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Immunotherapy has considerable potential in the treatment of cancer. Here we report on the uptake of an antibody raised against the CCK-B/Gastrin receptor (CCK-BR) by liver embryonic and liver tumor cell lines. In all five cell lines studied, expression of CCK-BR and uptake of labeled anti-CCK-BR antibody was observed. The labeled anti-CCK-BR antibody was localized in both the cytoplasm and nucleus of cells. In addition, we found a coincidence between the uptake of the labeled antibody by cells and the occurrence of apoptosis (cell death). The results suggest that antibodies directed against CCK-BR have potential for targeting and possibly destroying tumor cells bearing the receptor.

Endocytosis of Anti-CCK-B/Gastrin Receptor Antibody and Effect on Hepatoma Cell Lines