The role of cyclooxygenase-1 and -2 in the rat formalin test

Anesthesia and Analgesia
Tatsuo Yamamoto, Natsuko Nozaki-Taguchi

Abstract

Prostaglandins are thought to play an important role in nociceptive transmission at peripheral sites and in the spinal cord. Prostaglandins are produced by cyclooxygenase (COX), which catalyzes the conversion of arachidonic acid. Two forms of COX have been identified: COX-1, which is constitutively expressed, and COX-2, which is an inducible enzyme. To define the role of COX-1 in nociceptive transmission, we examined the effect of oral and intrathecal administration of 5-(4-chlorophenyl)-1-(4-methoxyphenyl)-3-trifluoromethylpyrazole (SC-560), a selective COX-1 inhibitor, on the rat formalin test and compared the effect of SC-560 with that of celecoxib, a COX-2 selective inhibitor, and indomethacin, a nonselective COX-1 and COX-2 inhibitor, on the rat formalin test. Oral and intrathecal administration of SC-560 had no effect on the agitation behavior in the rat formalin test. Oral and intrathecal administration of celecoxib and indomethacin depressed agitation behavior during the rat formalin test. These data suggest that prostaglandins synthesized by COX-1 are not involved in nociceptive transmission during the rat formalin test but that COX-2 does play an important role in the rat formalin test. Our data suggest that a COX-2 s...Continue Reading

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Citations

Aug 21, 2007·European Journal of Pain : EJP·Shailesh P DudhgaonkarV Ravi Prakash
May 3, 2015·Pharmacological Reports : PR·Isela E Juárez-RojopVinicio Granados-Soto
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Mar 28, 2017·The Journal of Venomous Animals and Toxins Including Tropical Diseases·Renata Gonçalves DiasGisele Picolo
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Jun 6, 2006·Pharmacology & Therapeutics·Sandra J HewettJames A Hewett
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Apr 19, 2018·Biomedicine & Pharmacotherapy = Biomédecine & Pharmacothérapie·Nathália M Dos SantosClaudio Viegas

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