells subsets. Enzyme activity inhibited the proliferation of all CD8+ T cell subsets as well as CM, EM (effector memory), and TEMRA CD4+ T cells. One of the prominent ADI effects was the inhibition of autophagy processes in CD8+ CM and EM as well as CD4+ CM, EM, and TEMRA T cell subsets. The data obtained confirm arginine's crucial role in controlling immune reactions and suggest that streptococcal ADI may downregulate adaptive immunity and immunological memory.
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Affiliation(s)
- Eleonora A. Starikova
- Laboratory of Cellular Immunology, Department of Immunology, Institute of Experimental Medicine, 197022 St. Petersburg, Russia
- Medical Faculty, First Saint Petersburg State I. Pavlov Medical University, 197022 St. Petersburg, Russia
| | - Jennet T. Mammedova
- Laboratory of General Immunology, Department of Immunology, Institute of Experimental Medicine, 197022 St. Petersburg, Russia
| | - Arina Ozhiganova
- Laboratory of Cellular Immunology, Department of Immunology, Institute of Experimental Medicine, 197022 St. Petersburg, Russia
| | - Tatiana A. Leveshko
- Laboratory of Cellular Immunology, Department of Immunology, Institute of Experimental Medicine, 197022 St. Petersburg, Russia
| | - Aleksandra M. Lebedeva
- Laboratory of Cellular Immunology, Department of Immunology, Institute of Experimental Medicine, 197022 St. Petersburg, Russia
| | - Alexey V. Sokolov
- Laboratory of Biochemical Genetics, Department of Molecular Genetics, Institute of Experimental Medicine, 197022 St. Petersburg, Russia;
| | - Dmitry V. Isakov
- Medical Faculty, First Saint Petersburg State I. Pavlov Medical University, 197022 St. Petersburg, Russia
| | - Alena B. Karaseva
- Laboratory of Molecular Genetics of Pathogenic Microorganisms, Department of Molecular Microbiology, Institute of Experimental Medicine, 197022 St. Petersburg, Russia
| | - Larissa A. Burova
- Laboratory of Biomedical Microecology, Department of Molecular Microbiology, Institute of Experimental Medicine, 197022 St. Petersburg, Russia;
| | - Igor V. Kudryavtsev
- Laboratory of Cellular Immunology, Department of Immunology, Institute of Experimental Medicine, 197022 St. Petersburg, Russia
- Medical Faculty, First Saint Petersburg State I. Pavlov Medical University, 197022 St. Petersburg, Russia
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10
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Deacy AM, Gan SKE. The influence of variable-heavy chain families on IgG 2, 3, 4, FcγRs and B-cell superantigens protein G and L binding using biolayer interferometry. Antib Ther 2023; 6:182-193. [PMID: 37680351 PMCID: PMC10481891 DOI: 10.1093/abt/tbad016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 06/16/2023] [Accepted: 06/28/2023] [Indexed: 09/09/2023] Open
Abstract
As the most abundant immunoglobulin in blood and the most common human isotype used for therapeutic monoclonal antibodies, the engagement and activation of its Fc receptors by IgGs are crucial for antibody function. Assumed to be relatively constant within subtypes, recent studies reveal that antibody variable regions exert distal effects of modulating antibody-receptor interactions on antibody isotypes. These variable (V)-region distal effects are also expected for the IgG subtypes. With an in-depth understanding of the V-region effects, researchers can make a more informed antibody engineering approach and antibody purification strategy accounting for the functions of microbial immune evasion . In this study, we created a panel of IgG2/IgG3/IgG4 antibodies by changing the VH family (VH1-7) frameworks while retaining the complementary determining regions of pertumuzab and measured their interactions with FcγRIa, FcγRIIaH167, FcγRIIaR167, FcγRIIb/c, FcγRIIIaF176, FcγRIIIaV176, FcγRIIIbNA1 and FcγRIIIbNA2 receptors alongside B-cell superantigens Protein L and G using biolayer interferometry. The panel of 21 IgGs demonstrated that the VH frameworks influenced receptor binding sites on the constant region in a non-canonical manner. However, there was minimal influence on the binding of bacterial B-cell superantigens Proteins L and Protein G on the IgGs, showing their robustness against V-region effects. These results demonstrate the role of V-regions during the humanization of therapeutic antibodies that can influence FcR-dependent immune responses while retaining binding by bacterial B-cell superantigens for antibody purification. These in vitro measurements provide a clue to detailed antibody engineering and understanding of antibody superantigen functions that would be relevant with in vivo validation.
