Competition for FcRn-mediated transport gives rise to short half-life of human IgG3 and offers therapeutic potential
Open accessAbstract
Human IgG3 displays the strongest effector functions of all IgG subclasses but has a short half-life for unresolved reasons. Here we show that IgG3 binds to IgG-salvage receptor (FcRn), but that FcRn-mediated transport and rescue of IgG3 is inhibited in the presence of IgG1 due to intracellular competition between IgG1 and IgG3. We reveal that this occurs because of a single amino acid difference at position 435, where IgG3 has an arginine instead of the histidine found in all other IgG subclasses. While the presence of R435 in IgG increases binding to FcRn at neutral pH, it decreases binding at acidic pH, affecting the rescue efficiency—but only in the presence of H435–IgG. Importantly, we show that in humans the half-life of the H435-containing IgG3 allotype is comparable to IgG1. H435–IgG3 also gave enhanced protection against a pneumococcal challenge in mice, demonstrating H435–IgG3 to be a candidate for monoclonal antibody therapies. The half-life of IgG is regulated by binding to the neonatal Fc receptor and, in the case of IgG3, is reduced compared to other IgG proteins. In this study, a mutation in IgG3 is shown to reduce binding to the neonatal Fc receptor, which can be competitively blocked by IgG1.
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In human serum, FcRn prolongs the half-life of IgG1, IgG2, and IgG4 equally.
“In human serum, FcRn prolongs the half-life of IgG1, IgG2, and IgG4 equally.”
From Factors Affecting the FcRn-Mediated Transplacental Transfer of Antibodies and Implications for Vaccination in Pregnancy (2017) · cites this paper as [66]
FcRn does not prolong the half-life of IgG3 in the same way because IgG3 has an arginine at position 435 instead of the histidine found in the other subclasses, except for individuals expressing a natural IgG3 variant (H435).
“It is thought that FcRn does not prolong the half-life of IgG3 in the same way, because IgG3 has an arginine at position 435 instead of the histidine found at the same position in the other subclasses, except for individuals expressing a natural IgG3 variant (H435) (66).”
From Factors Affecting the FcRn-Mediated Transplacental Transfer of Antibodies and Implications for Vaccination in Pregnancy (2017) · cites this paper as [66]
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- Authors
- Stapleton, N. M., Andersen, J. T., Stemerding, A. M., Bjarnarson, S. P., Verheul, R. C., Gerritsen, J., Zhao, Y., Kleijer, M., Sandlie, I., de Haas, M., Jonsdottir, I., van der Schoot, C. E., & Vidarsson, G.
- Affiliations
- Amsterdam UMC Location University of Amsterdam (NL)
- Oslo University Hospital (NO)
- University Medical Center Utrecht (NL)
- Utrecht University (NL)
- University of Oslo (NO)
- Corresponding author
- Vidarsson, Gestur
- Venue
- Nature Communications
- Published
- 2011-12-20
- Volume
- 2
- Issue
- 1
- Pages
- 599-599
- ISSN
- 2041-1723 (ISSN-L)
- PMC
- PMC3247843
- OpenAlex
- W2018187711
- Cited by
- 286
- References
- 54
- Citations by year
- 2026: 10 · 2025: 19 · 2024: 30 · 2023: 27 · 2022: 22 · 2021: 27 · 2020: 15 · 2019: 25 · 2018: 16 · 2017: 21 · 2016: 15 · 2015: 19 · 2014: 17 · 2013: 16 · 2012: 6
- FWCI
- 9.55
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Nature Communications (publishedVersion, cc-by-nc-nd)
- Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Pure Amsterdam UMC (submittedVersion)
- NORA - Norwegian Open Research Archives (submittedVersion, cc-by-nc-nd)
- Hirsla (Landspítali University Hospital) (submittedVersion)
- Funders
- Landsteiner Foundation for Blood Transfusion Research
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (015.001.083)
- Norges Forskningsråd (179573)
- Helse Sør-Øst RHF (39375)
- Topics
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Monoclonal and Polyclonal Antibodies Research
- Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
- Life Sciences › Immunology and Microbiology › Immunology › Immunodeficiency and Autoimmune Disorders
- Keywords
- IgG3, IgG1, neonatal Fc receptor, antibody half-life, monoclonal antibody therapy, effector function
- MeSH terms
- Agammaglobulinemia, Animals, Antibodies, Monoclonal, Arginine, Binding, Competitive, Disease Models, Animal, Half-Life, Histidine, Humans, Hydrogen-Ion Concentration, Immunoglobulin G, Pneumococcal Infections, Protein Binding, Receptors, Fc, Streptococcus pneumoniae, Histocompatibility Antigens Class I, Amino Acid Substitution, Protein Transport, Cell Line, Tumor, Mice, Molecular Targeted Therapy
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