PMID: 1203891May 1, 1975Paper

Action of Cis-dichlorodiammineplatinum(II) (NSC-119875) at ehe cellular level

Cancer Chemotherapy Reports. Part 1
B Drewinko, J A Gottlieb

Abstract

Asynchronous human lymphoma cells treated for 1 hour with increasing concentrations of cis-dichlorodiammineplatinum(II) revealed a marked decrease in survival as estimated by the colony-forming technique. When the treatmentwas extended for 8 hours at a concentration of 5micrograms/ml, a killing effect (greater than 3 log decades) was observed which was similar to that obtained when 50micrograms/ml is incubated with the cells for 1 hour. This finding suggests that better antitumor effects with fewer toxic effects may be obtained clinically by prolonged infusion of low doses of cis-dichlorodiammineplatinum (II). Synchronized lymphoma cells showed no significant degree of cell-cycle-stage sensitivity to cis-dichlorodiammineplatinum (II). The drug kills cells with similar efficiency in all stages of the cell cycle. No killing effect was elicited after incubation of the cells with spironolactone, a compound said to protect the kidneys from the toxic effects of heavy metals. However, simultaneous incubation of spironolactone and cis-dichlorodiammineplatinum (II) did not prevent the lethal action of the second drug. If spironolactone is proven to be an inhibitor of cis-dichlorodiammineplatinum (II) nephrotoxicity, it will become a val...Continue Reading

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