title: Effects of endothelin on renal haemodynamics and segmental sodium handling in conscious rats.
abstract: The effects of endothelin (100 and 600 pmol/kg) on renal plasma flow (RPF), glomerular filtration rate (GFR), sodium excretion (UNa V) and segmental sodium handling were investigated in conscious rats. Low-dose endothelin decreased renal plasma flow by 26% without affecting glomerular filtration rate and sodium excretion. High-dose endothelin reduced renal plasma flow, glomerular filtration rate, sodium excretion and lithium clearance by 57, 45, 38 and 52%, respectively. The fall in sodium excretion was not due to a direct effect of endothelin on tubular sodium transport since sodium excretion corrected by glomerular filtration rate and fractional proximal and distal sodium reabsorption did not change throughout the study. These results indicate that the impairment in renal perfusion is responsible for the antinatriuretic effect of endothelin in conscious rats.
authors.affiliation: Hormonal Laboratory Hospital Clínic i Provincial, Barcelona, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Claria
authors.forename: W
authors.initials: W
authors.lastname: Jimenez
authors.forename: G
authors.initials: G
authors.lastname: La Villa
authors.forename: M
authors.initials: M
authors.lastname: Asbert
authors.forename: A
authors.initials: A
authors.lastname: Castro
authors.forename: J L
authors.initials: JL
authors.lastname: Llibre
authors.forename: V
authors.initials: V
authors.lastname: Arroyo
authors.forename: F
authors.initials: F
authors.lastname: Rivera
mesh_terms: D000818:Animals; D016232:Endothelins / Q000494:pharmacology*; D005919:Glomerular Filtration Rate; D007668:Kidney / Q000187:drug effects* / Q000378:metabolism; D008094:Lithium / Q000652:urine; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012079:Renal Circulation / Q000187:drug effects*; D012964:Sodium / Q000652:urine*
chemical_list: D016232:Endothelins; D008094:Lithium; D012964:Sodium