title: Nicotinic enhancement of proliferation in bovine and porcine cerebral microvascular endothelial cells.
abstract: Nicotinic acetylcholine receptors are found in microvascular endothelial cells. To reveal the functional role in cerebral angiogenic processes, we studied the nicotinic modulation of proliferation activity in cultured bovine and porcine cerebral microvascular endothelial cells. The proliferation activity was determined by an increase in the number of cells present in culture dishes. When the bovine cerebral endothelial cells at different passages were cultured in the presence of nicotine (10 nM), the proliferation activities were significantly increased in the cells at passage 1 and passage 3, but not at passage 4. Reverse transcriptase-polymerase chain reaction studies demonstrated that the expression of mRNAs coding for alpha3 nicotinic receptor subunit was significantly reduced in the bovine cerebral endothelial cells at passage 4, compared with that at passage 1. The proliferation of porcine cerebral endothelial cells (passage 1) was enhanced by acetylcholine (10 nM-100 microM) in the presence of atropine, a muscarinic antagonist, and this enhancing effect was inhibited by hexamethonium (100 microM, a nicotinic antagonist). The stimulation by acetylcholine (1 microM, with atropine) or nicotine (10 nM) induced the phosphorylation of a mitogen-activated protein (MAP) kinase (extracellular-signal regulated kinase: ERK) in the serum-starved endothelial cells. In the presence of PD98059 (2 microM, a MAP kinase kinase inhibitor) and atropine, acetylcholine (1 microM) failed to enhance the proliferation of porcine cerebral endothelial cells. These results demonstrate that nicotinic stimulation promotes the proliferation of bovine and porcine cerebral microvascular endothelial cells, at least in part, through the MAP kinase activation.
authors.affiliation: Department of Clinical Pharmacology, Toyama Medical and Pharmaceutical University, Toyama, Japan. htsuneki@ms.toyama-mpu.ac.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tsuneki
authors.forename: Kana
authors.initials: K
authors.lastname: Ito
authors.forename: Naoto
authors.initials: N
authors.lastname: Sekizaki
authors.forename: En-Long
authors.initials: EL
authors.lastname: Ma
authors.forename: Yueren
authors.initials: Y
authors.lastname: You
authors.forename: Junichi
authors.initials: J
authors.lastname: Kawakami
authors.forename: Isao
authors.initials: I
authors.lastname: Adachi
authors.forename: Toshiyasu
authors.initials: T
authors.lastname: Sasaoka
authors.forename: Ikuko
authors.initials: I
authors.lastname: Kimura
mesh_terms: D000818:Animals; D002417:Cattle; D049109:Cell Proliferation / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D008833:Microcirculation / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D009538:Nicotine / Q000494:pharmacology*; D011978:Receptors, Nicotinic / Q000378:metabolism; D013552:Swine
chemical_list: D011978:Receptors, Nicotinic; D009538:Nicotine; D019950:Mitogen-Activated Protein Kinase 1