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Related Experiment Videos

Adenosine release upon spinal cord injury.

D J McAdoo1, G Robak, G Y Xu

  • 1Marine Biomedical Institute, University of Texas Medical Branch, Galveston 77555-1069, USA. djmcadoo@utmb.edu

Brain Research
|April 28, 2000
PubMed
Summary

Spinal cord injury (SCI) releases adenosine, but it does not block the release of neurotoxic amino acids. Therefore, endogenous adenosine is not neuroprotective after SCI.

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Area of Science:

  • Neuroscience
  • Neurotrauma
  • Pharmacology

Background:

  • Spinal cord injury (SCI) triggers complex biochemical responses.
  • Adenosine is a neuromodulator with potential neuroprotective roles.
  • The precise role of adenosine in SCI pathophysiology remains unclear.

Purpose of the Study:

  • To investigate the hypothesis that adenosine release after SCI offers neuroprotection.
  • To determine if adenosine modulates the release of excitatory amino acids post-SCI.

Main Methods:

  • Microdialysis was used to measure extracellular adenosine and amino acid levels following contusion SCI in rats.
  • Pharmacological agents, including adenosine receptor antagonists (theophylline, 8-cyclopentyl-1,3-dipropylxanthine), were administered.
  • Excitatory amino acid (glutamate) administration was used to assess adenosine release.

Main Results:

  • Substantial adenosine release (up to 100 microM) was detected immediately after SCI.
  • SCI also caused significant excitatory amino acid release.
  • Adenosine receptor antagonists did not affect excitatory amino acid release.
  • Administered glutamate did not significantly increase adenosine release compared to injury.

Conclusions:

  • Endogenous adenosine release following SCI does not appear to inhibit the release of neurotoxic amino acids.
  • The findings suggest that adenosine is not neuroprotective by blocking excitatory amino acid release in the context of SCI.

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