Abstract
The writhing response to acute nociception has been used to test the analgesic activity of drugs in rodents. Dilute acetic acid is the most frequently used irritant to induce writhing behaviour. The administration of acetic acid intraperitoneally activates both peripheral and central mechanisms of nociception. It releases nociceptive mediators such as prostaglandins (PG) E2and I2at the site of noxious stimulation, the peritoneal cavity, and at central sites such as the dorsal horn of the spinal cord and some brain regions. We have used the PGI2mimetic, iloprost, an agonist at the IP receptor, to induce the writhing response in mice. Iloprost activates the IP receptors on peripheral nociceptors directly and thus does not release nociceptive prostaglandins into the peritoneal cavity. However, prostaglandins are still involved in nociceptive transmission at the spinal and supraspinal levels. Using this model of nociception, it is possible to identify the site of action of analgesic drugs which reduce prostaglandin release in central tissues through inhibition of cyclooxygenase. Thus, a drug that inhibits the iloprost-induced writhing response and reduces release of prostaglandins in the central nervous system is likely to be a centrally acting analgesic drug. This chapter compares the iloprost- and acetic acid-induced writhing responses in mice and describes a method for measuring central prostaglandin levels. Part of this work has been published previously (1).
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Ayoub, S.S., Botting, R.M. (2010). Iloprost-Induced Nociception: Determination of the Site of Anti-nociceptive Action of Cyclooxygenase Inhibitors and the Involvement of Cyclooxygenase Products in Central Mechanisms of Nociception. In: Ayoub, S., Flower, R., Seed, M. (eds) Cyclooxygenases. Methods in Molecular Biology, vol 644. Humana Press. https://doi.org/10.1007/978-1-59745-364-6_18
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DOI: https://doi.org/10.1007/978-1-59745-364-6_18
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