title: alpha7 Nicotinic acetylcholine receptor stimulation inhibits lipopolysaccharide-induced interleukin-18 and -12 production in monocytes.
abstract: Nicotine inhibited interleukin (IL)-18 and -12 production in lipopolysaccharide (LPS)-stimulated monocytes, and the action of nicotine was antagonized by a non-selective and a selective alpha7 nicotinic acetylcholine receptor (alpha7-nAChR) antagonist, suggesting that the stimulation of alpha7-nAChR may be involved in the action of nicotine. Nicotine is reported to induce prostaglandin E(2) (PGE(2)) production in monocytes through the up-regulation of cyclooxygenase (COX)-2 expression. PGE(2) is known to increase cAMP levels and to activate protein kinase A (PKA). COX-2 and PKA inhibitors prevented the action of nicotine, indicating that the mechanism of action of nicotine may be via endogenous PGE(2) production.
authors.affiliation: Department of Pharmacology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science, Japan.
authors.forename: Hideo Kohka
authors.initials: HK
authors.lastname: Takahashi
authors.forename: Hiromi
authors.initials: H
authors.lastname: Iwagaki
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Hamano
authors.forename: Tadashi
authors.initials: T
authors.lastname: Yoshino
authors.forename: Noriaki
authors.initials: N
authors.lastname: Tanaka
authors.forename: Masahiro
authors.initials: M
authors.lastname: Nishibori
mesh_terms: D002038:Bungarotoxins / Q000494:pharmacology; D006801:Humans; D018664:Interleukin-12 / Q000096:biosynthesis*; D020382:Interleukin-18 / Q000096:biosynthesis*; D018950:Lipopolysaccharide Receptors / Q000378:metabolism; D008070:Lipopolysaccharides / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D008464:Mecamylamine / Q000494:pharmacology; D009000:Monocytes / Q000187:drug effects / Q000378:metabolism*; D009538:Nicotine / Q000494:pharmacology; D018722:Nicotinic Agonists / Q000494:pharmacology*; D018733:Nicotinic Antagonists / Q000494:pharmacology; D011978:Receptors, Nicotinic / Q000187:drug effects*; D064569:alpha7 Nicotinic Acetylcholine Receptor
chemical_list: D002038:Bungarotoxins; C579167:Chrna7 protein, human; D020382:Interleukin-18; D018950:Lipopolysaccharide Receptors; D008070:Lipopolysaccharides; D018722:Nicotinic Agonists; D018733:Nicotinic Antagonists; D011978:Receptors, Nicotinic; D064569:alpha7 Nicotinic Acetylcholine Receptor; D018664:Interleukin-12; D008464:Mecamylamine; D009538:Nicotine