Cited by 1,685T-cell and B-cell ImmunologyImmunotherapy and Immune ResponsesCancer Immunotherapy and Biomarkers

CTLA-4 is a second receptor for the B cell activation antigen B7.

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Linsley, P S, Brady, W, Urnes, M, Grosmaire, L S, Damle, N K, Ledbetter, J A·1991·The Journal of experimental medicine

Abstract

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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Authors
Linsley, P. S., Brady, W., Urnes, M., Grosmaire, L. S., Damle, N. K., & Ledbetter, J. A.
Affiliations
Bristol-Myers Squibb (United States) (US)
Venue
The Journal of experimental medicine
Published
1991-09-01
Volume
174
Issue
3
Pages
561-569
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
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
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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