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Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...

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Downregulation of peroxisome proliferator-activated receptor-alpha gene expression in a mouse model of ischemic

Oliver Dewald1, Saumya Sharma, Julia Adrogue

  • 1Division of Cardiology, Department of Internal Medicine, University of Texas Houston Medical School, 6431 Fannin St, MSB 1.246, Houston, TX 77030, USA.

Circulation
|July 13, 2005
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Downregulation of PPARalpha prevents cardiac lipotoxicity during repetitive ischemia. This adaptive mechanism protects heart function by managing metabolic changes and gene expression in ischemic cardiomyopathy.

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Area of Science:

  • Cardiovascular Biology
  • Metabolic Regulation
  • Molecular Cardiology

Background:

  • Peroxisome proliferators-activated receptor-alpha (PPARalpha) regulates cardiac fatty acid metabolism and substrate preference.
  • Metabolic gene expression during repetitive ischemia/reperfusion (I/R) is not well understood.
  • PPARalpha's role in maintaining contractile function during I/R was investigated.

Purpose of the Study:

  • To investigate the role of PPARalpha downregulation in repetitive I/R-induced cardiac dysfunction.
  • To determine if reactive oxygen species regulate PPARalpha in this model.
  • To assess the adaptive significance of PPARalpha downregulation in preventing cardiac lipotoxicity.

Main Methods:

  • A mouse model of repetitive I/R was established.
  • Mice overexpressing extracellular superoxide dismutase (EC-SOD) and treated with a PPARalpha agonist were studied.
  • Echocardiography, histology, and gene expression analysis were performed.

Main Results:

  • Repetitive I/R downregulated PPARalpha-regulated genes and myosin heavy chain isoforms, which was reversible.
  • EC-SOD overexpression prevented this downregulation.
  • Reactivating PPARalpha worsened contractile function and induced lipotoxicity.

Conclusions:

  • Reactive oxygen species mediate metabolic and myosin isoform gene expression changes in repetitive I/R.
  • PPARalpha downregulation is an adaptive mechanism protecting ischemic myocardium from lipotoxicity.