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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1994 Aug 30;91(18):8403–8407. doi: 10.1073/pnas.91.18.8403

Inhibition of ribonucleotide reductase by 2'-substituted deoxycytidine analogs: possible application in AIDS treatment.

V Bianchi 1, S Borella 1, F Calderazzo 1, P Ferraro 1, L Chieco Bianchi 1, P Reichard 1
PMCID: PMC44614  PMID: 8078894

Abstract

After phosphorylation to the corresponding diphosphates, 2'-azido-2'-deoxycytidine and 2'-difluorocytidine act as powerful inhibitors of ribonucleotide reductase. Phosphorylation requires deoxycytidine kinase, an enzyme with particularly high activity in lymphoid cells. Therefore, the deoxycytidine analogs can be expected to inhibit the reductase with some specificity for the lymphoid system. Pretreatment of human CEM lymphoblasts with the analogs considerably increased the phosphorylation of 3'-deoxy-3'-azidothymidine (AzT). The increased phosphorylation of AzT is caused by a prolongation of the S phase of the cell cycle. Our results suggest the possibility of a combination of 2'-substituted deoxycytidine analogs with AzT in the treatment of AIDS. Gao et al. [Gao, W.-Y., Cara, A., Gallo, R. C. & Lori, F. (1993) Proc. Natl. Acad. Sci. USA 90, 8925-8928] have suggested the use of the ribonucleotide reductase inhibitor hydroxyurea for this purpose, since the resulting decrease in the size of deoxyribonucleotide pools decreases the processivity of the HIV reverse transcriptase. From our results it would appear that the 2'-substituted deoxycytidine analogs might be preferable to hydroxyurea.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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