The ER stress factor XBP1s prevents amyloid-β neurotoxicity
| Autor: | Diego E. Rincon-Limas, Pedro Fernandez-Funez, Yan Zhang, Melisa Gomez-Velazquez, Jonatan Sanchez-Garcia, Sergio Casas-Tintó |
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| Rok vydání: | 2011 |
| Předmět: |
Male
Protein Folding XBP1 Amyloid RNA Splicing Biology Endoplasmic Reticulum Eye Transfection PC12 Cells Neuroprotection Animals Genetically Modified Downregulation and upregulation Alzheimer Disease Genetics medicine Animals Drosophila Proteins RNA Small Interfering Molecular Biology Genetics (clinical) Neurons Amyloid beta-Peptides Ryanodine receptor Endoplasmic reticulum Neurotoxicity Ryanodine Receptor Calcium Release Channel Articles General Medicine medicine.disease Molecular biology Peptide Fragments Rats Cell biology DNA-Binding Proteins Unfolded protein response Calcium Drosophila Female |
| Zdroj: | Human Molecular Genetics. 20:2144-2160 |
| ISSN: | 1460-2083 0964-6906 |
| DOI: | 10.1093/hmg/ddr100 |
| Popis: | Alzheimer's disease (AD) is an incurable neurodegenerative disorder clinically characterized by progressive cognitive impairment. A prominent pathologic hallmark in the AD brain is the abnormal accumulation of the amyloid-β 1-42 peptide (Aβ), but the exact pathways mediating Aβ neurotoxicity remain enigmatic. Endoplasmic reticulum (ER) stress is induced during AD, and has been indirectly implicated as a mediator of Aβ neurotoxicity. We report here that Aβ activates the ER stress response factor X-box binding protein 1 (XBP1) in transgenic flies and in mammalian cultured neurons, yielding its active form, the transcription factor XBP1s. XBP1s shows neuroprotective activity in two different AD models, flies expressing Aβ and mammalian cultured neurons treated with Aβ oligomers. Trying to identify the mechanisms mediating XBP1s neuroprotection, we found that in PC12 cells treated with Aβ oligomers, XBP1s prevents the accumulation of free calcium (Ca(2+)) in the cytosol. This protective activity can be mediated by the downregulation of a specific isoform of the ryanodine Ca(2+) channel, RyR3. In support of this observation, a mutation in the only ryanodine receptor (RyR) in flies also suppresses Aβ neurotoxicity, indicating the conserved mechanisms between the two AD models. These results underscore the functional relevance of XBP1s in Aβ toxicity, and uncover the potential of XBP1 and RyR as targets for AD therapeutics. |
| Databáze: | OpenAIRE |
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