Cited by 43Monoclonal and Polyclonal Antibodies ResearchCellular transport and secretionDrug Transport and Resistance Mechanisms

Cell surface dynamics and cellular distribution of endogenous FcRn

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D’Hooghe, Lena, Chalmers, Andrew D., Heywood, Sam, Whitley, Paul·2017·PLOS ONE

Abstract

A major role for FcRn is the salvage of pinocytosed IgG and albumin from a degradative fate in lysosomes. FcRn achieves this by binding IgG in a pH-dependent manner in acidic endosomes and recycling it to the plasma membrane to be released at neutral pH. This is important in maintaining high serum IgG and albumin levels and has the potential to be exploited to modulate the pharmacokinetics of antibody-based therapeutics. Although FcRn is responsible for the recycling of IgG, the dynamic behaviour of endogenous FcRn is not well understood. Our data shows that the majority of endogenous receptor is distributed throughout the endosomal system and is present only at a low percentage on the plasma membrane at steady state. A significant fraction of FcRn at the cell surface appears to be endocytosis resistant while the remainder can undergo rapid endocytosis. To maintain surface levels of the receptor, endocytosed FcRn is replaced with FcRn from the internal pool. This unexpected complexity in FcRn cell surface dynamics has led us to propose a model for FcRn trafficking that should be taken into account when targeting FcRn at the cell surface for therapeutic purposes.

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Crossref · 10.1371/journal.pone.0182695

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  • FcRn expression is dynamically regulated and broadly distributed throughout the uptake/endosomal pathway, although most evidence demonstrates that only a small fraction sits at the cell surface at any one point in time.

    “our understanding is that FcRn expression is dynamically regulated and broadly distributed throughout the uptake/endosomal pathway, although most evidence demonstrates that only a small fraction sits at the cell surface at any one point in time [13–16].”

    From The uptake, intracellular trafficking and recycling of FcRn-blocking therapeutics in human endothelial cells in vitro (2026) · cites this paper as [13]

    The Discussion reports that endogenous FcRn is distributed throughout the endosomal system in HepG2 cells and that approximately 4–7% is at the cell surface. It also describes dynamic trafficking between surface and internal pools, but does not establish that FcRn expression itself is dynamically regulated; the authors say that a signal mobilising intracellular FcRn has yet to be identified. (LLM, conf=0.85)

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Authors
D’Hooghe, L., Chalmers, A. D., Heywood, S., & Whitley, P.
Affiliations
  • UCB Pharma (United Kingdom) (GB)
  • University of Bath (GB)
Corresponding author
  • Heywood, Sam
  • Whitley, Paul
Venue
PLOS ONE
Published
2017-08-17
Volume
12
Issue
8
Pages
e0182695
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2745739499
Cited by
42
References
41
Citations by year
2025: 9 · 2024: 5 · 2023: 4 · 2022: 6 · 2021: 9 · 2020: 2 · 2019: 4 · 2018: 3
FWCI
1.89
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • University of Bath
  • UCB Pharma
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Monoclonal and Polyclonal Antibodies Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
Keywords
neonatal Fc receptor, cell surface dynamics, receptor trafficking, endocytosis, IgG recycling, endosomal system, plasma membrane, antibody pharmacokinetics
MeSH terms
Cell Membrane, Endocytosis, Humans, Receptors, Fc, Histocompatibility Antigens Class I, Protein Transport, Hep G2 Cells

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