Abstract:
:Diethyldithiocarbamate (DDTC) has been shown to inhibit nephrotoxicity induced by cis-platinum (DDP) without inhibition of tumor response in the rat. We report here that DDTC at doses of 25-300 mg/kg inhibits DDP-induced nephrotoxicity and bone marrow toxicity in C57BL/6 X DBA/2F1 (hereafter called B6D2F1) mice, F344 rats, and beagle dogs and is also antiemetic in the dog. DDTC doses which afford excellent protection do not decrease median survival time following DDP treatment in L1210 and P388 leukemias, B16 melanoma, and Lewis lung and colon 26 carcinomas in B6D2F1 mice when DDTC is given 2 h after DDP. Preliminary experiments indicate that DDTC does not alter median survival time after treatment of P388 leukemia with the platinum analogues diammine(1,1-cyclobutanedicarboxylato)platinum(II) and cis-diisopropylamine-cis-dichloro-trans-dihydroxyplatinum(IV ). Maximum blood urea nitrogen levels after DDP treatment are reduced significantly by DDTC in all species; blood urea nitrogen elevation, total kidney platinum, weight loss, and leukopenia correlate with DDP-DDTC interval in the rat and indicate optimum protection at 2 h, the shortest interval examined. Bone marrow toxicity was assessed by peripheral white blood cell counts in all species and by marrow cellularity in the mouse. White blood cell nadirs were higher and bone marrow recovered more rapidly after DDTC compared with DDP given alone. DDP reduced marrow cellularity 50-60% in the mouse; administration of DDTC 2 h after DDP afforded no protection to the lymphocytes in the marrow but maintained the granulocyte + precursor population near control levels. DDTC plasma pharmacokinetic values have been determined after s.c., i.p., and i.v. administration in the mouse, rat, and dog. Peak plasma levels of 0.3-1.2 mM are observed after a 250-mg/kg dose, with a plasma half-life of 10-20 min. Our data indicate that DDTC may provide protection against most clinically significant toxicities arising from cis-platinum at doses which do not inhibit tumor response.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Bodenner DL,Dedon PC,Keng PC,Katz JC,Borch RFsubject
Has Abstractpub_date
1986-06-01 00:00:00pages
2751-5issue
6eissn
0008-5472issn
1538-7445journal_volume
46pub_type
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