B7-2: a CTLA4/CD28 ligand

Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives

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530350, 935 9, C07H 2100, C07K 14705, C12N 1512

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active

059426071

ABSTRACT:
Isolated nucleic acids encoding novel CTLA4/CD28 ligands which costimulate T cell activation are disclosed. In one embodiment, the isolated nucleic acid has a sequence which encodes a B lymphocyte activation antigen, B7-2. Preferably, the nucleic acid is a DNA molecule comprising at least a portion of a nucleotide sequence shown in FIG. 8, SEQ ID NO: 1. The nucleic acid sequences of the invention can be integrated into various expression vectors, which in turn can direct the synthesis of the corresponding proteins or peptides in a variety of hosts, particularly eukaryotic cells, such as mammalian and insect cell culture. Also disclosed are host cells transformed to produce proteins or peptides encoded by the nucleic acid sequences of the invention and isolated proteins and peptides which comprise at least a portion of a novel B lymphocyte antigen.

REFERENCES:
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V.A. Boussiotis et al. PNAS 90:11059-63 Dec. 1, 1993.
G.J. Freeman et al. Science 262:909 Nov. 5, 1993.
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Reiser et al., "Murine B7 antigen provides an efficient costimulatory signal activation of murine T lymphocytes via T cell receptor/CD3 complex" Proceedings of the National Academy of Sciences, vol. 89, pp. 271-275, (1992).
Freeman et al., "Structure, Expression, and T Cell Costimulatory Activity of the Murine Homologue of the Human B Lymphocyte Activation Antigen B7" Journal Experimental Medicine, vol. 174, pp. 625-631, (1991).
Gimmi et al., "B-cell surface antigen B7 provides a costimulatory signal that induces T cells to proliferate and secrete interleukin 2" Proceedings of the National Academy of Sciences, vol. 88, pp. 6575-6579, (1991).
Linsley et al., "Binding of the B Cell Activation Antigen B7 to CD28 Costimulates T Cell Proliferation and Interleukin 2 mRNA Accumulation" Journal Experimental Medicine, vol. 173, pp. 721-730, (1991).
Freeman et al., "B7, A New Member of the Ig Superfamily with Unique Expression on Activated and Neoplastic B Cells" Journal of Immunology, vol. 143, No. 8, pp 2714-2722, (1989).
Thompson et al., "CD28 activation pathway regulates the production of multiple T-cell derived lymphokines/cytokines" Proceedings of the National Academy of Sciences, vol. 86, pp. 1333-1337, (1989).
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