Distribution of immunoreactive atrial and brain natriuretic peptides in the heart of the newt, Cynops pyrrhogaster.
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The distribution of immunoreactive (ir-) atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) was studied immunohistochemically and immunoelectronmicroscopically in the heart of the newt, <I>Cynops pyrrhogaster</I>. The difference in immunostaining for ANP and BNP indicated that the heart of the newt contains two peptides, and that they are immunologically related to mammalian ANP and BNP, respectively. Immunoreactivity for ANP was stronger than that for BNP in the atrium, postcaval vein and sinus venosus of all specimens, while immunoreactivity for BNP was similar to or stronger than that for ANP in the ventricle of most specimens. Ir-ANP and ir-BNP appeared to be colocalized in many cardiocytes in the atrial wall and in some of ventricular cardiocytes. The double protein A-gold labeling technique revealed the granules showing immunoreactivity only for ANP and those showing only for BNP in the same cardiocyte of the atrium and ventricle. In addition, there were some granules showing coexistence of ir-ANP and ir-BNP.
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