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Affiliation(s)
- Anthony M Deacy
- Antibody& Product Development Lab, Agency for Science, Technology and Research (ASTAR), Singapore, and Wenzhou-Kean University, Wenzhou, Zhejiang, China
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Samuel Ken-En Gan
- Antibody& Product Development Lab, Agency for Science, Technology and Research (ASTAR), Singapore, and Wenzhou-Kean University, Wenzhou, Zhejiang, China
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
- Zhejiang Bioinformatics International Science and Technology Cooperation Centre, Wenzhou-Kean University, Wenzhou, Zhejiang Province, China
- Wenzhou Municipal Key Lab of Applied Biomedical and Biopharmaceutical Informatics, Wenzhou-Kean University, Wenzhou, Zhejiang Province, China
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11
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Duarte A, Montagna DR, Pastorini M, Alemán M. Apoptosis-mediated inhibition of human T-cell acute lymphoblastic leukemia upon treatment with Staphylococus Aureus enterotoxin-superantigen. Front Immunol 2023; 14:1176432. [PMID: 37377961 PMCID: PMC10291079 DOI: 10.3389/fimmu.2023.1176432] [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: 02/28/2023] [Accepted: 05/24/2023] [Indexed: 06/29/2023] Open
Abstract
Patients with relapsed T cell acute lymphoblastic leukemia (T-ALL) have limited therapeutic options and poor prognosis. The finding of efficient strategies against this refractory neoplasm is a medical priority. Superantigens (SAgs) are viral and bacterial proteins that bind to major histocompatibility complex class II molecules as unprocessed proteins and subsequently interact with a high number of T cells expressing particular T cell receptor Vβ chains. Although on mature T cells, SAgs usually trigger massive cell proliferation producing deleterious effects on the organism, in contrast, on immature T cells, they may trigger their death by apoptosis. On this basis, it was hypothesized that SAgs could also induce apoptosis in neoplastic T cells that are usually immature cells that probably conserve their particular Vβ chains. In this work, we investigated the effect of the SAg Staphylococcus aureus enterotoxin E (SEE) (that specifically interacts with cells that express Vβ8 chain), on human Jurkat T- leukemia line, that expresses Vβ8 in its T receptor and it is a model of the highly aggressive recurrent T-ALL. Our results demonstrated that SEE could induce apoptosis in Jurkat cells in vitro. The induction of apoptosis was specific, correlated to the down regulation of surface Vβ8 TCR expression and was triggered, at least in part, through the Fas/FasL extrinsic pathway. The apoptotic effect induced by SEE on Jurkat cells was therapeutically relevant. In effect, upon transplantation of Jurkat cells in the highly immunodeficient NSG mice, SEE treatment reduced dramatically tumor growth, decreased the infiltration of neoplastic cells in the bloodstream, spleen and lymph nodes and, most importantly, increased significantly the survival of mice. Taken together, these results raise the possibility that this strategy can be, in the future, a useful option for the treatment of recurrent T-ALL.
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Affiliation(s)
- Alejandra Duarte
- Institute of Experimental Medicine, National Council of Scientific and Technical Research, National Medicine Academy (IMEX-CONICET-ANM), Buenos Aires, Argentina
- Fundación Héctor Alejandro (H.A.) Barceló, Instituto Universitario de Ciencias de la Salud, Buenos Aires, Argentina
| | - Daniela R. Montagna
- Institute of Experimental Medicine, National Council of Scientific and Technical Research, National Medicine Academy (IMEX-CONICET-ANM), Buenos Aires, Argentina
| | - Mercedes Pastorini
- Institute of Experimental Medicine, National Council of Scientific and Technical Research, National Medicine Academy (IMEX-CONICET-ANM), Buenos Aires, Argentina
| | - Mercedes Alemán
- Institute of Experimental Medicine, National Council of Scientific and Technical Research, National Medicine Academy (IMEX-CONICET-ANM), Buenos Aires, Argentina
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12
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Johnson WL, Sohn M, Woeller CF, Wozniak RAF. Staphylococcal Enterotoxins Promote Virulence in Bacterial Keratitis. Invest Ophthalmol Vis Sci 2023; 64:5. [PMID: 37133835 PMCID: PMC10166116 DOI: 10.1167/iovs.64.5.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023] Open
Abstract
Purpose Staphylococcus aureus is an important cause of corneal infections (keratitis). To better understand the virulence mechanisms mediating keratitis, a recent comparative genomics study revealed that a set of secreted enterotoxins were found with higher prevalence among ocular versus non-ocular S. aureus clinical infection isolates, suggesting a key role for these toxins in keratitis. Although well known to cause toxic shock syndrome and S. aureus food poisoning, enterotoxins have not yet been shown to mediate virulence in keratitis. Methods A set of clinical isolate test strains, including a keratitis isolate that encodes five enterotoxins (sed, sej, sek, seq, ser), its corresponding enterotoxin deletion mutant and complementation strain, a keratitis isolate devoid of enterotoxins, and the non-ocular S. aureus strain USA300 along with its corresponding enterotoxin deletion and complementation strains, were evaluated for cellular adhesion, invasion and cytotoxicity in a primary corneal epithelial model as well as with microscopy. Additionally, strains were evaluated in an in vivo model of keratitis to quantify enterotoxin gene expression and measure disease severity. Results We demonstrate that, although enterotoxins do not impact bacterial adhesion or invasion, they do elicit direct cytotoxicity in vitro toward corneal epithelial cells. In an in vivo model, sed, sej, sek, seq, ser were found to have variable gene expression across 72 hours of infection and test strains encoding enterotoxins resulted in increased bacterial burden as well as a reduced host cytokine response. Conclusions Our results support a novel role for staphylococcal enterotoxins in promoting virulence in S. aureus keratitis.
