title: Cilnidipine attenuates renal nerve stimulation-induced renal vasoconstriction and antinatriuresis in anesthetized dogs.
abstract: We examined the effects of cilnidipine, which is an L- and N-type Ca2+ channel blocker, on adrenergically regulated renal functions in anesthetized dogs. Renal nerve stimulation (RNS) at high frequency (3-7 Hz) decreased renal blood flow (RBF) without changes in systemic blood pressure. The RBF response was inhibited by intrarenal arterial (i.r.a.) infusion of cilnidipine at 0.1-0.3 microgram/kg/min. Low-frequency RNS (0.5-1 Hz) reduced absolute and fractional urinary sodium excretion. These responses were attenuated during i.r.a. infusion of cilnidipine at 0.3 microgram/kg/min. An increase in norepinephrine secretion rate induced by low-frequency RNS was also attenuated during cilnidipine infusion. These results suggest that cilnidipine can suppress norepinephrine release from the renal nerve endings and thereby interfere with the neural control of renal functions.
authors.affiliation: Life Science Laboratories, Ajinomoto Co., Inc., Yokohama, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Takahara
authors.forename: H
authors.initials: H
authors.lastname: Dohmoto
authors.forename: H
authors.initials: H
authors.lastname: Hisa
authors.forename: S
authors.initials: S
authors.lastname: Satoh
authors.forename: R
authors.initials: R
authors.lastname: Yoshimoto
mesh_terms: D000758:Anesthesia; D000804:Angiotensin II / Q000494:pharmacology; D000818:Animals; D002121:Calcium Channel Blockers / Q000008:administration & dosage / Q000494:pharmacology*; D004095:Dihydropyridines / Q000008:administration & dosage / Q000494:pharmacology*; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D004558:Electric Stimulation; D007668:Kidney / Q000294:innervation*; D008297:Male; D009318:Natriuresis / Q000187:drug effects*; D009638:Norepinephrine / Q000494:pharmacology; D013564:Sympathetic Nervous System / Q000187:drug effects; D014661:Vasoconstriction / Q000187:drug effects*; D014662:Vasoconstrictor Agents / Q000494:pharmacology
chemical_list: D002121:Calcium Channel Blockers; D004095:Dihydropyridines; D014662:Vasoconstrictor Agents; D000804:Angiotensin II; C065927:cilnidipine; D009638:Norepinephrine