Synthesis and Pharmacological Evaluation in Mice of New Non-classical Antinociceptive Agents, 5-(4-Arylpiperazin-1-yl)-4-benzyl-1,2-oxazin-6-ones.
作者:Monique BEBOT、Pascal COUDERT、Catherine RUBAT、Danielle VALLEE-GOYET、Daniel GARDETTE、Sylvie MAVEL、Eliane ALBUISSON、Jacques COUQUELET
DOI:10.1248/cpb.45.659
日期:——
Several 5-(4-arylpiperazin-1-yl)-4-benzyl-1, 2-oxazin-6-ones have been synthesized and tested for analgesic activity in a visceral pain model (phenylbenzoquinone-induced writhing test=PBQ test). A good correlation has been found between the antinociceptive effects of drugs and both their lipophilic and steric properties. The most active derivatives 5c and 5f, with intraperitoneal ED50 values of 10.5 and 10.3 mg kg-1 respectively, were more extensively investigated by evaluating their analgesic activity in a somatosensory pain model (hot plate test), as well as their sedative properties. Furthermore, naloxone suppressed the effect of 5c and 5f in the PBQ test, though these derivatives were ineffective to potentiate morphine analgesia. Pretreatment with yohimbine did not significantly attenuate the analgesic effects of 5c and 5f. In addition, pretreatment with 5-hydroxytryptophan associated with carbidopa also failed to potentiate the antinociceptive effects of 5c and 5f. So, a part of the analgesic activity of 5c and 5f seems to be related to an opioidergic mechanism, especially at the μ receptor level. Molecular modeling studies performed on the opiate drug morphine and on the most stable conformer of 5f showed structural similarities between these two molecules.
合成了几种5-(4-芳基哌嗪-1-基)-4-苄基-1,2-恶嗪-6-酮,并在内脏疼痛模型(苯基苯醌诱导的扭动试验= PBQ试验)中测试了其镇痛活性。研究发现,药物的抗痛觉效果与其亲脂性和立体性质之间存在良好的相关性。最活跃的衍生物5c和5f的腹腔ED50值分别为10.5和10.3 mg kg^-1,因此对其镇痛活性进行了更深入的研究,包括在体感疼痛模型(热板试验)中的评估,以及其镇静特性。此外,纳洛酮抑制了在PBQ试验中5c和5f的效果,尽管这些衍生物对增强吗啡的镇痛效果并无效。用优恩宾预处理并未显著减弱5c和5f的镇痛效果。此外,与卡比多巴共同预处理的5-羟色胺也未能增强5c和5f的抗痛觉效果。因此,5c和5f的部分镇痛活性似乎与阿片机制有关,特别是在μ受体水平上。对阿片类药物吗啡和5f最稳定构象进行的分子建模研究显示这两种分子之间存在结构相似性。