摘要
在清醒大鼠上,可进中枢的N受体拮抗剂美加明可对抗N受体激动剂烟碱降低体温的作用,增强M受体激动剂氧化震颤素降低体温的作用;不进中枢的外周N受体拮抗剂六甲溴铵不影响烟碱和氧化震颤素的上述作用.每天3次sc烟碱2.5mg·kg-1,连续7d,大鼠对烟碱降低体温的作用产生慢性耐受后,氧化震颤素降低体温的作用无显著变化.提示以体温变化为指标,美加明封闭中枢N受体功能后,中枢M受体对其激动剂的敏感性增强;反复给予烟碱诱导中枢N受体功能失敏后,中枢M受体对其激动剂的敏感性无显著变化.
In conscious rats, the hypothermic effects of nicotine could be prevented by central nicotinic antagonist mecamylamine rather than by peripheral nicotinic antagonist hexamethonium and muscarinic antagonist atropine and methylatropine. The hypothermic effects of muscarinic agonist oxotremorine could be prevented by central muscarinic antagonist atropine rather than by peripheral muscarinic antagonist methylatropine, and could be potentiated by mecamylamine rather than by hexamethonium. In addition, chronic tolerance to nicotine's effects for producing hypothermia was developed by repeated administration with nicotine at a dose of 2 5 mg/kg sc 3 doses a day for 7 days, and the hypothermic effects of oxotremorine remained unchanged. It indicated that the sensitivity of brain muscarinic receptor to its agonist for producing hypothermia could be potentiated with brain nicotinic receptor blockade by mecamylamine rather than with brain nicotinic receptor desensitization by nicotine.
出处
《中国药理学与毒理学杂志》
CAS
CSCD
北大核心
1996年第1期28-30,共3页
Chinese Journal of Pharmacology and Toxicology
关键词
中枢神经
体温调节
N受体
M受体
丘脑
nicotine
receptors, cholinergic
thalamus
hypothalamus
body temperature regulation