Interneurite affinity is regulated by heterophilic nectin interactions in concert with the cadherin machinery.

Interneurite affinity is regulated by heterophilic nectin interactions in concert with the cadherin machinery.
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DOI:
10.1083/jcb.200601089
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发表时间:
2006-07-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Takeichi M
Takeichi M
中科院分区:
其他
文献类型:
--
作者:
Togashi H;Miyoshi J;Honda T;Sakisaka T;Takai Y;Takeichi M

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神经突在神经元间连接的形成过程中识别它们的特定伙伴。在海马锥体神经元中,轴突附着在树突上进行突触发生,但树突之间并不形成稳定的接触,这表明存在一种允许它们选择性关联的机制。Nectin-1(N1),一种免疫球蛋白结构域粘附蛋白,优先定位于轴突中,其嗜异性伴侣N3,存在于轴突和树突中;我们测试了它们在神经突间识别中的潜在作用。N1的过度表达,导致其错误定位到树突,诱导非典型的树突以及过度的axodendritic协会。相反,N1基因的缺失使轴突和树突棘之间的接触松动。连接蛋白的这些作用需要钙粘蛋白-连环蛋白的活性,但钙粘蛋白本身的过度表达不能加速轴突附着。这些结果表明,轴突偏向本地化的N1和它的反式相互作用与N3的合作与钙粘蛋白机械是至关重要的有序协会的轴突和树突。
Neurites recognize their specific partners during the formation of interneuronal connections. In hippocampal pyramidal neurons, axons attach to dendrites for their synaptogenesis, but the dendrites do not form stable contacts with each other, suggesting the presence of a mechanism to allow their selective associations. Nectin-1 (N1), an immunoglobulin domain adhesive protein, is preferentially localized in axons, and its heterophilic partner, N3, is present in both axons and dendrites; we tested their potential roles in interneurite recognition. The overexpression of N1, causing its mislocalization to dendrites, induced atypical dendrodendritic as well as excessive axodendritic associations. On the contrary, the genetic deletion of N1 loosened the contacts between axons and dendritic spines. Those actions of nectins required cadherin–catenin activities, but the overexpression of cadherin itself could not accelerate neurite attachment. These results suggest that the axon-biased localization of N1 and its trans-interaction with N3 in cooperation with the cadherin machinery is critical for the ordered association of axons and dendrites.
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