151
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Synthetic zinc finger repressors reduce mutant huntingtin expression in the brain of R6/2 mice. Proc Natl Acad Sci U S A 2012; 109:E3136-45. [PMID: 23054839 DOI: 10.1073/pnas.1206506109] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Huntington's disease (HD) is a dominantly inherited neurodegenerative disorder caused by expanded CAG repeats in the huntingtin (HTT) gene. Although several palliative treatments are available, there is currently no cure and patients generally die 10-15 y after diagnosis. Several promising approaches for HD therapy are currently in development, including RNAi and antisense analogs. We developed a complementary strategy to test repression of mutant HTT with zinc finger proteins (ZFPs) in an HD model. We tested a "molecular tape measure" approach, using long artificial ZFP chains, designed to bind longer CAG repeats more strongly than shorter repeats. After optimization, stable ZFP expression in a model HD cell line reduced chromosomal expression of the mutant gene at both the protein and mRNA levels (95% and 78% reduction, respectively). This was achieved chromosomally in the context of endogenous mouse HTT genes, with variable CAG-repeat lengths. Shorter wild-type alleles, other genomic CAG-repeat genes, and neighboring genes were unaffected. In vivo, striatal adeno-associated virus viral delivery in R6/2 mice was efficient and revealed dose-dependent repression of mutant HTT in the brain (up to 60%). Furthermore, zinc finger repression was tested at several levels, resulting in protein aggregate reduction, reduced decline in rotarod performance, and alleviation of clasping in R6/2 mice, establishing a proof-of-principle for synthetic transcription factor repressors in the brain.
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152
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Switonski PM, Szlachcic WJ, Gabka A, Krzyzosiak WJ, Figiel M. Mouse models of polyglutamine diseases in therapeutic approaches: review and data table. Part II. Mol Neurobiol 2012; 46:430-66. [PMID: 22944909 PMCID: PMC3461214 DOI: 10.1007/s12035-012-8316-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2012] [Accepted: 07/29/2012] [Indexed: 12/13/2022]
Abstract
Mouse models of human diseases are created both to understand the pathogenesis of the disorders and to find successful therapies for them. This work is the second part in a series of reviews of mouse models of polyglutamine (polyQ) hereditary disorders and focuses on in vivo experimental therapeutic approaches. Like part I of the polyQ mouse model review, this work is supplemented with a table that contains data from experimental studies of therapeutic approaches in polyQ mouse models. The aim of this review was to characterize the benefits and outcomes of various therapeutic strategies in mouse models. We examine whether the therapeutic strategies are specific to a single disease or are applicable to more than one polyQ disorder in mouse models. In addition, we discuss the suitability of mouse models in therapeutic approaches. Although the majority of therapeutic studies were performed in mouse models of Huntington disease, similar strategies were also used in other disease models.
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Affiliation(s)
- Pawel M Switonski
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12/14, 61-704 Poznan, Poland
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153
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Comprehensive review on the HSC70 functions, interactions with related molecules and involvement in clinical diseases and therapeutic potential. Pharmacol Ther 2012; 136:354-74. [PMID: 22960394 DOI: 10.1016/j.pharmthera.2012.08.014] [Citation(s) in RCA: 193] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Accepted: 08/14/2012] [Indexed: 12/28/2022]
Abstract
Heat shock cognate protein 70 (HSC70) is a constitutively expressed molecular chaperone which belongs to the heat shock protein 70 (HSP70) family. HSC70 shares some of the structural and functional similarity with HSP70. HSC70 also has different properties compared with HSP70 and other heat shock family members. HSC70 performs its full functions by the cooperation of co-chaperones. It interacts with many other molecules as well and regulates various cellular functions. It is also involved in various diseases and may become a biomarker for diagnosis and potential therapeutic targets for design, discovery, and development of novel drugs to treat various diseases. In this article, we provide a comprehensive review on HSC70 from the literatures including the basic general information such as classification, structure and cellular location, genetics and function, as well as its protein association and interaction with other proteins. In addition, we also discussed the relationship of HSC70 and related clinical diseases such as cancer, cardiovascular, neurological, hepatic and many other diseases and possible therapeutic potential and highlight the progress and prospects of research in this field. Understanding the functions of HSC70 and its interaction with other molecules will help us to reveal other novel properties of this protein. Scientists may be able to utilize this protein as a biomarker and therapeutic target to make significant advancement in scientific research and clinical setting in the future.
