Antinociceptive Activities of Some 4,5-Dihydro-1H-Pyrazole Derivatives: Involvement of Central and Peripheral Pathways
作者:Özgür Devrim Can、Feyza Alyu、Nazl| Turan、Ahmet Özdemir
DOI:10.2174/1570180812666150819003950
日期:2016.4.14
This study was planned to investigate possible antinociceptive activity of 1,5-diaryl-3-[4-
(methylsulfonyl)phenyl]-4,5-dihydro-1H-pyrazole derivatives (2a-s), based on the analgesia-inducing
potential of 4,5-dihydro-1H-pyrazole moiety carrying compounds. Tail-clip and hot-plate tests, measuring
centrally organized responses to a noxious stimulus, were performed in order to examine antinociceptive
potential of the test compounds (100 mg/kg, i.p). In addition, peripherally mediated antinociceptive
effect was evaluated by acetic acid-induced writhing tests. Motor coordination of the animals
was tested in a Rota-rod apparatus.
Among the tested compounds 2c, 2e, 2g, 2h, 2j, 2l, 2m, 2o and 2r prolonged the reaction time, measured in the tail-clip
and hot-plate tests, with respect to the control values. The same compounds also decreased the quantity of acetic acidinduced
writhing behaviours. In the Rota-rod tests, compound 2r was the only derivative decreasing the falling latency of
mice.
The obtained results indicated that some of the tested 4,5-dihydro-1H-pyrazole derivatives induce notable antinociceptive
activity by effecting both of the central and peripheral nociceptive pathways. In addition, this study provided some information
about structure-activity relationship for the compounds carrying similar chemical scaffold. Nevertheless, it should
be noted that mechanism of action for these agents should be clarified with further detailed investigations.
本研究计划根据携带 4,5-二氢-1H-吡唑分子的化合物的镇痛诱导潜力,研究 1,5-二芳基-3-[4-(甲基磺酰基)苯基]-4,5-二氢-1H-吡唑衍生物(2a-s)可能具有的抗痛觉活性。为了检测受试化合物(100 毫克/千克,静脉注射)的镇痛潜力,进行了夹尾试验和热板试验,以测量对有害刺激的中枢组织反应。此外,还通过醋酸引起的蠕动试验评估了外周介导的抗痛觉作用。与对照组相比,受试化合物中的 2c、2e、2g、2h、2j、2l、2m、2o 和 2r 延长了夹尾试验和热板试验的反应时间。这些化合物还减少了醋酸引起的蠕动行为。结果表明,一些受测的 4,5-二氢-1H-吡唑衍生物通过影响中枢和外周痛觉通路,诱导了显著的抗痛觉活性。此外,这项研究还为具有相似化学支架的化合物提供了一些有关结构-活性关系的信息。不过,应该指出的是,这些制剂的作用机制还需要进一步的详细研究才能明确。