A novel analgesic compound OT-7100 attenuates nociceptive responses in animal models of inflammatory and neuropathic hyperalgesia: a possible involvement of adenosinergic anti-nociception.
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| Abstract |
We studied the effects of OT-7100 (5-n-butyl-7-(3,4,5-trimethoxybenzoylamino)pyrazolo [1,5-a]pyrimidine), a novel analgesic compound, on the inhibitory action of adenosine on the contraction of guinea pig ileum and investigated the effects of OT-7100 on the nociceptive responses in animal models of inflammatory and peripheral neuropathic hyperalgesia and decreases spinal c-Fos expression. OT-7100 at 0.3 - 3 microM significantly enhanced the inhibitory effect of adenosine on the contraction of guinea pig ileum. The efficacy of OT-7100 (1, 3 or 10 mg/kg, p.o.) on hyperalgesia induced by yeast or substance P and in the Bennett model was significantly suppressed by coadministration of the adenosine A1 antagonist DPCPX (0.01 or 0.1 pmol/animal, i.t.), while OT-7100 without DPCPX significantly increased the nociceptive threshold in each rat model. OT-7100 (3, 10 and 30 mg/kg per day, p.o.) significantly inhibited the mechanical nociceptive threshold in the injured paw in the Chung model. OT-7100 (30 mg/kg, p.o.) significantly decreased the number of Fos-LI neurons in the spinal dorsal horn in the Bennett model. These finding suggest that OT-7100 inhibits hyperalgesia in these animal models possibly by enhancing adenosinergic neurotransmission in the dorsal horn, although we still lack direct evidence for it.
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| Authors | T Yasuda, K Okamoto, T Iwamoto, S Miki, N Yoshinaga, S Sato, K Noguchi, E Senba |
| Journal | Japanese journal of pharmacology (Jpn J Pharmacol) Vol. 87 Issue 3 Pg. 214-25 (Nov 2001) ISSN: 0021-5198 [Print] Japan |
| PMID | 11885971 (Publication Type: Journal Article) |
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