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  • Title: The presence of brain natriuretic peptide of 12,000 daltons in porcine heart.
    Author: Minamino N, Aburaya M, Ueda S, Kangawa K, Matsuo H.
    Journal: Biochem Biophys Res Commun; 1988 Sep 15; 155(2):740-6. PubMed ID: 3421966.
    Abstract:
    Brain natriuretic peptide (BNP) and its N-terminally six amino acid extended form (BNP-32) have been identified in porcine brain. These peptides exert diuretic-natriuretic and hypotensive effects, and have remarkably high sequence homology to atrial natriuretic peptide (ANP). We have set up a radioimmunoassay system specific to BNP and surveyed immunoreactive (ir-) BNP in peripheral tissue. In porcine cardiac atrium, we found the highest concentration of ir-BNP. By using gel filtration and reverse phase high performance liquid chromatography, ir-BNP was characterized. Most of ir-BNP in the atrium was found to exist as a high molecular weight form of 12,000 daltons; less than 15% of the total ir-BNP exist as low molecular weight forms such as BNP and BNP-32. These results suggest that BNP functions as a circulating hormone in addition to the neuropeptide function in brain.
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