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Tumor Cell Biology Section, Clinical Pharmacology Branch, National Cancer Institute, NIH, Bethesda, Maryland 20892
The benzoquinonoid ansamycin antibiotics herbimycin A and geldanamycin have been shown to reverse the oncogenic phenotype of pp60vsrc transformed cells as well as induce differentiation in a number of in vitro model systems, reportedly due to their inhibition of src family protein tyrosine kinases. We now report that these agents are potent cytotoxins in vitro against a panel of highly malignant human tumor cell lines possessing primitive neural features. Proliferation and/or survival of fibroblasts, primary neuronal cultures, and several leukemia cell lines are unaffected at concentrations resulting in >99% cell loss in sensitive lines. The tumorigenicity in nude mice of sensitive cell lines can also be markedly reduced by either systemic or topical administration of these agents without apparent toxicity to the whole animal. The cytocidal action of these ansamycins is initiated very rapidly, is irreversible, and is clearly distinct from the delayed inhibition of src family kinases that has been reported previously. Due to their potency, relative selectivity, and novel mechanism(s) of action, these drugs could prove clinically useful in the therapy of a number of human cancers of neural derivation.
1 To whom requests for reprints should be addressed, at Pediatric Branch, National Cancer Institute, Building 10, Room 13N240, Bethesda, MD 20892.
Received 10/ 8/91. Accepted 1/23/92.
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