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Zoodsma M, de Nooijer AH, Grondman I, Gupta MK, Bonifacius A, Koeken VACM, Kooistra E, Kilic G, Bulut O, Gödecke N, Janssen N, Kox M, Domínguez-Andrés J, van Gammeren AJ, Ermens AAM, van der Ven AJAM, Pickkers P, Blasczyk R, Behrens GMN, van de Veerdonk FL, Joosten LAB, Xu CJ, Eiz-Vesper B, Netea MG, Li Y. Targeted proteomics identifies circulating biomarkers associated with active COVID-19 and post-COVID-19. Front Immunol 2022; 13:1027122. [PMID: 36405747 PMCID: PMC9670186 DOI: 10.3389/fimmu.2022.1027122] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [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: 08/24/2022] [Accepted: 10/17/2022] [Indexed: 07/25/2023] Open
Abstract
The ongoing Coronavirus Disease 2019 (COVID-19) pandemic is caused by the highly infectious Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2). There is an urgent need for biomarkers that will help in better stratification of patients and contribute to personalized treatments. We performed targeted proteomics using the Olink platform and systematically investigated protein concentrations in 350 hospitalized COVID-19 patients, 186 post-COVID-19 individuals, and 61 healthy individuals from 3 independent cohorts. Results revealed a signature of acute SARS-CoV-2 infection, which is represented by inflammatory biomarkers, chemokines and complement-related factors. Furthermore, the circulating proteome is still significantly affected in post-COVID-19 samples several weeks after infection. Post-COVID-19 individuals are characterized by upregulation of mediators of the tumor necrosis (TNF)-α signaling pathways and proteins related to transforming growth factor (TGF)-ß. In addition, the circulating proteome is able to differentiate between patients with different COVID-19 disease severities, and is associated with the time after infection. These results provide important insights into changes induced by SARS-CoV-2 infection at the proteomic level by integrating several cohorts to obtain a large disease spectrum, including variation in disease severity and time after infection. These findings could guide the development of host-directed therapy in COVID-19.
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Affiliation(s)
- Martijn Zoodsma
- Centre for Individualised Infection Medicine (CiiM), a joint venture between the Helmholtz Centre for Infection Research (HZI) and Hannover Medical School (MHH), Hannover, Germany
- TWINCORE, a joint venture between the Helmholtz Centre for Infection Research (HZI) and the Hannover Medical School (MHH), Hannover, Germany
| | - Aline H. de Nooijer
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Inge Grondman
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Manoj Kumar Gupta
- Centre for Individualised Infection Medicine (CiiM), a joint venture between the Helmholtz Centre for Infection Research (HZI) and Hannover Medical School (MHH), Hannover, Germany
- TWINCORE, a joint venture between the Helmholtz Centre for Infection Research (HZI) and the Hannover Medical School (MHH), Hannover, Germany
| | - Agnes Bonifacius
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Valerie A. C. M. Koeken
- Centre for Individualised Infection Medicine (CiiM), a joint venture between the Helmholtz Centre for Infection Research (HZI) and Hannover Medical School (MHH), Hannover, Germany
- TWINCORE, a joint venture between the Helmholtz Centre for Infection Research (HZI) and the Hannover Medical School (MHH), Hannover, Germany
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Emma Kooistra
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Gizem Kilic
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Ozlem Bulut
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Nina Gödecke
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Nico Janssen
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Matthijs Kox
- Department of Intensive Care Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Jorge Domínguez-Andrés
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | | | - Anton A. M. Ermens
- Department of Clinical Chemistry and Hematology, Amphia Hospital, Breda, Netherlands
| | - Andre J. A. M. van der Ven
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Peter Pickkers
- Department of Intensive Care Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Rainer Blasczyk
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Georg M. N. Behrens
- Centre for Individualised Infection Medicine (CiiM), a joint venture between the Helmholtz Centre for Infection Research (HZI) and Hannover Medical School (MHH), Hannover, Germany
- Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany
- German Center for Infection Research (DZIF), partner site Hannover-Braunschweig, Hannover, Germany
| | - Frank L. van de Veerdonk
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Leo A. B. Joosten
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
- Department of Medical Genetics, Iuliu Haţieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Cheng-Jian Xu
- Centre for Individualised Infection Medicine (CiiM), a joint venture between the Helmholtz Centre for Infection Research (HZI) and Hannover Medical School (MHH), Hannover, Germany
- TWINCORE, a joint venture between the Helmholtz Centre for Infection Research (HZI) and the Hannover Medical School (MHH), Hannover, Germany
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
| | - Britta Eiz-Vesper
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Mihai G. Netea
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
- Department for Genomics and Immunoregulation, Life and Medical Sciences Institute (LIMES), University of Bonn, Bonn, Germany
| | - Yang Li
- Centre for Individualised Infection Medicine (CiiM), a joint venture between the Helmholtz Centre for Infection Research (HZI) and Hannover Medical School (MHH), Hannover, Germany
- TWINCORE, a joint venture between the Helmholtz Centre for Infection Research (HZI) and the Hannover Medical School (MHH), Hannover, Germany
- Department of Internal Medicine and Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, Netherlands
