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Remote Limb Ischemic Preconditioning: A Neuroprotective Technique in Rodents
07:52

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Published on: June 2, 2015

Cardioprotection from remote preconditioning involves spinal opioid receptor activation.

Gordon Tin Chun Wong1, Yao Lu, Bin Mei

  • 1Department of Anaesthesiology, University of Hong Kong, Hong Kong SAR, China. gordon@hku.hk

Life Sciences
|September 18, 2012
PubMed
Summary
This summary is machine-generated.

Spinal opioid receptors are crucial for transmitting signals in remote preconditioning (RIPC and RPOT), but not classic ischemic preconditioning (IPC). This suggests the central nervous system relays these cardioprotective signals.

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Area of Science:

  • Cardiovascular Physiology
  • Neuroscience
  • Cellular Biology

Background:

  • Remote preconditioning offers cardioprotection but its transmission mechanisms are unclear.
  • Investigating spinal opioid receptors' role in remote preconditioning signal transmission is essential for clinical applications.

Purpose of the Study:

  • To test if spinal opioid receptors mediate signal transmission in remote cardiac preconditioning.
  • To differentiate the role of spinal opioid receptors in remote ischemic preconditioning (RIPC) and remote preconditioning of trauma (RPOT) versus classic ischemic preconditioning (IPC).

Main Methods:

  • Utilized two remote preconditioning models: RIPC (lower limb ischemia) and RPOT (cutaneous pain fiber stimulation).
  • Administered intrathecal naloxone methiodide to selectively block spinal opioid receptors, avoiding the blood-brain barrier.
  • Assessed cardioprotection by measuring infarct size after ischemia-reperfusion, comparing with IPC.

Main Results:

  • Spinal opioid receptor blockade with naloxone methiodide abolished the cardioprotective effects of RIPC and RPOT.
  • Cardioprotection from classic IPC remained unaffected by naloxone methiodide.
  • Specific mu-opioid receptor antagonists blocked the protective response, while delta and kappa antagonists did not.

Conclusions:

  • The central nervous system, specifically at the spinal cord level, is involved in relaying signals for remote preconditioning.
  • Mu-opioid receptors in the spinal cord play a key role in mediating the cardioprotective effects of RIPC and RPOT.