title: Effect of ibudilast on ciliary activity of human paranasal sinus mucosa in vitro.
abstract: The effect of ibudilast (CAS 50847-11-5, 3-isobutyryl-2-isopropylpyrazolo[1,5-a]pyridine, KC-404), an anti-asthmatic drug, on ciliary beat frequency (CBF) of human paranasal sinus mucosa was examined in vitro. Ciliary activation was observed after a 10-min exposure to 4.6 x 10(-6) mol/l ibudilast. Ibudilast dose-dependently increase CBF at the concentrations ranging from 4.6 x 10(-7) mol/l to 4.6 x 10(-5) mol/l. Propranolol inhibited ciliary activity induced by ibudilast; however, neither indometacin nor verapamil affected the activation of ibudilast on CBF. Platelet activating factor (PAF) and Leukotriene D4 (LTD4) are chemical mediators inducing mucosal dysfunction and damage. Ibudilast prevented ciliary inhibition induced by PAF and LTD4. These findings indicated that ibudilast activates CBF and inhibits the effect of PAF and LTD4 on ciliated cells, and consequently improves the pathogenesis of allergic disorders such as the inhibited mucociliary transport system and airway hyperresponsiveness.
authors.affiliation: Department of Otorhinolaryngology, Yamanashi Medical University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ganbo
authors.forename: K
authors.initials: K
authors.lastname: Hisamatsu
authors.forename: A
authors.initials: A
authors.lastname: Mizukoshi
authors.forename: H
authors.initials: H
authors.lastname: Inoue
authors.forename: K
authors.initials: K
authors.lastname: Kikushima
authors.forename: J
authors.initials: J
authors.lastname: Kou
authors.forename: Y
authors.initials: Y
authors.lastname: Kozuka
authors.forename: Y
authors.initials: Y
authors.lastname: Murakami
mesh_terms: D001993:Bronchodilator Agents / Q000494:pharmacology*; D002923:Cilia / Q000187:drug effects; D006801:Humans; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D017998:Leukotriene D4 / Q000494:pharmacology; D009079:Mucociliary Clearance / Q000187:drug effects; D009297:Nasal Mucosa / Q000166:cytology / Q000187:drug effects*; D010256:Paranasal Sinuses / Q000166:cytology / Q000187:drug effects*; D010972:Platelet Activating Factor / Q000494:pharmacology; D011433:Propranolol / Q000494:pharmacology; D011725:Pyridines / Q000494:pharmacology*; D014700:Verapamil / Q000494:pharmacology; D007212:Indolizines; D011720:Pyrazoles
chemical_list: D001993:Bronchodilator Agents; D007213:Indomethacin; D017998:Leukotriene D4; D010972:Platelet Activating Factor; D011433:Propranolol; D011725:Pyridines; D014700:Verapamil; C038366:ibudilast; D007212:Indolizines; D011720:Pyrazoles