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Cardiac C-type natriuretic peptide gene expression and plasma concentrations in neonatal piglets.

Regul. Pept.2014 Jan 10;188:66-9. Epub 2013 Dec 27
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摘要


BACKGROUND:C-type natriuretic peptide (CNP) is a member of the natriuretic peptide family. Cardiac ANP and BNP expressions are firmly established, whereas CNP expression in the mammalian heart remains controversial. In the present report, we used a porcine model of the neonatal period with high expressions of cardiac ANP and BNP in order to elucidate the cardiac CNP expression profile. METHODS:Plasma and cardiac tissue were obtained from newborn piglets during the first 72 h of life. The chamber-specific CNP mRNA contents were quantified by real-time PCR analysis. The proCNP concentrations in plasma and cardiac tissue extracts were quantified by a porcine-specific radioimmunoassay. RESULTS:Cardiac CNP mRNA contents (n=24) were low compared to sites of known expression, where porcine seminal vesicle CNP mRNA contents were 200-fold higher. In addition, plasma proCNP concentrations in the newborn piglets (n=44) were exceedingly low compared to proANP concentrations (5.3 pmol/L (3.2-8.6) vs. 3438 pmol/L (2790-5418), p<0.0001). The proCNP concentrations in atrial tissue extracts were barely detectable (≤0.06 pmol/g) (n=2) compared to ventricular proANP (130 pmol/g (101-159)) and atrial proANP (12,303 pmol/g (10,623-15,412)). CONCLUSION:Our data show that the heart is not a major source of circulating proCNP in neonatal piglets.

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