Molecular Regulations Induced by Acrolein in Neuroblastoma SK-N-SH Cells: Relevance to Alzheimer's Disease.
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Molecular Regulations Induced by Acrolein in Neuroblastoma SK-N-SH Cells: Relevance to Alzheimer's Disease.

J Alzheimers Dis. 2010 Aug 6;

Authors: Thanh Nam D, Arseneault M, Zarkovic N, Waeg G, Ramassamy C

Acrolein is the most reactive aldehyde among the by-products of lipid peroxidation. Growing evidence indicates that acrolein may play an important role in the pathogenesis of Alzheimer's disease (AD). In AD, levels of acrolein are significantly higher in hippocampus and temporal cortex regions of the brain. However, little is known about its toxicity in neuronal cells. Using the neuroblastoma cell line SK-N-SH, our results show that acrolein is toxic from 10 muM, but its toxicity does not induce the activation of caspase-3 and DNA fragmentation. Protein carbonylation and 4-hydroxy-nonenal levels were increased after 0.5 h and 1 h of treatment, respectively. Furthermore acrolein induced a biphasic effect on glutathione levels with a rapid depletion followed by a progressive increase. We have further investigated the regulation of different redox signaling pathways. A treatment with 10 muM of acrolein for 30 min activated NFkappaB while this activation was suppressed after a 24 h of treatment. In contrast, Nrf2 was activated only after 24 h of acrolein exposure. Consequently, the expression of heme oxygenase-1 and gamma-glutamyl-cysteine-synthase were elevated after 24 h of acrolein treatment. Sirt-1 was also upregulated after 24 h of acrolein treatment. The p66Shc and ERK1/2 proteins are known to be involved in oxidative stress. Acrolein, at 10 muM, induced the phosphorylation of p66Shc and ERK1/2 only after a short period of treatment. Collectively, these data strengthen the contribution of acrolein in the induction of oxidative stress as observed in mild cognitive impairment and in AD brain.

PMID: 20693635 [PubMed - as supplied by publisher]

Read the complete post at http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?tmpl=NoSidebarfile&db=PubMed&cmd=Retrieve&list_uids=20693635&dopt=Abstract

Posted 11 Aug 2010 8:23 AM by pubmed: neuroblastoma
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