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154
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Viscomi MT, D’Amelio M. The “Janus-Faced Role” of Autophagy in Neuronal Sickness: Focus on Neurodegeneration. Mol Neurobiol 2012; 46:513-21. [DOI: 10.1007/s12035-012-8296-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 06/21/2012] [Indexed: 12/13/2022]
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155
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Kaushik S, Cuervo AM. Chaperone-mediated autophagy: a unique way to enter the lysosome world. Trends Cell Biol 2012; 22:407-17. [PMID: 22748206 DOI: 10.1016/j.tcb.2012.05.006] [Citation(s) in RCA: 595] [Impact Index Per Article: 49.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2012] [Revised: 05/27/2012] [Accepted: 05/29/2012] [Indexed: 01/13/2023]
Abstract
All cellular proteins undergo continuous synthesis and degradation. This permanent renewal is necessary to maintain a functional proteome and to allow rapid changes in levels of specific proteins with regulatory purposes. Although for a long time lysosomes were considered unable to contribute to the selective degradation of individual proteins, the discovery of chaperone-mediated autophagy (CMA) changed this notion. Here, we review the characteristics that set CMA apart from other types of lysosomal degradation and the subset of molecules that confer cells the capability to identify individual cytosolic proteins and direct them across the lysosomal membrane for degradation.
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Affiliation(s)
- Susmita Kaushik
- Department of Developmental and Molecular Biology, Institute for Aging Studies, Marion Bessin Liver Research Center, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Chanin Building 504, Bronx, NY 10461, USA
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156
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Abstract
The combination of two different and independently acting compounds into one covalently linked hybrid compound can convey synergy from the effects of both independently acting moieties to the new composite compound, leading to a pharmacological potency greater than the sum of each individual moiety's potencies. Here, we review a variety of such hybrid compounds, which can consist of various functional parts, molecular recognition or subcellular targeting moieties, or combinations thereof, acting either simultaneously or sequentially. Such moieties within a hybrid compound can consist of a variety of substance classes, including small organic molecules, polypeptides or nucleic acids identified either via rational molecular design or selection from libraries. Precedent for hybrid compounds comes from naturally occurring proteins and small molecules, such as botulinum toxin and bleomycin, which are secreted by micro-organisms. We review the high degree of suitability of hybrid compounds for the treatment of multifactorial diseases by simultaneously hitting several targets along an identified disease pathway. Examples are hybrid compounds against Alzheimer's disease, against the cancer-relevant phosphoinisitide-3-kinase (PI3K)/AKT/mammalian target of rapamycin (mTOR) and epidermal growth factor signaling cascade, or in antimalarial therapy via simultaneous hitting of different mechanisms of hemozoin formation. Molecular recognition by peptides or aptamers (recognition-specific RNA or peptide sequences) can be combined with the transport of small molecule β-sheet breakers or toxins, or targeting to ubiquitin-dependent proteolysis. The vision of molecular nanomachines is currently realized in sequentially acting modular nanotransporters, consisting of four modules including a target, a membrane and nuclear translocation sequence, as well as a drug attachment domain. Through the rational combination of existing drugs and the synergy of their effects, a rapid amplification of their potency may be achieved, greatly accelerating drug development. A further enhancement of simultaneous multitarget action is enabled through the design of multifunctional hybrid drugs with sequential effects that make these hybrid molecules resemble intelligent nanomachines.
