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首页> 外文期刊>Neuron >A critical role for myosin IIb in dendritic spine morphology and synaptic function.
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A critical role for myosin IIb in dendritic spine morphology and synaptic function.

机译:肌球蛋白IIb在树突棘形态和突触功能中的关键作用。

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摘要

Dendritic spines show rapid motility and plastic morphology, which may mediate information storage in the brain. It is presently believed that polymerization/depolymerization of actin is the primary determinant of spine motility and morphogenesis. Here, we show that myosin IIB, a molecular motor that binds and contracts actin filaments, is essential for normal spine morphology and dynamics and represents a distinct biophysical pathway to control spine size and shape. Myosin IIB is enriched in the postsynaptic density (PSD) of neurons. Pharmacologic or genetic inhibition of myosin IIB alters protrusive motility of spines, destabilizes their classical mushroom-head morphology, and impairs excitatory synaptic transmission. Thus, the structure and function of spines is regulated by an actin-based motor in addition to the polymerization state of actin.
机译:树突棘显示出快速运动和可塑性形态,可介导大脑中的信息存储。目前认为肌动蛋白的聚合/解聚是脊柱运动性和形态发生的主要决定因素。在这里,我们表明,肌球蛋白IIB是一种结合并收缩肌动蛋白丝的分子运动,对于正常的脊柱形态和动力学至关重要,并且代表了一种独特的生物物理途径来控制脊柱的大小和形状。肌球蛋白IIB富含神经元的突触后密度(PSD)。肌球蛋白IIB的药理或遗传抑制作用会改变棘突的活动性,破坏其经典蘑菇头形态的稳定性,并削弱兴奋性突触传递。因此,除了肌动蛋白的聚合状态以外,还通过基于肌动蛋白的马达来调节棘的结构和功能。

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