title: Conversion of angiotensin I in isolated perfused guinea-pig and rat lung.
abstract: Increasing concentrations of angiotensin I and different perfusion rates were used to study the conversion of angiotensin I in guinea-pig and rat lungs. Even the highest concentration used (32.0 muM), which is a thousand times higher than that which occurs in vivo, was unable to saturate the converting system indicating the enormous capacity of this system. SQ 20881 proved to be a reversible inhibitor of the converting system. Its effect on the angiotensin I conversion was greater in guinea-pig lungs than in rat lungs (ID50 was 40.0 nM in guinea-pig lung and above 360.0 nM in rat lungs at a substrate concentration of 38.6 nM).
mesh_terms: D000804:Angiotensin II / Q000096:biosynthesis / Q000276:immunology / Q000378:metabolism*; D000806:Angiotensin-Converting Enzyme Inhibitors; D000818:Animals; D000918:Antibody Specificity; D001667:Binding, Competitive; D005260:Female; D006168:Guinea Pigs; D066298:In Vitro Techniques; D007700:Kinetics; D008168:Lung / Q000378:metabolism*; D008297:Male; D010477:Perfusion; D011863:Radioimmunoassay; D051381:Rats; D013722:Teprotide / Q000494:pharmacology
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D000804:Angiotensin II; D013722:Teprotide