电针大鼠“足三里”时体内催产素含量的变化

Changes of Oxytodn Content in Rats upon Electroacupuncture of “Zusanli”

采用放射免疫分析法(RIA)测定了电针“足三里”时SD大鼠脑、脊髓、垂体和肾上腺内催产素样免疫活性物质(ir-OT)含量的变化。电针双侧“足三里”30min或痛刺激2min断头取脑、核团制备匀浆,用RIA测定OT含量。电针组下丘脑视上核OT含量减少,下丘脑腹内侧核、中缝大核,杏仁核、苍白球、脊髓和肾上腺OT含量明显增加,下丘脑弓状核和中脑中央灰质OT含量也有增加,血浆OT含量有增加的趋势,下丘脑室旁核、中缝背核、蓝斑和垂体OT含量无明显变化。痛刺激组动物OT含量也有一定变化,但与电针组有所不同。上述结果表明,电针时,中枢神经系统内与调制痛觉有关的某些结构内OT含量有明显变化,这种变化具有一定的特异性。这从一个侧面为中枢神经系统内的内源性OT参与针刺镇痛提供了证据。

In this study, radioimmunoassay (RIA) was performed to measure the change of immunoreactive-oxytocin (ir-OT) content in rat brain' nuclei related pain modulation, spinal cord, pituitary, adrenal gland and plasma by electroacupuncture 'Zusanli' (EA) for 30rnin or pain stimulation for 2min. In the EA group, OT content was decreased greatly in the hypothalamic supraoptic N., while increased significantly in the hypothalamic ventromedial N., raphe magnus N., globus pallidus, spinal cord and adrenal gland, and there were no significant change in the hypothalamic paraventricular N., raphe dorsal N., locus ceruleus, pituitary arid plasma. There were also significant changes of OT content in rat brain, spinal cord and pituitary in the pain stimulation group, which are different from those of the EA group. The above results suggest that the changes of OT content in the EA group are specific, and provide evidence for involvement of endogenous OT in the central nervous system in acupuncture analgesia