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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Rat atrial natriuretic peptide vascular receptor: effect of alterations in sodium balance and of DOC hypertension.

The effect of changes in dietary sodium intake and of DOC hypertension on plasma atrial natriuretic peptide (PANP), and affinity (Kd) and number (Bmax) of vascular atrial natriuretic peptide binding sites was studied in the rat. There was no difference in PANP between rats on a high or low sodium intake [33.2 +/- 13.9 versus 30.7 +/- 17.3 (s.d.) fmol/ml], Kd [21.1 +/- 2.7 versus 19.7 +/- 4.5 (s.d.) pmol/l] or Bmax [14.8 +/- 1.6 versus 12.6 +/- 1.8 (s.d.) fmol/mg], respectively. In DOC hypertensive rats, PANP was increased compared with control animals [66.1 +/- 32.4 versus 26.4 +/- 9.9 (s.d.) fmol/ml, P less than 0.05] and there was apparent receptor down-regulation [Bmax 7.7 +/- 1.6 versus 19.7 +/- 3.5 (s.d.) fmol/mg, P less than 0.05] with no change in affinity [Kd 15.6 +/- 3.9 versus 18.3 +/- 3.2 (s.d.) pmol/l]. Down-regulation was confirmed when the membrane-bound enzyme 5'-nucleotidase, rather than protein, was used as an index of receptor number. These results suggest that in the rat, atrial natriuretic peptide ( ANP) may be important in regulating cardiovascular homeostasis only following non-physiological alterations in sodium and volume status.[1]


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