期刊
NEUROPEPTIDES
卷 47, 期 5, 页码 297-304出版社
CHURCHILL LIVINGSTONE
DOI: 10.1016/j.npep.2013.09.001
关键词
Endomorphins; C-terminal amide; mu-Opioid receptor; Colonic contraction and propulsion; Antinociception
资金
- National Natural Science Foundation of China [20932003, 21272102, 31100562]
- Ministry of Science and Technology [2012ZX09504001-003]
- State Key Laboratory of Urban Water Resource and Environment-HIT [ES201201]
- China Postdoctoral Science Foundation [20110491072, 2012T50337]
- Heilongjiang Postdoctoral Sustentation Found [LBH-Z11132]
Previously, we have synthesized an endomorphin-2 (EM-2) analog with C-terminal amide to hydrazide conversion, exhibiting slightly lower mu-affinity than EM-2. In the present study, the influence of C-terminal amide group to hydrazide conversion on the in vitro and in vivo opioid activities of EMs was evaluated. Our results demonstrated that C-terminal amide to hydrazide conversion of EMs did not markedly change their mu-opioid receptor binding affinities. Nevertheless, EM-2-NHNH2 decreased guinea pig ileum (GPI) and mouse vas deferens (MVD) potencies by about 10- and 5-fold compared to the parent compound, respectively. It is noteworthy that EM-1-NHNH2 exhibited the highest antinociception after intra-cerebroventricular (i.c.v.) injection, about 1.5-fold more potent than EM-1, but with moderate colonic contractile and expulsive effects, comparable with EM-1. Additionally, though EM-2-NHNH2 showed a slightly lower antinociceptive effect than EM-2, at higher doses (i.c.v., 1.5 and 5 nmol/mouse) the inhibitory effects of colonic propulsion were significantly attenuated, which would be helpful in the development of suitable mu-opioid therapeutics, but without some undesirable side effects. Therefore, the present results gave the evidence that C-terminal amide to hydrazide conversion of EMs may play an important role in the regulation of opioid activities. (C) 2013 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据