摘要
本工作用１２％乙醇麻醉的大鼠，观察了下丘脑室旁核（ＰＶＨ）微量注射Ｋ型阿片受体激动剂Ｕ－５０，４８８Ｈ对大鼠肾水钠钾排出的影响，以及第三脑室注射Ｕ－５０，４８８Ｈ对ＰＶＨ中多巴胺神经元活性的影响。结果如下：（１）ＰＶＨ微量注射Ｕ－５０，４８８Ｈ（５μｎ／ｕｌ）后２０ｍｉｎ内大鼠尿量开始增加（Ｐ＜０．０１），持续约１００ｍｉｎ，４１—６０ｍｉｎ尿量增加达峰值（Ｐ＜０．００１）。（２）ＰＶＨ预先（１０ｍｉｎ）注射Ｋ型阿片受体阻断剂ＮＢＴ（Ｎｏｒ－ＢｉｎａｌｔｏｒｐｈｉｍｉｎｅＴｅｔｒａｈｙｄｒａｔｅ）（５μｇ／ｐｌ）可以阻断Ｕ－５０，４８８Ｈ所产生的利尿效应（Ｐ＜０．０１）。（３）第三脑室注射Ｕ－５０，４８８Ｈ（１０μｇ／１０ｕｌ）２０ｍｉｎ后，ＰＶＨ中酪氨酸羟化酶免疫反应阳性（Ｔｙｒｏｓｉｎｅｈｙｄｒｏｘｙｌａｓｅ－ｉｍｍｕｎｏｒｅａｃｔｉｖｉｔｙ，ＴＨ－ＩＲ）神经元数量减少，染色强度减弱，于注药后５０ｍｉｎ变化最为显著，１００ｍｉｎ时已恢复正常。上述结果表明：ＰＶＨ微量注射Ｕ－５０，４８８Ｈ可作用于Ｋ型阿片受体引起利尿效应；第三脑室微量注射Ｕ－５０，４８８Ｈ可抑制ＰＶＨ中ＴＨ－ＩＲ神经元的免疫活性。
The effect of a kappa-receptor agonist U-50, 488H on urine flow and the activity of TH-IR (tyrosine hydr oxy lase - immunoreactivity ) neur ons in PVH (Paraventricular neucleus of the hypothalamus) was studied in ethanol-anesthetized rats. U-50, 488H (5μg/1μl) injected into PVH induced a potent diuretic response with no significant acnon on mean arterial pressure and heart rate. The diuretic response began within 20 min after injection, reached a Peak value 41 - 60 min later and subsided at about 100 min. This diuretic response could be blocked by pretreatment with kapps-receptor aning onist NBT (Nor-Binaltorphimine Tetrahydrate).Both the number of neurons and staining density of TH-IR in the PVH tended to decrease at 20 min after the injection of U-50, 488H (10μg/10 μl) into the third cerebroventricle. The effect was most evident at 50 min and recovered at about 100 min after injection.
出处
《生理学报》
CAS
CSCD
北大核心
1995年第2期187-194,共8页
Acta Physiologica Sinica
基金
辽宁省教委重点学科科研项目