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Bonifacius A, Tischer-Zimmermann S, Santamorena MM, Mausberg P, Schenk J, Koch S, Barnstorf-Brandes J, Gödecke N, Martens J, Goudeva L, Verboom M, Wittig J, Maecker-Kolhoff B, Baurmann H, Clark C, Brauns O, Simon M, Lang P, Cornely OA, Hallek M, Blasczyk R, Seiferling D, Köhler P, Eiz-Vesper B. Rapid Manufacturing of Highly Cytotoxic Clinical-Grade SARS-CoV-2-specific T Cell Products Covering SARS-CoV-2 and Its Variants for Adoptive T Cell Therapy. Front Bioeng Biotechnol 2022; 10:867042. [PMID: 35480981 PMCID: PMC9036989 DOI: 10.3389/fbioe.2022.867042] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 03/07/2022] [Indexed: 12/12/2022] Open
Abstract
Objectives: Evaluation of the feasibility of SARS-CoV-2-specific T cell manufacturing for adoptive T cell transfer in COVID-19 patients at risk to develop severe disease. Methods: Antiviral SARS-CoV-2-specific T cells were detected in blood of convalescent COVID-19 patients following stimulation with PepTivator SARS-CoV-2 Select using Interferon-gamma Enzyme-Linked Immunospot (IFN-γ ELISpot), SARS-CoV-2 T Cell Analysis Kit (Whole Blood) and Cytokine Secretion Assay (CSA) and were characterized with respect to memory phenotype, activation state and cytotoxic potential by multicolor flow cytometry, quantitative real-time PCR and multiplex analyses. Clinical-grade SARS-CoV-2-specific T cell products were generated by stimulation with MACS GMP PepTivator SARS-CoV-2 Select using CliniMACS Prodigy and CliniMACS Cytokine Capture System (IFN-gamma) (CCS). Functionality of enriched T cells was investigated in cytotoxicity assays and by multiplex analysis of secreted cytotoxic molecules upon target recognition. Results: Donor screening via IFN-γ ELISpot allows for pre-selection of potential donors for generation of SARS-CoV-2-specific T cells. Antiviral T cells reactive against PepTivator SARS-CoV-2 Select could be magnetically enriched from peripheral blood of convalescent COVID-19 patients by small-scale CSA resembling the clinical-grade CCS manufacturing process and showed an activated and cytotoxic T cell phenotype. Four clinical-grade SARS-CoV-2-specific T cell products were successfully generated with sufficient cell numbers and purities comparable to those observed in donor pretesting via CSA. The T cells in the generated products were shown to be capable to replicate, specifically recognize and kill target cells in vitro and secrete cytotoxic molecules upon target recognition. Cell viability, total CD3+ cell number, proliferative capacity and cytotoxic potential remained stable throughout storage of up to 72 h after end of leukapheresis. Conclusion: Clinical-grade SARS-CoV-2-specific T cells are functional, have proliferative capacity and target-specific cytotoxic potential. Their function and phenotype remain stable for several days after enrichment. The adoptive transfer of partially matched, viable human SARS-CoV-2-specific T lymphocytes collected from convalescent individuals may provide the opportunity to support the immune system of COVID-19 patients at risk for severe disease.
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Affiliation(s)
- Agnes Bonifacius
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Sabine Tischer-Zimmermann
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Maria Michela Santamorena
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Philip Mausberg
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Josephine Schenk
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Stephanie Koch
- Deutsche Gesellschaft für Gewebetransplantation, Hannover, Germany
| | - Johanna Barnstorf-Brandes
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Nina Gödecke
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Jörg Martens
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Lilia Goudeva
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Murielle Verboom
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | - Jana Wittig
- Department I of Internal Medicine, Faculty of Medicine and University Hospital Cologne, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf, University of Cologne, Cologne, Germany.,Faculty of Medicine and University Hospital Cologne, Translational Research, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Britta Maecker-Kolhoff
- Department of Pediatric Hematology and Oncology, Hannover Medical School, Hannover, Germany
| | | | - Caren Clark
- Miltenyi Biotec B.V. & Co. KG, Bergisch Gladbach, Germany
| | - Olaf Brauns
- Miltenyi Biotec B.V. & Co. KG, Bergisch Gladbach, Germany
| | - Martina Simon
- Miltenyi Biotec B.V. & Co. KG, Bergisch Gladbach, Germany
| | - Peter Lang
- Department of Pediatric Hematology and Oncology, University Children's Hospital, University of Tuebingen, Tuebingen, Germany
| | - Oliver A Cornely
- Department I of Internal Medicine, Faculty of Medicine and University Hospital Cologne, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf, University of Cologne, Cologne, Germany.,Faculty of Medicine and University Hospital Cologne, Translational Research, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.,Faculty of Medicine and University Hospital Cologne, Clinical Trials Centre Cologne (ZKS Köln), University of Cologne, Cologne, Germany.,German Centre for Infection Research (DZIF), Partner Site Bonn-Cologne, Cologne, Germany
| | - Michael Hallek
- Department I of Internal Medicine, Faculty of Medicine and University Hospital Cologne, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf, University of Cologne, Cologne, Germany
| | - Rainer Blasczyk
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
| | | | - Philipp Köhler
- Department I of Internal Medicine, Faculty of Medicine and University Hospital Cologne, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf, University of Cologne, Cologne, Germany.,Faculty of Medicine and University Hospital Cologne, Translational Research, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Britta Eiz-Vesper
- Hannover Medical School, Institute of Transfusion Medicine and Transplant Engineering, Hannover, Germany
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3