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Affiliation(s)
- William L Johnson
- Department of Ophthalmology, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States
| | - Michael Sohn
- Department of Biostatistics and Computational Biology, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States
| | - Collynn F Woeller
- Department of Ophthalmology, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States
| | - Rachel A F Wozniak
- Department of Ophthalmology, University of Rochester School of Medicine and Dentistry, Rochester, New York, United States
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13
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Chavez-Galan L, Ruiz A, Ramón-Luing LA, Escamilla-Gutiérrez A, Sánchez-Monciváis A, Tecuatzi-Cadena B, Medina-Quero K, Córdova-Espinoza MG. The SEB1741 Aptamer Is an Efficient Tool for Blocking CD4+ T Cell Activation Induced by Staphylococcal Enterotoxin B. Molecules 2023; 28:molecules28083480. [PMID: 37110712 PMCID: PMC10142257 DOI: 10.3390/molecules28083480] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 04/01/2023] [Accepted: 04/11/2023] [Indexed: 04/29/2023] Open
Abstract
Staphylococcal enterotoxin B (SEB) is a protein produced by Staphylococcus aureus, which is toxic to humans. It is well known for its ability to stimulate the exacerbated activation of proinflammatory CD4+ T cells (Th1 profile), and in vitro studies have been conducted to understand its mechanism of action and its potential use as an immune therapy. However, the efficiency of the SEB1741 aptamer in blocking SEB has not been experimentally demonstrated. METHODS Enrichment CD4+ T cells were stimulated with SEB, and as a blocker, we used the SEB1741 aptamer, which was previously synthesised by an "in silico" analysis, showing high affinity and specificity to SEB. The efficiency of the SEB1741 aptamer in blocking CD4+ T cell activation was compared with that of an anti-SEB monoclonal antibody. Flow cytometry and Bio-Plex were used to evaluate the T-cell function. RESULTS In vitro, SEB induced the activation of CD4+ T cells and favoured a Th1 profile; however, the SEB1741 aptamer was highly efficient in decreasing the frequency of CD4+ T cells positive to ki-67 and CD69 cells, this means that proliferation and activation of CD4+ T cells was decreased. Moreover, the production of interleukin 2 (IL-2) and interferon-gamma (IFN-γ) was affected, suggesting that the Th1 profile is not present when the SEB1441 aptamer is used. Thus, the SEB1741 function was similar to that of anti-SEB. CONCLUSIONS The SEB1741 aptamer is a valuable tool for blocking CD4+ T cell activation and the subsequent release of proinflammatory cytokines by SEB stimulation.
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Affiliation(s)
- Leslie Chavez-Galan
- Laboratory of Integrative Immunology, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Mexico City 14080, Mexico
| | - Andy Ruiz
- Laboratory of Integrative Immunology, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Mexico City 14080, Mexico
| | - Lucero A Ramón-Luing
- Laboratory of Integrative Immunology, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Mexico City 14080, Mexico
| | - Alejandro Escamilla-Gutiérrez
- Laboratory of Medical Bacteriology, Department of Microbiology, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City 11350, Mexico
- Hospital General "Dr. Gaudencio González Garza", Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social IMSS, Mexico City 02990, Mexico
| | - Anahí Sánchez-Monciváis
- Laboratory of Immunology, Escuela Militar de Graduados de Sanidad, SEDENA, Mexico City 11200, Mexico
| | - Brenda Tecuatzi-Cadena
- Laboratory of Immunology, Escuela Militar de Graduados de Sanidad, SEDENA, Mexico City 11200, Mexico
| | - Karen Medina-Quero
- Laboratory of Immunology, Escuela Militar de Graduados de Sanidad, SEDENA, Mexico City 11200, Mexico
| | - María Guadalupe Córdova-Espinoza
- Laboratory of Medical Bacteriology, Department of Microbiology, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City 11350, Mexico
- Laboratory of Immunology, Escuela Militar de Graduados de Sanidad, SEDENA, Mexico City 11200, Mexico
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14
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Francis D, Bhairaddy A, Joy A, Hari GV, Francis A. Secretory proteins in the orchestration of microbial virulence: The curious case of Staphylococcus aureus. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2023; 133:271-350. [PMID: 36707204 DOI: 10.1016/bs.apcsb.2022.10.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Microbial virulence showcases an excellent model for adaptive changes that enable an organism to survive and proliferate in a hostile environment and exploit host resources to its own benefit. In Staphylococcus aureus, an opportunistic pathogen of the human host, known for the diversity of the disease conditions it inflicts and the rapid evolution of antibiotic resistance, virulence is a consequence of having a highly plastic genome that is amenable to quick reprogramming and the ability to express a diverse arsenal of virulence factors. Virulence factors that are secreted to the host milieu effectively manipulate the host conditions to favor bacterial survival and growth. They assist in colonization, nutrient acquisition, immune evasion, and systemic spread. The structural and functional characteristics of the secreted virulence proteins have been shaped to assist S. aureus in thriving and disseminating effectively within the host environment and exploiting the host resources to its best benefit. With the aim of highlighting the importance of secreted virulence proteins in bacterial virulence, the present chapter provides a comprehensive account of the role of the major secreted proteins of S. aureus in orchestrating its virulence in the human host.
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Affiliation(s)
- Dileep Francis
- Department of Life Sciences, Kristu Jayanti College, Autonomous, Bengaluru, Karnataka, India.