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157
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Butler DC, McLear JA, Messer A. Engineered antibody therapies to counteract mutant huntingtin and related toxic intracellular proteins. Prog Neurobiol 2012; 97:190-204. [PMID: 22120646 PMCID: PMC3908675 DOI: 10.1016/j.pneurobio.2011.11.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 11/03/2011] [Accepted: 11/08/2011] [Indexed: 02/07/2023]
Abstract
The engineered antibody approach to Huntington's disease (HD) therapeutics is based on the premise that significantly lowering the levels of the primary misfolded mutant protein will reduce abnormal protein interactions and direct toxic effects of the misfolded huntingtin (HTT). This will in turn reduce the pathologic stress on cells, and normalize intrinsic proteostasis. Intracellular antibodies (intrabodies) are single-chain (scFv) and single-domain (dAb; nanobody) variable fragments that can retain the affinity and specificity of full-length antibodies, but can be selected and engineered as genes. Functionally, they represent a protein-based approach to the problem of aberrant mutant protein folding, post-translational modifications, protein-protein interactions, and aggregation. Several intrabodies that bind on either side of the expanded polyglutamine tract of mutant HTT have been reported to improve the mutant phenotype in cell and organotypic cultures, fruit flies, and mice. Further refinements to the difficult challenges of intraneuronal delivery, cytoplasmic folding, and long-term efficacy are in progress. This review covers published studies and emerging approaches on the choice of targets, selection and engineering methods, gene and protein delivery options, and testing of candidates in cell and animal models. The resultant antibody fragments can be used as direct therapeutics and as target validation/drug discovery tools for HD, while the technology is also applicable to a wide range of neurodegenerative and other diseases that are triggered by toxic proteins.
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Affiliation(s)
- David C. Butler
- Wadsworth Center, New York State Dept. of Health, Albany, NY, United States, 12208
| | | | - Anne Messer
- Wadsworth Center, New York State Dept. of Health, Albany, NY, United States, 12208
- Department of Biomedical Sciences, School of Public Health, University at Albany, SUNY, NY 12201
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158
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Buchser WJ, Laskow TC, Pavlik PJ, Lin HM, Lotze MT. Cell-mediated autophagy promotes cancer cell survival. Cancer Res 2012; 72:2970-9. [PMID: 22505650 DOI: 10.1158/0008-5472.can-11-3396] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Immune effector cells integrate signals that define the nature and magnitude of the subsequent response. Experimental measures for immune cell-mediated lysis of tumors or virally infected targets rely on average responses of permeability or apoptotic changes within a population of targets. Here, we examined individual target cells following interaction with lymphoid effectors. We found that human peripheral blood lymphocytes not only provide lytic signals but also promote autophagy in the remaining cells. At high effector-to-target ratios, autophagy was induced in several human tumors, as assessed by induction of LC3 puncta and diminished p62. Natural killer cells are a primary mediator of this process. In addition, target cell autophagy was enhanced by provision of interleukin (IL)-2, whereas IL-10 attenuated this effect, and cell-to-cell contact strongly enhanced lymphocyte-mediated autophagy. Although IFN-γ can induce autophagy in target cells, IFN-α acted directly on the targets or in concert with lymphocytes to diminish target autophagy in some cell types. Importantly, cell-mediated autophagy promoted resistance from treatment modalities designed to eradicate tumor cells. Our findings therefore show that the lymphocyte-induced cell-mediated autophagy promotes cancer cell survival and may represent an important target for development of novel therapies.
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Affiliation(s)
- William J Buchser
- Department of Surgery, Graduate School of Public Health, University of Pittsburgh and Biostatistics Facility, University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania 15232, USA
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159
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Lee JA. Neuronal autophagy: a housekeeper or a fighter in neuronal cell survival? Exp Neurobiol 2012; 21:1-8. [PMID: 22438673 PMCID: PMC3294068 DOI: 10.5607/en.2012.21.1.1] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Accepted: 02/01/2012] [Indexed: 12/13/2022] Open
Abstract
Neurons have highly dynamic cellular processes for their proper functions such as cell growth, synaptic formation, or synaptic plasticity by regulating protein synthesis and degradation. Therefore, the quality control of proteins in neurons is essential for their physiology and pathology. Autophagy is a cellular degradation pathway by which cytosolic components are sequestered in autophagosomes and degraded upon their fusion with lysosomal components. Thus, the autophagic pathway may play important roles in neuronal cell survival and neuronal function under physiological condition and pathological conditions. Recent several findings suggest that the loss of basal autophagy or imbalance of autophagic flux leads to neurodegeneration. Autophagosomes accumulate abnormally in affected neurons of several neurodegenerative diseases such as Alzheimer's disease (AD), Huntington's disease (HD), Parkinson's disease (PD), or Frontotemporal dementia (FTD). Thus, the understanding how autophagy is associated with several neurological diseases would be the first step for new therapeutic intervention in neurological disorders. In this review, I will discuss the molecular mechanism of autophagy in neurons and autophagy-associated neurodegenerative diseases.