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Stankov MV, Cossmann A, Bonifacius A, Dopfer-Jablonka A, Ramos GM, Gödecke N, Scharff AZ, Happle C, Boeck AL, Tran AT, Pink I, Hoeper MM, Blasczyk R, Winkler MS, Nehlmeier I, Kempf A, Hofmann-Winkler H, Hoffmann M, Eiz-Vesper B, Pöhlmann S, Behrens GMN. Humoral and Cellular Immune Responses Against Severe Acute Respiratory Syndrome Coronavirus 2 Variants and Human Coronaviruses After Single BNT162b2 Vaccination. Clin Infect Dis 2021; 73:2000-2008. [PMID: 34134134 PMCID: PMC8384414 DOI: 10.1093/cid/ciab555] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Vaccine-induced neutralizing antibodies are key in combating the coronavirus disease 2019 (COVID-19) pandemic. However, delays of boost immunization due to limited availability of vaccines may leave individuals vulnerable to infection and prolonged or severe disease courses. The emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern (VOC)-B.1.1.7 (United Kingdom), B.1.351 (South Africa), and P.1 (Brazil)-may exacerbate this issue, as the latter two are able to evade control by antibodies. METHODS We assessed humoral and T-cell responses against SARS-CoV-2 wild-type (WT), VOC, and endemic human coronaviruses (hCoVs) that were induced after single and double vaccination with BNT162b2. RESULTS Despite readily detectable immunoglobulin G (IgG) against the receptor-binding domain of the SARS-CoV-2 S protein at day 14 after a single vaccination, inhibition of SARS-CoV-2 S-driven host cell entry was weak and particularly low for the B.1.351 variant. Frequencies of SARS-CoV-2 WT and VOC-specific T cells were low in many vaccinees after application of a single dose and influenced by immunity against endemic hCoV. The second vaccination significantly boosted T-cell frequencies reactive for WT and B.1.1.7 and B.1.351 variants. CONCLUSIONS These results call into question whether neutralizing antibodies significantly contribute to protection against COVID-19 upon single vaccination and suggest that cellular immunity is central for the early defenses against COVID-19.
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Affiliation(s)
- Metodi V Stankov
- Department of Rheumatology and Immunology, Hannover
Medical School, Hannover, Germany
| | - Anne Cossmann
- Department of Rheumatology and Immunology, Hannover
Medical School, Hannover, Germany
| | - Agnes Bonifacius
- Institute of Transfusion Medicine and Transplant
Engineering, Hannover Medical School,
Hannover, Germany
| | - Alexandra Dopfer-Jablonka
- Department of Rheumatology and Immunology, Hannover
Medical School, Hannover, Germany
- German Center for Infection Research, partner site
Hannover-Braunschweig, Braunschweig,
Germany
| | - Gema Morillas Ramos
- Department of Rheumatology and Immunology, Hannover
Medical School, Hannover, Germany
| | - Nina Gödecke
- Institute of Transfusion Medicine and Transplant
Engineering, Hannover Medical School,
Hannover, Germany
| | - Anna Zychlinsky Scharff
- Department of Pediatric Pneumology, Allergology and
Neonatology, Hannover Medical School,
Hannover, Germany
| | - Christine Happle
- Department of Pediatric Pneumology, Allergology and
Neonatology, Hannover Medical School,
Hannover, Germany
- German Center for Lung Research, Biomedical Research in
End Stage and Obstructive Lung Disease,
Hannover, Germany
| | - Anna-Lena Boeck
- Department for Neurology, Hannover Medical
School, Hannover, Germany
| | - Anh Thu Tran
- Department for Neurology, Hannover Medical
School, Hannover, Germany
| | - Isabell Pink
- Department of Pneumology, Hannover Medical School, member
of the German Center for Lung Research,
Hannover, Germany
| | - Marius M Hoeper
- Department of Pneumology, Hannover Medical School, member
of the German Center for Lung Research,
Hannover, Germany
| | - Rainer Blasczyk
- Institute of Transfusion Medicine and Transplant
Engineering, Hannover Medical School,
Hannover, Germany
| | - Martin S Winkler
- Department of Anaesthesiology and Intensive Care Unit,
University of Göttingen Medical Center, Georg-August University of
Göttingen, Göttingen, Germany
| | - Inga Nehlmeier
- Infection Biology Unit, German Primate
Center, Göttingen, Germany
| | - Amy Kempf
- Infection Biology Unit, German Primate
Center, Göttingen, Germany
| | | | - Markus Hoffmann
- Infection Biology Unit, German Primate
Center, Göttingen, Germany
- Faculty of Biology and Psychology,
Georg-August-Universität Göttingen,
Göttingen, Germany
| | - Britta Eiz-Vesper
- Institute of Transfusion Medicine and Transplant
Engineering, Hannover Medical School,
Hannover, Germany
| | - Stefan Pöhlmann
- Infection Biology Unit, German Primate
Center, Göttingen, Germany
- Faculty of Biology and Psychology,
Georg-August-Universität Göttingen,
Göttingen, Germany
| | - Georg M N Behrens
- Department of Rheumatology and Immunology, Hannover
Medical School, Hannover, Germany
- German Center for Infection Research, partner site
Hannover-Braunschweig, Braunschweig,
Germany
- Centre for Individualized Infection
Medicine, Hannover, Germany
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4
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Gussarow D, Bonifacius A, Cossmann A, Stankov MV, Mausberg P, Tischer-Zimmermann S, Gödecke N, Kalinke U, Behrens GMN, Blasczyk R, Eiz-Vesper B. Long-Lasting Immunity Against SARS-CoV-2: Dream or Reality? Front Med (Lausanne) 2021; 8:770381. [PMID: 34901085 PMCID: PMC8656217 DOI: 10.3389/fmed.2021.770381] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 10/29/2021] [Indexed: 12/14/2022] Open
Abstract
Since its declaration as a pandemic in March 2020, SARS-CoV-2 has infected more than 217 million people worldwide and despite mild disease in the majority of the cases, more than 4.5 million cases of COVID-19-associated death have been reported as of September 2021. The question whether recovery from COVID-19 results in prevention of reinfection can be answered with a "no" since cases of reinfections have been reported. The more important question is whether during SARS-CoV-2 infection, a protective immunity is built and maintained afterwards in a way which protects from possibly severe courses of disease in case of a reinfection. A similar question arises with respect to vaccination: as of September 2021, globally, more than 5.2 billion doses of vaccines have been administered. Therefore, it is of utmost importance to study the cellular and humoral immunity toward SARS-CoV-2 in a longitudinal manner. In this study, reconvalescent COVID-19 patients have been followed up for more than 1 year after SARS-CoV-2 infection to characterize in detail the long-term humoral as well as cellular immunity. Both SARS-CoV-2-specific T cells and antibodies could be detected for a period of more than 1 year after infection, indicating that the immune protection established during initial infection is maintained and might possibly protect from severe disease in case of reinfection or infection with novel emerging variants. Moreover, these data demonstrate the opportunity for immunotherapy of hospitalized COVID-19 patients via adoptive transfer of functional antiviral T cells isolated from reconvalescent individuals.
