title: Prostaglandin E2 suppresses beta1-integrin expression via E-prostanoid receptor in human monocytes/macrophages.
abstract: Beta1-integrins mediate cell attachment to different extracellular matrix proteins, intracellular proteins, and intercellular adhesions. Recently, it has been reported that prostaglandin E2 (PGE2) has anti-inflammatory properties such as inhibition of the expression of adhesion molecules or production of chemokines. However, the effect of PGE2 on the expression of beta1-integrin remains unknown. In this study, we investigated the effects of PGE2 on the expression of beta1-integrin in the human monocytic cell line THP-1 and in CD14+ monocytes/macrophages in human peripheral blood. For this, we examined the role of four subtypes of PGE2 receptors and E-prostanoid (EP) receptors on PGE2-mediated inhibition. We found that PGE2 significantly inhibited the expression of beta1-integrin, mainly through EP4 receptors in THP-1 cells and CD14+ monocytes/macrophages in human peripheral blood. We suggest that PGE2 has anti-inflammatory effects, leading to the inhibited expression of beta1-integrin in human monocytes/macrophages, and that the EP4 receptor may play an important role in PGE2-mediated inhibition.
authors.affiliation: Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Japan. shunji@yamaguchi-u.ac.jp
authors.forename: Shunji
authors.initials: S
authors.lastname: Hasegawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Ichiyama
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Kohno
authors.forename: Yuno
authors.initials: Y
authors.lastname: Korenaga
authors.forename: Ayami
authors.initials: A
authors.lastname: Ohsaki
authors.forename: Reiji
authors.initials: R
authors.lastname: Hirano
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Haneda
authors.forename: Reiji
authors.initials: R
authors.lastname: Fukano
authors.forename: Susumu
authors.initials: S
authors.lastname: Furukawa
mesh_terms: D015153:Blotting, Western; D045744:Cell Line, Tumor; D015232:Dinoprostone / Q000494:pharmacology*; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D019012:Integrin beta1 / Q000378:metabolism*; D008264:Macrophages / Q000187:drug effects / Q000276:immunology*; D009000:Monocytes / Q000187:drug effects / Q000276:immunology*; D012333:RNA, Messenger / Q000378:metabolism; D018078:Receptors, Prostaglandin E / Q000037:antagonists & inhibitors / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D019012:Integrin beta1; D012333:RNA, Messenger; D018078:Receptors, Prostaglandin E; D015232:Dinoprostone