Functionally distinct PI 3-kinase pathways regulate myelination in the peripheral nervous system.
Functionally distinct PI 3-kinase pathways regulate myelination in the peripheral nervous system.
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DOI:
10.1083/jcb.201307057
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发表时间:
2014-03-31
期刊:
影响因子:
--
通讯作者:
Salzer JL
中科院分区:
文献类型:
--
作者:
Heller BA;Ghidinelli M;Voelkl J;Einheber S;Smith R;Grund E;Morahan G;Chandler D;Kalaydjieva L;Giancotti F;King RH;Fejes-Toth AN;Fejes-Toth G;Feltri ML;Lang F;Salzer JL
Functionally and spatially distinct PI 3-K pathways act either early to promote myelination downstream of axonal Neuregulin1 or late to inhibit myelination downstream of α6β4 integrin and Sgk1. The PI 3-kinase (PI 3-K) signaling pathway is essential for Schwann cell myelination. Here we have characterized PI 3-K effectors activated during myelination by probing myelinating cultures and developing nerves with an antibody that recognizes phosphorylated substrates for this pathway. We identified a discrete number of phospho-proteins including the S6 ribosomal protein (S6rp), which is down-regulated at the onset of myelination, and N-myc downstream-regulated gene-1 (NDRG1), which is up-regulated strikingly with myelination. We show that type III Neuregulin1 on the axon is the primary activator of S6rp, an effector of mTORC1. In contrast, laminin-2 in the extracellular matrix (ECM), signaling through the α6β4 integrin and Sgk1 (serum and glucocorticoid-induced kinase 1), drives phosphorylation of NDRG1 in the Cajal bands of the abaxonal compartment. Unexpectedly, mice deficient in α6β4 integrin signaling or Sgk1 exhibit hypermyelination during development. These results identify functionally and spatially distinct PI 3-K pathways: an early, pro-myelinating pathway driven by axonal Neuregulin1 and a later-acting, laminin–integrin-dependent pathway that negatively regulates myelination.
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DOI:
10.1083/jcb.122.4.809
发表时间:
1993-08
期刊:
The Journal of cell biology
影响因子:
--
作者:
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通讯作者:
Campbell KP
影响因子:
16.2
作者:
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通讯作者:
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影响因子:
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通讯作者:
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10.1083/jcb.200109021
发表时间:
2002-01-07
期刊:
The Journal of cell biology
影响因子:
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作者:
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通讯作者:
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DOI:
10.1083/jcb.109.1.273
发表时间:
1989-07
期刊:
The Journal of cell biology
影响因子:
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作者:
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通讯作者:
Bates M