Heterologous Radioimmunoassay of Atrial Natriuretic Polypeptide in Dog and Rabbit Plasma

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Abstract
Atrial natriuretic peptide (ANP) was measured in plasma of dogs and rabbits by radioimmunoassay (RIA) using a commercially available anti α-ANP serum and compared to our measurements of ANP in rats and humans. Plasma concentration of ANP in dog coronary sinus (234.9 ± 41.0 pg/ml) was significantly greater than in systemic arterial blood (81.2 ± 8.4 pg/ml). Gel filtration of dog coronary sinus plasma resulted in an ANP peak with the elution volume (Ve) of synthetic atriopeptin III (AIII) and a minor peak eluting with the void volume (Vo). Rabbit systemic arterial plasma ANP was 53.3 ± 4.3 pg/ml and yielded one peak, with a Ve of AIII. Ion exchange chromatography of dog and rabbit atrial extracts (AE) resulted in a major ANP region which resembled AIII. Gel filtration of AE showed larger molecular species as well as AIII. Dilutions of dog and rabbit plasma and AE were parallel with the AIII standard in radioimmunoassay.