Nociceptive and inflammatory responses induced by formalin in the orofacial region of rats: Effect of anti-TNFα strategies

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• 作者：Paula Juliana Seadi Pereira ; Fabiana Noronha Dornelles ; Dió ; genes Santiago Santos ; Joã ; o Batista Calixto ; Fern ; a Bueno Morrone ; Maria Martha Campos
• 关键词：Orofacial region ; Formalin ; Nociception ; Plasma extravasation ; TNFα ; Rat
• 刊名：International Immunopharmacology
• 出版年：2009
• 出版时间：January 2009
• 年：2009
• 卷：9
• 期：1
• 页码：80-85
• 全文大小：527 K

文摘

This study evaluated the effects of different anti-TNFα strategies on the nociceptive and inflammatory responses triggered by formalin in the rat orofacial region. Formalin injection (2.5 % ) into the right upper lip caused a nociceptive response that was biphasic, with the first phase observed between 0 and 3 min and the second phase between 12 and 30 min. Plasma extravasation induced by formalin was time-related and reached the peak at 360 min. The monoclonal antibody anti-TNFα (25 and 50 pg/lip) significantly inhibited the second phase of formalin-induced nociceptive behavior, while the first phase remained unaltered. The systemic treatment with the chimeric anti-TNFα antibody infliximab also caused a significant inhibition of the second phase. Interestingly, the local administration of infliximab (50 pg/lip) produced a significant reduction of both phases of formalin-induced nociception. In addition, the systemic pretreatment with the preferential inhibitor of TNFα synthesis thalidomide (25 and 50 mg/kg, p.o) promoted a marked reduction of the first and second phases of formalin-evoked nociception. The local administration of the monoclonal antibody anti-TNFα (25 and 50 pg/lip) or infliximab (50 pg/lip) markedly reduced the plasma extravasation induced by formalin. Otherwise, formalin-elicited plasma extravasation was not significantly affected by the systemic administration of either infliximab (1 mg/kg; s.c) or thalidomide (50 mg/kg, p.o). Present data suggest that blocking TNFα effects, through different pharmacological tools, could represent a good alternative to control orofacial inflammatory pain that is refractory to other drugs.