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Related Experiment Videos

Increased superoxide and vascular dysfunction in CuZnSOD-deficient mice.

Sean P Didion1, Michael J Ryan, Lisa A Didion

  • 1Department of Internal Medicine, Cardiovascular Center, The University of Iowa College of Medicine, Iowa City, Iowa 52242-1081, USA.

Circulation Research
|November 16, 2002
PubMed
Summary

Loss of copper-zinc superoxide dismutase (CuZnSOD) in mice increased superoxide levels and impaired blood vessel function. This highlights CuZnSOD

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Area of Science:

  • Biochemistry
  • Physiology
  • Vascular Biology

Background:

  • Increased superoxide contributes to vascular dysfunction in various diseases.
  • Superoxide dismutase (SOD) enzymes mitigate superoxide levels.
  • The specific role of CuZnSOD in blood vessels remains unclear.

Purpose of the Study:

  • To investigate the functional significance of copper-zinc superoxide dismutase (CuZnSOD) in the vasculature.
  • To determine if CuZnSOD deficiency leads to increased superoxide and altered vascular responsiveness.

Main Methods:

  • Comparison of CuZnSOD-deficient (CuZnSOD(-/-)) mice with wild-type (CuZnSOD(+/+)) littermates.
  • Measurement of total SOD activity and CuZnSOD protein levels in aortic tissue.
  • Quantification of vascular superoxide using lucigenin chemiluminescence and hydroethidine confocal microscopy.

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  • Assessment of carotid artery relaxation and contraction responses.
  • Evaluation of cerebral arteriole dilation in vivo.

    • Main Results:

    • CuZnSOD(-/-) mice exhibited ~60% lower total SOD activity and absent CuZnSOD protein in the aorta.
    • Vascular superoxide levels were approximately 2-fold higher in CuZnSOD(-/-) mice.
    • Impaired relaxation to acetylcholine and nitric oxide was observed in CuZnSOD(-/-) carotid arteries.
    • Enhanced contractile responses to phenylephrine and serotonin were noted in CuZnSOD(-/-) mice.
    • Reduced in vivo dilation of cerebral arterioles to acetylcholine was found in CuZnSOD(-/-) mice.

    Conclusions:

    • CuZnSOD plays a crucial role in limiting superoxide levels in blood vessels under basal conditions.
    • CuZnSOD deficiency results in increased oxidative stress and significant alterations in vascular responsiveness.
    • These findings underscore the importance of CuZnSOD in maintaining vascular health.