Biological and Pharmaceutical Bulletin p. 480 - 483 (1996)
Update date:2022-08-11
Topics:
Nagata, Shunji
Masuda, Kazuyoshi
Nogusa, Hideo
Hirano, Koichiro
Takagishi, Yasushi
The effect of lysosomal enzyme inhibition on the cytotoxic activity of an immunoconjugate composed of anti-α-fetoprotein monoclonal antibody and vindesine analog (VDS) was studied in vitro using human tumor clonogenic assay (HTCA). Addition of the lysosome enzyme inhibitors, leupeptin and ammonium chloride, to the HTCA system had little influence on the cytotoxicity of this immunoconjugate. In separate experiments, no released VDS was detected by HPLC after incubation with the supernatant of rat liver homogenate without inhibitor. These results show that the immunoconjugate may bypass the lysosomal process and exert its activity as an intact or similar form.
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