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应用核团微量注射、放射免疫测定（ＲＩＡ）和高压液相（ＨＰＬＣ）观察了刺激视上核（ＳＯＮ）对蓝斑（ＬＣ）灌流液中催产素（ＯＴ）、精氨酸加压素（ＡＶＰ）、去甲肾上腺素（ＮＥ）和５－羟色胺（５－ＨＴ）的含量的变化以及蓝斑注射ＯＴ和ＡＶＰ的拮抗剂对痛阈（ＰＴ）的影响。结果表明：刺激ＳＯＮ后３０到９０ｍｉｎ，ＬＣ灌流液中ＯＴ的含量，３０ｍｉｎＡＶＰ的含量，６０ｍｉｎ５－ＨＴ的含量明显增加，而ＮＥ的含量在３０和６０ｍｉｎ时明显降低。注射ＡＶＰ的Ｖ１拮抗剂到ＬＣ对注射Ｌ－谷氨酸到ＳＯＮ引起的镇痛作用无影响，Ｖ２拮抗剂可部分抑制和ＯＴ拮抗剂可翻转刺激ＳＯＮ引起的镇痛作用。以上结果提示刺激ＳＯＮ引起的镇痛作用可能是由于ＳＯＮ释放的ＯＴ通过作用于ＬＣ内的ＯＴ和Ｖ２受体使ＬＣ内的５－ＨＴ增加和ＮＥ降低而产生的。
The effect of supraoptic nucleus (SON) on oxytocin (OT), arginine vasopressin (AVP), norepinephrine (NE) and serotonin (5-HT) levels in rats and the effect of locus coeruleus OT and AVP antagonists on pain threshold (PT). The results showed that the contents of OT, 30 min and 60 min 5-HT in LC perfusate increased significantly from 30 to 90 min after stimulating SON, while the content of NE significantly decreased at 30 and 60 min. The injection of V1 antagonist of AVP into LC had no effect on the analgesic effect caused by injection of L-glutamic acid to SON, while V2 antagonist partially inhibited the analgesic effect of OT antagonist reversible stimulation of SON. The above results suggest that the stimulation of the analgesic effect caused by SON may be due to the OT released by SON resulting from increased 5-HT and NE reduction in the LC by acting on the OT and V2 receptors within the LC.