Cited by 857Cancer Immunotherapy and BiomarkersT-cell and B-cell ImmunologyMonoclonal and Polyclonal Antibodies Research

The DOI matches its Crossref record; 46 of the 46 references it cites were found in a registry or an index.

Anti-CTLA-4 Antibodies of IgG2a Isotype Enhance Antitumor Activity through Reduction of Intratumoral Regulatory T Cells

Selby, Mark J., Engelhardt, John J., Quigley, Michael, Henning, Karla A., Chen, Timothy, Srinivasan, Mohan, Korman, Alan J.·2013·Cancer Immunology Research

Published version of a preprint

Abstract

Antitumor activity of CTLA-4 antibody blockade is thought to be mediated by interfering with the negative regulation of T-effector cell (Teff) function resulting from CTLA-4 engagement by B7-ligands. In addition, a role for CTLA-4 on regulatory T cells (Treg), wherein CTLA-4 loss or inhibition results in reduced Treg function, may also contribute to antitumor responses by anti-CTLA-4 treatment. We have examined the role of the immunoglobulin constant region on the antitumor activity of anti-CTLA-4 to analyze in greater detail the mechanism of action of anti-CTLA-4 antibodies. Anti-CTLA-4 antibody containing the murine immunoglobulin G (IgG)2a constant region exhibits enhanced antitumor activity in subcutaneous established MC38 and CT26 colon adenocarcinoma tumor models compared with anti-CTLA-4 containing the IgG2b constant region. Interestingly, anti-CTLA-4 antibodies containing mouse IgG1 or a mutated mouse IgG1-D265A, which eliminates binding to all Fcγ receptors (FcγR), do not show antitumor activity in these models. Assessment of Teff and Treg populations at the tumor and in the periphery showed that anti-CTLA-4-IgG2a mediated a rapid and dramatic reduction of Tregs at the tumor site, whereas treatment with each of the isotypes expanded Tregs in the periphery. Expansion of CD8+ Teffs is observed with both the IgG2a and IgG2b anti-CTLA-4 isotypes, resulting in a superior Teff to Treg ratio for the IgG2a isotype. These data suggest that anti-CTLA-4 promotes antitumor activity by a selective reduction of intratumoral Tregs along with concomitant activation of Teffs. Cancer Immunol Res; 1(1); 32–42. ©2013 AACR.

Overview

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Crossref · 10.1158/2326-6066.cir-13-0013

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46 of 46 references verified0 citation errors · 0 not checkable

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  • Anti-CTLA-4 antibodies deplete intratumoral Tregs, possibly through antibody-dependent cell-mediated cytotoxicity, leading to enhanced anti-tumor responses.

    “Anti- CTLA-4antibodies have been shown to deplete intratumoral Tregs, possibly through antibody-dependent cell-mediated cytotoxicity, leading to enhanced anti-tumor responses [120].”

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Metadata

Authors
Selby, M. J., Engelhardt, J. J., Quigley, M., Henning, K. A., Chen, T., Srinivasan, M., & Korman, A. J.
Affiliations
  • Bristol-Myers Squibb (United States) (US)
  • Authors' Affiliation: Bristol-Myers Squibb Company, Redwood City, California
Venue
Cancer Immunology Research
Published
2013-07-01
Volume
1
Issue
1
Pages
32-42
ISSN
  • 2326-6066 (ISSN-L)
  • 2326-6074
OpenAlex
W2101581360
Cited by
857
References
46
Citations by year
2026: 23 · 2025: 40 · 2024: 52 · 2023: 63 · 2022: 79 · 2021: 80 · 2020: 92 · 2019: 89 · 2018: 79 · 2017: 69 · 2016: 73 · 2015: 57 · 2014: 46 · 2013: 14
FWCI
33.87
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer Immunology Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Immunology and Microbiology › Immunology › Monoclonal and Polyclonal Antibodies Research
Keywords
anti-CTLA-4 antibody, CTLA-4, antibody isotypes, regulatory T cells, CD8+ effector T cells, Fcγ receptor binding, colon adenocarcinoma, tumor immunology, immune checkpoint blockade
MeSH terms
Animals, Antibodies, Monoclonal, Colonic Neoplasms, Cricetulus, Disease Models, Animal, Female, Immunoglobulin G, Mice, Inbred BALB C, Mice, Inbred C57BL, Random Allocation, CHO Cells, T-Lymphocytes, Regulatory, Mice, CTLA-4 Antigen

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