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Bai, Bing; Hales, Chadwick M.; Chen, Ping-Chung; Gozal, Yair; Dammer, Eric B.; Fritz, Jason J.; Wang, Xusheng; Xia, Qiangwei; Duong, Duc M.; Street, Craig; Cantero, Gloria; Cheng, Dongmei; Jones, Drew R.; Wu, Zhiping; Li, Yuxin; Diner, Ian; Heilman, Craig J.; Rees, Howard D.; Wu, Hao; Li Lin; Szulwach, Keith E.; Gearing, Marla; Mufson, Elliott J.; Bennett, David A.; Montin, Thomas J.; Seyfried, Nicholas T.; Wingo, Thomas S.; Yi E. Sun; Jin, Peng; Hanfelt, John; Willcock, Donna M.; Levey, Allan; Lah, James J.; Peng, Junmin
Proceedings of the National Academy of Sciences - PNAS, 10/2013, Letnik: 110, Številka: 41Journal Article
Deposition of insoluble protein aggregates is a hallmark of neurodegenerative diseases. The universal presence of β-amyloid and tau in Alzheimer’s disease (AD) has facilitated advancement of the amyloid cascade and tau hypotheses that have dominated AD pathogenesis research and therapeutic development. However, the underlying etiology of the disease remains to be fully elucidated. Here we report a comprehensive study of the human brain-insoluble proteome in AD by mass spectrometry. We identify 4,216 proteins, among which 36 proteins accumulate in the disease, including U1-70K and other U1 small nuclear ribonucleoprotein (U1 snRNP) spliceosome components. Similar accumulations in mild cognitive impairment cases indicate that spliceosome changes occur in early stages of AD. Multiple U1 snRNP subunits form cytoplasmic tangle-like structures in AD but not in other examined neurodegenerative disorders, including Parkinson disease and frontotemporal lobar degeneration. Comparison of RNA from AD and control brains reveals dysregulated RNA processing with accumulation of unspliced RNA species in AD, including myc box-dependent-interacting protein 1, clusterin, and presenilin-1 . U1-70K knockdown or antisense oligonucleotide inhibition of U1 snRNP increases the protein level of amyloid precursor protein. Thus, our results demonstrate unique U1 snRNP pathology and implicate abnormal RNA splicing in AD pathogenesis.
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in: SICRIS
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