选择性κ阿片激动剂K-Ⅱ与U-50488的药理作用比较

K-Ⅱ系k阿片激动剂U-50488的同类物。通过部分离体和整体实验比较了K-Ⅱ与U-50488的药理作用。实验发现,K-Ⅱ抑制电刺激兔输精管收缩的IC₅₀值为0.42 nmol/L,U-50488为26.5 nmol/L;K-Ⅱ抑制小鼠运动功能(横筛法)的ED₅₀值为1.7 mg/g,U-50488为15.3 mg/kg;K-Ⅱ的小鼠LD₅₀值为152.5 mg/kg,U-50488为118.4 mg/g;K-Ⅱ明显降低小鼠自发活动的作用比U-50488强5倍。结果表明,K-Ⅱ是一个药理作用较U-50488强的k受体激动剂。     

反-2-(3,4-二氯苯基)-N-甲基-N-〔2-(1-吡咯烷基)环己基〕乙酰胺盐酸盐的合成

反-2-(3,4-二氯苯基)-N-甲基-N-〔2-(1-吡咯烷基)环己基〕乙酰胺盐酸盐(U-50488H,1)是近年国外报道的一个高选择性K-型阿片受体激动剂。动物实验结果表明1     

阿片受体拮抗剂狄普诺芬对内毒素休克狗血液动力学的影响

研究观察纳洛酮和狄普诺芬(M5050)对大肠杆菌内毒素休克狗血液动力学指标的影响。静脉注射纳洛酮(2mg/kg)和侧脑室注射M5050(40μg/狗),明显增加内毒素休克狗左心室内压、左心室内压最大上升速度、心脏每搏量及心输出量,平均动脉血压也显著回升。静脉注射M5050(2mg/kg)对内毒素休克狗血液动力学指标无明显作用。结果表明M5050改善内毒素休克狗的血液动力学的作用部位似在中枢神经系统,提示内毒素休克时中枢的内源性阿片样物质在休克发病学中的作用可能更为重要。     

3,4-二氯-N-甲基-N-[反式-2-(1-△3-吡咯啉基)环己基]-苯乙酰胺盐酸盐的合成及其镇痛活性的研究

3, 4-Dichloro-N-methyl-N-[trans-2- (1-△³-pyrrolinyl)-cyclohexyl]-benzenacetamide hydrochloride (K-Ⅱ) was synthesized from N-methyl-7-azabicyclo [4.1.0] heptane by treatment with 2,5-dihydropyrrole to give N-[trans-2(1-△³-pyrrolinyl)-cyclohexyl]-N-methylamine which was amidated with 3,4-dichlorophenyl-acetic acid. K-Ⅱ is an analogue of U-50488 H(K-Ⅰ), a known kappa receptor agonist.The results of animal tests showed that K-Ⅱ is 3 times as potent as K-Ⅰ as an analgesic in the mouse hot plate test and 5 times in the mouse writhing test and that the affinity of K-Ⅱ for kappa receptor may be higher than that of K-Ⅰ. The general behavioural effects of these two agents are similar in mice.     

3,4-二氯-N-甲基-N-[反式-2-(1-△~3-吡咯啉基)环己基]-苯乙酰胺盐酸盐的合成及其镇痛活性的研究

U-50488H(K-Ⅰ)是国外近年来报道的一个高选择性的K-阿片受体激动剂,动物实验结果表明:该化谷物有较强的镇痛活性,且成瘾性较低、呼吸抑制较弱、无吗啡样毒副作用的新型麻醉镇痛剂。为了寻找一个对K-受体亲和性比U-50488H更大,而选择性与其相当的K-阿片受体激动剂,我们合成了3,4-二氯-N-甲基-N-[反式-2-(1-△-吡咯啉基)环己基]-苯乙酰胺盐酸盐(K-Ⅱ),取得了较好的结果。     

K-受体激动剂U-50488类似物的合成及其镇痛作用

本文报道了某些к-型阿片受体激动剂U-50488结构类似物的合成。在小白鼠热板试验和扭体试验的结果表明,反式环己二胺结构中2位氨基为五元环吡咯啉基时对к-活性有重要作用。以六元环氯基(哌啶基、哌嗪基,吗啉基)取代2位五元环氯基导致,к-活性降低。另外,也探讨了1位芳酰氨基结构改变对к-活性的影响。     

K—Ⅱ和U—50488H对K阿片受体亲和力的比较

3,4-Dichloro-N-methyl-N-[trans-2-(1-delta 3-pyrrolinyl)-cyclohexyl] benzenacetamide hydrochloride (K-II) is a novel analogue of U-50488H. Previous studies have demonstrated that K-II is more potent than U-50488H in analgesic activity in mice and in inhibitory effect on electrically induced contractions of the isolated rabbit vas deferens. In this paper, we determined the affinities of K-II and U-50488H for kappa opiate receptor in guinea pig cerebellum and frontal cortex using radioreceptor binding assay (saturation studies and competition studies), and calculated Ki values of K-II and U-50488H by the Cheng-Prusoff equation. The results indicate that the affinity of K-II for kappa opiate receptor is 6-42 times greater than that of U-50488H. The selectivity of K-II for opiate receptor subtypes is being studied.     

N-[反式-2-(3,4-~3H-吡咯基)-环己基]-N-甲基-3,4-二氯-苯乙酰胺盐酸盐的合成

N-[反式-2-(1-吡咯基)环己基]-N-甲基-3,4-二氯-苯乙酰胺盐酸盐(简称U-50488H(K-I))是近年来报道的高选择性的K-阿片受体激动剂,动物实验结果表明:该化合物具有较强的镇痛活性,且成瘾性较低,呼吸抑制较弱,无吗啡样副作用的新型麻醉镇痛剂。为研究它的药理作用,我们用氚标记了U-50488(K-I)。合成该化合物开始原料是N-甲基-反式-2-(1-△~3-吡咯啉基)环己基胺,按一般还原法以氧化铂为催化剂,通氚进行氚化反应,未经分离与3,4一二氯苯乙酸在二环己基碳二亚胺(DCC)存在下进行缩合脱水反应,生成N-[反式-2-(3,4-~3H-吡咯基)环己基]-N-甲基-3,4-二氯-苯乙酰胺,再用氯化氢乙醚处理,制得了氚化的U-50488(K-I)。合成途径如下:     

K-Ⅱ和U-50488H对κ阿片受体亲和力的比较

3,4-二氯-N-甲基-N-[反式-2-(1-△³-吡咯啉基)环己基]苯乙酰胺(K-Ⅱ)是新合成的U-50488H类似物,其对小鼠的镇痛效应和对离体兔输精管的抑制作用均比U-50488H强。本文用放射受体结合试验方法对这两种化合物在富含x阿片受体的豚鼠小脑和大脑皮层前叶上的亲和力进行了比较,并求出这两种化合物的Ki值.结果表明K-Ⅱ对k阿片受体的亲和力比U-50488H强6～42倍。K-Ⅱ对阿片受体亚型选择性比较研究正在进行中。