title: Generation of prostaglandin E-like material by the guinea-pig trachea contracted by histamine.
abstract: Challenges of the superfused (1 ml min-1) trachea with histamine (100-200 mug) result in the release of prostaglandin E-like material (3-25 ng in terms of prostaglandin E2) but no prostaglandin F-like activity has been detected in the superfusate. This release is blocked by indomethacin (1mug ml-1) and then the contractile action of histamine is enhanced. It is concluded that the release of a prostaglandin E-like material by histamine from tracheal smooth muscles is a self-defensive mechanism protecting against the strong constriction of airways. The maximal relaxation of trachea by isoprenaline (50-500 mug) is not accompanied by the release of a prostaglandin-like material.
mesh_terms: D000818:Animals; D003106:Colon / Q000187:drug effects; D006632:Histamine / Q000494:pharmacology*; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D007545:Isoproterenol / Q000494:pharmacology; D051379:Mice; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects; D011453:Prostaglandins / Q000096:biosynthesis*; D051381:Rats; D013270:Stomach / Q000187:drug effects; D014132:Trachea / Q000187:drug effects / Q000378:metabolism*
chemical_list: D011453:Prostaglandins; D006632:Histamine; D007545:Isoproterenol; D007213:Indomethacin