title: [Natriuretic factors].
abstract: There appears to be two distinct natriuretic factors. One group, suspected since 1951 in overloaded dogs, had a low molecular weight: it belongs great affinity for ouabain, binds to digoxin antibodies and inhibits NA-K ATPase; this group seems heterogeneous in spite of the extraction of an amino glucosteroid-like substance from human urines. These factors are vasoconstrictor; the source is not still well known (hypothalamus ?). The atrial natriuretic factor (ANF) is a peptide about 20 to 25 amino acids and comes from a precursor of 152 amino acids, its synthesis was successful; secreted in the plasma from endocrine atrial granules, it causes striking natriuresis and diuresis and relaxes vascular and intestinal smooth muscle; it acts on guanylate cyclase but its renal mechanism of action is not well known; it constitutes an antagonist axe to ADH and RAA system. The relations between the two groups of natriuretic factors do not seem still very clear.
mesh_terms: D000818:Animals; D009320:Atrial Natriuretic Factor / Q000378:metabolism / Q000494:pharmacology / Q000502:physiology*; D055598:Chemical Phenomena; D002621:Chemistry; D006801:Humans; D045283:Natriuretic Agents / Q000494:pharmacology / Q000502:physiology*
chemical_list: D045283:Natriuretic Agents; D009320:Atrial Natriuretic Factor
vernacular_title: Facteurs natriurétiques.