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首页> 外文期刊>Neuron >EphB2 guides axons at the midline and is necessary for normal vestibular function (see comments)
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EphB2 guides axons at the midline and is necessary for normal vestibular function (see comments)

机译:EphB2在中线引导轴突,对于正常的前庭功能是必不可少的(请参阅注释)

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摘要

Mice lacking the EphB2 receptor tyrosine kinase display a cell-autonomous, strain-specific circling behavior that is associated with vestibular phenotypes. In mutant embryos, the contralateral inner ear efferent growth cones exhibit inappropriate pathway selection at the midline, while in mutant adults, the endolymph-filled lumen of the semicircular canals is severely reduced. EphB2 is expressed in the endolymph-producing dark cells in the inner ear epithelium, and these cells show ultrastructural defects in the mutants. A molecular link to fluid regulation is provided by demonstrating that PDZ domain-containing proteins that bind the C termini of EphB2 and B-ephrins can also recognize the cytoplasmic tails of anion exchangers and aquaporins. This suggests EphB2 may regulate ionic homeostasis and endolymph fluid production through macromolecular associations with membrane channels that transport chloride, bicarbonate, and water.
机译:缺乏EphB2受体酪氨酸激酶的小鼠表现出与前庭表型有关的细胞自主的,应变特异性的循环行为。在突变的胚胎中,对侧内耳传出的生长锥在中线显示出不合适的途径选择,而在突变的成年人中,半圆形管的内淋巴充满腔明显减少。 EphB2在内耳上皮中产生内淋巴的暗细胞中表达,这些细胞在突变体中显示出超微结构缺陷。通过证明与EphB2和B-ephrins的C末端结合的含PDZ域的蛋白质还可以识别阴离子交换剂和水通道蛋白的细胞质尾部,从而提供了与流体调节的分子联系。这表明EphB2可能通过与传输氯化物,碳酸氢盐和水的膜通道的大分子缔合来调节离子稳态和内淋巴液的产生。

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