首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Notch signaling in vascular smooth muscle cells is required to pattern the cerebral vasculature
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Notch signaling in vascular smooth muscle cells is required to pattern the cerebral vasculature

机译:需要血管平滑肌细胞中的Notch信号来构图脑血管

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摘要

Stroke is the third leading cause of death and a significant contributor of morbidity in the United States. In humans, suboptimal cerebral collateral circulation within the circle of Willis (CW) predisposes to ischemia and stroke risk in the setting of occlusive carotid artery disease. Unique genes or developmental pathways responsible for proper CW formation are unknown. Herein we characterize a mouse model lacking Notch signaling in vascular smooth muscle cells (vSMCs), in which the animals are intolerant to reduced cerebral blood flow. Remarkably, unilateral carotid artery ligation results in profound neurological sequelae and death. After carotid ligation, perfusion of the ipsilateral cerebral hemisphere was markedly diminished, suggesting an anastomotic deficiency within the CW. High-resolution microcomputed tomographic (μ-CT) imaging revealed profound defects in cerebrovascular patterning, including interruption of the CW and anatomic deformity of the cerebral arteries. These data identify a vSMC-autonomous function for Notch signaling in patterning and collateral formation within the cerebral arterial circulation. The data further implicate genetic or functional deficiencies in Notch signaling in the patho-genesis of anatomic derangements underlying cerebrovascular accidents.
机译:在美国,中风是第三大死亡原因,也是发病率的重要原因。在人类中,威利斯(CW)圈内的次要大脑副循环不足,易导致闭塞性颈动脉疾病。负责适当CW形成的独特基因或发育途径尚不清楚。本文中,我们表征了在血管平滑肌细胞(vSMCs)中缺乏Notch信号传导的小鼠模型,其中的动物无法耐受脑血流量的减少。值得注意的是,单侧颈动脉结扎会导致严重的神经后遗症和死亡。颈动脉结扎后,同侧大脑半球的灌注明显减少,表明CW内存在吻合口不足。高分辨率微计算机断层扫描(μ-CT)成像显示脑血管模式存在严重缺陷,包括CW中断和脑动脉解剖畸形。这些数据确定了vSMC自主功能,用于在脑动脉循环内的模式和侧支形成中进行Notch信号传导。数据进一步暗示了Notch信号转导在脑血管意外所致解剖异常的发病机理中的遗传或功能缺陷。

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