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A-激酶锚定蛋白 79/150 协调感觉神经元中 α-氨基-3-羟基-5-甲基-4-异恶唑丙酸受体的敏化作用。

A-kinase anchoring protein 79/150 coordinates α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor sensitization in sensory neurons.

机构信息

Department of Oral and Maxillofacial Surgery, University of Texas Health San Antonio, San Antonio, TX, USA.

Department of Pharmacology, University of Texas Health San Antonio, San Antonio, TX, USA.

出版信息

Mol Pain. 2023 Jan-Dec;19:17448069231222406. doi: 10.1177/17448069231222406.

Abstract

Changes in sensory afferent activity contribute to the transition from acute to chronic pain. However, it is unlikely that a single sensory receptor is entirely responsible for persistent pain. It is more probable that extended changes to multiple receptor proteins expressed by afferent neurons support persistent pain. A-Kinase Anchoring Protein 79/150 (AKAP) is an intracellular scaffolding protein expressed in sensory neurons that spatially and temporally coordinates signaling events. Since AKAP scaffolds biochemical modifications of multiple TRP receptors linked to pain phenotypes, we probed for other ionotropic receptors that may be mediated by AKAP and contribute to persistent pain. Here, we identify a role for AKAP modulation of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid Receptor (AMPA-R) functionality in sensory neurons. Pharmacological manipulation of distinct AMPA-R subunits significantly reduces persistent mechanical hypersensitivity observed during hyperalgesic priming. Stimulation of both protein kinases C and A (PKC, PKA, respectively) modulate AMPA-R subunit GluR1 and GluR2 phosphorylation and surface expression in an AKAP-dependent manner in primary cultures of DRG neurons. Furthermore, AKAP knock out reduces sensitized AMPA-R responsivity in DRG neurons. Collectively, these data indicate that AKAP scaffolds AMPA-R subunit organization in DRG neurons that may contribute to the transition from acute-to-chronic pain.

摘要

感觉传入活动的变化导致急性疼痛向慢性疼痛的转变。然而,不太可能有一种单一的感觉受体完全负责持续性疼痛。更有可能的是,传入神经元表达的多种受体蛋白的广泛变化支持持续性疼痛。A-激酶锚定蛋白 79/150(AKAP)是一种在感觉神经元中表达的细胞内支架蛋白,它在时空上协调信号事件。由于 AKAP 支架多种与疼痛表型相关的 TRP 受体的生化修饰,我们探测了其他可能由 AKAP 介导并有助于持续性疼痛的离子型受体。在这里,我们确定 AKAP 对感觉神经元中 α-氨基-3-羟基-5-甲基-4-异恶唑丙酸受体(AMPA-R)功能的调节作用。对不同 AMPA-R 亚基的药理学操作显著降低了在痛觉敏化引发期间观察到的持续性机械性超敏反应。蛋白激酶 C 和 A(PKC、PKA)的刺激分别以 AKAP 依赖的方式调节初级培养的 DRG 神经元中 AMPA-R 亚基 GluR1 和 GluR2 的磷酸化和表面表达。此外,AKAP 敲除减少了 DRG 神经元中致敏 AMPA-R 的反应性。总之,这些数据表明,AKAP 支架 DRG 神经元中的 AMPA-R 亚基组织,这可能有助于从急性到慢性疼痛的转变。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/becf/10722943/6d6ab03a422d/10.1177_17448069231222406-fig1.jpg

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