[Renoprotective effect of iptakalim hydrochloride in hypertension].
OBJECTIVE
To investigate the experimental therapeutic effects of iptakalim hydrochloride (Ipt) on renoprotection in spontaneously hypertensive rats.


METHODS
30 SHR were treated ig with Ipt 1, 3, 9 mg.kg(-1).d(-1), benazepril 3 mg.kg(-1).d(-1) once a day for 12 weeks. Age-matched WKY rats were used as normal control. The blood pressure, heart rates, proteinuria were assessed, and renal tissues were examined by light microscopy. The levels of blood and renal tissue ET-1 and TGF-beta1 were detected respectively by radioimmunoanalysis and enzyme linked immune absorption assay (ELISA).


RESULTS
During 12 weeks experimental period, the systolic blood pressure (SBP) and heart rates (HR) of the untreated SHR were increased progressively. Ipt (3, 9 mg.kg(-1).d(-1)) could decrease effectively and inhibit the increasing tendency of HR. In addition, Ipt (1, 3, 9 mg.kg(-1).d(-1)) reduced urinary proteinuria, alleviated obviously the small vascular remodeling of renal and decreased the levels blood and renal ET-1 and TGF-beta1. Ipt (3, 9 mg.kg(-1).d(-1)) alleviated obviously the small vascular remodeling of renal compared with Ipt (1 mg.kg(-1).d(-1)).


CONCLUSIONS
Ipt (1, 3, 9 mg.kg(-1).d(-1)) decreased SBP and protected the kidney of SHR. The renoprotection of Ipt may be involved in inhibiting of blood and renal tissue ET-1 and TGF-beta1.
Xue
Hao
H
Department of Cardiology, General Hospital of PLA, Beijing 100853, China.
Liu
Guo-shu
GS
Wang
Hai
H
D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D019332:Endothelin-1 / Q000378:metabolism; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006973:Hypertension / Q000188:drug therapy*; D007668:Kidney / Q000187:drug effects*; D008297:Male; D011437:Propylamines / Q000494:pharmacology*; D051381:Rats; D011918:Rats, Inbred SHR; D011921:Rats, Inbred WKY; D016212:Transforming Growth Factor beta / Q000378:metabolism
D000959:Antihypertensive Agents; D019332:Endothelin-1; C502260:N-(1-methylethyl)-1,1,2-trimethylpropylamine; D011437:Propylamines; D016212:Transforming Growth Factor beta