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原发性纤毛生长和轴突起始段 ADP-核糖基化因子样蛋白 13B 标记揭示渗透性脱髓鞘综合征(ODS)期间丘脑神经元的恢复能力。

Thalamic Neuron Resilience during Osmotic Demyelination Syndrome (ODS) Is Revealed by Primary Cilium Outgrowth and ADP-ribosylation factor-like protein 13B Labeling in Axon Initial Segment.

机构信息

URPhyM, NARILIS, Université de Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium.

Department of Anatomical Sciences, St George's University School of Medicine, Newcastle upon Tyne NE1 JG8, UK.

出版信息

Int J Mol Sci. 2023 Nov 17;24(22):16448. doi: 10.3390/ijms242216448.

Abstract

A murine osmotic demyelinating syndrome (ODS) model was developed through chronic hyponatremia, induced by desmopressin subcutaneous implants, followed by precipitous sodium restoration. The thalamic ventral posterolateral (VPL) and ventral posteromedial (VPM) relay nuclei were the most demyelinated regions where neuroglial damage could be evidenced without immune response. This report showed that following chronic hyponatremia, 12 h and 48 h time lapses after rebalancing osmolarity, amid the ODS-degraded outskirts, some resilient neuronal cell bodies built up primary cilium and axon hillock regions that extended into axon initial segments (AIS) where ADP-ribosylation factor-like protein 13B (ARL13B)-immunolabeled rod-like shape content was revealed. These AIS-labeled shaft lengths appeared proportional with the distance of neuronal cell bodies away from the ODS damaged epicenter and time lapses after correction of hyponatremia. Fine structure examination verified these neuron abundant transcriptions and translation regions marked by the ARL13B labeling associated with cell neurotubules and their complex cytoskeletal macromolecular architecture. This necessitated energetic transport to organize and restore those AIS away from the damaged ODS core demyelinated zone in the murine model. These labeled structures could substantiate how thalamic neuron resilience occurred as possible steps of a healing course out of ODS.

摘要

建立了一种通过慢性低钠血症诱导的啮齿动物渗透性脱髓鞘综合征(ODS)模型,这种模型是通过皮下植入去氨加压素来诱导,然后再进行快速的钠恢复。丘脑腹后外侧(VPL)和腹后内侧(VPM)中继核是脱髓鞘最严重的区域,在没有免疫反应的情况下可以证明神经胶质损伤。本报告显示,在慢性低钠血症后,在恢复渗透压后 12 小时和 48 小时的时间间隔内,在 ODS 降解的外围,一些有弹性的神经元胞体形成了初级纤毛和轴丘区域,这些区域延伸到轴突起始段(AIS),在那里可以发现 ADP-核糖基化因子样蛋白 13B(ARL13B)免疫标记的杆状形状内容物。这些 AIS 标记的轴突长度似乎与神经元胞体距离 ODS 损伤中心的距离以及低钠血症纠正后的时间间隔成正比。精细结构检查证实了这些富含神经元的转录和翻译区域与 ARL13B 标记相关,与细胞神经微管及其复杂的细胞骨架大分子结构相关。这需要能量运输来组织和恢复那些远离脱髓鞘核心区的 AIS,在这个啮齿动物模型中。这些标记的结构可以证明丘脑神经元的弹性是如何发生的,作为 ODS 愈合过程中的可能步骤之一。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2b1b/10671465/4be68efe37e8/ijms-24-16448-g0A1.jpg

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