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Affiliation(s)
- Jin-A Lee
- Department of Biotechnology, College of Life Science and Nanotechnology, Hannam University, Dajeon 305-811, Korea
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160
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Abstract
Autophagy contributes to the removal of prone-to-aggregate proteins, but in several instances these pathogenic proteins have been shown to interfere with autophagic activity. In the case of Huntington's disease (HD), a congenital neurodegenerative disorder resulting from mutation in the huntingtin protein, we have previously described that the mutant protein interferes with the ability of autophagic vacuoles to recognize cytosolic cargo. Growing evidence supports the existence of cross talk among autophagic pathways, suggesting the possibility of functional compensation when one of them is compromised. In this study, we have identified a compensatory upregulation of chaperone-mediated autophagy (CMA) in different cellular and mouse models of HD. Components of CMA, namely the lysosome-associated membrane protein type 2A (LAMP-2A) and lysosomal-hsc70, are markedly increased in HD models. The increase in LAMP-2A is achieved through both an increase in the stability of this protein at the lysosomal membrane and transcriptional upregulation of this splice variant of the lamp-2 gene. We propose that CMA activity increases in response to macroautophagic dysfunction in the early stages of HD, but that the efficiency of this compensatory mechanism may decrease with age and so contribute to cellular failure and the onset of pathological manifestations.
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161
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Establishment of a novel fluorescence-based method to evaluate chaperone-mediated autophagy in a single neuron. PLoS One 2012; 7:e31232. [PMID: 22363588 PMCID: PMC3280339 DOI: 10.1371/journal.pone.0031232] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2011] [Accepted: 01/04/2012] [Indexed: 11/19/2022] Open
Abstract
Background Chaperone-mediated autophagy (CMA) is a selective autophagy-lysosome protein degradation pathway. The role of CMA in normal neuronal functions and in neural disease pathogenesis remains unclear, in part because there is no available method to monitor CMA activity at the single-cell level. Methodology/Principal Findings We sought to establish a single-cell monitoring method by visualizing translocation of CMA substrates from the cytosol to lysosomes using the HaloTag (HT) system. GAPDH, a CMA substrate, was fused to HT (GAPDH-HT); this protein accumulated in the lysosomes of HeLa cells and cultured cerebellar Purkinje cells (PCs) after labeling with fluorescent dye-conjugated HT ligand. Lysosomal accumulation was enhanced by treatments that activate CMA and prevented by siRNA-mediated knockdown of LAMP2A, a lysosomal receptor for CMA, and by treatments that inactivate CMA. These results suggest that lysosomal accumulation of GAPDH-HT reflects CMA activity. Using this method, we revealed that mutant γPKC, which causes spinocerebellar ataxia type 14, decreased CMA activity in cultured PCs. Conclusion/Significance In the present study, we established a novel fluorescent-based method to evaluate CMA activity in a single neuron. This novel method should be useful and valuable for evaluating the role of CMA in various neuronal functions and neural disease pathogenesis.
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162
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Liu CR, Chang CR, Chern Y, Wang TH, Hsieh WC, Shen WC, Chang CY, Chu IC, Deng N, Cohen S, Cheng TH. Spt4 Is Selectively Required for Transcription of Extended Trinucleotide Repeats. Cell 2012; 148:690-701. [DOI: 10.1016/j.cell.2011.12.032] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Revised: 10/03/2011] [Accepted: 12/13/2011] [Indexed: 10/28/2022]
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163
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Nagai Y, Nukina N. [Selective degradation of expanded polyglutamine proteins by their specific recognition with QBP1]. Rinsho Shinkeigaku 2012; 51:1108-10. [PMID: 22277499 DOI: 10.5692/clinicalneurol.51.1108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Protein misfolding and aggregation have been recognized as a common molecular pathogenesis of various neurodegenerative diseases including Alzheimer's, Parkinson's, and the polyglutamine (polyQ) diseases. The polyQ diseases, including Huntington's disease and various spinocerebellar ataxias, are caused by abnormal expansions of the polyQ stretch (>35-40) within disease-causative proteins. Recently, defects in protein degradation in the brain have been shown to cause neurodegeneration in genetically-engineered mice, highlighting two important roles of protein degradation systems in neurodegenerative diseases; 1) their dysfunction in the pathogenesis and 2) their activation as a therapy. However, it is indispensable to eliminate only the pathogenic proteins to avoid deleterious side effects. Aiming to selectively degrade the expanded polyQ proteins, we employed QBP1, a peptide which specifically binds to the expanded polyQ stretch. We designed a chimeric protein with the Hsc70 binding motif, a signal sequence for chaperone-mediated autophagy, fused to QBP1 (Hsc70BM-QBP1), and found that Hsc70BM-QBP1 accelerates the selective degradation of expanded polyQ proteins in cell culture. Gene therapy using a viral vector expressing Hsc70BM-QBP1 effectively ameliorates the motor dysfunction and premature death in polyQ disease model mice. We propose that our therapeutic strategy to selectively degrade the pathogenic proteins can also be applied to other neurodegenerative diseases.
