B7h, a novel costimulatory homolog of B7.1 and B7.2, is induced by TNFalpha - PubMed (original) (raw)
Comparative Study
B7h, a novel costimulatory homolog of B7.1 and B7.2, is induced by TNFalpha
M M Swallow et al. Immunity. 1999 Oct.
Free article
Abstract
In a screen to identify genes induced by NF-kappaB/Rel transcription factors, we cloned a novel gene, b7h, that is a close homolog of B7 costimulatory ligands expressed on antigen-presenting cells. B7h can costimulate proliferation of purified T cells through a receptor on T cells distinct from CD28 or CTLA-4. Surprisingly, although B7h is expressed in unstimulated B cells, its expression is induced in both 3T3 cells and embryonic fibroblasts treated with TNFalpha, and it is upregulated in nonlymphoid tissues of mice treated with LPS, a potent activator of TNFalpha. These data define a novel costimulatory ligand for T cells and suggest that induction of B7h by TNFalpha may function as a mechanism to directly augment recognition of self during inflammation.
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