Deletion of Mea6 in Cerebellar Granule Cells Impairs Synaptic Development and Motor Performance.

Deletion of Mea6 in Cerebellar Granule Cells Impairs Synaptic Development and Motor Performance.
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小脑颗粒细胞中Mea6的缺失会损害突触发育和运动表现。

DOI:
10.3389/fcell.2020.627146
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发表时间:
2020
影响因子:
5.5
通讯作者:
Shen Y
Shen Y
中科院分区:
生物学2区
文献类型:
--
作者:
Wang XT;Zhou L;Cai XY;Xu FX;Xu ZH;Li XY;Shen Y

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小脑被概念化为复杂运动的处理器。许多具有基因靶向突变的疾病,包括与脑膜瘤表达抗原6(Mea6)功能缺失突变相关的Fahr病,表现为小脑畸形和运动行为异常。我们先前报道了Nestin-Cre;Mea6F/F小鼠的小脑发育和运动能力的缺陷比Purkinje细胞靶向的pCP2-Cre;Mea6F/F小鼠更严重,提示Mea6作用于其他类型的小脑细胞。因此,我们研究了Mea6在小脑颗粒细胞中的功能。我们发现,颗粒细胞中特定缺失Mea6的突变小鼠在足迹、头部倾斜、平衡木和转杆测试中显示出姿势、平衡和运动学习的异常。我们进一步表明,Math1-Cre;Mea6F/F小鼠表现出颗粒细胞前体迁移障碍和平行纤维-浦肯野细胞突触受损,这可能与囊泡谷氨酸转运体1和脑源性神经营养因子的细胞内运输受损有关。这一发现扩展了我们以前的工作,可能有助于更好地理解Fahr病的发病机制。
The cerebellum is conceptualized as a processor of complex movements. Many diseases with gene-targeted mutations, including Fahr’s disease associated with the loss-of-function mutation of meningioma expressed antigen 6 (Mea6), exhibit cerebellar malformations, and abnormal motor behaviors. We previously reported that the defects in cerebellar development and motor performance of Nestin-Cre;Mea6F/F mice are severer than those of Purkinje cell-targeted pCP2-Cre;Mea6F/F mice, suggesting that Mea6 acts on other types of cerebellar cells. Hence, we investigated the function of Mea6 in cerebellar granule cells. We found that mutant mice with the specific deletion of Mea6 in granule cells displayed abnormal posture, balance, and motor learning, as indicated in footprint, head inclination, balanced beam, and rotarod tests. We further showed that Math1-Cre;Mea6F/F mice exhibited disrupted migration of granule cell progenitors and damaged parallel fiber-Purkinje cell synapses, which may be related to impaired intracellular transport of vesicular glutamate transporter 1 and brain-derived neurotrophic factor. The present findings extend our previous work and may help to better understand the pathogenesis of Fahr’s disease.
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