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M94A0213.TXT
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1994-10-08
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Document 0213
DOCN M94A0213
TI Inhibition of ribonucleotide reductase by 2'-substituted deoxycytidine
analogs: possible application in AIDS treatment.
DT 9412
AU Bianchi V; Borella S; Calderazzo F; Ferraro P; Chieco Bianchi L;
Reichard P; Department of Biology, University of Padova, Italy.
SO Proc Natl Acad Sci U S A. 1994 Aug 30;91(18):8403-7. Unique Identifier :
AIDSLINE MED/94359939
AB 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.
DE Acquired Immunodeficiency Syndrome/*DRUG THERAPY Antiviral Agents
Cells, Cultured Comparative Study Cytidine/ANALOGS &
DERIVATIVES/PHARMACOLOGY Deoxycytidine/*ANALOGS &
DERIVATIVES/PHARMACOLOGY/THERAPEUTIC USE Human
Hydroxyurea/PHARMACOLOGY In Vitro Prodrugs Ribonucleotide
Reductases/*ANTAGONISTS & INHIB Support, Non-U.S. Gov't
Zidovudine/*ADMINISTRATION & DOSAGE/METABOLISM JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).