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      Plasma Concentration of Brain Natriuretic Peptide as an Indicator of Cardiac Ventricular Function in Patients on Hemodialysis

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          The plasma concentration of human brain natriuretic peptide (BNP) was measured by immunoradiometric assay in patients on maintenance hemodialysis (HD) to assess the possible relationship between the plasma levels of this peptide and cardiac ventricular function, as judged by M-mode echocardiography. The plasma BNP levels in the pre-HD state were significantly higher (688.5 ± 154.5 pg/ml) than those of healthy subjects (<40 pg/ml). In addition, the plasma BNP levels were slightly decreased during HD (post-HD, 617.3 ± 157.1 pg/ml). There was no correlation between the plasma levels of BNP and body weight changes during HD. The mean plasma BNP level was significantly higher in the group of patients with a low left ventricular ejection fraction (EF < 60%) than in the group with a normal EF. In the patients as a whole, there was an inverse correlation between plasma BNP levels and EF. Moreover, a positive correlation was found between plasma BNP levels and left ventricular mass index (r = 0.57, p < 0.05). These results suggest that plasma BNP levels increase in response to chronic stimulation in accordance with increased cardiac load, and that they may be a possible indicator of reduced ventricular function in HD patients.

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          A new natriuretic peptide in porcine brain.

          Atrial natriuretic peptide (ANP), a hormone secreted from mammalian atria, regulates the homoeostatic balance of body fluid and blood pressure. ANP-like immunoreactivity is also present in the brain, suggesting that the peptide functions as a neuropeptide. We report here identification in porcine brain of a novel peptide of 26 amino-acid residues, eliciting a pharmacological spectrum very similar to that of ANP, such as natriuretic-diuretic, hypotensive and chick rectum relaxant activities. The complete amino-acid sequence determined for the peptide is remarkably similar to but definitely distinct from the known sequence of ANP, indicating that the genes for the two are distinct. Thus, we have designated the peptide 'brain natriuretic peptide' (BNP). The occurrence of BNP with ANP in mammalian brain suggests the possibility that the physiological functions so far thought to be mediated by ANP may be regulated through a dual mechanism involving both ANP and BNP.
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            Plasma brain natriuretic peptide as an indicator for angiotensin-converting-enzyme inhibition after myocardial infarction

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              Antidipsogenic action of a novel peptide, ‘brain natriuretic peptide’, in rats

              The effect of intracerebroventricular (i.c.v.) administration of brain natriuretic peptide (BNP) on water drinking was studied in rats. The i.c.v. injection of BNP at a dose of 1.5 nmol elicited no apparent change in spontaneous water intake in rats but significantly attenuated the water intake induced by the i.c.v. administration of 0.1 nmol of angiotensin II. The antidipsogenic action of BNP was comparable to that of atrial natriuretic polypeptide (ANP). These findings suggest that BNP could play a role in the regulation of water intake in the central nervous system, either alone or in concert with brain ANP.

                Author and article information

                Am J Nephrol
                American Journal of Nephrology
                S. Karger AG
                October 1998
                10 September 1998
                : 18
                : 5
                : 411-415
                Department of Medicine, a Kidney Center and b Institute of Clinical Endocrinology, Tokyo Women’s Medical College, Shinjuku-ku, Tokyo, and c Minami Senju Hospital, Arakawa-ku, Tokyo, Japan
                13385 Am J Nephrol 1998;18:411–415
                © 1998 S. Karger AG, Basel

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                Figures: 5, Tables: 1, References: 19, Pages: 5
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