对为期 5 周卧床休息研究的肌肉活检进行 RNA 测序,揭示了运动的影响及其与背根神经节神经元的潜在相互作用。

RNA sequencing on muscle biopsy from a 5-week bed rest study reveals the effect of exercise and potential interactions with dorsal root ganglion neurons.

机构信息

School of Behavioral and Brain Sciences and Center for Advanced Pain Studies, University of Texas at Dallas, Dallas, Texas, USA.

Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital Dallas, Dallas, Texas, USA.

出版信息

Physiol Rep. 2022 Feb;10(3):e15176. doi: 10.14814/phy2.15176.

Abstract

Sedentary lifestyle, chronic disease, or microgravity can cause muscle deconditioning that then has an impact on other physiological systems. An example is the nervous system, which is adversely affected by decreased physical activity resulting in increased incidence of neurological problems such as chronic pain. We sought to better understand how this might occur by conducting RNA sequencing experiments on muscle biopsies from human volunteers in a 5-week bed-rest study with an exercise intervention arm. We also used a computational method for examining ligand-receptor interactions between muscle and human dorsal root ganglion (DRG) neurons, the latter of which play a key role in nociception and are generators of signals responsible for chronic pain. We identified 1352 differentially expressed genes (DEGs) in bed rest subjects without an exercise intervention but only 132 DEGs in subjects with the intervention. Among 591 upregulated muscle genes in the no intervention arm, 26 of these were ligands that have receptors that are expressed by human DRG neurons. We detected a specific splice variant of one of these ligands, placental growth factor (PGF), in deconditioned muscle that binds to neuropilin 1, a receptor that is highly expressed in DRG neurons and known to promote neuropathic pain. We conclude that exercise intervention protects muscle from deconditioning transcriptomic changes, and prevents changes in the expression of ligands that might sensitize DRG neurons, or act on other cell types throughout the body. Our work creates a set of actionable hypotheses to better understand how deconditioned muscle may influence the function of sensory neurons that innervate the entire body.

摘要

久坐的生活方式、慢性病或微重力会导致肌肉失健,进而对其他生理系统产生影响。例如神经系统,由于身体活动减少,会受到负面影响,从而导致神经问题(如慢性疼痛)的发生率增加。我们通过对进行了为期 5 周卧床休息研究的人类志愿者的肌肉活检进行 RNA 测序实验,寻求更好地了解这种情况发生的原因,该研究中有一个运动干预组。我们还使用了一种计算方法来研究肌肉和人类背根神经节 (DRG) 神经元之间的配体-受体相互作用,后者在伤害感受中起着关键作用,是负责慢性疼痛的信号的产生器。我们在没有运动干预的卧床休息受试者中鉴定出 1352 个差异表达基因 (DEG),但在有干预的受试者中只有 132 个 DEG。在无干预组中上调的 591 个肌肉基因中,其中 26 个是配体,它们的受体由人类 DRG 神经元表达。我们在失健肌肉中检测到其中一种配体胎盘生长因子 (PGF) 的特定剪接变体,该配体与神经纤毛蛋白 1 结合,神经纤毛蛋白 1 是一种在 DRG 神经元中高度表达的受体,已知可促进神经病理性疼痛。我们得出结论,运动干预可保护肌肉免受失健转录组变化的影响,并防止配体表达的变化,这些变化可能会使 DRG 神经元敏感化,或作用于全身其他细胞类型。我们的工作提出了一系列可操作的假设,以更好地了解失健肌肉如何影响支配全身的感觉神经元的功能。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4196/8823189/2ef38d491294/PHY2-10-e15176-g002.jpg

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