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McCann 2012 J Neurochem

From Bioblast
Publications in the MiPMap
McCann KA, Williams DW, McKee EE (2012) Metabolism of deoxypyrimidines and deoxypyrimidine antiviral analogs in isolated brain mitochondria. J Neurochem 122:126-37.

» PMID: 22530558 Open Access

McCann Kathleen A, Williams David W, McKee Edward E (2012) J Neurochem

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.

© 2012 The Authors. Journal of Neurochemistry © 2012 International Society for Neurochemistry.

Bioblast editor: Plangger M O2k-Network Lab: US MI Mt Pleasant McKee E


Labels: MiParea: Respiration 


Organism: Rat  Tissue;cell: Nervous system  Preparation: Isolated mitochondria 


Coupling state: OXPHOS  Pathway:HRR: Oxygraph-2k 

2021-10