Format

Send to

Choose Destination
See comment in PubMed Commons below
Heart Dis. 2003 Sep-Oct;5(5):308-12.

The activation pattern of the antioxidant enzymes in the right ventricle of rat in response to pressure overload is of heart failure type.

Author information

  • 1Laboratory of Experimental Cardiovascular Physiopathology and Pharmacology (I.F.R. No 100), Faculties of Medicine and Pharmacy, University of Burgundy, 21079 Dijon, France.

Abstract

In the left ventricle subjected to pressure overload activity, the antioxidant enzymes increased at the hyperfunctional stage. During the transition to heart failure, these enzymes are down-regulated, oxidative stress increases, and apoptosis progresses. Maladaptative activation of the antioxidant enzymes at an early stage may contribute to the intrinsic vulnerability of right ventricle to pressure overload. The authors studied changes in expression and activity of the enzymes manganese and copper-zinc superoxide dismutases, glutathione peroxidase, and catalase in the right ventricle of rat following induction of pulmonary hypertension by injection of monocrotaline. Increase in the manganese superoxide dismutase was delayed to the late failing stage, activity of glutathione peroxidase was depressed throughout, and only catalase was activated at the early stage before returning to control levels. This inability to activate antioxidant enzymes may contribute to the deleterious consequences of pressure overload on right ventricle systolic function.

[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Loading ...
    Write to the Help Desk