title: Pro-atrial natriuretic peptide (1-98): the circulating cardiodilatin in man.
abstract: The nature of plasma cardiodilatin, the amino-terminal product of the human pro-atrial natriuretic peptide, was investigated by two separate radioimmunoassays directed against the N-terminal and the putative C-terminal of the cardiodilatin molecule: ANP-[Asn1-Lys16] and ANP-[Lys87-Arg98], respectively. Serial dilutions of normal and cardiac failure plasma exhibited parallelism with the synthetic peptide standard curves in both assays. The concentrations of N- and C-terminal cardiodilatin-immunoreactivity equivalents (-IE) were significantly higher in cardiac failure patients. N-terminal-IE: 912 +/- 87, normal subjects 129 +/- 13 (mean +/- SEM); C-terminal-IE: 7979 +/- 1784, normal subjects 895 +/- 213 (both p less than 0.001). Although the concentrations determined by the two assays were not identical, significant correlations were found between them in both normal subjects (r = .69, p less than 0.001) and cardiac failure patients (r = .72, p less than 0.01). Characterisation by gel permeation and fast protein liquid chromatography demonstrated coelution of the N- and C-terminal cardiodilatin immunoreactivities in a single chromatographic peak. These results suggest that the circulating cardiodilatin in normal subjects and patients with cardiac failure contains the entire prohormone amino-terminal sequence ANP-[Asn1-Arg98].
authors.affiliation: Department of Medicine, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK.
authors.forename: L
authors.initials: L
authors.lastname: Meleagros
authors.forename: M A
authors.initials: MA
authors.lastname: Ghatei
authors.forename: J S
authors.initials: JS
authors.lastname: Gibbs
authors.forename: S R
authors.initials: SR
authors.lastname: Bloom
mesh_terms: D000328:Adult; D000368:Aged; D009320:Atrial Natriuretic Factor / Q000097:blood* / Q000302:isolation & purification; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D002908:Chronic Disease; D006333:Heart Failure / Q000097:blood*; D006801:Humans; D008875:Middle Aged; D010446:Peptide Fragments; D011498:Protein Precursors / Q000097:blood* / Q000302:isolation & purification; D011863:Radioimmunoassay / Q000379:methods; D012016:Reference Values
chemical_list: D010446:Peptide Fragments; D011498:Protein Precursors; C055659:atrial natriuretic factor prohormone (1-98); D009320:Atrial Natriuretic Factor