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Title: Decreased atrial natriuretic peptide binding in renal medulla in rats with chronic heart failure.
Austin Authors: Tsunoda, K;Mendelsohn, Frederick AO;Sexton, P M;Chai, Syn Y;Hodsman, G P;Johnston, Colin I
Affiliation: University of Melbourne Department of Medicine, Austin Hospital, Heidelberg, Victoria, Australia
Issue Date: 1-Jan-1988
Publication information: Circulation Research; 62(1): 155-61
Abstract: The relations between atrial natriuretic peptide (ANP) binding sites in the renal medulla, plasma ANP concentration, and ventricular dysfunction have been studied in rats 4 weeks after myocardial infarction induced by left coronary artery ligation. Plasma ANP concentration was measured by radioimmunoassay, and quantitation of receptors was performed by computerized in vitro autoradiography with 125I-labeled alpha-rat ANP (1-28) as the radioligand. When compared with controls, rats with myocardial infarction had markedly elevated plasma immunoreactive ANP concentrations (462 +/- 82 versus 124 +/- pg/ml, p less than 0.01) and reduced densities of ANP binding in the inner renal medulla (2.93 +/- 0.19 versus 3.53 +/- 0.22 fmol/mg protein, p less than 0.01). Extensive myocardial infarction was associated with a significant decrease in receptor numbers in the inner medulla (33.6 +/- 5.7 versus 95.6 +/- 9.6 fmol/mg protein, p less than 0.01) without significantly altering the affinity constant (1.76 +/- 0.51 versus 1.03 +/- 0.15 x 10(9) M-1, p greater than 0.05). Right ventricular weight increased in proportion to infarct size (r = 0.71, p less than 0.01), and both were correlated with plasma immunoreactive ANP levels (r = 0.74, p less than 0.01 and r = 0.75, p less than 0.01, respectively). Binding densities in the inner medulla of rats with infarcts were negatively correlated with right ventricular weight, plasma immunoreactive ANP concentrations, and also with infarct size (r = -0.92, p less than 0.001; r = -0.78, p less than 0.001; r = -0.77, p less than 0.01, respectively).(ABSTRACT TRUNCATED AT 250 WORDS)
Gov't Doc #: 2826040
Type: Journal Article
Subjects: Animals
Atrial Natriuretic Factor.metabolism
Coronary Disease.metabolism
Kidney Medulla.metabolism
Myocardial Infarction.metabolism
Organ Size
Rats, Inbred Strains
Receptors, Atrial Natriuretic Factor
Receptors, Cell Surface.metabolism
Appears in Collections:Journal articles

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