title: Human and rat atrial natriuretic polypeptides and their precursors.
abstract: A highly sensitive radio-immunoassay (RIA) to detect all the atrial natriuretic polypeptides (ANPs) isolated so far from human and rat (hANPs and rANPs) has been established by using an antiserum raised against alpha-hANP. The antiserum recognizes the sub-sequence flanked by two cysteine residues (positions 7 and 23) in alpha-hANP and cross-reacts with hANPs as well as rANPs. By using the RIA combined with gel chromatography or high-performance liquid chromatography, it was revealed that ANP immunoreactivity in human atria is composed of alpha- (28 residues), beta- (56 residues: alpha-hANP dimer) and gamma-hANP (126 residues) in various ratios. In rat, porcine and bovine atrial tissues, however, gamma-rANP (126 residues) was found to be a major component. In contrast with atrial ANP, plasma ANP was found to be predominantly alpha-form in rat.
mesh_terms: D000818:Animals; D009320:Atrial Natriuretic Factor / Q000032:analysis*; D055598:Chemical Phenomena; D002621:Chemistry; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D007106:Immune Sera; D011498:Protein Precursors / Q000032:analysis; D011863:Radioimmunoassay; D051381:Rats; D014018:Tissue Distribution
chemical_list: D007106:Immune Sera; D011498:Protein Precursors; D009320:Atrial Natriuretic Factor