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The adverse cardiopulmonary phenotype of caveolin-1 deficient mice is mediated by a dysfunctional endothelium

Carsten Wunderlich1, Kristin Schober, Alexander Schmeisser

  • 1University of Technology Dresden, Department of Medicine and Cardiology, Medical Clinic, Fetscherstr. 76, Dresden 01307, Germany. carstenwunderlich@gmx.de

Journal of Molecular and Cellular Cardiology
|April 18, 2008
PubMed

Insights

Loss of caveolin-1 causes heart and lung disease by uncoupling eNOS enzyme activity from its cofactor BH(4), leading to oxidative stress. BH(4) supplementation reversed these defects in caveolin-1 deficient mice.

Area of Science:

  • Cardiovascular Biology
  • Pulmonary Medicine
  • Molecular Mechanisms

Background:

  • Caveolin-1 deficiency (cav-1(-/-)) in mice leads to severe heart failure and lung fibrosis.
  • Caveolin-1 regulates endothelial nitric oxide synthase (eNOS); its absence causes eNOS hyperactivation.
  • The precise molecular mechanisms underlying these pathologies in cav-1(-/-) mice remain unclear.

Purpose of the Study:

  • To investigate the role of endothelial nitric oxide synthase (eNOS) dysfunction in the cardiopulmonary pathologies of caveolin-1 deficient mice.
  • To determine if altered tetrahydrobiopterin (BH(4)) levels contribute to eNOS dysfunction in cav-1(-/-) mice.
  • To evaluate the therapeutic potential of BH(4) supplementation in ameliorating these conditions.

Main Methods:

  • Assessment of eNOS activity and tetrahydrobiopterin (BH(4)) levels in cav-1(-/-) mice.
  • Evaluation of oxidative stress markers in cardiac and pulmonary tissues.
  • Administration of BH(4) or tetrahydroneopterin to cav-1(-/-) mice and subsequent analysis of cardiac function and lung phenotype.
  • Measurement of BH(4)/BH(2) ratio.

Main Results:

  • Cav-1 deficiency enhanced eNOS activity but did not increase vascular BH(4) levels, creating a stoichiometric imbalance.
  • This imbalance led to dysfunctional eNOS signaling and increased oxidative stress, causing cardiac and pulmonary defects.
  • BH(4) donation normalized the BH(4)/BH(2) ratio, reduced oxidative stress, and significantly improved heart function and lung pathology.
  • Tetrahydroneopterin showed no significant therapeutic effect.

Conclusions:

  • Dysfunctional, uncoupled eNOS signaling due to a BH(4) deficiency is central to the cardiopulmonary phenotype in cav-1(-/-) mice.
  • Oxidative stress resulting from this uncoupled eNOS is the primary driver of cardiac and pulmonary defects.
  • BH(4) supplementation represents a promising therapeutic strategy for cardiovascular and pulmonary pathologies linked to eNOS dysfunction.

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