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- A Sato and J G Cory.
- Cancer Res. 1981 May 1; 41 (5): 1637-41.
AbstractThe nature of the inhibition of Ehrlich tumor cell ribonucleotide reductase by combinations of agents directed at the non-heme iron-containing component and the effector-binding component was studied with the use of isobolograms. From these studies, it was determined that the combinations of pyrazoloimidazole (IMPY) and dialdehyde of inosine, IMPY and deoxyguanosine triphosphate (dGTP), IMPY and deoxyadenosine triphosphate (dATP), and IMPY and deoxythymidine triphosphate (dTTP) gave synergistic inhibition of cytidine diphosphate reductase. The combination of dATP and dGTP also gave synergistic inhibition. The combinations of hydroxyurea and IMPY, 4-methyl-5-aminoisoquinoline thiosemicarbazone (MAIQ) and IMPY, and dialdehyde of inosine and dialdehyde derivative of 5'-deoxyinosine gave antagonistic inhibition. Other combinations utilizing MAIQ and dATP, MAIQ and dGTP, MAIQ and dTTP, hydroxyurea and dGTP, and hydroxyurea and dTTP gave inhibition which was additive.
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