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  • 1
    Publication Date: 2013-03-12
    Description: CLP1 was the first mammalian RNA kinase to be identified. However, determining its in vivo function has been elusive. Here we generated kinase-dead Clp1 (Clp1(K/K)) mice that show a progressive loss of spinal motor neurons associated with axonal degeneration in the peripheral nerves and denervation of neuromuscular junctions, resulting in impaired motor function, muscle weakness, paralysis and fatal respiratory failure. Transgenic rescue experiments show that CLP1 functions in motor neurons. Mechanistically, loss of CLP1 activity results in accumulation of a novel set of small RNA fragments, derived from aberrant processing of tyrosine pre-transfer RNA. These tRNA fragments sensitize cells to oxidative-stress-induced p53 (also known as TRP53) activation and p53-dependent cell death. Genetic inactivation of p53 rescues Clp1(K/K) mice from the motor neuron loss, muscle denervation and respiratory failure. Our experiments uncover a mechanistic link between tRNA processing, formation of a new RNA species and progressive loss of lower motor neurons regulated by p53.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3674495/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3674495/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hanada, Toshikatsu -- Weitzer, Stefan -- Mair, Barbara -- Bernreuther, Christian -- Wainger, Brian J -- Ichida, Justin -- Hanada, Reiko -- Orthofer, Michael -- Cronin, Shane J -- Komnenovic, Vukoslav -- Minis, Adi -- Sato, Fuminori -- Mimata, Hiromitsu -- Yoshimura, Akihiko -- Tamir, Ido -- Rainer, Johannes -- Kofler, Reinhard -- Yaron, Avraham -- Eggan, Kevin C -- Woolf, Clifford J -- Glatzel, Markus -- Herbst, Ruth -- Martinez, Javier -- Penninger, Josef M -- K99NS077435-01A1/NS/NINDS NIH HHS/ -- NS038253/NS/NINDS NIH HHS/ -- P 19223/Austrian Science Fund FWF/Austria -- P 21667/Austrian Science Fund FWF/Austria -- R00 NS077435/NS/NINDS NIH HHS/ -- R01 NS038253/NS/NINDS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2013 Mar 28;495(7442):474-80. doi: 10.1038/nature11923. Epub 2013 Mar 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉IMBA, Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Vienna 1030, Austria.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23474986" target="_blank"〉PubMed〈/a〉
    Keywords: Amyotrophic Lateral Sclerosis ; Animals ; Animals, Newborn ; Axons/metabolism/pathology ; Cell Death ; Diaphragm/innervation ; Embryo Loss ; Embryo, Mammalian/metabolism/pathology ; Exons/genetics ; Female ; Fibroblasts ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; Mice, Transgenic ; Motor Neurons/*metabolism/*pathology ; Muscular Atrophy, Spinal ; Neuromuscular Diseases/metabolism/pathology ; Oxidative Stress ; RNA Processing, Post-Transcriptional ; RNA, Transfer, Tyr/genetics/*metabolism ; Respiration ; Spinal Nerves/cytology ; Transcription Factors/deficiency/*metabolism ; Tumor Suppressor Protein p53/metabolism ; Tyrosine/genetics/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2014-10-14
    Description: Alzheimer's disease is the most common form of dementia, characterized by two pathological hallmarks: amyloid-beta plaques and neurofibrillary tangles. The amyloid hypothesis of Alzheimer's disease posits that the excessive accumulation of amyloid-beta peptide leads to neurofibrillary tangles composed of aggregated hyperphosphorylated tau. However, to date, no single disease model has serially linked these two pathological events using human neuronal cells. Mouse models with familial Alzheimer's disease (FAD) mutations exhibit amyloid-beta-induced synaptic and memory deficits but they do not fully recapitulate other key pathological events of Alzheimer's disease, including distinct neurofibrillary tangle pathology. Human neurons derived from Alzheimer's disease patients have shown elevated levels of toxic amyloid-beta species and phosphorylated tau but did not demonstrate amyloid-beta