Abstract:
:Neurotrophic factors regulate neuronal survival and differentiation and control neurite outgrowth by binding to tyrosine kinase receptors, the Trks, and a tumor necrosis factor (TNF) receptor-like molecule, p75 neurotrophin receptor. A proinflammatory cytokine, TNF, also affects survival and apoptotic death in neuronal cells. However, it is still unclear whether neurotrophic factors and TNF co-operate the intracellular signaling. Using green fluorescent protein-tagged NF-kappaB1 (GFP-NF-kappaB1), we examined here the effects of TNF-alpha and neurotrophic factors on the nuclear translocation of NF-kappaB in PC12 cells. TNF-alpha induced gradually the translocation of GFP-NF-kappaB1 from the cytoplasm to the nucleus within 60 min. Pretreatment of lactacystin which is a proteasome-specific inhibitor suppressed significantly the nuclear translocation of GFP-NF-kappaB1 after TNF-alpha stimulation. In addition, we found that co-stimulation of TNF-alpha and neurotrophic factors such as nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF) increased greatly the nuclear translocation of GFP-NF-kappaB1 whereas neither NGF nor BDNF itself induced the translocation. These results suggested that there is a close correlation between the signaling pathways via TNF receptors and neurotrophin receptors for the NF-kappaB activation, and that NGF and BDNF enhance TNF-alpha-induced nuclear translocation of NF-kappaB.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Furuno T,Nakanishi Mdoi
10.1016/j.neulet.2005.09.031keywords:
subject
Has Abstractpub_date
2006-01-16 00:00:00pages
240-4issue
3eissn
0304-3940issn
1872-7972pii
S0304-3940(05)01091-8journal_volume
392pub_type
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