作者:Paula Salgado、Diogo da Fonsêca、Renan Braga、Cynthia de Melo、Luciana Andrade、Reinaldo de Almeida、Damião de Sousa
DOI:10.3390/molecules201119649
日期:——
Stereoisomers of the monoterpene epoxycarvone (EC), namely (+)-cis-EC, (−)-cis-EC, (+)-trans-EC, and (−)-trans-EC, were comparatively evaluated for anticonvulsant activity in specific methodologies. In the pentylenetetrazole (PTZ)-induced anticonvulsant test, all of the stereoisomers (at 300 mg/kg) increased the latency to seizure onset, and afforded 100% protection against the death of the animals. In the maximal electroshock-induced seizures (MES) test, prevention of tonic seizures was also verified for all of the isomers tested. However, the isomeric forms (+) and (−)-trans-EC showed 25% and 12.5% inhibition of convulsions, respectively. In the pilocarpine-induced seizures test, all stereoisomers demonstrated an anticonvulsant profile, yet the stereoisomers (+) and (−)-trans-EC (at 300 mg/kg) showed a more pronounced effect. A strychnine-induced anticonvulsant test was performed, and none of the stereoisomers significantly increased the latency to onset of convulsions; the stereoisomers probably do not act in this pathway. However, the stereoisomers (+)-cis-EC and (+)-trans-EC greatly increased the latency to death of the animals, thus presenting some protection. The four EC stereoisomers show promise for anticonvulsant activity, an effect emphasized in the isomers (+)-cis-EC, (+)-trans-EC, and (−)-trans-EC for certain parameters of the tested methodologies. These results serve as support for further research and development of antiepileptic drugs from monoterpenes.
单萜环氧石竹烯(EC)的立体异构体,即(+)-顺式-EC、(−)-顺式-EC、(+)-反式-EC和(−)-反式-EC,在特定的方法学中被比较评估其抗惊厥活性。在戊四唑(PTZ)诱导的抗惊厥测试中,所有立体异构体(300 mg/kg剂量下)均增加了发作的潜伏期,并100%保护动物免于死亡。在大电击诱导的惊厥(MES)测试中,也验证了所有测试异构体对强直性惊厥的预防作用。然而,(+)-和(−)-反式-EC分别显示出25%和12.5%的惊厥抑制作用。在毛果芸香碱诱导的惊厥测试中,所有立体异构体均表现出抗惊厥特性,然而(+)-和(−)-反式-EC(300 mg/kg剂量下)显示出更显著的效果。进行了士的宁诱导的抗惊厥测试,所有立体异构体均未显著增加惊厥发作的潜伏期;这些立体异构体可能不在此通路中发挥作用。然而,(+)-顺式-EC和(+)-反式-EC显著增加了动物的死亡潜伏期,从而显示出一定的保护作用。四个EC立体异构体显示出有前途的抗惊厥活性,在某些测试方法学的参数中,(+)-顺式-EC、(+)-反式-EC和(−)-反式-EC的效应更为突出。这些结果为从单萜类化合物中进一步研究和开发抗癫痫药物提供了支持。