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Affiliation(s)
- Daniel Gussarow
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hanover, Germany
| | - Agnes Bonifacius
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hanover, Germany
| | - Anne Cossmann
- Department of Rheumatology and Clinical Immunology, Hannover Medical School, Hanover, Germany
| | - Metodi V. Stankov
- Department of Rheumatology and Clinical Immunology, Hannover Medical School, Hanover, Germany
| | - Philip Mausberg
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hanover, Germany
| | - Sabine Tischer-Zimmermann
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hanover, Germany
| | - Nina Gödecke
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hanover, Germany
| | - Ulrich Kalinke
- Institute for Experimental Infection Research, TWINCORE, Centre for Experimental and Clinical Infection Research, A Joint Venture Between the Helmholtz Centre for Infection Research and Hannover Medical School, Hanover, Germany
- Cluster of Excellence - Resolving Infection Susceptibility (RESIST, EXC 2155), Hannover Medical School, Hanover, Germany
| | - Georg M. N. Behrens
- Department of Rheumatology and Clinical Immunology, Hannover Medical School, Hanover, Germany
- Institute for Experimental Infection Research, TWINCORE, Centre for Experimental and Clinical Infection Research, A Joint Venture Between the Helmholtz Centre for Infection Research and the Hannover Medical School, Hanover, Germany
| | - Rainer Blasczyk
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hanover, Germany
| | - Britta Eiz-Vesper
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hanover, Germany
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5
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Petkova-Tuffy A, Gödecke N, Viotti J, Korte M, Dresbach T. Neuroligin-1 mediates presynaptic maturation through brain-derived neurotrophic factor signaling. BMC Biol 2021; 19:215. [PMID: 34579720 PMCID: PMC8474808 DOI: 10.1186/s12915-021-01145-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 09/01/2021] [Indexed: 12/15/2022] Open
Abstract
Background Maturation is a process that allows synapses to acquire full functionality, optimizing their activity to diverse neural circuits, and defects in synaptic maturation may contribute to neurodevelopmental disorders. Neuroligin-1 (NL1) is a postsynaptic cell adhesion molecule essential for synapse maturation, a role typically attributed to binding to pre-synaptic ligands, the neurexins. However, the pathways underlying the action of NL1 in synaptic maturation are incompletely understood, and some of its previously observed effects seem reminiscent of those described for the neurotrophin brain-derived neurotrophic factor (BDNF). Here, we show that maturational increases in active zone stability and synaptic vesicle recycling rely on the joint action of NL1 and brain-derived neurotrophic factor (BDNF). Results Applying BDNF to hippocampal neurons in primary cultures or organotypical slice cultures mimicked the effects of overexpressing NL1 on both structural and functional maturation. Overexpressing a NL1 mutant deficient in neurexin binding still induced presynaptic maturation. Like NL1, BDNF increased synaptic vesicle recycling and the augmentation of transmitter release by phorbol esters, both hallmarks of presynaptic maturation. Mimicking the effects of NL1, BDNF also increased the half-life of the active zone marker bassoon at synapses, reflecting increased active zone stability. Overexpressing NL1 increased the expression and synaptic accumulation of BDNF. Inhibiting BDNF signaling pharmacologically or genetically prevented the effects of NL1 on presynaptic maturation. Applying BDNF to NL1-knockout mouse cultures rescued defective presynaptic maturation, indicating that BDNF acts downstream of NL1 and can restore presynaptic maturation at late stages of network development. Conclusions Our data introduce BDNF as a novel and essential component in a transsynaptic pathway linking NL1-mediated cell adhesion, neurotrophin action, and presynaptic maturation. Our findings connect synaptic cell adhesion and neurotrophin signaling and may provide a therapeutic approach to neurodevelopmental disorders by targeting synapse maturation. Supplementary Information The online version contains supplementary material available at 10.1186/s12915-021-01145-7.
