Oxidative insult specifically decreases levels of a mitochondrial transcript

Absract—The effects of oxidative insult, applied with hydrogen peroxide, on gene transcript levels in a human lymphocyte cell line (Molt-17) were investigated using mRNA differential display. Several cDNA fragments corresponding to putatively up- or down-regulated transcripts were isolated. One of t...

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Bibliographic Details
Published in:Free radical biology & medicine 1999-03, Vol.26 (5), p.646-655
Main Authors: Elliott, Ruan M, Southon, Sue, Archer, David B
Format: Article
Language:English
Subjects:
Adenosine Triphosphatases - genetics
ATPase
beta Carotene - pharmacology
Cell Line
Cell Survival - drug effects
DNA, Complementary
DNA, Mitochondrial - genetics
Dose-Response Relationship, Drug
Free radical
Glutathione - metabolism
Glutathione Disulfide - metabolism
Humans
Hydrogen Peroxide - pharmacology
Kinetics
Lymphocytes
Mitochondria - drug effects
Mitochondria - genetics
Mitochondria - metabolism
Mitochondrial transcription
Oxidative Stress
Post-transcriptional processing
RNA, Messenger - genetics
Transcription, Genetic - drug effects
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Summary:Absract—The effects of oxidative insult, applied with hydrogen peroxide, on gene transcript levels in a human lymphocyte cell line (Molt-17) were investigated using mRNA differential display. Several cDNA fragments corresponding to putatively up- or down-regulated transcripts were isolated. One of these was found to hybridize to two discrete transcripts on Northern blots of Molt-17 cell RNA. The more abundant transcript, that has previously been demonstrated to correspond to the mRNA for mitochondrial ATPase subunits 8 and 6, was unaffected by the hydrogen peroxide treatment. In contrast, levels of the rarer, larger transcript were consistently reduced in a rapid, sustained, and dose-dependent manner following hydrogen peroxide treatment. Prior supplementation of the cells with beta carotene provided some protection against the reduction in levels of this transcript following hydrogen peroxide treatment. In contrast, vitamins C and E had no effect at the concentrations tested. We have now cloned the cDNA corresponding to this stress-responsive transcript and demonstrated that it is an incompletely processed product of the mitochondrial genome encompassing ATPase subunits 8 and 6 plus the adjacent gene for cytochrome c oxidase subunit 3. This decrease in one specific mitochondrial transcript may represent a novel mechanism for differential expression of mitochondrially-encoded genes.
ISSN:0891-5849
1873-4596
DOI:10.1016/S0891-5849(98)00235-4