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  • Title: Spinal antinociceptive effects of adenosine compounds in mice.
    Author: Doi T, Kuzuna S, Maki Y.
    Journal: Eur J Pharmacol; 1987 Jun 04; 137(2-3):227-31. PubMed ID: 2440705.
    Abstract:
    The effects of injecting ATP, ADP, AMP, adenosine and adenine intrathecally on the pain response induced by the injection of substance P (10 ng/mouse) intrathecally were studied. All the compounds except adenine inhibited the pain response in a dose-related manner. The ED50 values of ATP, ADP, AMP and adenosine were 2.10, 0.93, 0.88 and 0.48 micrograms/mouse, respectively. Pretreatment with theophylline at a dose of 100 mg/kg p.o. markedly diminished all the antinociceptive effects. The effect of adenosine was not affected by s.c. injection of naloxone. These results suggest the existence of adenosine receptors which modulate spinal nociceptive sensory processing, independently of the endogenous opiate system.
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