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Affiliation(s)
- Andonia Petkova-Tuffy
- Institute for Anatomy and Embryology, University Medical Center Göttingen, Kreuzbergring 36, 37075, Göttingen, Germany
| | - Nina Gödecke
- Zoological Institute, Division of Cellular Neurobiology, TU Braunschweig, Spielmannstr. 7, 38106, Braunschweig, Germany
| | - Julio Viotti
- Institute for Anatomy and Embryology, University Medical Center Göttingen, Kreuzbergring 36, 37075, Göttingen, Germany
| | - Martin Korte
- Zoological Institute, Division of Cellular Neurobiology, TU Braunschweig, Spielmannstr. 7, 38106, Braunschweig, Germany.,Helmholtz Centre for Infection Research, Research group Neuroinflammation and Neurodegeneration, Imhoffenstr. 7, 38104, Braunschweig, Germany
| | - Thomas Dresbach
- Institute for Anatomy and Embryology, University Medical Center Göttingen, Kreuzbergring 36, 37075, Göttingen, Germany.
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Körper S, Jahrsdörfer B, Corman VM, Pilch J, Wuchter P, Blasczyk R, Müller R, Tonn T, Bakchoul T, Schäfer R, Juhl D, Schwarz T, Gödecke N, Burkhardt T, Schmidt M, Appl T, Eichler H, Klüter H, Drosten C, Seifried E, Schrezenmeier H. Donors for SARS-CoV-2 Convalescent Plasma for a Controlled Clinical Trial: Donor Characteristics, Content and Time Course of SARS-CoV-2 Neutralizing Antibodies. Transfus Med Hemother 2021; 48:137-147. [PMID: 34177417 PMCID: PMC8216018 DOI: 10.1159/000515610] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 02/28/2021] [Indexed: 12/15/2022] Open
Abstract
Background Convalescent plasma is one of the treatment options for COVID-19 which is currently being investigated in many clinical trials. Understanding of donor and product characteristics is important for optimization of convalescent plasma. Methods Patients who had recovered from COVID-19 were recruited as donors for COVID-19 convalescent plasma (CCP) for a randomized clinical trial of CCP for treatment of severe COVID-19 (CAPSID Trial). Titers of neutralizing antibodies were measured by a plaque-reduction neutralization test (PRNT). Correlation of antibody titers with host factors and evolution of neutralizing antibody titers over time in repeat donors were analysed. Results A series of 144 donors (41% females, 59% males; median age 40 years) underwent 319 plasmapheresis procedures providing a median collection volume of 850 mL and a mean number of 2.7 therapeutic units per plasmapheresis. The majority of donors had a mild or moderate course of COVID-19. The titers of neutralizing antibodies varied greatly between CCP donors (from <1:20 to >1:640). Donor factors (gender, age, ABO type, body weight) did not correlate significantly with the titer of neutralizing antibodies. We observed a significant positive correlation of neutralization titers with the number of reported COVID-19 symptoms and with the time from SARS-CoV-2 diagnosis to plasmapheresis. Neutralizing antibody levels were stable or increased over time in 58% of repeat CCP donors. Mean titers of neutralizing antibodies of first donation and last donation of repeat CCP donors did not differ significantly (1:86 at first compared to 1:87 at the last donation). There was a significant correlation of neutralizing antibodies measured by PRNT and anti-SARS-CoV-2 IgG and IgA antibodies which were measured by ELISA. CCP donations with an anti-SARS-CoV-2 IgG antibody content above the 25th percentile were substantially enriched for CCP donations with higher neutralizing antibody levels. Conclusion We demonstrate the feasibility of collection of a large number of CCP products under a harmonized protocol for a randomized clinical trial. Titers of neutralizing antibodies were stable or increased over time in a subgroup of repeat donors. A history of higher number of COVID-19 symptoms and higher levels of anti-SARS-CoV-2 IgG and IgA antibodies in immunoassays can preselect donations with higher neutralizing capacity.
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Affiliation(s)
- Sixten Körper
- Institute for Clinical Transfusion Medicine and Immunogenetics Ulm, German Red Cross Blood Transfusion Service Baden-Württemberg-Hessen and University Hospital Ulm, Ulm, Germany.,Institute of Transfusion Medicine, University of Ulm, Ulm, Germany
| | - Bernd Jahrsdörfer
- Institute for Clinical Transfusion Medicine and Immunogenetics Ulm, German Red Cross Blood Transfusion Service Baden-Württemberg-Hessen and University Hospital Ulm, Ulm, Germany.,Institute of Transfusion Medicine, University of Ulm, Ulm, Germany
| | - Victor M Corman
- Institute of Virology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health and German Centre for Infection Research, Berlin, Germany
| | - Jan Pilch
- Institute of Clinical Hemostaseology and Transfusion Medicine, University Hospital and University of the Saarland, Homburg, Germany
| | - Patrick Wuchter
- Institute of Transfusion Medicine and Immunology, German Red Cross Blood Transfusion Service Baden-Württemberg-Hessen, Medical Faculty of Medicine Mannheim, University Mannheim, Mannheim, Germany
| | - Rainer Blasczyk
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Rebecca Müller
- Institute of Transfusion Medicine and Immunology, German Red Cross Blood Transfusion Service Baden-Württemberg-Hessen, Medical Faculty of Medicine Mannheim, University Mannheim, Mannheim, Germany
| | - Torsten Tonn
- Experimental Transfusion Medicine, Technical University of Dresden, German Red Cross Blood Transfusion Service Nord-Ost gGmbH Dresden, Dresden, Germany
| | - Tamam Bakchoul
- Institute of Clinical and Experimental Transfusion Medicine, University Hospital Tübingen, Tübingen, Germany
| | - Richard Schäfer
- Institute of Transfusion Medicine and Immunohematology, German Red Cross Blood Transfusion Service Baden-Württemberg - Hessen, Frankfurt, Germany
| | - David Juhl
- Institute of Transfusion Medicine, University Hospital Schleswig-Holstein, Kiel and Lübeck, Germany
| | - Tatjana Schwarz
- Institute of Virology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health and German Centre for Infection Research, Berlin, Germany
| | - Nina Gödecke
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Thomas Burkhardt
- Experimental Transfusion Medicine, Technical University of Dresden, German Red Cross Blood Transfusion Service Nord-Ost gGmbH Dresden, Dresden, Germany
