Hd. Dong et al., B7-H1, a third member of the B7 family, co-stimulates T-cell proliferationand interleukin-10 secretion, NAT MED, 5(12), 1999, pp. 1365-1369
Citations number
23
Categorie Soggetti
Research/Laboratory Medicine & Medical Tecnology","Medical Research General Topics
The B7 family members B7-1 and B7-2 interact with CD28 and constitute an es
sential T-cell co-stimulatory pathway in the initiation of antigen-specific
humoral and cell-mediated immune response. Here, we describe a third membe
r of the B7 family, called B7-H1 that does not bind CD28, cytotoxic T-lymph
ocyte A4 or ICOS (inducible co-stimulator). Ligation of B7-H1 co-stimulated
T-cell responses to polyclonal stimuli and allogeneic antigens, and prefer
entially stimulated the production of interleukin-10. Interleukin-2, althou
gh produced in small amounts, was required for the effect of B7-H1 co-stimu
lation. Our studies thus define a previously unknown co-stimulatory molecul
e that may be involved in the negative regulation of cell-mediated immune r
esponses.