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KMID : 0811720070110050221
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Korean Journal of Physiology & Pharmacology
2007 Volume.11 No. 5 p.221 ~ p.226
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Multiple 5-Hydroxytryptamine (5-HT) Receptors Are Involved in the Melittin-induced Nociceptive Responses in Rat I. Role of Peripheral 5-HT Receptor
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Shin Hong-Kee
Lee Seo-Eun
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Abstract
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Melittin-induced tonic pain model is characterized by local inflammation, edema, spontaneous flinchings, and sustained mechanical hypersensitivity. These nociceptive responses are mediated through selective activation of capsaicin-sensitive primary afferent fibers by melittin. The present study was undertaken to elucidate the role of peripheral 5-hydroxytryptamine (5-HT) receptors in the melittin-induced nociceptive responses. Changes in mechanical threshold, flinching behaviors and paw thickness were measured in rat intraplantarly injected with melittin (40μg/paw) alone or treated together with melittin and 5-HT receptor antagonists. WAY-100635 (100μg & 200μg/paw), isamoltane hemifumarate (100μg & 200μg/paw), methysergide maleate (60μg, 120μg & 200μg/paw) and ICS-205,930 (100μg & 200μg/paw) were intraplantarly injected 20 min before melittin injection. All 5-HT receptor antagonists tested in this experiment significantly attenuated the ability of melittin to reduce mechanical threshold and to induce flinching behaviors. 5-HT receptor antagonists, except ICS-205,930, had mild inhibitory effect on melittin-induced edema. These experimental findings suggest that multiple peripheral 5-HT receptors are involved in the melittin-induced nociceptive responses.
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KEYWORD
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Melittin, Nociceptive responses, Peripheral 5-HT receptors
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