Abstract:
:Semaphorins provide crucial attractive and repulsive cues involved in axon guidance during neural development. Out of them, Semaphorin 4D (Sema4D) is enriched in the nervous and immune tissues, and acts as proliferative and survival factors of peripheral lymphocytes in the immune system, but is poorly understood in the nervous system. By using PC12 cells which are well known to differentiate into neural cells in response to nerve growth factor (NGF), we found that soluble forms of Sema4D had neurotrophic effects which were inhibited by neutralizing antibodies to Sema4D. Sema4D strikingly potentiated neurite outgrowth in the presence of 50 ng/ml NGF and increased sensitivity to NGF. Cells responded to very low concentrations of NGF in the presence of 1 nM Sema4D. Activation of following signal proteins, protein kinase C (PKC), L-type of voltage-dependent Ca(2+) channel, and phosphatidylinositol (PI) 3-kinase mediated neurotrophic neurite-outgrowth action of Sema4D. These findings suggest a new function of Sema4D as a neurotrophic signal in PC12 cells.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Fujioka S,Masuda K,Toguchi M,Ohoka Y,Sakai T,Furuyama T,Inagaki Sdoi
10.1016/s0006-291x(02)03023-1subject
Has Abstractpub_date
2003-02-07 00:00:00pages
304-10issue
2eissn
0006-291Xissn
1090-2104pii
S0006291X02030231journal_volume
301pub_type
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