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Affiliation(s)
- Yoshitaka Nagai
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry
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164
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Nukina N. [Neurodegeration based on polyglutamine aggregation]. Rinsho Shinkeigaku 2012; 51:976-8. [PMID: 22277447 DOI: 10.5692/clinicalneurol.51.976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
One of the major hypotheses about polyQ toxicity is the sequestration of functionally important proteins into the aggregates. We established and carried out a direct, systematic proteomic analysis of aggregate-interacting proteins (AIPs). This analysis, as well as other studies in our lab, has revealed the following AIPs in addition to our previously reported chaperones: ubiquitin binding proteins such as ubiquilins and Tollip and p62, TLS and transcription factor NF-Y. Although transcriptional dysregulation has been reported in polyQ disease, the precise mechanism has not been clarified. We identified NF-Y as an AIP and found the reduction of NF-Y binding to the promoter region of HSP70, one of the NF-Y targets. Because suppressive roles of HSP70 on the HD pathological process have been shown in several HD models, NF-Y could be an important target of expanded polyQ. We further screened transcription factors, which reduced in HD model mouse, using Protein DNA array and found the decrease of POU domain factor. Based on this result, we confirmed Brn2 is decreased in HD model mouse, which showed the dysfunction of hypothalamus. We proposed the mechanism of hypothalamic dysregulation, suggesting the region specific abnormality could be induced by the imbalance of cellular compensatory mechanism.
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165
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Sridhar S, Botbol Y, Macian F, Cuervo AM. Autophagy and disease: always two sides to a problem. J Pathol 2011; 226:255-73. [PMID: 21990109 DOI: 10.1002/path.3025] [Citation(s) in RCA: 229] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2011] [Revised: 09/25/2011] [Accepted: 10/03/2011] [Indexed: 12/18/2022]
Abstract
Autophagy is a process traditionally known to contribute to cellular cleaning through the removal of intracellular components in lysosomes. In recent years, intensive scrutiny at the molecular level to which autophagy has been subjected has also contributed to expanding our understanding of the physiological role of this pathway. Added to the well-characterized role in quality control, autophagy has proved to be important in the maintenance of cellular homeostasis and of the energetic balance, in cellular and tissue remodelling, and cellular defence against extracellular insults and pathogens. It is not a surprise that, in light of this growing number of physiological functions, connections between autophagic malfunction and human pathologies have also been strengthened. In this review, we focus on several pathological conditions associated with primary or secondary defects in autophagy and comment on a recurring theme for many of them, ie the fact that autophagy can often exert both beneficial and aggravating effects on the progression of disease. Elucidating the factors that determine the switch between these dual functions of autophagy in disease has become a priority when considering the potential therapeutic implications of the pharmacological modulation of autophagy in many of these pathological conditions.
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Affiliation(s)
- Sunandini Sridhar
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
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166
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Abstract
Huntingtin, the protein that when mutated causes Huntington disease (HD), has many known interactors and participates in diverse cellular functions. Mutant Htt (mHtt) engages in a variety of aberrant interactions that lead to pathological gain of toxic functions as well as loss of normal functions. The broad symptomatology of HD, including diminished voluntary motor control, cognitive decline, and psychiatric disturbances, reflects the multifaceted neuropathology. Although currently available therapies for HD focus on symptom management, the autosomal dominant cause and the adult onset make this disease an ideal candidate for genetic intervention. A variety of gene therapy approaches have been tested in mouse models of HD, ranging from those aimed at ameliorating downstream pathology or replacing lost neuronal populations to more upstream strategies to reduce mHtt levels. Here the authors review the results of these preclinical trials.
