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Metabolism of deoxypyrimidines and deoxypyrimidine antiviral analogs in isolated brain mitochondria
Author(s) -
McCann Kathleen A.,
Williams David W.,
McKee Edward E.
Publication year - 2012
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.2012.07765.x
Subject(s) - thymidine , mitochondrion , zidovudine , phosphorylation , nucleoside , biochemistry , deoxyuridine , thymidine kinase , biology , pyrimidine , stavudine , deoxycytidine kinase , nucleotide , chemistry , deoxycytidine , dna , virology , virus , genetics , chemotherapy , herpes simplex virus , gemcitabine , viral disease , gene
J. Neurochem. (2012) 122 , 126–137. Abstract The goal of this project was to characterize deoxypyrimidine salvage pathways used to maintain deoxynucleoside triphosphate pools in isolated brain mitochondria and to determine the extent that antiviral pyrimidine analogs utilize or affect these pathways. Mitochondria from rat brains were incubated in media with labeled and unlabeled deoxynucleosides and deoxynucleoside analogs. Products were analyzed by HPLC coupled to an inline UV monitor and liquid scintillation counter. Isolated mitochondria transported thymidine and deoxycytidine into the matrix, and readily phosphorylated both of these to mono‐, di‐, and tri‐phosphate nucleotides. Rates of phosphorylation were much higher than rates observed in mitochondria from heart and liver. Deoxyuridine was phosphorylated much more slowly than thymidine and only to dUMP. 3′‐azido‐3′‐deoxythymidine, zidovudine (AZT), an antiviral thymidine analog, was phosphorylated to AZT‐MP as readily as thymidine was phosphorylated to TMP, but little if any AZT‐DP or AZT‐TP was observed. AZT at 5.5 ± 1.7 μM was shown to inhibit thymidine phosphorylation by 50%, but was not observed to inhibit deoxycytidine phosphorylation except at levels > 100 μM. Stavudine and lamivudine were inert when incubated with isolated brain mitochondria. The kinetics of phosphorylation of thymidine, dC, and AZT were significantly different in brain mitochondria compared to mitochondria from liver and heart.