期刊
JOURNAL OF NEUROSCIENCE
卷 25, 期 22, 页码 5365-5375出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1125-05.2005
关键词
Alzheimer; apoptosis; degeneration; hippocampus; neurotoxicity; proteolysis; amyloid
资金
- NINDS NIH HHS [R01 NS039080, NS39080] Funding Source: Medline
Recently, we have shown that the microtubule-associated protein tau is essential for beta-amyloid (A beta)-induced neurotoxicity in hippocampal neurons. However, the mechanisms by which tau mediates A beta-induced neurite degeneration remain poorly understood. In the present study, we analyzed whether tau cleavage played a role in these events. Our results showed that pre-aggregated A beta induced the generation of a 17 kDa tau fragment in cultured hippocampal neurons. The generation of this fragment was preceded by the activation of calpain-1. Conversely, inhibitors of this protease, but not of caspases, completely prevented tau proteolysis leading to the generation of the 17 kDa fragment and significantly reduced A beta-induced neuronal death. Furthermore, the expression of this fragment in cultured hippocampal neurons induced the formation of numerous varicosity-bearing tortuous processes, as well as the complete degeneration of some of those neurite processes. These results suggest that A beta-induced neurotoxicity may be mediated, at least in part, through the calpain-mediated generation of a toxic 17 kDa tau fragment. Collectively, these results provide insight into a novel mechanism by which tau could mediate A beta-induced neurotoxicity.
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