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Triazenes - Chemical, Biological, and Clinical Aspects (Paperback, Softcover reprint of the original 1st ed. 1990)
Loot Price: R1,461
Discovery Miles 14 610
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Triazenes - Chemical, Biological, and Clinical Aspects (Paperback, Softcover reprint of the original 1st ed. 1990)
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More than 25 years have elapsed since the development of the
seminal idea which led to the synthesis of dimethyl triazenes as
antitumor agents. The original suggestion of Shealy et ale was to
use 4-imidazone-carboxarnide as the carrier of a nitro-
gen-containing cytotoxic function. 5-diazoimidazole-4-carbox- amide
(diazo-IC) was synthesized and tested in mice as a potential
inhibitor of de novo purine biosynthesis. Its lack of antitumor
action was attributed to its polarity and to the resulting poor
uptake of this hydrophilic chemical. Diazo-IC was then coupled with
dimethylamine, yielding 5, (3,3-dimethyl-
l-triazeno)imidazole-4-carboxamide) (DTIC) with the intention of
obtaining a less polar and more lipophil~c prod rug which might
release diazo-IC intracellularly. Preliminary tests showed that
DTIC had good antiumor activity in experimental systems. Further
tests demonstrated a broad spectrum of action against rodent
tumors, and clinical trials indicated activity against human
malignancies. Subsequent clinical use of DTIC has demonstrated its
usefulness against malignant melanoma, for which it is currently
the drug of choice, and its effective- ness in combination
chemotherapy in the treatment of other human cancers. Because of
its antitumor activity the mechan- ism of action of DTIC has been
investigated in some detail. The original rationale for its
development, that is, the hydrolysis in vivo to diazo-IC, has been
shown not to be in- volved in th-e-mechansims of action. DTIC
requires metabolic acti- vation before it exerts its biological
effects.
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