title: Denopamine, a beta(1)-adrenergic agonist, increases alveolar fluid clearance in ex vivo rat and guinea pig lungs.
abstract: The effect of denopamine, a selective beta(1)-adrenergic agonist, on alveolar fluid clearance was determined in both ex vivo rat and guinea pig lungs. Alveolar fluid clearance was measured by the progressive increase in the concentration of Evans blue-labeled albumin over 1 h at 37 degrees C. Denopamine (10(-6) to 10(-3) M) increased alveolar fluid clearance in a dose-dependent manner in ex vivo rat lungs. Denopamine also stimulated alveolar fluid clearance in guinea pig lungs. Atenolol, a selective beta(1)-adrenergic antagonist, and amiloride, a sodium channel inhibitor, inhibited denopamine-stimulated alveolar fluid clearance. The potency of denopamine was similar to that of similar doses of isoproterenol or terbutaline. Short-term hypoxia (100% nitrogen for 1-2 h) did not alter the stimulatory effect of denopamine. Denopamine (10(-4), 10(-3) M) increased intracellular adenosine 3',5'-cyclic monophosphate levels in cultured rat alveolar type II cells. In summary, denopamine, a selective beta(1)-adrenergic agonist, stimulates alveolar fluid clearance in both ex vivo rat and guinea pig lungs.
authors.affiliation: Department of Pulmonary Medicine, Kanazawa Medical University, Uchinade, Ishikawa 920-0293, Japan. sakuma-t@kanazawa-med.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Sakuma
authors.forename: C
authors.initials: C
authors.lastname: Tuchihara
authors.forename: M
authors.initials: M
authors.lastname: Ishigaki
authors.forename: K
authors.initials: K
authors.lastname: Osanai
authors.forename: Y
authors.initials: Y
authors.lastname: Nambu
authors.forename: H
authors.initials: H
authors.lastname: Toga
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
authors.forename: N
authors.initials: N
authors.lastname: Ohya
authors.forename: T
authors.initials: T
authors.lastname: Kurihara
authors.forename: M A
authors.initials: MA
authors.lastname: Matthay
mesh_terms: D000208:Acute Disease; D000318:Adrenergic beta-Agonists / Q000494:pharmacology*; D000319:Adrenergic beta-Antagonists / Q000494:pharmacology; D000818:Animals; D001826:Body Fluids / Q000378:metabolism*; D002478:Cells, Cultured; D000242:Cyclic AMP / Q000378:metabolism; D004983:Ethanolamines / Q000494:pharmacology*; D006168:Guinea Pigs; D000860:Hypoxia / Q000378:metabolism; D066298:In Vitro Techniques; D007545:Isoproterenol / Q000494:pharmacology; D008171:Lung Diseases / Q000378:metabolism; D008297:Male; D011650:Pulmonary Alveoli / Q000166:cytology / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D026941:Sodium Channel Blockers; D013726:Terbutaline / Q000494:pharmacology
chemical_list: D000318:Adrenergic beta-Agonists; D000319:Adrenergic beta-Antagonists; D004983:Ethanolamines; D026941:Sodium Channel Blockers; D000242:Cyclic AMP; D007545:Isoproterenol; D013726:Terbutaline; C037293:denopamine