plaques or neurofibrillary tangles. Here we report that FAD mutations in beta-amyloid precursor protein and presenilin 1 are able to induce robust extracellular deposition of amyloid-beta, including amyloid-beta plaques, in a human neural stem-cell-derived three-dimensional (3D) culture system. More importantly, the 3D-differentiated neuronal cells expressing FAD mutations exhibited high levels of detergent-resistant, silver-positive aggregates of phosphorylated tau in the soma and neurites, as well as filamentous tau, as detected by immunoelectron microscopy. Inhibition of amyloid-beta generation with beta- or gamma-secretase inhibitors not only decreased amyloid-beta pathology, but also attenuated tauopathy. We also found that glycogen synthase kinase 3 (GSK3) regulated amyloid-beta-mediated tau phosphorylation. We have successfully recapitulated amyloid-beta and tau pathology in a single 3D human neural cell culture system. Our unique strategy for recapitulating Alzheimer's disease pathology in a 3D neural cell culture model should also serve to facilitate the development of more precise human neural cell models of other neurodegenerative disorders.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4366007/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4366007/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Choi, Se Hoon -- Kim, Young Hye -- Hebisch, Matthias -- Sliwinski, Christopher -- Lee, Seungkyu -- D'Avanzo, Carla -- Chen, Hechao -- Hooli, Basavaraj -- Asselin, Caroline -- Muffat, Julien -- Klee, Justin B -- Zhang, Can -- Wainger, Brian J -- Peitz, Michael -- Kovacs, Dora M -- Woolf, Clifford J -- Wagner, Steven L -- Tanzi, Rudolph E -- Kim, Doo Yeon -- 5P01AG15379/AG/NIA NIH HHS/ -- 5R37MH060009/MH/NIMH NIH HHS/ -- P01 AG004953/AG/NIA NIH HHS/ -- P01 AG015379/AG/NIA NIH HHS/ -- P30 HD018655/HD/NICHD NIH HHS/ -- P30 NS045776/NS/NINDS NIH HHS/ -- P50 AG005134/AG/NIA NIH HHS/ -- R01 AG014713/AG/NIA NIH HHS/ -- R01 NS045860/NS/NINDS NIH HHS/ -- R21 AG031483/AG/NIA NIH HHS/ -- RF1 AG048080/AG/NIA NIH HHS/ -- England -- Nature. 2014 Nov 13;515(7526):274-8. doi: 10.1038/nature13800. Epub 2014 Oct 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Genetics and Aging Research Unit, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129, USA [2]. ; 1] Genetics and Aging Research Unit, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129, USA [2] Division of Mass Spectrometry Research, Korea Basic Science Institute, Cheongju-si, Chungbuk 363-883, South Korea [3]. ; 1] Genetics and Aging Research Unit, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129, USA [2] Institute of Reconstructive Neurobiology, Life and Brain Center, University of Bonn and Hertie Foundation, 53127 Bonn, Germany. ; Genetics and Aging Research Unit, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129, USA. ; FM Kirby Neurobiology Center, Boston Children's Hospital and Harvard Stem Cell Institute, Boston, Massachusetts 02115, USA. ; The Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA. ; Institute of Reconstructive Neurobiology, Life and Brain Center, University of Bonn and Hertie Foundation, 53127 Bonn, Germany. ; Department of Neurosciences, University of California, San Diego, La Jolla, California 92093, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25307057" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/genetics/*metabolism/*pathology ; Amyloid beta-Peptides/chemistry/genetics/metabolism ; Cell Culture Techniques/*methods ; Cell Differentiation ; Drug Evaluation, Preclinical/methods ; Extracellular Space/metabolism ; Glycogen Synthase Kinase 3/metabolism ; Humans ; Microtubule-Associated Proteins/metabolism ; *Models, Biological ; Neural Stem Cells/*metabolism/pathology ; Neurites/metabolism ; Phosphorylation ; Presenilin-1/metabolism ; Protein Aggregation, Pathological ; Reproducibility of Results ; tau Proteins/chemistry/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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