Effects of angiotensin II and angiotensin III on airway epithelial short-circuit current: involvement of pertussis toxin-sensitive G protein.
The effects of angiotensin II (AII) and angiotensin III (AIII) on bioelectric properties of canine cultured tracheal epithelium were investigated. Both peptides increased the short-circuit current (Isc), an effect that was accompanied by the release of prostaglandin (PG) E2 and was abolished by indomethacin and diphenylamine-2-carboxylate but not by amiloride. The AII action was not altered by amastatin. The increases in Isc induced by AII and AIII were inhibited by pertussis toxin, whereas cholera toxin had no effect. Thus, both peptides may selectively stimulate airway epithelial Cl- secretion through the activation of pertussis toxin-sensitive regulatory G protein and the subsequent generation of PGE2.
Tamaoki
J
J
First Department of Medicine, Tokyo Women's Medical College, Japan.
Chiyotani
A
A
Takeyama
K
K
Konno
K
K
D000804:Angiotensin II / Q000494:pharmacology*; D000805:Angiotensin III / Q000494:pharmacology*; D000818:Animals; D002478:Cells, Cultured; D002772:Cholera Toxin / Q000494:pharmacology; D004285:Dogs; D004594:Electrophysiology; D004848:Epithelium / Q000187:drug effects; D019204:GTP-Binding Proteins / Q000502:physiology*; D037342:Pertussis Toxin; D014132:Trachea / Q000166:cytology / Q000187:drug effects*; D010566:Virulence Factors, Bordetella / Q000494:pharmacology
D010566:Virulence Factors, Bordetella; D000804:Angiotensin II; D000805:Angiotensin III; D002772:Cholera Toxin; D037342:Pertussis Toxin; D019204:GTP-Binding Proteins