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相关概念视频

Spare Receptors01:30

Spare Receptors

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Some receptors remain unoccupied even when an agonist produces a maximal response. Such empty ones are called spare receptors. In presence of spare receptors the maximum effect of an agonist drug is achieved with fewer than 100% of the receptors being occupied. To determine the presence of spare receptors, scientists often compare the concentration of the drug needed to produce 50% of the maximum effect (EC50) with the concentration of the drug needed to occupy 50% of the receptors (Kd). If the...
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一个神秘的口袋在CB1驱动外围和功能选择性

Vipin Ashok Rangari1,2, Evan S O'Brien3,4, Alexander S Powers3,5,6,7

  • 1Center for Clinical Pharmacology, University of Health Sciences and Pharmacy and Washington University School of Medicine, St. Louis, MO, USA.

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概括

通过向外围受体,减少副作用和耐受性,新的大麻素受体1型 (CB1) 激动剂提供更安全的慢性疼痛缓解. 这种方法可以彻底改变疼痛治疗.

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科学领域:

  • 药理学
  • 神经科学
  • 医学化学

背景情况:

  • 需要更安全的慢性疼痛治疗.
  • 大麻素受体1型 (CB1) 激动剂具有前景,但受精神活性和耐受性限制.
  • 开发局部受限的CB1激动剂对于有效的疼痛管理至关重要.

研究的目的:

  • 设计和开发具有降低精神活性和耐受性的新型,局部受限的CB1激动剂.
  • 调查潜在的偏向信号和外围选择性的分子机制.
  • 在临床前疼痛模型中评估新型CB1激动剂的止痛效果和安全性.

主要方法:

  • 积极充电的CB1激动剂的计算设计针对一个神秘的口袋.
  • 分子动力学模拟以确定结合模式和受体相互作用.
  • 结构测定和药理测定以验证配体结合和信号.
  • 在小鼠疼痛模型中对止痛功效和中心副作用的体内评估.

主要成果:

  • 通过准一个神秘的口袋,设计了局部限制的CB1激应剂,包括VIP36.
  • 在三种小鼠疼痛模型中,VIP36表现出显著的止痛效果.
  • VIP36显示疗效与主要副作用之间的剂量分离是100倍.
  • VIP36具有有限的止痛耐受性,并通过外围CB1受体起作用.

结论:

  • 在G蛋白结合受体中准神秘的口袋可以产生边缘选择性,偏向性激动剂.
  • 这种策略增强了体内药理学,并减少了慢性疼痛治疗的不良影响.
  • 这些发现对药物设计具有广泛的意义, 向G蛋白合受体和治疗慢性疼痛.