In situ structure of intestinal apical surface reveals nanobristles on microvilli.

In situ structure of intestinal apical surface reveals nanobristles on microvilli.
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肠顶端表面的原位结构揭示了微绒毛上的纳米刷毛

DOI:
10.1073/pnas.2122249119
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发表时间:
2022-06-14
影响因子:
11.1
通讯作者:
--
中科院分区:
综合性期刊1区
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我们研究微绒毛秀丽隐杆线虫幼虫和小鼠肠道组织相结合的高压冷冻,冷冻聚焦离子束铣削,冷冻电子断层扫描,和subtomography平均。我们发现,许多放射状纳米刚毛,简称纳米刚毛,从线虫和小鼠微绒毛的侧面突出。梭秀丽线虫的纳米臂长37.5nm。我们发现,纳米软骨的形成需要一个原钙粘蛋白家族蛋白,CDH-8,在C。优雅的cdh-8突变体中的纳米纤维的丢失减缓了动物的生长,并且异位地增加了Y形微绒毛的数量,如果微绒毛从其尖端分裂,则Y形微绒毛是假定的中间结构。我们的研究结果揭示了一个潜在的作用,纳米在分离微绒毛,并建议微绒毛分裂可能有助于产生新生的微绒毛均匀。
Significance We study microvilli of Caenorhabditis elegans larvae and mouse intestinal tissues by combining high-pressure freezing, cryo-focused ion-beam milling, cryo-electron tomography, and subtomogram averaging. We find that many radial nanometer bristles, referred to as nanobristles, project from the lateral surface of nematode and mouse microvilli. The C. elegans nanobristles are 37.5 nm long. We show that nanobristle formation requires a protocadherin family protein, CDH-8, in C. elegans. The loss of nanobristles in cdh-8 mutants slows down animal growth and ectopically increases the number of Y-shaped microvilli, the putative intermediate structures if microvilli split from their tips. Our results reveal a potential role of nanobristles in separating microvilli and suggest that microvilli division may help generate nascent microvilli with uniformity.
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