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Affiliation(s)
- Amber L Southwell
- Centre for Molecular Medicine and Therapeutics, University of British Columbia, Vancouver, BC, Canada.
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167
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Labbadia J, Cunliffe H, Weiss A, Katsyuba E, Sathasivam K, Seredenina T, Woodman B, Moussaoui S, Frentzel S, Luthi-Carter R, Paganetti P, Bates GP. Altered chromatin architecture underlies progressive impairment of the heat shock response in mouse models of Huntington disease. J Clin Invest 2011; 121:3306-19. [PMID: 21785217 PMCID: PMC3148745 DOI: 10.1172/jci57413] [Citation(s) in RCA: 135] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Accepted: 06/03/2011] [Indexed: 01/05/2023] Open
Abstract
Huntington disease (HD) is a devastating neurodegenerative disorder for which there are no disease-modifying treatments. Previous studies have proposed that activation of the heat shock response (HSR) via the transcription factor heat shock factor 1 (HSF1) may be of therapeutic benefit. However, the effect of disease progression on the HSR and the therapeutic potential of this pathway are currently unknown. Here, we used a brain-penetrating HSP90 inhibitor and physiological, molecular, and behavioral readouts to demonstrate that pharmacological activation of HSF1 improves huntingtin aggregate load, motor performance, and other HD-related phenotypes in the R6/2 mouse model of HD. However, the beneficial effects of this treatment were transient and diminished with disease progression. Molecular analyses to understand the transient nature of these effects revealed altered chromatin architecture, reduced HSF1 binding, and impaired HSR accompanied disease progression in both the R6/2 transgenic and HdhQ150 knockin mouse models of HD. Taken together, our findings reveal that the HSR, a major inducible regulator of protein homeostasis and longevity, is disrupted in HD. Consequently, pharmacological induction of HSF1 as a therapeutic approach to HD is more complex than was previously anticipated.
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Affiliation(s)
- John Labbadia
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Helen Cunliffe
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Andreas Weiss
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Elena Katsyuba
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Kirupa Sathasivam
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Tamara Seredenina
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Ben Woodman
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Saliha Moussaoui
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Stefan Frentzel
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Ruth Luthi-Carter
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Paolo Paganetti
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
| | - Gillian P. Bates
- Department of Medical and Molecular Genetics, King’s College London, London, United Kingdom.
Novartis Institutes for BioMedical Research, Neuroscience Discovery, Basel, Switzerland.
Brain Mind Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland
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168
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Cuervo AM. Chaperone-mediated autophagy: Dice's 'wild' idea about lysosomal selectivity. Nat Rev Mol Cell Biol 2011; 12:535-41. [PMID: 21750569 DOI: 10.1038/nrm3150] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A little over 1 year ago, we lost a bright scientist and a dear colleague who, in his younger years, proposed the 'heretical' idea that lysosomes could selectively degrade cytosolic proteins. That scientist was J. Fred Dice, and his lifetime's discovery was the degradative pathway that we now know as chaperone-mediated autophagy.
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Affiliation(s)
- Ana Maria Cuervo
- Department of Developmental and Molecular Biology, Marion Bessin Liver Research Center and Institute for Aging Studies, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
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169
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Koga H, Cuervo AM. Chaperone-mediated autophagy dysfunction in the pathogenesis of neurodegeneration. Neurobiol Dis 2011; 43:29-37. [PMID: 20643207 PMCID: PMC2998583 DOI: 10.1016/j.nbd.2010.07.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Revised: 07/02/2010] [Accepted: 07/09/2010] [Indexed: 10/19/2022] Open
Abstract
Chaperone-mediated autophagy (CMA) contributes to selective degradation of individual soluble proteins in lysosomes. Unique to this type of autophagy is the fact that proteins reach the lysosomal lumen for degradation by directly crossing the lysosomal membrane, in contrast with the vesicle-mediated delivery characteristic of the other types of autophagy. These two characteristics--selective targeting and direct translocation of substrates--determine the contribution of CMA to different physiological functions and the type of pathological conditions associated with CMA dysfunction. In this review, we briefly revise recent findings on the molecular mechanisms behind CMA function, and describe the physiological relevance of the selective lysosomal degradation through this pathway. We also comment on the cellular consequences of CMA malfunction and on the connections already established between CMA dysfunction and different human disorders, with special emphasis on neurodegenerative diseases. This article is part of a Special Issue entitled "Autophagy and protein degradation in neurological diseases."
