Cited by 110Monoclonal and Polyclonal Antibodies ResearchProtein purification and stabilityBiosimilars and Bioanalytical Methods

Effects of altered FcγR binding on antibody pharmacokinetics in cynomolgus monkeys

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Leabman, Maya K, Meng, Y Gloria, Kelley, Robert F, DeForge, Laura E, Cowan, Kyra J, Iyer, Suhasini·2013·mAbs

Abstract

Antibody interactions with Fcγ receptors (FcγRs), like FcγRIIIA, play a critical role in mediating antibody effector functions and thereby contribute significantly to the biologic and therapeutic activity of antibodies. Over the past decade, considerable work has been directed towards production of antibodies with altered binding affinity to FcγRs and evaluation of how the alterations modulate their therapeutic activity. This has been achieved by altering glycosylation status at N297 or by engineering modifications in the crystallizable fragment (Fc) region. While the effects of these modifications on biologic activity and efficacy have been examined, few studies have been conducted to understand their effect on antibody pharmacokinetics (PK). We present here a retrospective analysis in which we characterize the PK of three antibody variants with decreased FcγR binding affinity caused by amino acid substitutions in the Fc region (N297A, N297G, and L234A/L235A) and three antibody variants with increased FcγRIIIA binding affinity caused by afucosylation at N297, and compare their PK to corresponding wild type antibody PK in cynomolgus monkeys. For all antibodies, PK was examined at a dose that was known to be in the linear range. Since production of the N297A and N297G variants in Chinese hamster ovary cells results in aglycosylated antibodies that do not bind to FcγRs, we also examined the effect of expression of an aglycosylated antibody, without sequence change(s), in E. coli. All the variants demonstrated similar PK compared with that of the wild type antibodies, suggesting that, for the six antibodies presented here, altered FcγR binding affinity does not affect PK.

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Authors
Leabman, M. K., Meng, Y. G., Kelley, R. F., DeForge, L. E., Cowan, K. J., & Iyer, S.
Affiliations
Genentech (US)
Corresponding author
Leabman, Maya K
Venue
mAbs
Published
2013-11
Volume
5
Issue
6
Pages
896-903
ISSN
  • 1942-0862 (ISSN-L)
  • 1942-0870
OpenAlex
W2083545980
Cited by
110
References
35
Citations by year
2026: 5 · 2025: 9 · 2024: 11 · 2023: 11 · 2022: 12 · 2021: 9 · 2020: 4 · 2019: 10 · 2018: 9 · 2017: 9 · 2016: 10 · 2015: 7 · 2014: 4
FWCI
5.42
Type
journal article
Language
en
Open access
Locations
  • mAbs (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Monoclonal and Polyclonal Antibodies Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein purification and stability
  • Life Sciences › Immunology and Microbiology › Immunology › Biosimilars and Bioanalytical Methods
Keywords
antibody pharmacokinetics, FcγRIIIa, afucosylation, Macaca fascicularis, antibody effector functions
MeSH terms
Animals, Antibodies, Monoclonal, Dose-Response Relationship, Drug, Enzyme-Linked Immunosorbent Assay, Cricetinae, Macaca fascicularis, Protein Binding, Receptors, Fc, Genetic Variation

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