Antinociceptive effects of neonatal capsaicin in rats with adjuvant arthritis |
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Authors: | Akiyoshi Hara Tsukasa Sakurada Shinobu Sakurada Hisao Matsumura Kensuke Kisara |
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Affiliation: | (1) Department of Pharmacology, Tohoku College of Pharmacy, 4-4-1 Komatsushima, 983 Sendai, Japan |
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Abstract: | Summary Rats were treated with capsaicin (50 mg/kg, SC) either on the second day or on the second and third days of life. A significant attenuation of the responses to noxious stimuli was obtained in the capsaicin treated animals as measured by the hot-plate or paw pressure tests but not by the tail-flick test. Furthermore, neonatal capsaicin produced a significant reduction of response in the formalin test. Capsaicin reduced the reaction latency in rats with adjuvant arthritis as measured by the hot-plate and paw pressure tests, though capsaicin did not alter the overall time course of the response to Freund's adjuvant. Capsaicin also attenuated the weight loss or the decreased ambulatory and rearing behaviour which occurred in the control animals with adjuvant arthritis. It is suggested that neonatal treatment with capsaicin may relieve the responsiveness to longlasting nociceptive stimuli by adjuvant in rats. |
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Keywords: | Neonatal capsaicin Antinociceptive effects Adjuvant arthritis Substance P Rat |
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