Study on Vasodilatory Effect of Oxysophocarpine on Isolated Thoracic Aortic Rings of Rats and Its Mechanism
- VernacularTitle:氧化槐果碱对离体大鼠胸主动脉环的舒张作用及其机制研究
- Author:
Haiqi QIAO
1
;
Lin YAN
1
;
Yang YU
1
;
Zhi CHANG
1
;
Jialing WANG
1
;
Yanmin PEI
1
;
Ru ZHOU
1
,
2
Author Information
1. School of Pharmacy,Ningxia Medical University,Yinchuan 750004,China
2. Ningxia Modernization Engineering Technology Research Center for Hui Medicine and Ningxia Collaborative Innovation Center of Ningxia Medical University,Yinchuan 750001,China
- Publication Type:Journal Article
- Keywords:
Oxysophocarpine;
Thoracic aortic rings;
Vasodilation;
Endothelium independent;
Potassium channel;
Calcium channel;
Mechanism
- From:
China Pharmacy
2019;30(22):3057-3061
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE: To study the vasodilatory effect of oxysophocarpine (OSC) on isolated thoracic aortic rings of rats and its possible mechanism. METHODS: Thoracic aortic rings of rats were collected (called “vascular ring” for short). Using K-H nutrient solution as blank control and the diastolic rate as index, the effects of different concentrations (0.2-1.0 mg/mL) of OSC on normal vascular rings in basal state, normal or endothelium-free vascular rings pre-contracted by norepinephrine (PE, 1×10-6 mol/L) were investigated. After pre-culturing normal thoracic aortic rings by nitric oxide synthase inhibitor L-nitro-arginine methyl ester(L-NAME)and cyclooxygenase inhibitor indomethacin(INDO),as well as pre-culturing endothelium-free vascular rings by potassium ion channel blocker BaCl2,tetraethylammonium(TEA)and 4-aminopyridine(4-AP), the diastolic effects of OSC of different concentrations (0.2-1.0 mg/mL) on the above vascular rings were investigated by using the same method. RESULTS: Compared with blank control, there was no significant effects of different concentrations of OSC on the diastolic rate of normal vascular rings in basal state (P>0.05), but 0.4-1.0 mg/mL OSC could significantly improve the diastolic rate of normal or endothelium-free vascular rings pre-contracted by PE (P<0.01), in concentration-dependent manner. After preculturing with L-NAME, INDO, 4-AP and BaCl2, different concentrations of OSC had no significant effect on the diastolic rate of normal or endothelium-free vascular rings pre-contracted by PE (P>0.05). After pre-culturing with TEA and Gli, 0.4-1.0 mg/mL OSC could significantly reduce the diastolic rate of endothelium-free vas- cular rings pre-contracted by PE (P<0.01). CONCLUSIONS: OSC did not significantly dilate the thoracic aortic rings of rats in the basal state within the dose range (0.2-1.0 mg/mL), but OSC of 0.4-1.0 mg/mL have significant diastolic effects on the normal or endothelium-free thoracic aortic rings of rats pre-contracted with PE. The mechanism of thoracic aortic rings dilation is endothelium-independent, which may be associated with receptor operational calcium channel,Ca2+-activated potassium channels and ATP-sensitive potassium channels.