使用自然存在的氨基酸替代物的丁诺芬B变体的结构功能关系
Luca Zangrandi1,2, Barbara Fogli1, Anna Mutti1
1Institute of Pharmacology, Medical University of Innsbruck, Innsbruck, Austria.
Frontiers in pharmacology
|November 14, 2024
概括
研究人员开发了新的迪诺芬B (DynB) 变体,对卡帕阿片类受体 (KOPrs) 具有增强的选择性. 这些DynB衍生物通过最小化与其他阿片类受体的不必要相互作用,显示出有针对性的治疗效果的潜力.
科学领域:
- 药理学和药物化学 药理学和药物化学
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- 迪诺芬 (Dyn) 是内源性阿片类,对卡帕阿片类受体 (KOPrs) 具有很高的亲和力,调解抗作用.
- 迪恩还与mu (MOPrs) 和delta阿片类受体 (DOPrs) 相互作用,可能导致不良副作用.
- 优化迪诺芬治疗需要增强KOPr选择性和减少mTOR通路激活.
研究的目的:
- 设计和特征化dynorphin B (DynB) 变种,以提高KOPrs对MOPrs和DOPrs的选择性.
- 研究特定氨基酸替代对阿片类受体结合亲和力和信号转导的影响.
- 评估新型DynB衍生物的功能选择性和mTOR路径激活.
主要方法:
- 用单或双氨基酸替代合成DynB变体.
- 竞争性无线电结合测试以确定受体亲和力.
- 用GTPγS测定,PRESTO-Tango和西式涂抹来评估G蛋白和β-止素通路激活和mTOR信号传递.
主要成果:
- 与MOPrs或DOPrs相比,七种DynB衍生品对KOPrs具有至少10倍的选择性.
- DynB_G3M/Q8H显示KOPrs对MOPrs的选择性最高;DynB_L5S显示KOPrs对DOPrs的选择性最高.
- 选择性增长是由于MOPrs/DOPrs的亲和力/功效降低而产生的,而不是KOPrs的亲和力增加;没有DynB变体显示出增强的功效或功能选择性.
结论:
- 3,5,8位的氨基酸替代物显著影响MOPr和DOPr的结合和激活.
- 成功生成了具有增强KOPr选择性的Dynorphin B变体.
- 仅受体亲和性就不足以预测激素激剂的强度或疗效;下游途径的评估对于预测体内效应至关重要.
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