Tang X, Jang SW, Okada M, Chan CB, Feng Y, Liu Y, Luo SW, Hong Y, Rama N, Xiong WC, Mehlen P, Ye K. Netrin-1 mediates neuronal survival through PIKE-L interaction with the dependence receptor UNC5B.
Nat Cell Biol 2008;
10:698-706. [PMID:
18469807 DOI:
10.1038/ncb1732]
[Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2008] [Accepted: 02/29/2008] [Indexed: 12/11/2022]
Abstract
Netrins, a family of secreted molecules, have critical functions in axon guidance and cell migration during neuronal development. In addition to its role as a chemotropic molecule, netrin-1 also acts as a survival factor. Both UNC5 (that is, UNC5A, UNC5B, UNC5C or UNC5D) and DCC are transmembrane receptors for netrin-1 (Refs 8, 9). In the absence of netrin-1, DCC and UNC5 act as dependence receptors and trigger apoptosis. However, how netrin-1 suppresses the apoptotic activity of the receptors remains elusive. Here we show that netrin-1 induces interaction of UNC5B with the brain-specific GTPase PIKE-L. This interaction triggers the activation of PtdIns-3-OH kinase signalling, prevents UNC5B's pro-apoptotic activity and enhances neuronal survival. Moreover, this process relies strongly on Fyn because PIKE-L is tyrosine phosphorylated in response to netrin-1, and the netrin-1-mediated interaction of UNC5B with PIKE-L is inhibited in Fyn-null mice. Thus, PIKE-L acts as a downstream survival effector for netrin-1 through UNC5B in the nervous system.
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