Abstract：
:We examined the involvement of tumor necrosis factor (TNF)-alpha on glutamate-induced cytotoxicity in a differentiated neuronal cell line. In this study, we used nerve growth factor (NGF)-differentiated PC12h cells. Glutamate cytotoxicity was assessed using the MTS and TUNEL assays. To detect TNF-alpha levels in culture supernatants after glutamate exposure, we used ELISA methods. The involvement of caspase-8, which is downstream from TNF receptor 1 (TNF-R1) in glutamate-induced cytotoxicity, was determined by Western blot analysis. The MTS assay showed that the addition of glutamate resulted in dose-dependent cell death, while the TUNEL assay showed that glutamate induced apoptosis in differentiated PC12h cells in a dose-dependent manner. TNF-alpha levels in the supernatant of glutamate-exposed cells were significantly increased compared with those in unexposed cells. In addition, glutamate caused increases in the levels of caspase-8 protein. The increases in caspase-8 levels were ameliorated by pretreatment with soluble TNF-R1. Moreover, soluble TNF-R1 significantly ameliorated the cell death induced by glutamate. These results suggest that TNF-alpha released from neuronal cells may be associated with glutamate-induced neuronal cell death.
journal_name
Brain Resjournal_title
Brain researchauthors
Kogo J,Takeba Y,Kumai T,Kitaoka Y,Matsumoto N,Ueno S,Kobayashi Sdoi
10.1016/j.brainres.2006.09.006subject
Has Abstractpub_date
2006-11-29 00:00:00pages
201-8issue
1eissn
0006-8993issn
1872-6240pii
S0006-8993(06)02672-2journal_volume
1122pub_type
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