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Amgen Inc., Thousand Oaks, CA 91320
Inducible costimulator (ICOS) and B7-related protein-1 (B7RP-1)
constitute a receptor-ligand pair involved in T cell costimulation. In
this study, the stimulatory effects of B7RP-1 on cellular and humoral
immune responses were investigated giving mice a construct with the
extracellular domain of murine B7RP-1 fused with human IgG1 Fc
(B7RP-1-Fc). B7RP-1-Fc stimulated contact hypersensitivity (CH) given
near either the time of sensitization or challenge with oxazolone. When
given near challenge time, B7RP-1-Fc stimulated CH more than a
construct containing the extracellular domain of murine B7.2 and Fc
(B7.2-Fc). B7RP-1-Fc increased the number of cells in lymph nodes
draining the skin sensitized with oxazolone, especially activated T
cells. B7RP-1-Fc also increased the ability of the cells in these lymph
nodes to induce CH when transfused into naive mice. B7RP-1-Fc
stimulated the production of anti-keyhole limpet hemocyanin (KLH)
Ab, increasing anti-KLH IgG, IgG2a, and IgE, whereas B7.2-Fc did
not affect this production. B7RP-1-Fc also increased the number of
cells in lymph nodes draining the skin immunized with KLH and their
production of IFN-
, IL-4, and IL-10 in response to KLH. Finally,
B7RP-1-Fc increased the presence of eosinophils in the bronchoalveolar
lavage and lungs of mice sensitized and challenged with OVA so to mount
an asthmatic reaction. B7RP-1-Fc stimulates both cellular and humoral
immune responses in vivo by increasing number and function of T and B
cells reacting to Ag exposure.
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