| | - Anusha Bhairaddy
- Department of Life Sciences, Kristu Jayanti College, Autonomous, Bengaluru, Karnataka, India
| | - Atheene Joy
- Department of Life Sciences, Kristu Jayanti College, Autonomous, Bengaluru, Karnataka, India
| | | | - Ashik Francis
- Rajiv Gandhi Centre for Biotechnology, Trivandrum, Kerala, India
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15
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In Silico Genome-Scale Analysis of Molecular Mechanisms Contributing to the Development of a Persistent Infection with Methicillin-Resistant Staphylococcus aureus (MRSA) ST239. Int J Mol Sci 2022; 23:ijms232416086. [PMID: 36555727 PMCID: PMC9781258 DOI: 10.3390/ijms232416086] [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: 10/30/2022] [Revised: 12/05/2022] [Accepted: 12/11/2022] [Indexed: 12/23/2022] Open
Abstract
The increasing frequency of isolation of methicillin-resistant Staphylococcus aureus (MRSA) limits the chances for the effective antibacterial therapy of staphylococcal diseases and results in the development of persistent infection such as bacteremia and osteomyelitis. The aim of this study was to identify features of the MRSAST239 0943-1505-2016 (SA943) genome that contribute to the formation of both acute and chronic musculoskeletal infections. The analysis was performed using comparative genomics data of the dominant epidemic S. aureus lineages, namely ST1, ST8, ST30, ST36, and ST239. The SA943 genome encodes proteins that provide resistance to the host's immune system, suppress immunological memory, and form biofilms. The molecular mechanisms of adaptation responsible for the development of persistent infection were as follows: amino acid substitution in PBP2 and PBP2a, providing resistance to ceftaroline; loss of a large part of prophage DNA and restoration of the nucleotide sequence of beta-hemolysin, that greatly facilitates the escape of phagocytosed bacteria from the phagosome and formation of biofilms; dysfunction of the AgrA system due to the presence of psm-mec and several amino acid substitutions in the AgrC; partial deletion of the nucleotide sequence in genomic island vSAβ resulting in the loss of two proteases of Spl-operon; and deletion of SD repeats in the SdrE amino acid sequence.
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16
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Kubatzky KF. Pasteurella multocida toxin - lessons learned from a mitogenic toxin. Front Immunol 2022; 13:1058905. [PMID: 36591313 PMCID: PMC9800868 DOI: 10.3389/fimmu.2022.1058905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/29/2022] [Indexed: 12/23/2022] Open
Abstract
The gram-negative, zoonotic bacterium Pasteurella multocida was discovered in 1880 and found to be the causative pathogen of fowl cholera. Pasteurella-related diseases can be found in domestic and wild life animals such as buffalo, sheep, goat, deer and antelope, cats, dogs and tigers and cause hemorrhagic septicemia in cattle, rhinitis or pneumonia in rabbits or fowl cholera in poultry and birds. Pasteurella multocida does not play a major role in the immune-competent human host, but can be found after animal bites or in people with close contact to animals. Toxigenic strains are most commonly found in pigs and express a phage-encoded 146 kDa protein, the Pasteurella multocida toxin (PMT). Toxin-expressing strains cause atrophic rhinitis where nasal turbinate bones are destroyed through the inhibition of bone building osteoblasts and the activation of bone resorbing osteoclasts. After its uptake through receptor-mediated endocytosis, PMT specifically targets the alpha subunit of several heterotrimeric G proteins and constitutively activates them through deamidation of a glutamine residue to glutamate in the alpha subunit. This results in cytoskeletal rearrangement, proliferation, differentiation and survival of cells. Because of the toxin's mitogenic effects, it was suggested that it might have carcinogenic properties, however, no link between Pasteurella infections and cell transformation could be established, neither in tissue culture models nor through epidemiological data. In the recent years it was shown that the toxin not only affects bone, but also the heart as well as basically all cells of innate and adaptive immunity. During the last decade the focus of research shifted from signal transduction processes to understanding how the bacteria might benefit from a bone-destroying toxin. The primary function of PMT seems to be the modulation of immune cell activation which at the same time creates an environment permissive for osteoclast formation. While the disease is restricted to pigs, the implications of the findings from PMT research can be used to explore human diseases and have a high translational potential. In this review our current knowledge will be summarized and it will be discussed what can be learned from using PMT as a tool to understand human pathologies.
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Affiliation(s)
- Katharina F. Kubatzky
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University, Heidelberg, Germany
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17
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Surman SL, Crawford J, Dash P, Tonkonogy SL, Thomas PG, Hurwitz JL. Microbiome Shapes the T Cell Receptor Repertoire among CD4+CD8+ Thymocytes. Biomedicines 2022; 10:biomedicines10123015. [PMID: 36551771 PMCID: PMC9775422 DOI: 10.3390/biomedicines10123015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 11/08/2022] [Accepted: 11/11/2022] [Indexed: 11/24/2022] Open
Abstract
The microbiome shapes the mature T cell receptor (TCR) repertoire and thereby influences pathogen control. To investigate microbiome influences on T cells at an earlier, immature stage, we compared single-cell TCR transcript sequences between CD4+CD8+ (double-positive) thymocytes from gnotobiotic [E. coli mono-associated (Ec)] and germ-free (GF) mice. Identical TCRβ transcripts (termed repeat, REP) were more often shared between cells of individual Ec mice compared to GF mice (Fishers Exact test, p < 0.0001). Among Ec REPs, a cluster of Vβ genes (Vβ12-1, 12-2, 13-1, and 13-2, termed 12-13) was well represented, whereas 12-13 sequences were not detected among GF REPs (Fishers Exact test, p = 0.046). Vα genes located in the distal region of the TCRα locus were more frequently expressed in Ec mice compared to GF mice, both among REPs and total sequences (Fishers Exact test, p = 0.009). Results illustrate how gut bacteria shape the TCR repertoire, not simply among mature T cells, but among immature CD4+CD8+ thymocytes.
