title: CGP 22979A, a renal vasodilator with natriuretic properties.
abstract: Renal vasodilation might be an interesting new antihypertensive principle. In the present study, the prodrug approach was adopted to synthesize a preferential renal vasodilator. A hydralazine-like compound, CGP 18137A (2-hydrazino-5-n-butyl-pyridine), was substituted with an N-acetyl-gamma-glutamyl residue. The resulting derivative, CGP 22979A [N-acetyl-L-glutamic acid-N[N2-(5-n-butyl-2-pyridyl)hydrazide]], was inactive in the isolated perfused mesenteric artery, whereas the parent compound induced a dose-dependent inhibition of vasoconstrictor stimuli. When administered i.v. to anesthetized rats in doses between 1.0 and 10.0 mg/kg, CGP 22979A increased renal blood flow significantly, by up to 31% without affecting blood pressure. A dose of 4.0 mg/kg lowered renal vascular resistance by 25% but did not alter total systemic, mesenteric and iliac vascular resistance. A dose of 10.0 mg/kg increased glomerular filtration rate by up to 42%. In conscious rats, the same dose increased sodium excretion by 200%. Because CGP 22979A induces renal vasodilation in rats and has a preferential action on the afferent arterioles, it might be a useful tool for studying the antihypertensive potential of renal vasodilation.
mesh_terms: D000818:Animals; D001783:Blood Flow Velocity; D004232:Diuretics; D005260:Female; D005919:Glomerular Filtration Rate / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects; D006834:Hydrazines / Q000494:pharmacology*; D007083:Iliac Artery / Q000187:drug effects; D066298:In Vitro Techniques; D007668:Kidney / Q000098:blood supply / Q000187:drug effects*; D008297:Male; D008638:Mesenteric Arteries / Q000187:drug effects; D009318:Natriuresis / Q000187:drug effects*; D051381:Rats; D011919:Rats, Inbred Strains; D014655:Vascular Resistance / Q000187:drug effects; D014665:Vasodilator Agents / Q000494:pharmacology*
chemical_list: D004232:Diuretics; D006834:Hydrazines; D014665:Vasodilator Agents; C044760:N-acetylglutamic acid-N-(N(2)-(5-n-butyl-2-pyridyl)hydrazide); C044759:2-hydrazino-5-n-butylpyridine