Lipopolysaccharide induces oxidative cardiac mitochondrial damage and biogenesis - PubMed (original) (raw)
Lipopolysaccharide induces oxidative cardiac mitochondrial damage and biogenesis
Hagir B Suliman et al. Cardiovasc Res. 2004.
Abstract
Objective: The responses to bacterial lipopolysaccharide (LPS) damage mitochondria by generating oxidative stress within the organelles. We postulated that LPS damages heart mitochondrial DNA and protein by oxidation, and that this is recovered by oxidative mechanisms of mitochondrial biogenesis.
Methods and results: Systemic crude E. coli LPS administration decreased mtDNA copy number and mtDNA gene transcription in rat heart caused by oxidant deletion of mtDNA. The fall in copy number was reflected in proteomic expression of several mitochondria-encoded subunits of Complexes I, IV, and V. Recovery of mtDNA copy number involved biogenesis as indicated by mitochondrial transcription factor A (Tfam) and DNA polymerase-gamma expression. The transcriptional response also included nuclear accumulation of peroxisome proliferator-activated receptor-gamma co-activator 1 (PGC-1) and mRNA expression for redox-regulated nuclear respiratory factors (NRF-1 and -2).
Conclusions: These novel findings disclose a duality of reactive oxygen species (ROS) effect in the heart's response to LPS in which oxidative mitochondrial damage is opposed by oxidant stimulation of biogenesis.
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