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Hagelkruys A, Wirnsberger G, Stadlmann J, Wöhner M, Horrer M, Vilagos B, Jonsson G, Kogler M, Tortola L, Novatchkova M, Bönelt P, Hoffmann D, Koglgruber R, Steffen U, Schett G, Busslinger M, Bergthaler A, Klein C, Penninger JM. A crucial role for Jagunal homolog 1 in humoral immunity and antibody glycosylation in mice and humans. J Exp Med 2021; 218:e20200559. [PMID: 32930709 PMCID: PMC7953624 DOI: 10.1084/jem.20200559] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 07/17/2020] [Accepted: 08/18/2020] [Indexed: 12/28/2022] Open
Abstract
Jagunal homolog 1 (JAGN1) has been identified as a critical regulator of neutrophil biology in mutant mice and rare-disease patients carrying JAGN1 mutations. Here, we report that Jagn1 deficiency results in alterations in the endoplasmic reticulum (ER) of antibody-producing cells as well as decreased antibody production and secretion. Consequently, mice lacking Jagn1 in B cells exhibit reduced serum immunoglobulin (Ig) levels at steady state and fail to mount an efficient humoral immune response upon immunization with specific antigens or when challenged with viral infections. We also demonstrate that Jagn1 deficiency in B cells results in aberrant IgG N-glycosylation leading to enhanced Fc receptor binding. Jagn1 deficiency in particular affects fucosylation of IgG subtypes in mice as well as rare-disease patients with loss-of-function mutations in JAGN1. Moreover, we show that ER stress affects antibody glycosylation. Our data uncover a novel and key role for JAGN1 and ER stress in antibody glycosylation and humoral immunity in mice and humans.
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Affiliation(s)
- Astrid Hagelkruys
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
| | - Gerald Wirnsberger
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
- Apeiron Biologics AG, Vienna, Austria
| | - Johannes Stadlmann
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
- Institute of Biochemistry, University of Natural Resource and Life Sciences, Vienna, Austria
| | - Miriam Wöhner
- Research Institute of Molecular Pathology, Vienna Biocenter, Vienna, Austria
| | - Marion Horrer
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
| | - Bojan Vilagos
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Gustav Jonsson
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
| | - Melanie Kogler
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
| | - Luigi Tortola
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
- Institute of Molecular Health Sciences, ETH Zurich, Zurich, Switzerland
| | - Maria Novatchkova
- Research Institute of Molecular Pathology, Vienna Biocenter, Vienna, Austria
| | - Peter Bönelt
- Research Institute of Molecular Pathology, Vienna Biocenter, Vienna, Austria
| | - David Hoffmann
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
| | - Rubina Koglgruber
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
| | - Ulrike Steffen
- Department of Internal Medicine 3-Rheumatology and Immunology, Friedrich-Alexander-University Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
| | - Georg Schett
- Department of Internal Medicine 3-Rheumatology and Immunology, Friedrich-Alexander-University Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
| | - Meinrad Busslinger
- Research Institute of Molecular Pathology, Vienna Biocenter, Vienna, Austria
| | - Andreas Bergthaler
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Christoph Klein
- Department of Pediatrics, Dr. von Hauner Children’s Hospital, Ludwig Maximilians University, Munich, Germany
| | - Josef M. Penninger
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna, Austria
- Department of Medical Genetics, Life Science Institute, University of British Columbia, Vancouver, Canada
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