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CTLA-4 is a second receptor for the B cell activation antigen B7.
Open accessAbstract
Functional interactions between T and B lymphocytes are necessary for optimal activation of an immune response. Recently, the T lymphocyte receptor CD28 was shown to bind the B7 counter-receptor on activated B lymphocytes, and subsequently to costimulate interleukin 2 production and T cell proliferation. CTLA-4 is a predicted membrane receptor from cytotoxic T cells that is homologous to CD28 and whose gene maps to the same chromosomal band as the gene for CD28. It is not known, however, if CD28 and CTLA-4 also share functional properties. To investigate functional properties of CTLA-4, we have produced a soluble genetic fusion between the extracellular domain of CTLA-4 and an immunoglobulin C gamma chain. Here, we show that the fusion protein encoded by this construct, CTLA4Ig, bound specifically to B7-transfected Chinese hamster ovary cells and to lymphoblastoid cells. CTLA4Ig also immunoprecipitated B7 from cell surface 125I-labeled extracts of these cells. The avidity of 125I-labeled B7Ig fusion protein for immobilized CTLA4Ig was estimated (Kd approximately 12 nM). Finally, we show that CTLA4Ig was a potent inhibitor of in vitro immune responses dependent upon cellular interactions between T and B lymphocytes. These findings provide direct evidence that, like its structural homologue CD28, CTLA-4 is able to bind the B7 counter-receptor on activated B cells. Lymphocyte interactions involving the B7 counter-receptor are functionally important for alloantigen responses in vitro.
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“Once TCR signaling is induced, intracellularly stored CTLA-4 molecules traffic to the cell surface, where they can bind and compete for the same ligands as CD28, but with greater affinity, thereby dampening costimulation (7,8).”
From Immune Checkpoint Inhibitors for the Treatment of Cancer: Clinical Impact and Mechanisms of Response and Resistance (2021) · cites this paper as [8]
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“CTLA-4 binds the B7 complex with greater affinity, especially CD80, than CD28, blocking CD28-B7 interaction and suppressing T-cell stimulation.(23) CTLA-4 engagement on effector T cells (T eff ) induces tryptophan catabolism, thereby downregulating their activity and reducing T-cell proliferation.”
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“Although it is presented on the T cell surface at a lower density than CD28, CTLA-4 has a » 20-fold higher aYnity for the B7 ligand [35].”
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“After induction by the major histocompatibility complex (MHC), PD-L1 can bind to CD28 and CTLA-4 (inhibitory receptors) on the surface of activated T cells and then inhibit T cell activation and proliferation (37, 38).”
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“It has been proposed that the negative signal delivered by CTLA-4 on T cells, where it is mainly present as an intracellular protein, but transiently exposed on the surface of activated T cells [7], is due to its high affinity binding for B7-1/B7-2 ligands [8] on antigen-presenting cells [9,10], thus interfering in th…”
BackgroundBiologic and advanced immunomodulating therapeutic options for sarcoidosis: a clinical update
Obi, O. N., Lower, E. E., & Baughman, R. P. (2021) · Expert Review of Clinical Pharmacology · doi:10.1080/17512433.2021.1878024 · Cited by 20
“It binds more avidly to CD80 than CD86 on antigen-presenting cells and results in reduced T-cell activation [405,415].”
BackgroundB7-H3: another molecule marker for Mo-DCs?
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Abatacept Does Not Induce Direct Gene Expression Changes in Antigen-Presenting Cells
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“Abatacept is a soluble fusion protein combining the Fc portion of IgG1 and CTLA4 which prevents the binding of CD28 to CD80/CD86 molecule [2].”
BackgroundSignaling Amplification at the Immunological Synapse
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Metadata
- Authors
- Linsley, P. S., Brady, W., Urnes, M., Grosmaire, L. S., Damle, N. K., & Ledbetter, J. A.
- Affiliations
- Bristol-Myers Squibb (United States) (US)
- ORCID
- Linsley, P S
- Venue
- The Journal of experimental medicine
- Publisher
- Rockefeller University Press
- Published
- 1991-09-01
- Volume
- 174
- Issue
- 3
- Pages
- 561-569
- ISSN
- 0022-1007 (ISSN-L)
- 1540-9538
- PMC
- PMC2118936
- OpenAlex
- W2087013294
- Cited by
- 1,685
- References
- 41
- Citations by year
- 2026: 14 · 2025: 31 · 2024: 49 · 2023: 37 · 2022: 35 · 2021: 49 · 2020: 51 · 2019: 55 · 2018: 49 · 2017: 49 · 2016: 59 · 2015: 52 · 2014: 39 · 2013: 41 · 2012: 39
- FWCI
- 27.78
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Journal of Experimental Medicine (publishedVersion)
- PubMed Central (publishedVersion, cc-by-nc-sa)
- PubMed (publishedVersion)
- Funders
- Bristol-Myers Squibb
- Topics
- Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
- Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
- Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
- Keywords
- CTLA-4, B7, CD28, T cell costimulation, B cell activation, T cell-B cell interaction, soluble receptor, interleukin-2, alloantigen response, cytotoxic T lymphocytes
- MeSH terms
- Abatacept, Amino Acid Sequence, Animals, Antigens, Differentiation, Antigens, Surface, B-Lymphocytes, Base Sequence, Cell Line, Ligands, Lymphocyte Cooperation, Lymphocyte Activation, Molecular Sequence Data, Oligonucleotides, Precipitin Tests, Receptors, Immunologic, Recombinant Fusion Proteins, T-Lymphocytes, Antigens, CD, B7-1 Antigen, Immunoconjugates, CTLA-4 Antigen, In Vitro Techniques
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