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Effect of spinal cord stimulation on tactile hypersensitivity in mononeuropathic rats is potentiated by simultaneous GABABand adenosine receptor activation

Neuroscience Letters
Publication Date
DOI: 10.1016/s0304-3940(98)00324-3
  • Photochemically-Induced Neuropathy
  • Allodynia
  • Baclofen
  • R-Pia
  • Spinal Cord Stimulation
  • Chemistry
  • Medicine


Abstract In rats with abnormally low withdrawal thresholds (`allodynia') in one hindpaw induced by a photochemical sciatic lesion, an intrathecal catheter was inserted to the lumber enlargement and an epidural electrode was implanted at T11. I.t. administration of GABA B or adenosine A 1 receptor agonists (baclofen, R(−)- N 6-(2-phenylisopropyl)adenosine (R-PIA)) suppressed allodynia in a dose-dependent fashion. When the two agonists were given together, each in an ineffective dose, there was a normalization of the thresholds. Rats, in which spinal cord stimulation (SCS) could not suppress the allodynia (non-responders), were transformed into SCS-responders by injection of baclofen and R-PIA in low, ineffective doses, combined with SCS. In SCS responding rats, combination of a selective GABA B and an adenosine A 1 receptor antagonist (CGP 55845, CPT) in low, ineffective doses abolished the SCS-induced threshold normalization. These results indicate that GABAergic and adenosine-dependent mechanisms are involved in the SCS effect and further suggest a strategy for enhancing the therapeutic efficacy of SCS.

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