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Clinical studies of idiotype (Id) vaccination in patients with lymphoma have established a correlation between the induced anti-Id antibody responses and favorable clinical outcomes. To streamline the production of an Id vaccine, we engineered a small diabody (Db) molecule containing both a B-cell-targeting moiety (anti-CD19) and a lymphoma Id. This molecule (αCD19-Id) was designed to penetrate lymph nodes and bind to noncognate B cells to form an antigen presentation array. Indeed, the αCD19-Id molecule accumulated on B cells in vivo after s.c. administration. These noncognate B cells, decorated with the diabody, could then stimulate the more rare Id-specific B cells. Peptide epitopes present in the diabody linker augmented the response by activating CD4(+) helper T cells. Consequently, the αCD19-Id molecule induced a robust Id-specific antibody response and protected animals from tumor challenge. Such diabodies are produced in a cell-free protein expression system within hours of amplification of the specific Ig genes from the B-cell tumor. This customized product can now be available to vaccinate patients before they receive other, potentially immunosuppressive, therapies.

A vaccine directed to B cells and produced by cell-free protein synthesis generates potent antilymphoma immunity