title: Involvement of arachidonic acid cascade in working memory impairment induced by interleukin-1 beta.
abstract: The aim of the present study is to clarify the possible relevance of the arachidonic acid cascade to working memory in rats, by using a three-panel runway apparatus. Interleukin-1 beta, injected bilaterally into the dorsal hippocampus at a dose of 100 ng/side, significantly impaired working memory, and this impairment was attenuated by pretreatment with 10 mg/kg (s.c.) of diclofenac, a cyclooxygenase inhibitor. Working memory was also impaired in rats administered a bilateral intrahippocampal injection of prostaglandin E2, in a dose-dependent manner at 0.01-1 microg/side. Furthermore, an injection of 100 ng/side of interleukin-1 beta significantly increased production of prostaglandin E2 (580 +/- 32 pg to 1142 +/- 101 pg/100 mg wet tissue) in the hippocampus. Taken together, these findings suggest that the activation of the arachidonic acid cascade was causative of the working memory impairment induced by interleukin-1 beta.
authors.affiliation: Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: Taku
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: Shigenori
authors.initials: S
authors.lastname: Watanabe
authors.forename: Tsuneyuki
authors.initials: T
authors.lastname: Yamamoto
mesh_terms: D000818:Animals; D016718:Arachidonic Acid / Q000502:physiology*; D004008:Diclofenac / Q000494:pharmacology; D006624:Hippocampus / Q000187:drug effects / Q000502:physiology; D007375:Interleukin-1 / Q000633:toxicity*; D008297:Male; D008569:Memory Disorders / Q000139:chemically induced / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D015398:Signal Transduction / Q000187:drug effects* / Q000502:physiology
chemical_list: D007375:Interleukin-1; D004008:Diclofenac; D016718:Arachidonic Acid