Abstract
Alkyldeoxyuridines which differ from thymidine by a C5 substitution of straight or branched alkyl chains of two to six carbon atoms have been tested for their ability to be taken up, phosphorylated, and incorporated into DNA. Analysis of the uptake of 5-ethyl-2'-deoxyuridine and 5-propyl-2'-deoxyuridine (n-PrdU)--similar to both thymidine and 5-bromo-2'-deoxyuridine--indicates that transport is dependent upon a functional cellular thymidine kinase. All of the aforementioned pyrimidines with the exception of n-PrdU are phosphorylated to the triphosphate and incorporated into DNA. The homologs 5-iso-propyl-2'-deoxyuridine (iso-PrdU) and 5-hexyl-2'-deoxyuridine are neither transported into the cell, phosphorylated, nor incorporated into DNA. These analogs were tested (i) for their ability to induce in the absence of dimethyl sulfoxide and (ii) to determine whether they enhance or inhibit dimethyl sulfoxide-induced differentiation of Friend erythroleukemia cells. Inhibition of erythroid differentiation appears to require the incorporation of thymidine analogs into DNA, and thus only 5-ethyl-2'-deoxyuridine and 5-bromo-2'-deoxyuridine were effective in inhibiting dimethyl sulfoxide-induced differentiation. The observation that iso-PrdU, and to a lesser extent n-PrdU and 5-propyldeoxyuridine monophosphate, induce differentiation under conditions in which they are not detectable intracellularly is strong evidence that this class of inducer acts at the cell membrane.
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Selected References
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