| | - Michael Schmidt
- Institute of Transfusion Medicine and Immunohematology, German Red Cross Blood Transfusion Service Baden-Württemberg - Hessen, Frankfurt, Germany
| | - Thomas Appl
- Institute for Clinical Transfusion Medicine and Immunogenetics Ulm, German Red Cross Blood Transfusion Service Baden-Württemberg-Hessen and University Hospital Ulm, Ulm, Germany.,Institute of Transfusion Medicine, University of Ulm, Ulm, Germany
| | - Hermann Eichler
- Institute of Clinical Hemostaseology and Transfusion Medicine, University Hospital and University of the Saarland, Homburg, Germany
| | - Harald Klüter
- Institute of Transfusion Medicine and Immunology, German Red Cross Blood Transfusion Service Baden-Württemberg-Hessen, Medical Faculty of Medicine Mannheim, University Mannheim, Mannheim, Germany
| | - Christian Drosten
- Institute of Virology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health and German Centre for Infection Research, Berlin, Germany
| | - Erhard Seifried
- Institute of Transfusion Medicine and Immunohematology, German Red Cross Blood Transfusion Service Baden-Württemberg - Hessen, Frankfurt, Germany
| | - Hubert Schrezenmeier
- Institute for Clinical Transfusion Medicine and Immunogenetics Ulm, German Red Cross Blood Transfusion Service Baden-Württemberg-Hessen and University Hospital Ulm, Ulm, Germany.,Institute of Transfusion Medicine, University of Ulm, Ulm, Germany
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7
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Bonifacius A, Tischer-Zimmermann S, Dragon AC, Gussarow D, Vogel A, Krettek U, Gödecke N, Yilmaz M, Kraft ARM, Hoeper MM, Pink I, Schmidt JJ, Li Y, Welte T, Maecker-Kolhoff B, Martens J, Berger MM, Lobenwein C, Stankov MV, Cornberg M, David S, Behrens GMN, Witzke O, Blasczyk R, Eiz-Vesper B. COVID-19 immune signatures reveal stable antiviral T cell function despite declining humoral responses. Immunity 2021; 54:340-354.e6. [PMID: 33567252 PMCID: PMC7871825 DOI: 10.1016/j.immuni.2021.01.008] [Citation(s) in RCA: 145] [Impact Index Per Article: 48.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 11/12/2020] [Accepted: 01/13/2021] [Indexed: 12/15/2022]
Abstract
Cellular and humoral immunity to SARS-CoV-2 is critical to control primary infection and correlates with severity of disease. The role of SARS-CoV-2-specific T cell immunity, its relationship to antibodies, and pre-existing immunity against endemic coronaviruses (huCoV), which has been hypothesized to be protective, were investigated in 82 healthy donors (HDs), 204 recovered (RCs), and 92 active COVID-19 patients (ACs). ACs had high amounts of anti-SARS-CoV-2 nucleocapsid and spike IgG but lymphopenia and overall reduced antiviral T cell responses due to the inflammatory milieu, expression of inhibitory molecules (PD-1, Tim-3) as well as effector caspase-3, -7, and -8 activity in T cells. SARS-CoV-2-specific T cell immunity conferred by polyfunctional, mainly interferon-γ-secreting CD4+ T cells remained stable throughout convalescence, whereas humoral responses declined. Immune responses toward huCoV in RCs with mild disease and strong cellular SARS-CoV-2 T cell reactivity imply a protective role of pre-existing immunity against huCoV.
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Affiliation(s)
- Agnes Bonifacius
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Sabine Tischer-Zimmermann
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Anna C Dragon
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Daniel Gussarow
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Alexander Vogel
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Ulrike Krettek
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Nina Gödecke
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | | | - Anke R M Kraft
- Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, Germany; German Center for Infection Research (DZIF), partner site Hannover-Braunschweig, Germany; Centre for Individualised Infection Medicine (CiiM), Hannover, Germany
| | - Marius M Hoeper
- Department of Pneumology, Hannover Medical School, member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Isabell Pink
- Department of Pneumology, Hannover Medical School, member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Julius J Schmidt
- Department of Kidney and Hypertension Diseases, Hannover Medical School, Hannover, Germany
| | - Yang Li
- Department Computational Biology for Individualised Medicine, Centre for Individualised Infection Medicine (CiiM), Helmholtz Centre for Infection Research, Hannover Medical School, Hannover, Germany
| | - Tobias Welte
- Department of Pneumology, Hannover Medical School, member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Britta Maecker-Kolhoff
- Department of Pediatric Hematology and Oncology, Hannover Medical School, Hannover, Germany
| | - Jörg Martens
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Marc Moritz Berger
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Essen, Essen, Germany
| | - Corinna Lobenwein
- Department of Infectious Diseases, West German Centre of Infectious Diseases, University Hospital Essen, University Duisburg-Essen, Germany
| | - Metodi V Stankov
- German Center for Infection Research (DZIF), partner site Hannover-Braunschweig, Germany; Department of Rheumatology and Clinical Immunology, Hannover Medical School, Hannover, Germany
| | - Markus Cornberg
- Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, Germany; German Center for Infection Research (DZIF), partner site Hannover-Braunschweig, Germany; Centre for Individualised Infection Medicine (CiiM), Hannover, Germany
| | - Sascha David
- Department of Kidney and Hypertension Diseases, Hannover Medical School, Hannover, Germany; Institute of Intensive Care Medicine, University Hospital Zurich, Switzerland
| | - Georg M N Behrens
- German Center for Infection Research (DZIF), partner site Hannover-Braunschweig, Germany; Department of Rheumatology and Clinical Immunology, Hannover Medical School, Hannover, Germany
| | - Oliver Witzke
- Department of Infectious Diseases, West German Centre of Infectious Diseases, University Hospital Essen, University Duisburg-Essen, Germany
| | - Rainer Blasczyk
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Britta Eiz-Vesper
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany.
