| Laforin is required for the functional activation of malin in endoplasmic reticulum stress resistance in neuronal cells. | |
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MedLine Citation:
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PMID: 22578008 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Mutations in either EPM2A, the gene encoding a dual-specificity phosphatase named laforin, or NHLRC1, the gene encoding an E3 ubiquitin ligase named malin, cause Lafora disease in humans. Lafora disease is a fatal neurological disorder characterized by progressive myoclonus epilepsy, severe neurological deterioration and accumulation of poorly branched glycogen inclusions, called Lafora bodies or polyglucosan bodies, within the cell cytoplasm. The molecular mechanism underlying the neuropathogenesis of Lafora disease remains unknown. Here, we present data demonstrating that in the cells expressing low levels of laforin protein, overexpressed malin and its Lafora disease-causing missense mutants are stably polyubiquitinated. Malin and malin mutants form ubiquitin-positive aggregates in or around the nuclei of the cells in which they are expressed. Neither wild-type malin nor its mutants elicit endoplasmic reticulum stress, although the mutants exaggerate the response to endoplasmic reticulum stress. Overexpressed laforin impairs the polyubiquitination of malin while it recruits malin to polyglucosan bodies. The recruitment and activities of laforin and malin are both required for the polyglucosan body disruption. Consistently, targeted deletion of laforin in brain cells from Epm2a knockout mice increases polyubiquitinated proteins. Knockdown of Epm2a or Nhlrc1 in neuronal Neuro2a cells shows that they cooperate to allow cells to resist ER stress and apoptosis. These results reveal that a functional laforin-malin complex plays a critical role in disrupting Lafora bodies and relieving ER stress, implying that a causative pathogenic mechanism underlies their deficiency in Lafora disease. |
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Authors:
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Li Zeng; Yin Wang; Otto Baba; Pan Zheng; Yang Liu; Yan Liu |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural Date: 2012-06-08 |
Journal Detail:
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Title: The FEBS journal Volume: 279 ISSN: 1742-4658 ISO Abbreviation: FEBS J. Publication Date: 2012 Jul |
Date Detail:
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Created Date: 2012-07-03 Completed Date: 2012-10-08 Revised Date: 2013-04-16 |
Medline Journal Info:
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Nlm Unique ID: 101229646 Medline TA: FEBS J Country: England |
Other Details:
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Languages: eng Pagination: 2467-78 Citation Subset: IM |
Copyright Information:
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© 2012 The Authors Journal compilation © 2012 FEBS. |
Affiliation:
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Department of Surgery, University of Michigan Medical Center, Ann Arbor, MI 48109, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blotting, Western Cell Line, Tumor Dual-Specificity Phosphatases / genetics, metabolism* Endoplasmic Reticulum Stress* Female Glucans / metabolism HEK293 Cells Humans Immunoprecipitation Inclusion Bodies / genetics, metabolism Lafora Disease / genetics, metabolism Male Mice Mice, 129 Strain Mice, Inbred C57BL Mice, Knockout Mutation Neurons / metabolism* Polyubiquitin / metabolism Protein Binding Ubiquitin-Protein Ligases / genetics, metabolism* |
| Grant Support | |
ID/Acronym/Agency:
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1R21CA164469/CA/NCI NIH HHS; 1R21NS062391/NS/NINDS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Glucans; 120904-94-1/Polyubiquitin; 9012-72-0/polyglucosan; EC 3.1.3.48/Dual-Specificity Phosphatases; EC 3.1.3.48/Epm2a protein, mouse; EC 6.3.2.19/NHLRC1 protein, mouse; EC 6.3.2.19/Ubiquitin-Protein Ligases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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