Abstract
Atrial natriuretic peptide (ANP) concentrations in the cerebrospinal fluid (CSF) and plasma of canine were 2.1 +/- 1.1 pg/ml (mean +/- S.D.) and 53.1 +/- 21.1 (n = 20), respectively. The regression coefficient between these concentrations was -0.0045 (P = n.s.). The ANP concentration in the CSF did not change even after the plasma ANP concentration was altered following the change of left atrial pressure, as in 4 cases of an experimental aortic regurgitation. Thus, ANP concentration in the CSF is not influenced by ANP concentrations in the plasma at least under our condition. Gel permeation chromatography revealed a single form of ANP in the position of authentic alpha-ANP in canine CSF, while a high molecular weight ANP peak was observed as well as alpha-ANP in the plasma.
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