Direct, DNA pol-gamma-independent effects of nucleoside reverse transcriptase inhibitors on mitochondrial bioenergetics.

Abstract:

:Nucleoside reverse transcriptase inhibitor (NRTI)-induced cardiomyopathy has been suggested to reflect mitochondrial targets of drug toxicity. The prevailing hypothesis is that, through structural mimicry, the NRTIs are mistaken as substrates for DNA polymerase and incorporated into replicating DNA, where they cause truncation of the elongating strand. Although there exist five forms of nuclear DNA polymerase, mitochondria possess solely DNA polymerase-gamma (pol-gamma), which is a preferred target for most NRTIs. Consequently, mitochondria are particularly susceptible to inhibition of DNA replication by the NRTIs, which is consistent with the phenotype of mitochondrial depletion and metabolic failure in affected patients. However, the DNA pol-gamma hypothesis by itself fails to explain the entire array of metabolic deficiencies associated with NRTI-induced disorders. In this article, we review the published literature regarding the direct effects of NRTIs on various mitochondrial targets and suggest the possibility that the initiating event in NRTI-induced cardiomyopathy is a direct mitochondrial toxicity rather than inhibition of mitochondrial DNA pol-gamma. The goal of this review is to encourage a discussion of the cause of NRTI-induced mitochondrial cardiomyopathy to include a fresh consideration of all possible targets and integrating pathways that are involved in establishing mitochondrial bioenergetic fidelity and metabolic capacity in the affected myocardium.

journal_name

Cardiovasc Toxicol

authors

Lund KC,Wallace KB

doi

10.1385/ct:4:3:217

keywords:

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

217-28

issue

3

eissn

1530-7905

issn

1559-0259

pii

CT:4:3:217

journal_volume

4

pub_type

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