Design and Synthesis of a Novel Series of Opioid Dipeptides and Evaluation of Their Analgesic Effect in Vivo

doi:10.6023/A15090611

Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (1): 44-48.DOI: 10.6023/A15090611 Previous Articles Next Articles

Communication

一类全新阿片样二肽的设计合成及镇痛活性研究

刘鑫^a, 赵龙^a, 王媛^a, 牟凌云^a, 张艺馨^a, 周静静^a, 王锐^a,b

a 兰州大学基础医学院兰州 730000;
b 天津化学化工协同创新中心天津 300072

投稿日期:2015-09-17 发布日期:2015-10-29
通讯作者: 王锐 E-mail:wangrui@lzu.edu.cn
基金资助:
项目受国家自然科学基金(Nos. 91213302, 21402076)和中央高校基础研究基金(Nos. lzujbky-2015-168, lzujbky-2015-275)资助.

Design and Synthesis of a Novel Series of Opioid Dipeptides and Evaluation of Their Analgesic Effect in Vivo

Liu Xin^a, Zhao Long^a, Wang Yuan^a, Mou Lingyun^a, Zhang Yixin^a, Zhou Jingjing^a, Wang Rui^a,b

a School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000;
b Collaborative Innovation Center of Chemical Science and Engineering Tianjin, Tianjin 300072

Received:2015-09-17 Published:2015-10-29
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 91213302 and 21402076) and the Fundamental Research Funds for the Central Universities (Nos. lzujbky-2015-168, lzujbky-2015-275).

1. Design and Synthesis of a Novel Series of Opioid Dipeptides and Evaluation of Their Analgesic Effect in Vivo.PDF(972KB)

Abstract

The opioid system is one of the most studied pain relieving systems. Opioid peptides have been studied extensively since their discovery, and many efforts have been dedicated to the determination of their intrinsic nature. However, opioid peptides still suffer from serious limitations including lack of oral activity, short duration of action, poor metabolic stability, and relative inability to cross the blood-brain barrier (BBB). Inspired by the structure-activity studies of opioid peptides, four novel opioid dipeptides were synthesized by introduction of Tyr/Dmt to the N-termius and novel unnatural α-methylene-β-amino acids (Map) to the C-terminus. Their in vitro and in vivo activities were determined and compared. The affinity and selectivity of these dipeptides were evaluated by radioligand binding assay in whole cell preparations from HEK293 cells expressing the μ opioid receptor (MOR) or δ opioid receptor (DOR), compound 4 exhibited the highest binding affinity toward MOR, and this compound also showed the most significant MOR selectivity over DOR. Pharmacological activities were evaluated in vitro using isolated guinea pig ileum (GPI) for MOR and mouse vas deferens (MVD) for DOR, and the results of GPI and MVD were in accordance with the binding affinity assays. The antinociceptive activities of the compound 4 were assessed in the mouse tail-flick and writhing test after intracerebroventricular (i.c.v.) administration. In the two tests, compound 4 showed good ability to reduce the thermal pain and the inflammatory pain, respectively. Naloxone significantly reversed the activity of the compound, indicating that opioid receptors were involved in its analgesic effects. The compound 4 was then administered inravenously (i.v.) to determine whether this dipeptide was able to cross the BBB. As a result, compound 4 was effective in both tail-flick and writhing test after i.v. administration. Furthermore, the peripherally restricted opioid antagonist naloxone methiodide did not alter the peptide-induced antinociception. Collectively, these results indicated that compound 4 was able to cross the highly selective BBB and might elicit an analgesic response via a central mechanism. Therefore, compound 4 may be a potential lead compound for future clinical development for pain management.

Key words: opioid peptide, antinociception, structure-activity relationship, blood-brain barrier, unnatural amino acid

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Liu Xin, Zhao Long, Wang Yuan, Mou Lingyun, Zhang Yixin, Zhou Jingjing, Wang Rui. Design and Synthesis of a Novel Series of Opioid Dipeptides and Evaluation of Their Analgesic Effect in Vivo[J]. Acta Chim. Sinica, 2016, 74(1): 44-48.

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一类全新阿片样二肽的设计合成及镇痛活性研究

Design and Synthesis of a Novel Series of Opioid Dipeptides and Evaluation of Their Analgesic Effect in Vivo

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