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8
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Bošnjak B, Stein SC, Willenzon S, Cordes AK, Puppe W, Bernhardt G, Ravens I, Ritter C, Schultze-Florey CR, Gödecke N, Martens J, Kleine-Weber H, Hoffmann M, Cossmann A, Yilmaz M, Pink I, Hoeper MM, Behrens GMN, Pöhlmann S, Blasczyk R, Schulz TF, Förster R. Low serum neutralizing anti-SARS-CoV-2 S antibody levels in mildly affected COVID-19 convalescent patients revealed by two different detection methods. Cell Mol Immunol 2020; 18:936-944. [PMID: 33139905 PMCID: PMC7604543 DOI: 10.1038/s41423-020-00573-9] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 10/07/2020] [Indexed: 12/31/2022] Open
Abstract
Neutralizing antibodies targeting the receptor-binding domain (RBD) of the SARS-CoV-2 spike (S) block severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) entry into cells via surface-expressed angiotensin-converting enzyme 2 (ACE2). We used a surrogate virus neutralization test (sVNT) and SARS-CoV-2 S protein-pseudotyped vesicular stomatitis virus (VSV) vector-based neutralization assay (pVNT) to assess the degree to which serum antibodies from coronavirus disease 2019 (COVID-19) convalescent patients interfere with the binding of SARS-CoV-2 S to ACE2. Both tests revealed neutralizing anti-SARS-CoV-2 S antibodies in the sera of ~90% of mildly and 100% of severely affected COVID-19 convalescent patients. Importantly, sVNT and pVNT results correlated strongly with each other and to the levels of anti-SARS-CoV-2 S1 IgG and IgA antibodies. Moreover, levels of neutralizing antibodies correlated with the duration and severity of clinical symptoms but not with patient age. Compared to pVNT, sVNT is less sophisticated and does not require any biosafety labs. Since this assay is also much faster and cheaper, sVNT will not only be important for evaluating the prevalence of neutralizing antibodies in a population but also for identifying promising plasma donors for successful passive antibody therapy.
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Affiliation(s)
- Berislav Bošnjak
- Institute of Immunology, Hannover Medical School, Hannover, Germany.
| | | | | | | | - Wolfram Puppe
- Institute of Virology, Hannover Medical School, Hannover, Germany
| | - Günter Bernhardt
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Inga Ravens
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | | | - Christian R Schultze-Florey
- Institute of Immunology, Hannover Medical School, Hannover, Germany.,Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
| | - Nina Gödecke
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Jörg Martens
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Hannah Kleine-Weber
- German Primate Center-Leibniz Institute for Primate Research, Göttingen, Germany.,Faculty of Biology and Psychology, University Göttingen, Göttingen, Germany
| | - Markus Hoffmann
- German Primate Center-Leibniz Institute for Primate Research, Göttingen, Germany.,Faculty of Biology and Psychology, University Göttingen, Göttingen, Germany
| | - Anne Cossmann
- Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany
| | | | - Isabelle Pink
- Department of Pneumology and German Centre of Lung Research (DZL), Hannover Medical School, Hannover, Germany
| | - Marius M Hoeper
- Department of Pneumology and German Centre of Lung Research (DZL), Hannover Medical School, Hannover, Germany
| | - Georg M N Behrens
- Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany.,German Center for Infection Research (DZIF), partner site Hannover-Braunschweig, Hannover, Germany
| | - Stefan Pöhlmann
- German Primate Center-Leibniz Institute for Primate Research, Göttingen, Germany.,Faculty of Biology and Psychology, University Göttingen, Göttingen, Germany
| | - Rainer Blasczyk
- Institute of Transfusion Medicine and Transplant Engineering, Hannover Medical School, Hannover, Germany
| | - Thomas F Schulz
- Institute of Virology, Hannover Medical School, Hannover, Germany.,German Center for Infection Research (DZIF), partner site Hannover-Braunschweig, Hannover, Germany.,Cluster of Excellence RESIST (EXC 2155), Hannover Medical School, Hannover, Germany
| | - Reinhold Förster
- Institute of Immunology, Hannover Medical School, Hannover, Germany. .,Cluster of Excellence RESIST (EXC 2155), Hannover Medical School, Hannover, Germany.
