Clonidine,moxonidine,folic acid,and mecobalamin improve baroreflex function in stroke-prone,spontaneously hypertensive rats  

作　　者：Xiu-juan MA Fu-ming SHEN Ai-jun LIU Ke-yong SHI Ying-liang WU Ding-feng SU 

机构地区：[1]Department of Pharmacology, Second Military Medical University, Shanghai 200433, China [2]School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China

出　　处：《Acta Pharmacologica Sinica》2007年第10期1550-1558,共9页中国药理学报（英文版）

摘　　要：Aim： To investigate the effect of clonidine, moxonidine, folic acid, and mecobalamin on arterial baroreflex （ABR） function in stroke-prone spontaneously hypertensive rats （SHR-SP） and the possible mechanisms involved. Methods： Eighty-one SHR-SP were divided into 7 groups. Four groups were designated for the intragastric （ig） administration of clonidine （1.0 and 10.0 μg/kg）, moxonidine （0.1 and 1.0 mg/kg）, folic acid （1.0 mg/kg）, and mecobalamin （1.0 mg/kg）. Three groups were for the intracerebroventricular （icv） injection of clonidine （4 μg/4 μL）, moxonidine （5 μg/4 μL）, and mecobalamin （20 μg/4 μL）. Blood pressure （BP） was recorded in the conscious state for 30 min and baroreflex sensitivity （BRS） was determined respectively before and after drug administration. Results： Clonidine and moxonidine significantly decreased BP, prolonged the heart period （HP）, and increased BRS when administered as either ig or icy injections. Both BP and HP were unchanged by ig folic acid or mecobalamin injection. However, BRS was significantly increased by both. Conclusion： Clonidine, moxonidine, folic acid, and mecobalamin improved impaired ABR function in SHR-SP. The central mechanism was involved in this effect of either clonidine or moxonidine. Mecobalamin improved ABR function through the peripheral mechanism.Aim： To investigate the effect of clonidine, moxonidine, folic acid, and mecobalamin on arterial baroreflex （ABR） function in stroke-prone spontaneously hypertensive rats （SHR-SP） and the possible mechanisms involved. Methods： Eighty-one SHR-SP were divided into 7 groups. Four groups were designated for the intragastric （ig） administration of clonidine （1.0 and 10.0 μg/kg）, moxonidine （0.1 and 1.0 mg/kg）, folic acid （1.0 mg/kg）, and mecobalamin （1.0 mg/kg）. Three groups were for the intracerebroventricular （icv） injection of clonidine （4 μg/4 μL）, moxonidine （5 μg/4 μL）, and mecobalamin （20 μg/4 μL）. Blood pressure （BP） was recorded in the conscious state for 30 min and baroreflex sensitivity （BRS） was determined respectively before and after drug administration. Results： Clonidine and moxonidine significantly decreased BP, prolonged the heart period （HP）, and increased BRS when administered as either ig or icy injections. Both BP and HP were unchanged by ig folic acid or mecobalamin injection. However, BRS was significantly increased by both. Conclusion： Clonidine, moxonidine, folic acid, and mecobalamin improved impaired ABR function in SHR-SP. The central mechanism was involved in this effect of either clonidine or moxonidine. Mecobalamin improved ABR function through the peripheral mechanism.

关 键 词：CLONIDINE MOXONIDINE folic acid MECOBALAMIN arterial baroreflex stroke-pronespontaneously hypertensive rats 

分 类 号：R96[医药卫生—药理学]