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Affiliation(s)
- Sherri L. Surman
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Jeremy Crawford
- Department of Immunology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Pradyot Dash
- Lentigen, a Miltenyi Biotec Company, Gaithersburg, MD 20878, USA
| | - Susan L. Tonkonogy
- College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Paul G. Thomas
- Department of Immunology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Julia L. Hurwitz
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA
- Correspondence:
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18
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King CR, Mehle A. Retasking of canonical antiviral factors into proviral effectors. Curr Opin Virol 2022; 56:101271. [PMID: 36242894 PMCID: PMC10090225 DOI: 10.1016/j.coviro.2022.101271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/13/2022] [Accepted: 09/15/2022] [Indexed: 11/26/2022]
Abstract
Under constant barrage by viruses, hosts have evolved a plethora of antiviral effectors and defense mechanisms. To survive, viruses must adapt to evade or subvert these defenses while still capturing cellular resources to fuel their replication cycles. Large-scale studies of the antiviral activities of cellular proteins and processes have shown that different viruses are controlled by distinct subsets of antiviral genes. The remaining antiviral genes are either ineffective in controlling infection, or in some cases, actually promote infection. In these cases, classically defined antiviral factors are retasked by viruses to enhance viral replication. This creates a more nuanced picture revealing the contextual nature of antiviral activity. The same protein can exert different effects on replication, depending on multiple factors, including the host, the target cells, and the specific virus infecting it. Here, we review numerous examples of viruses hijacking canonically antiviral proteins and retasking them for proviral purposes.
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Affiliation(s)
- Cason R King
- Department of Medical Microbiology & Immunology, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Andrew Mehle
- Department of Medical Microbiology & Immunology, University of Wisconsin-Madison, Madison, WI 53706, USA.
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19
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Noval Rivas M, Porritt RA, Cheng MH, Bahar I, Arditi M. Multisystem Inflammatory Syndrome in Children and Long COVID: The SARS-CoV-2 Viral Superantigen Hypothesis. Front Immunol 2022; 13:941009. [PMID: 35874696 PMCID: PMC9300823 DOI: 10.3389/fimmu.2022.941009] [Citation(s) in RCA: 49] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 06/09/2022] [Indexed: 12/19/2022] Open
Abstract
Multisystem inflammatory syndrome in children (MIS-C) is a febrile pediatric inflammatory disease that may develop weeks after initial SARS-CoV-2 infection or exposure. MIS-C involves systemic hyperinflammation and multiorgan involvement, including severe cardiovascular, gastrointestinal (GI) and neurological symptoms. Some clinical attributes of MIS-C-such as persistent fever, rashes, conjunctivitis and oral mucosa changes (red fissured lips and strawberry tongue)-overlap with features of Kawasaki disease (KD). In addition, MIS-C shares striking clinical similarities with toxic shock syndrome (TSS), which is triggered by bacterial superantigens (SAgs). The remarkable similarities between MIS-C and TSS prompted a search for SAg-like structures in the SARS-CoV-2 virus and the discovery of a unique SAg-like motif highly similar to a Staphylococcal enterotoxin B (SEB) fragment in the SARS-CoV-2 spike 1 (S1) glycoprotein. Computational studies suggest that the SAg-like motif has a high affinity for binding T-cell receptors (TCRs) and MHC Class II proteins. Immunosequencing of peripheral blood samples from MIS-C patients revealed a profound expansion of TCR β variable gene 11-2 (TRBV11-2), which correlates with MIS-C severity and serum cytokine levels, consistent with a SAg-triggered immune response. Computational sequence analysis of SARS-CoV-2 spike further identified conserved neurotoxin-like motifs which may alter neuronal cell function and contribute to neurological symptoms in COVID-19 and MIS-C patients. Additionally, autoantibodies are detected during MIS-C, which may indicate development of post-SARS-CoV-2 autoreactive and autoimmune responses. Finally, prolonged persistence of SARS-CoV-2 RNA in the gut, increased gut permeability and elevated levels of circulating S1 have been observed in children with MIS-C. Accordingly, we hypothesize that continuous and prolonged exposure to the viral SAg-like and neurotoxin-like motifs in SARS-CoV-2 spike may promote autoimmunity leading to the development of post-acute COVID-19 syndromes, including MIS-C and long COVID, as well as the neurological complications resulting from SARS-CoV-2 infection.
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Affiliation(s)
- Magali Noval Rivas
- Department of Pediatrics, Division of Infectious Diseases and Immunology, Guerin Children's at Cedars-Sinai Medical Center, Los Angeles, CA, United States
- Infectious and Immunologic Diseases Research Center (IIDRC) and Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States
| | - Rebecca A Porritt
- Department of Pediatrics, Division of Infectious Diseases and Immunology, Guerin Children's at Cedars-Sinai Medical Center, Los Angeles, CA, United States
- Infectious and Immunologic Diseases Research Center (IIDRC) and Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States
| | - Mary Hongying Cheng
- Department of Computational and Systems Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, United States
| | - Ivet Bahar
- Department of Computational and Systems Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, United States
| | - Moshe Arditi
- Department of Pediatrics, Division of Infectious Diseases and Immunology, Guerin Children's at Cedars-Sinai Medical Center, Los Angeles, CA, United States
- Infectious and Immunologic Diseases Research Center (IIDRC) and Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States
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20
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Takayasu M, Hirayama K, Shimohata H, Kobayashi M, Koyama A. Staphylococcus aureus Infection-Related Glomerulonephritis with Dominant IgA Deposition. Int J Mol Sci 2022; 23:ijms23137482. [PMID: 35806487 PMCID: PMC9267153 DOI: 10.3390/ijms23137482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/02/2022] [Accepted: 07/04/2022] [Indexed: 11/29/2022] Open
Abstract
Since 1995, when we reported the case of a patient with glomerulonephritis with IgA deposition that occurred after a methicillin-resistant Staphylococcus aureus (MRSA) infection, many reports of MRSA infection-associated glomerulonephritis have accumulated. This disease is being systematized as Staphylococcus infection-associated glomerulonephritis (SAGN) in light of the apparent cause of infection, and as immunoglobulin A-dominant deposition infection-related glomerulonephritis (IgA-IRGN) in light of its histopathology. This glomerulonephritis usually presents as rapidly progressive glomerulonephritis or acute kidney injury with various degrees of proteinuria and microscopic hematuria along with an ongoing infection. Its renal pathology has shown several types of mesangial and/or endocapillary proliferative glomerulonephritis with various degrees of crescent formation and tubulointerstitial nephritis. IgA, IgG, and C3 staining in the mesangium and along the glomerular capillary walls have been observed on immunofluorescence examinations. A marked activation of T cells, an increase in specific variable regions of the T-cell receptor β-chain-positive cells, hypercytokinemia, and increased polyclonal immune complexes have also been observed in this glomerulonephritis. In the development of this disease, staphylococcal enterotoxin may be involved as a superantigen, but further investigations are needed to clarify the mechanisms underlying this disease. Here, we review 336 cases of IgA-IRGN and 218 cases of SAGN.
