Tseng L F, Loh H H, Li C H
Proc Natl Acad Sci U S A. 1976 Nov;73(11):4187-9. doi: 10.1073/pnas.73.11.4187.
The effects of beta-endorphin on the antinociceptive responses and abrupt withdrawal jumping in morphine-dependent mice were studied. Mice were rendered morphine dependent by implantation of a morphine pellet (75 mg base) for 3 days. The analgesic response to beta-endorphin decreased after morphine pellet implantation, as evidenced by an eight-fold increase in the median antinociceptive dose of morphine was found. In small doses (0.09-0.17 mug per mouse), beta-endorphin suppressed abrupt withdrawal jumping. Met-enkephalin, even in high doses (200 mug per mouse), did not suppress abrupt withdrawal jumping.
研究了β-内啡肽对吗啡依赖小鼠抗伤害感受反应和突然戒断跳跃的影响。通过植入吗啡丸(75mg碱)3天使小鼠产生吗啡依赖。植入吗啡丸后,对β-内啡肽的镇痛反应降低,这通过吗啡的半数抗伤害感受剂量增加了八倍得到证明。小剂量(每只小鼠0.09 - 0.17μg)的β-内啡肽可抑制突然戒断跳跃。甲硫氨酸脑啡肽,即使是高剂量(每只小鼠200μg),也不能抑制突然戒断跳跃。