Y. Goodman et Mp. Mattson, CERAMIDE PROTECTS HIPPOCAMPAL-NEURONS AGAINST EXCITOTOXIC AND OXIDATIVE INSULTS, AND AMYLOID BETA-PEPTIDE TOXICITY, Journal of neurochemistry, 66(2), 1996, pp. 869-872
The transcription factor NF kappa B is activated by various signals as
sociated with brain injury, including tumor necrosis factor (TNF), oxi
dative insults, and amyloid beta-peptide (A beta). We recently reporte
d that TNFs activate NF kappa B in neurons and protect them against ex
citotoxic and oxidative insults, including A beta toxicity. We now rep
ort that C2-ceramide (C2), a membrane-permeant activator of NF kappa B
, protects cultured rat hippocampal neurons against death induced by g
lutamate, FeSO4, and A beta. Protection was concentration dependent, s
pecific (a ceramide analogue known not to activate NF kappa B was inef
fective), required pretreatment, and was blocked by inhibitors of RNA
and protein synthesis. Lipid peroxidation and accumulation of cellular
peroxides induced by glutamate, FeSO4, and A beta were significantly
attenuated in neurons pretreated with C2. The data indicate that C2 in
duces antioxidant pathways in neurons and suggest novel approaches for
reducing neuronal injury in both acute and chronic neurodegenerative
conditions.