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Affiliation(s)
- Mamiko Takayasu
- Department of Nephrology, Tokyo Medical University Ibaraki Medical Center, Ami 300-0395, Ibaraki, Japan; (M.T.); (H.S.); (M.K.)
| | - Kouichi Hirayama
- Department of Nephrology, Tokyo Medical University Ibaraki Medical Center, Ami 300-0395, Ibaraki, Japan; (M.T.); (H.S.); (M.K.)
- Correspondence: ; Tel.: +81-29-887-1161
| | - Homare Shimohata
- Department of Nephrology, Tokyo Medical University Ibaraki Medical Center, Ami 300-0395, Ibaraki, Japan; (M.T.); (H.S.); (M.K.)
| | - Masaki Kobayashi
- Department of Nephrology, Tokyo Medical University Ibaraki Medical Center, Ami 300-0395, Ibaraki, Japan; (M.T.); (H.S.); (M.K.)
| | - Akio Koyama
- Emeritus Professor, University of Tsukuba, Tsukuba 305-8577, Ibaraki, Japan;
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21
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Matsunaga A, Tsuzuki S, Morioka S, Ohmagari N, Ishizaka Y. Long COVID: current status in Japan and knowledge about its molecular background. Glob Health Med 2022; 4:83-93. [PMID: 35586759 PMCID: PMC9066464 DOI: 10.35772/ghm.2022.01013] [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: 03/09/2022] [Revised: 03/23/2022] [Accepted: 04/04/2022] [Indexed: 06/15/2023]
Abstract
Even after recovering from coronavirus disease 2019 (COVID-19), patients can experience prolonged complaints, referred to as "long COVID". Similar to reports in Caucasians, a follow-up study in Japan revealed that fatigue, dyspnea, cough, anosmia/dysgeusia, and dyssomnia are common symptoms. Although the precise mode of long COVID remains elusive, multiple etiologies such as direct organ damage by infection with severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), autoimmunity, prolonged inflammatory reactions, and psychiatric impairment seem to be involved. Notably, SARS-CoV-2 is neurotropic, and viral RNA and proteins are continuously detectable in multiple organs, including the brain. Viral proteins exert a number of different toxic effects on cells, suggesting that persistent infection is a key element for understanding long COVID. Here, we first reviewed the current status of long COVID in Japan, and then summarized literature that help us understand the molecular background of the symptoms. Finally, we discuss the feasibility of vaccination as a treatment for patients with long COVID.
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Affiliation(s)
- Akihiro Matsunaga
- Department of Intractable Diseases, National Center for Global Health and Medicine, Tokyo, Japan
| | - Shinya Tsuzuki
- AMR Clinical Reference Center, National Center for Global Health and Medicine Hospital, Tokyo, Japan
| | - Shinichiro Morioka
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Norio Ohmagari
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Yukihito Ishizaka
- Department of Intractable Diseases, National Center for Global Health and Medicine, Tokyo, Japan
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22
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Ling WL, Su CTT, Lua WH, Yeo JY, Poh JJ, Ng YL, Wipat A, Gan SKE. Variable-heavy (VH) families influencing IgA1&2 engagement to the antigen, FcαRI and superantigen proteins G, A, and L. Sci Rep 2022; 12:6510. [PMID: 35444201 PMCID: PMC9020155 DOI: 10.1038/s41598-022-10388-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 04/07/2022] [Indexed: 12/18/2022] Open
Abstract
Interest in IgA as an alternative antibody format has increased over the years with much remaining to be investigated in relation to interactions with immune cells. Considering the recent whole antibody investigations showing significant distal effects between the variable (V) and constant (C)- regions that can be mitigated by the hinge regions of both human IgA subtypes A1 and A2, we performed an in-depth mechanistic investigation using a panel of 28 IgA1s and A2s of both Trastuzumab and Pertuzumab models. FcαRI binding were found to be mitigated by the differing glycosylation patterns in IgA1 and 2 with contributions from the CDRs. On their interactions with antigen-Her2 and superantigens PpL, SpG and SpA, PpL was found to sterically hinder Her2 antigen binding with unexpected findings of IgAs binding SpG at the CH2-3 region alongside SpA interacting with IgAs at the CH1. Although the VH3 framework (FWR) is commonly used in CDR grafting, we found the VH1 framework (FWR) to be a possible alternative when grafting IgA1 and 2 owing to its stronger binding to antigen Her2 and weaker interactions to superantigen Protein L and A. These findings lay the foundation to understanding the interactions between IgAs and microbial superantigens, and also guide the engineering of IgAs for future antibody applications and targeting of superantigen-producing microbes.
