Abstract
The demonstration that Abs to adhesion molecules can block tumor metastasis suggested their use for therapy. However, such Abs affect nonmalignant cells as well. To circumvent this adverse effect, we proposed the use of bispecific Abs that bind simultaneously to an adhesion receptor and to a tumor-specific Ag. Such bifunctional Abs bind more avidly to tumor cells that coexpress both target Ags than to normal cells. The Id of the surface Ig of malignant B lymphocytes is a tumor-specific Ag. Therefore, we produced bispecific Abs with specificity to the adhesion molecule, CD44, and to an idiotypic determinant of the murine B cell lymphoma, 38C-13. These anti-Id x anti-CD44 bispecific Abs blocked 38C-13 cell adhesion to hyaluronic acid, while not affecting adhesion of Id-negative cells. In vivo studies demonstrated that the bispecific Abs inhibited lymphoma cell dissemination to the lymph nodes, bone marrow, and spleen, and prolonged survival of tumor-bearing mice. Migration of 38C-13 cells to the lymphoid organs was inhibited by the bispecific Abs. Thus, the bispecific Ab-mediated reduction in metastasis resulted, at least in part, from reduced homing to these organs. In contrast to anti-CD44 monospecific Abs, the anti-Id x anti-C...Continue Reading
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