N-cadherin prodomain cleavage regulates synapse formation in vivo.

N-cadherin prodomain cleavage regulates synapse formation in vivo.
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DOI:
10.1002/dneu.20718
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发表时间:
2009-07
影响因子:
3
通讯作者:
Ruthazer, Edward S.
Ruthazer, Edward S.
中科院分区:
医学3区
文献类型:
--
作者:
Latefi, Nazlie S.;Pedraza, Lifiana;Schohl, Anne;Li, Ziwei;Ruthazer, Edward S.

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Cadherins are initially synthesized bearing a prodomain that is thought to limit adhesion during early stages of biosynthesis. Functional cadherins lack this prodomain, raising the intriguing possibility that cells may utilize prodomain cleavage as a means to temporally or spatially regulate adhesion after delivery of cadherin to the cell surface. In support of this idea, immunostaining for the prodomain of zebrafish N-cadherin revealed enriched labeling at neuronal surfaces at the soma and along axonal processes. To determine whether post-translational cleavage of the prodomain affects synapse formation, we imaged Rohon-Beard cells in zebrafish embryos expressing GFP-tagged wild-type N-cadherin (NCAD-GFP) or a GFP-tagged N-cadherin mutant expressing an uncleavable prodomain (PRON-GFP) rendering it non-adhesive. NCAD-GFP accumulated at synaptic microdomains in a developmentally regulated manner, and its overexpression transiently accelerated synapse formation. PRON-GFP was much more diffusely distributed along the axon and its overexpression delayed synapse formation. Our results support the notion that N-cadherin serves to stabilize pre- to postsynaptic contacts early in synapse development and suggests that regulated cleavage of the N-cadherin prodomain may be a mechanism by which the kinetics of synaptogenesis are regulated.
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