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9
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Kellner Y, Gödecke N, Dierkes T, Thieme N, Zagrebelsky M, Korte M. The BDNF effects on dendritic spines of mature hippocampal neurons depend on neuronal activity. Front Synaptic Neurosci 2014; 6:5. [PMID: 24688467 PMCID: PMC3960490 DOI: 10.3389/fnsyn.2014.00005] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 03/01/2014] [Indexed: 01/05/2023] Open
Abstract
The fine tuning of neural networks during development and learning relies upon both functional and structural plastic processes. Changes in the number as well as in the size and shape of dendritic spines are associated to long-term activity-dependent synaptic plasticity. However, the molecular mechanisms translating functional into structural changes are still largely unknown. In this context, neurotrophins, like Brain-Derived Neurotrophic Factor (BDNF), are among promising candidates. Specifically BDNF-TrkB receptor signaling is crucial for activity-dependent strengthening of synapses in different brain regions. BDNF application has been shown to positively modulate dendritic and spine architecture in cortical and hippocampal neurons as well as structural plasticity in vitro. However, a global BDNF deprivation throughout the central nervous system (CNS) resulted in very mild structural alterations of dendritic spines, questioning the relevance of the endogenous BDNF signaling in modulating the development and the mature structure of neurons in vivo. Here we show that a loss-of-function approach, blocking BDNF results in a significant reduction in dendritic spine density, associated with an increase in spine length and a decrease in head width. These changes are associated with a decrease in F-actin levels within spine heads. On the other hand, a gain-of-function approach, applying exogenous BDNF, could not reproduce the increase in spine density or the changes in spine morphology previously described. Taken together, we show here that the effects exerted by BDNF on the dendritic architecture of hippocampal neurons are dependent on the neuron's maturation stage. Indeed, in mature hippocampal neurons in vitro as shown in vivo BDNF is specifically required for the activity-dependent maintenance of the mature spine phenotype.
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Affiliation(s)
- Yves Kellner
- Division of Cellular Neurobiology, Zoological Institute, TU Braunschweig Braunschweig, Germany
| | - Nina Gödecke
- Division of Cellular Neurobiology, Zoological Institute, TU Braunschweig Braunschweig, Germany
| | - Tobias Dierkes
- Division of Cellular Neurobiology, Zoological Institute, TU Braunschweig Braunschweig, Germany
| | - Nils Thieme
- Division of Cellular Neurobiology, Zoological Institute, TU Braunschweig Braunschweig, Germany
| | - Marta Zagrebelsky
- Division of Cellular Neurobiology, Zoological Institute, TU Braunschweig Braunschweig, Germany
| | - Martin Korte
- Division of Cellular Neurobiology, Zoological Institute, TU Braunschweig Braunschweig, Germany
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10
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Kauczok S, Gödecke N, Chichinin AI, Veckenstedt M, Maul C, Gericke KH. Three-dimensional velocity map imaging: setup and resolution improvement compared to three-dimensional ion imaging. Rev Sci Instrum 2009; 80:083301. [PMID: 19725645 DOI: 10.1063/1.3186734] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
For many years the three-dimensional (3D) ion imaging technique has not benefited from the introduction of ion optics into the field of imaging in molecular dynamics. Thus, a lower resolution of kinetic energy as in comparable techniques making use of inhomogeneous electric fields was inevitable. This was basically due to the fact that a homogeneous electric field was needed in order to obtain the velocity component in the direction of the time of flight spectrometer axis. In our approach we superimpose an Einzel lens field with the homogeneous field. We use a simulation based technique to account for the distortion of the ion cloud caused by the inhomogeneous field. In order to demonstrate the gain in kinetic energy resolution compared to conventional 3D Ion Imaging, we use the spatial distribution of H(+) ions emerging from the photodissociation of HCl following the two photon excitation to the V (1)Sigma(+) state. So far a figure of merit of approximately four has been achieved, which means in absolute numbers Delta v/v = 0.022 compared to 0.086 at v approximately = 17,000 m/s. However, this is not a theoretical limit of the technique, but due to our rather short TOF spectrometer (15 cm). The photodissociation of HBr near 243 nm has been used to recognize and eliminate systematic deviations between the simulation and the experimentally observed distribution. The technique has also proven to be essential for the precise measurement of translationally cold distributions.
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Affiliation(s)
- S Kauczok
- Institut für Physikalische und Theoretische Chemie, TU Braunschweig, 38106 Braunschweig, Germany
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11
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Chichinin AI, Shternin PS, Gödecke N, Kauczok S, Maul C, Vasyutinskii OS, Gericke KH. Intermediate state polarization in multiphoton ionization of HCl. J Chem Phys 2006; 125:34310. [PMID: 16863353 DOI: 10.1063/1.2218336] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The paper presents the detailed theoretical description of the intermediate state polarization and photofragment angular distribution in resonance enhanced multiphoton ionization (REMPI) of molecules and the experimental investigation of these effects in the E(1)Sigma(+) and V(1)Sigma(+) states of HCl populated by two-photon transitions. It is shown that the intermediate state polarization can be characterized by the universal parameter b which is in general a complex number containing information about the symmetry of the two-photon excitation and possible phase shifts. The photofragment angular distribution produced by one- or multiphoton excitation of the polarized intermediate state is presented as a product of the intermediate state axis spatial distribution and the angular distribution of the photofragments from an unpolarized intermediate state. Experiments have been carried out by two complementary methods: REMPI absorption spectroscopy of rotationally resolved (E,v'=0<--X,v"=0) and (V,v'=12<--X,v"=0) transitions and REMPI via the Q(0) and Q(1) rotational transitions followed by three-dimensional ion imaging detection. The values of the parameter b determined from experiment manifest the mostly perpendicular nature of the initial two-photon transition. The experimentally obtained H(+) -ion fragment angular distributions produced via the Q(1) rotational transition show good agreement with theoretical prediction.
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Affiliation(s)
- A I Chichinin
- Institut für Physikalische und Theoretische Chemie, Technische Universität Braunschweig, 38106 Braunschweig, Germany
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