title: Aldosterone regulates salivary sodium secretion in cattle.
abstract: Intravenous infusion of aldosterone (10 microgram/kg body wt per h for 5 h) in four 2-month-old calves decreased salivary and urinary sodium (Na+) concentration and increased salivary potassium (K+) concentration without modifying salivary flow or urinary K+ concentration. Intravenous angiotensin II infusion (0.3 microgram/kg body wt per min for 1 h) in four Na+-replete 16-month-old bulls decreased salivary Na+ concentration and increased that of K+. It also increased plasma cortisol and plasma aldosterone concentrations, and decreased plasma renin activity (PRA). In four 16-month-old bulls Na+ deficiency (induced by chronic cannulation of the right parotid duct and loss of saliva for 5 days) had similar effects to those observed following aldosterone infusion in calves: a decrease in salivary Na+/K+ ratio. This decrease was associated with an increase in PRA and an increase in plasma aldosterone concentration. In these animals a close positive relationship was observed between PRA and plasma aldosterone concentration (r = 0.91; n = 20; P less than 0.01). Thus in cattle, during Na+ deficiency, the effect of aldosterone on parotid glands participates in the regulation of Na+ metabolism.
mesh_terms: D000450:Aldosterone / Q000097:blood / Q000494:pharmacology*; D000804:Angiotensin II / Q000494:pharmacology; D000818:Animals; D002417:Cattle; D006854:Hydrocortisone / Q000097:blood; D008297:Male; D010306:Parotid Gland / Q000187:drug effects*; D011188:Potassium / Q000378:metabolism; D012083:Renin / Q000097:blood; D012463:Saliva / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism*
chemical_list: D000804:Angiotensin II; D000450:Aldosterone; D012964:Sodium; D012083:Renin; D011188:Potassium; D006854:Hydrocortisone