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Affiliation(s)
- Wei-Li Ling
- Antibody & Product Development Lab, Experimental Drug Development Centre, Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.,Newcastle University Singapore, Singapore, Singapore
| | - Chinh Tran-To Su
- Antibody & Product Development Lab, Experimental Drug Development Centre, Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Wai-Heng Lua
- Antibody & Product Development Lab, Experimental Drug Development Centre, Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Joshua Yi Yeo
- Antibody & Product Development Lab, Experimental Drug Development Centre, Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Jun-Jie Poh
- Antibody & Product Development Lab, Experimental Drug Development Centre, Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Yuen-Ling Ng
- Newcastle University Singapore, Singapore, Singapore
| | - Anil Wipat
- School of Computing, Newcastle University, Newcastle upon Tyne, UK
| | - Samuel Ken-En Gan
- Antibody & Product Development Lab, Experimental Drug Development Centre, Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore. .,James Cook University, Singapore, Singapore. .,Zhejiang Bioinformatics International Science and Technology Cooperation Center, Wenzhou-Kean University, Wenzhou, Zhejiang Province, China. .,Wenzhou Municipal Key Lab of Applied Biomedical and Biopharmaceutical Informatics, Wenzhou-Kean University, Wenzhou, Zhejiang Province, China.
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23
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Hamdy A, Leonardi A. Superantigens and SARS-CoV-2. Pathogens 2022; 11:pathogens11040390. [PMID: 35456065 PMCID: PMC9026686 DOI: 10.3390/pathogens11040390] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/03/2022] [Accepted: 03/22/2022] [Indexed: 12/31/2022] Open
Abstract
It has been posited SARS-CoV-2 contains at least one unique superantigen-like motif not found in any other SARS or endemic coronaviruses. Superantigens are potent antigens that can send the immune system into overdrive. SARS-CoV-2 causes many of the biological and clinical consequences of a superantigen, and, in the context of reinfection and waning immunity, it is important to better understand the impact of a widely circulating, airborne pathogen that may be a superantigen, superantigen-like or trigger a superantigenic host response. Urgent research is needed to better understand the long-term risks being taken by governments whose policies enable widespread transmission of a potential superantigenic pathogen, and to more clearly define the vaccination and public health policies needed to protect against the consequences of repeat exposure to the pathogen.
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Affiliation(s)
- Adam Hamdy
- Panres Pandemic Research, Newport TF10 8PG, UK
- Correspondence:
| | - Anthony Leonardi
- Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA;
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24
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Gan SKE, Phua SX, Yeo JY. Sagacious epitope selection for vaccines, and both antibody-based therapeutics and diagnostics: tips from virology and oncology. Antib Ther 2022; 5:63-72. [PMID: 35372784 PMCID: PMC8972324 DOI: 10.1093/abt/tbac005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 01/24/2022] [Accepted: 02/12/2022] [Indexed: 11/12/2022] Open
Abstract
Abstract
The target of an antibody plays a significant role in the success of antibody-based therapeutics and diagnostics, and vaccine development. This importance is focused on the target binding site—epitope, where epitope selection as a part of design thinking beyond traditional antigen selection using whole cell or whole protein immunization can positively impact success. With purified recombinant protein production and peptide synthesis to display limited/selected epitopes, intrinsic factors that can affect the functioning of resulting antibodies can be more easily selected for. Many of these factors stem from the location of the epitope that can impact accessibility of the antibody to the epitope at a cellular or molecular level, direct inhibition of target antigen activity, conservation of function despite escape mutations, and even non-competitive inhibition sites. By incorporating novel computational methods for predicting antigen changes to model-informed drug discovery and development, superior vaccines and antibody-based therapeutics or diagnostics can be easily designed to mitigate failures. With detailed examples, this review highlights the new opportunities, factors and methods of predicting antigenic changes for consideration in sagacious epitope selection.
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Affiliation(s)
- Samuel Ken-En Gan
- Antibody & Product Development Lab, EDDC-BII, Agency for Science, Technology and Research (A*STAR), Singapore 138672, Singapore
- APD SKEG Pte Ltd, Singapore 439444, Singapore
| | - Ser-Xian Phua
- Antibody & Product Development Lab, EDDC-BII, Agency for Science, Technology and Research (A*STAR), Singapore 138672, Singapore
| | - Joshua Yi Yeo
- Antibody & Product Development Lab, EDDC-BII, Agency for Science, Technology and Research (A*STAR), Singapore 138672, Singapore
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25
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Ling WL, Yeo JY, Ng YL, Wipat A, Gan SKE. More Than Meets the Kappa for Antibody Superantigen Protein L (PpL). Antibodies (Basel) 2022; 11:antib11010014. [PMID: 35225872 PMCID: PMC8883962 DOI: 10.3390/antib11010014] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 02/04/2022] [Accepted: 02/07/2022] [Indexed: 02/04/2023] Open
Abstract
Immunoglobulin superantigens play an important role in affinity purification of antibodies and the microbiota-immune axis at mucosal areas. Based on current understanding, Staphylococcal Protein A (SpA), Streptococcal Protein G (SpG) and Finegoldia Protein L (PpL) are thought to only bind specific regions of human antibodies, allowing for selective purification of antibody isotypes and chains. Clinically, these superantigens are often classified as toxins and increase the virulence of the producing pathogen through unspecific interactions with immune proteins. To perform an in-depth interaction study of these three superantigens with antibodies, bio-layer interferometry (BLI) measurements of their interactions with a permutation panel of 63 IgG1 variants of Pertuzumab and Trastuzumab CDRs grafted to the six human Vκ and seven human VH region families were tested. Through this holistic and systemic analysis of IgG1 variants with various antibody regions modified, comparisons revealed novel PpL–antibody interactions influenced by other non-canonical antibody known light-chain framework regions, whereas SpA and SpG showed relatively consistent interactions. These findings have implications on PpL-based affinity antibody purification and design that can guide the engineering and understanding of PpL-based microbiota-immune effects.
