单糖醇脂酶 保护预突触大麻素1受体免受持续性炎症后内大麻素的脱敏化
Courtney A Bouchet1,2, Kylie B McPherson3, Basile Coutens3
1Department of Neurological Surgery, Oregon Health & Science University, Portland, Oregon 97239.
概括
持久性炎症对大麻素受体1 (CB1R) 进行脱敏,降低外源性激动剂的疗效. 然而,内分泌大麻素表现出长时间的效果,降解对于调节腹侧周水管灰色中疼痛信号至关重要.
科学领域:
- 神经科学是一个神经科学.
- 药理学 药理学是指药理学的学科.
- 疼痛研究 疼痛研究
背景情况:
- 基于大麻的疼痛疗法正在扩大,但它们的有效性可能受炎症诱导的内分泌系统变化所限制.
- 大麻素受体1 (CB1R) 在调节疼痛通路方面发挥着关键作用,特别是通过其对腹侧周水道灰色 (vlPAG) 中的GABAergic信号传递的影响.
研究的目的:
- 研究持续性炎症如何影响vlPAG中的CB1R功能和脱敏.
- 探索内分泌素合成和降解在调节炎症期间CB1R活性中的作用.
- 评估这些适应对开发向大麻素疼痛疗法的影响.
主要方法:
- 在幼稚和炎症大鼠的大脑切片中的电生理学记录 (微型和唤起的抑制后突触电流).
- 使用大麻素激动剂,GRK2/3抑制剂 (化合物101) 和单糖醇脂酶 (MAGL) 抑制剂 (JZL184) 的药理学操纵.
- 使用完整的弗洛恩德辅助剂 (CFA) 注射诱导持久性炎症.
主要成果:
- 持续的炎症导致CB1Rs显著脱敏,降低了外源性大麻素激动剂的疗效.
- 这种无敏化是由GRK2/3调解的,因为它是由化合物101.1逆转的.
- 尽管减少了外源激动剂效应,但内分泌类药物表现出长时间的CB1R激活,这表明合成的增加以及MAGL在降解2-阿拉基多诺伊尔糖醇 (2-AG) 维护受体功能的过程中发挥的关键作用.
结论:
- 持续的炎症会启动CB1Rs去敏感,从而影响外源性大麻素在缓解疼痛方面的疗效.
- 通过MAGL介导的2-AG降解对于防止过度的CB1R无敏化和在炎症期间维持内分泌卡纳比诺伊德信号传递至关重要.
- 这些发现凸显了炎症期间内大麻素系统的复杂适应,并建议针对MAGL和CB1R改善疼痛治疗方法.
相关概念视频
GPCR Desensitization
6.2K
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
6.2K
Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.3K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
2.3K
GPCRs Regulate Adenylyl Cylase Activity
5.7K
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
5.7K
IP3/DAG Signaling Pathway
12.2K
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
12.2K
Desensitization and Tachyphylaxis
1.9K
Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
1.9K
Receptor-mediated Endocytosis
104.7K
Overview
104.7K


