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血管内皮生长因子对动眼系统运动神经元的神经保护作用。

Neuroprotective Effect of Vascular Endothelial Growth Factor on Motoneurons of the Oculomotor System.

机构信息

Departamento de Fisiología, Facultad de Biología, Universidad de Sevilla, 41012 Sevilla, Spain.

出版信息

Int J Mol Sci. 2021 Jan 15;22(2):814. doi: 10.3390/ijms22020814.

Abstract

Vascular endothelial growth factor (VEGF) was initially characterized as a potent angiogenic factor based on its activity on the vascular system. However, it is now well established that VEGF also plays a crucial role as a neuroprotective factor in the nervous system. A deficit of VEGF has been related to motoneuronal degeneration, such as that occurring in amyotrophic lateral sclerosis (ALS). Strikingly, motoneurons of the oculomotor system show lesser vulnerability to neurodegeneration in ALS compared to other motoneurons. These motoneurons presented higher amounts of VEGF and its receptor Flk-1 than other brainstem pools. That higher VEGF level could be due to an enhanced retrograde input from their target muscles, but it can also be produced by the motoneurons themselves and act in an autocrine way. By contrast, VEGF's paracrine supply from the vicinity cells, such as glial cells, seems to represent a minor source of VEGF for brainstem motoneurons. In addition, ocular motoneurons experiment an increase in VEGF and Flk-1 level in response to axotomy, not observed in facial or hypoglossal motoneurons. Therefore, in this review, we summarize the differences in VEGF availability that could contribute to the higher resistance of extraocular motoneurons to injury and neurodegenerative diseases.

摘要

血管内皮生长因子 (VEGF) 最初被描述为一种强有力的血管生成因子,基于其对血管系统的活性。然而,现在已经明确的是,VEGF 作为一种神经保护因子在神经系统中也起着至关重要的作用。VEGF 的缺乏与运动神经元变性有关,如肌萎缩侧索硬化症 (ALS) 中发生的变性。引人注目的是,与其他运动神经元相比,动眼神经系统的运动神经元在 ALS 中较少受到神经退行性变的影响。这些运动神经元表现出比其他脑桥池更高水平的 VEGF 和其受体 Flk-1。更高的 VEGF 水平可能是由于来自目标肌肉的逆行输入增强,但也可能是由运动神经元自身产生并以自分泌方式发挥作用。相比之下,来自附近细胞(如神经胶质细胞)的 VEGF 的旁分泌供应似乎代表了脑桥运动神经元 VEGF 的次要来源。此外,眼动神经元在轴突切断后经历 VEGF 和 Flk-1 水平的增加,而在面神经元或舌下神经元中未观察到这种增加。因此,在这篇综述中,我们总结了 VEGF 可用性的差异,这些差异可能有助于解释眼外运动神经元对损伤和神经退行性疾病更高的抗性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ca65/7830098/c7910653881e/ijms-22-00814-g001.jpg

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