title: Ca2+ stimulates COX-2 expression through calcium-sensing receptor in fibroblasts.
abstract: Fibroblasts isolated from jaw cysts expressed calcium-sensing receptor (CasR). In the fibroblasts elevated extracellular Ca(2+) ([Ca(2+)](o)) increased fluo-3 fluorescence intensity, and the production of inositol(1,4,5)trisphosphate and active protein kinase C. Phospholipase C inhibitor U-73122 attenuated the Ca(2+)-induced increase in fluo-3 fluorescence intensity. Elevated [Ca(2+)](o) enhanced the expression of cyclooxygenase-2 (COX-2) mRNA and protein, and the secretion of prostaglandin E(2) in the fibroblasts. CasR activator neomycin also increased the expression of COX-2 mRNA, and U-73122 attenuated the Ca(2+)-induced expression of COX-2 mRNA. Elevated [Ca(2+)](o)-induced phosphorylation of extracellular signal-regulated protein kinase-1/2 (ERK1/2), p38 mitogen-activated protein kinase (MAPK), and c-Jun N-terminal kinase (JNK), and U-73122 inhibited the Ca(2+)-induced phosphorylation. The inhibitors for each kinase, PD98059, SB203580, and SP600125, attenuated the Ca(2+)-induced expression of COX-2 mRNA. These results suggest that in jaw cyst fibroblasts elevated extracellular Ca(2+) may enhance COX-2 expression via the activation of ERK1/2, p38 MAPK, and JNK through CasR.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Graduate School of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
authors.forename: Sachie
authors.initials: S
authors.lastname: Ogata
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Kubota
authors.forename: Shinji
authors.initials: S
authors.lastname: Satoh
authors.forename: Shinich
authors.initials: S
authors.lastname: Ito
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takeuchi
authors.forename: Megumi
authors.initials: M
authors.lastname: Ashizuka
authors.forename: Kanemitsu
authors.initials: K
authors.lastname: Shirasuna
mesh_terms: D000873:Anthracenes / Q000494:pharmacology; D001842:Bone and Bones / Q000166:cytology* / Q000187:drug effects / Q000201:enzymology; D002118:Calcium / Q000378:metabolism*; D020013:Calcium Signaling; D002413:Cations, Divalent / Q000378:metabolism; D051546:Cyclooxygenase 2 / Q000235:genetics / Q000378:metabolism*; D015232:Dinoprostone / Q000378:metabolism; D004963:Estrenes / Q000494:pharmacology; D005347:Fibroblasts / Q000187:drug effects / Q000201:enzymology*; D005419:Flavonoids / Q000494:pharmacology; D006801:Humans; D007093:Imidazoles / Q000494:pharmacology; D020928:Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D010766:Phosphorylation; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D011725:Pyridines / Q000494:pharmacology; D011760:Pyrrolidinones / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D044169:Receptors, Calcium-Sensing / Q000235:genetics / Q000378:metabolism*; D010738:Type C Phospholipases / Q000037:antagonists & inhibitors / Q000378:metabolism
chemical_list: D000873:Anthracenes; D002413:Cations, Divalent; D004963:Estrenes; D005419:Flavonoids; D007093:Imidazoles; D047428:Protein Kinase Inhibitors; D011725:Pyridines; D011760:Pyrrolidinones; D012333:RNA, Messenger; D044169:Receptors, Calcium-Sensing; C060229:1-(6-((3-methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl)-1H-pyrrole-2,5-dione; C432165:pyrazolanthrone; D051546:Cyclooxygenase 2; D020928:Mitogen-Activated Protein Kinases; D010738:Type C Phospholipases; D015232:Dinoprostone; C093642:SB 203580; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one; D002118:Calcium