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From the * Malaghan Institute of Medical Research, Wellington School of Medicine, Wellington, New
Zealand; and CD80 and CD86 (B7-1 and B7-2) are the ligands on antigen-presenting cells (APCs) which
bind CD28 and deliver the costimulatory signals necessary for T cell activation. The reasons for
the existence of two CD28 binding molecules are not well understood. We created a mutant
version of CTLA4-Ig that could selectively bind CD80 and block CD28-CD80 interaction but
leave CD28-CD86 binding intact. CD80 blockade prevented antigen-induced accumulation
of eosinophils and lymphocytes in the lung of immunized mice, but did not block antigen induced systemic blood eosinophilia or IgE antibody production. No preferential expression of
CD80 could be demonstrated on a population of lung APC consisting mainly of macrophages.
These results indicate that CD80 costimulation is not necessary for the induction of Th2 immune
responses but rather for the maintenance or amplification of lung inflammatory responses.
Bristol-Myers Squibb Pharmaceutical Research Institute, Seattle, Washington 98121
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