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Related Experiment Videos

Alternative strategy for stress tolerance: opioids.

Joan Smith Sonneborn1, Henry Gottsch, Eric Cubin

  • 1Department of Zoology & Physiology, University of Wyoming, Laramie 82071-3166, USA. cancun@uwyo.edu

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|May 5, 2004
PubMed
Summary

Hibernation-related compounds, including Deltorphin D, reduced stress markers in a rat heart attack model. This suggests potential new treatments for heart attack and stroke by modulating opioid pathways.

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Area of Science:

  • Cardiovascular Science
  • Neuroscience
  • Molecular Biology

Background:

  • Endogenous opioids are linked to stress tolerance.
  • Hibernating tissues exhibit remarkable stress tolerance.
  • Opioid pathways may play a role in cellular stress responses.

Purpose of the Study:

  • To investigate the potential of opioid-mimicking compounds and hibernation-associated serum as ischemic preconditioning agents.
  • To evaluate the effect of these agents on stress-related gene expression in a cardiac ischemia model.

Main Methods:

  • An in vivo rat model of surgically induced cardiac ischemia was used.
  • Serum from hibernating (HIT) and non-hibernating (SWAP) woodchucks, DADLE, and Deltorphin D were administered as preconditioning agents.
  • Northern blot analysis measured polyubiquitin and HSP70 transcript levels in ischemic cardiac tissue.

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Main Results:

  • Deltorphin D and HIT significantly reduced polyubiquitin transcript expression by 2.1-fold and 1.4-fold, respectively.
  • SWAP and DADLE showed no significant difference compared to saline controls.
  • The effect of Deltorphin D was inhibited by glibenclamide, a K(ATP) channel blocker.
  • No inducible HSP70 was detected.

Conclusions:

  • Opioid modulation of the ubiquitin stress pathway offers a novel therapeutic target.
  • Deltorphin D and HIT demonstrate potential as preconditioning agents for ischemic events.
  • These findings may inform the development of interventions for myocardial infarction and stroke.