Abstract：
:Immunotoxins directed against human transferrin receptor have been evaluated in a nude mouse model of human malignant mesothelioma. Immunotoxins were constructed by linking ricin A chain to murine monoclonal antibodies reactive with the human transferrin receptor. A chain was obtained either by isolation from the parent toxin or by recombinant DNA techniques. These immunotoxins acted as potent in vitro cytotoxins against human malignant mesothelioma cells (H-MESO-1) (ID50, 2 X 10(-9) M). Cytotoxic potency and kinetics of cell kill were potentiated in vitro by the carboxylic ionophore monensin. For in vivo trials, nude mice were injected i.p. with 6-9 X 10(6) human malignant mesothelioma cells 24 h prior to the start of i.p. immunotoxin treatments. The survival of tumor-bearing mice was extended by 149-404%, representing a probable cell kill of 2-4 logs. Specificity of this antitransferrin receptor immunotoxin response was confirmed by the ineffectiveness of irrelevant control immunotoxins and blockade of specific immunotoxin action by excess free antibody. Monensin showed limited in vivo potentiation of immunotoxin effect, but a derivative formed by esterification of monensin with linoleic acid gave improved survival times over treatment with immunotoxin alone. Immunotoxins constructed with ricin A chain have significant tumoricidal activity in this model of regional antitumor therapy. These results may have direct relevance for treatment of i.p. malignancy in clinical settings.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Griffin TW,Richardson C,Houston LL,LePage D,Bogden A,Raso Vsubject
Has Abstractpub_date
1987-08-15 00:00:00pages
4266-70issue
16eissn
0008-5472issn
1538-7445journal_volume
47pub_type
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