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Affiliation(s)
- Wei-Li Ling
- Antibody & Product Development Laboratory, Experimental Drug Development Centre—Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore 138672, Singapore; (W.-L.L.); (J.Y.Y.)
- Newcastle Research and Innovation Institute (NewRIIS), Singapore 609607, Singapore;
| | - Joshua Yi Yeo
- Antibody & Product Development Laboratory, Experimental Drug Development Centre—Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore 138672, Singapore; (W.-L.L.); (J.Y.Y.)
| | - Yuen-Ling Ng
- Newcastle Research and Innovation Institute (NewRIIS), Singapore 609607, Singapore;
| | - Anil Wipat
- School of Computing, Newcastle University, Newcastle upon Tyne NE1 7RU, UK;
| | - Samuel Ken-En Gan
- Antibody & Product Development Laboratory, Experimental Drug Development Centre—Bioinformatics Institute, Agency for Science, Technology and Research (A*STAR), Singapore 138672, Singapore; (W.-L.L.); (J.Y.Y.)
- James Cook University, Singapore 387380, Singapore
- Correspondence:
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26
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Lakshmanan HG, Miller E, White-Canale A, McCluskey LP. Immune responses in the injured olfactory and gustatory systems: a role in olfactory receptor neuron and taste bud regeneration? Chem Senses 2022; 47:bjac024. [PMID: 36152297 PMCID: PMC9508897 DOI: 10.1093/chemse/bjac024] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Sensory cells that specialize in transducing olfactory and gustatory stimuli are renewed throughout life and can regenerate after injury unlike their counterparts in the mammalian retina and auditory epithelium. This uncommon capacity for regeneration offers an opportunity to understand mechanisms that promote the recovery of sensory function after taste and smell loss. Immune responses appear to influence degeneration and later regeneration of olfactory sensory neurons and taste receptor cells. Here we review surgical, chemical, and inflammatory injury models and evidence that immune responses promote or deter chemosensory cell regeneration. Macrophage and neutrophil responses to chemosensory receptor injury have been the most widely studied without consensus on their net effects on regeneration. We discuss possible technical and biological reasons for the discrepancy, such as the difference between peripheral and central structures, and suggest directions for progress in understanding immune regulation of chemosensory regeneration. Our mechanistic understanding of immune-chemosensory cell interactions must be expanded before therapies can be developed for recovering the sensation of taste and smell after head injury from traumatic nerve damage and infection. Chemosensory loss leads to decreased quality of life, depression, nutritional challenges, and exposure to environmental dangers highlighting the need for further studies in this area.
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Affiliation(s)
- Hari G Lakshmanan
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Elayna Miller
- Department of Medical Illustration, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - AnnElizabeth White-Canale
- Department of Medical Illustration, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Lynnette P McCluskey
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
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Yeo JY, Gan SKE. Peering into Avian Influenza A(H5N8) for a Framework towards Pandemic Preparedness. Viruses 2021; 13:2276. [PMID: 34835082 PMCID: PMC8622263 DOI: 10.3390/v13112276] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 10/20/2021] [Accepted: 11/12/2021] [Indexed: 12/13/2022] Open
Abstract
2014 marked the first emergence of avian influenza A(H5N8) in Jeonbuk Province, South Korea, which then quickly spread worldwide. In the midst of the 2020-2021 H5N8 outbreak, it spread to domestic poultry and wild waterfowl shorebirds, leading to the first human infection in Astrakhan Oblast, Russia. Despite being clinically asymptomatic and without direct human-to-human transmission, the World Health Organization stressed the need for continued risk assessment given the nature of Influenza to reassort and generate novel strains. Given its promiscuity and easy cross to humans, the urgency to understand the mechanisms of possible species jumping to avert disastrous pandemics is increasing. Addressing the epidemiology of H5N8, its mechanisms of species jumping and its implications, mutational and reassortment libraries can potentially be built, allowing them to be tested on various models complemented with deep-sequencing and automation. With knowledge on mutational patterns, cellular pathways, drug resistance mechanisms and effects of host proteins, we can be better prepared against H5N8 and other influenza A viruses.
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Affiliation(s)
- Joshua Yi Yeo
- Antibody & Product Development Lab, EDDC-BII, Agency for Science, Technology and Research (A*STAR), Singapore 138672, Singapore;
| | - Samuel Ken-En Gan
- Antibody & Product Development Lab, EDDC-BII, Agency for Science, Technology and Research (A*STAR), Singapore 138672, Singapore;
- APD SKEG Pte Ltd., Singapore 439444, Singapore
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