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Affiliation(s)
- Hiroshi Koga
- Department of Developmental and Molecular Biology, Institute for Aging Research, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY, USA.
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170
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Popiel HA, Burke JR, Strittmatter WJ, Oishi S, Fujii N, Takeuchi T, Toda T, Wada K, Nagai Y. The Aggregation Inhibitor Peptide QBP1 as a Therapeutic Molecule for the Polyglutamine Neurodegenerative Diseases. JOURNAL OF AMINO ACIDS 2011; 2011:265084. [PMID: 22312459 PMCID: PMC3268222 DOI: 10.4061/2011/265084] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Accepted: 05/04/2011] [Indexed: 11/20/2022]
Abstract
Misfolding and abnormal aggregation of proteins in the brain are implicated in the pathogenesis of various neurodegenerative diseases including Alzheimer's, Parkinson's, and the polyglutamine (polyQ) diseases. In the polyQ diseases, an abnormally expanded polyQ stretch triggers misfolding and aggregation of the disease-causing proteins, eventually resulting in neurodegeneration. In this paper, we introduce our therapeutic strategy against the polyQ diseases using polyQ binding peptide 1 (QBP1), a peptide that we identified by phage display screening. We showed that QBP1 specifically binds to the expanded polyQ stretch and inhibits its misfolding and aggregation, resulting in suppression of neurodegeneration in cell culture and animal models of the polyQ diseases. We further demonstrated the potential of protein transduction domains (PTDs) for in vivo delivery of QBP1. We hope that in the near future, chemical analogues of aggregation inhibitor peptides including QBP1 will be developed against protein misfolding-associated neurodegenerative diseases.
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Affiliation(s)
- H. Akiko Popiel
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - James R. Burke
- Department of Medicine (Neurology) and Deane Laboratory, Duke University Medical Center, Durham, NC 27710, USA
| | - Warren J. Strittmatter
- Department of Medicine (Neurology) and Deane Laboratory, Duke University Medical Center, Durham, NC 27710, USA
| | - Shinya Oishi
- Department of Bioorganic Medicinal Chemistry, Kyoto University Graduate School of Pharmaceutical Sciences, Kyoto 606-8501, Japan
| | - Nobutaka Fujii
- Department of Bioorganic Medicinal Chemistry, Kyoto University Graduate School of Pharmaceutical Sciences, Kyoto 606-8501, Japan
| | - Toshihide Takeuchi
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Tatsushi Toda
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
| | - Keiji Wada
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Yoshitaka Nagai
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Saitama 332-0012, Japan
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171
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Strategies for regenerating striatal neurons in the adult brain by using endogenous neural stem cells. Neurol Res Int 2011; 2011:898012. [PMID: 21766028 PMCID: PMC3135217 DOI: 10.1155/2011/898012] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Accepted: 04/04/2011] [Indexed: 01/03/2023] Open
Abstract
Currently, there is no effective treatment for the marked neuronal loss caused by neurodegenerative diseases, such as Huntington's disease (HD) or ischemic stroke. However, recent studies have shown that new neurons are continuously generated by endogenous neural stem cells in the subventricular zone (SVZ) of the adult mammalian brain, including the human brain. Because some of these new neurons migrate to the injured striatum and differentiate into mature neurons, such new neurons may be able to replace degenerated neurons and improve or repair neurological deficits. To establish a neuroregenerative therapy using this endogenous system, endogenous regulatory mechanisms that can be co-opted for efficient regenerative interventions must be understood, along with any potential drawbacks. Here, we review current knowledge on the generation of new neurons in the adult brain and discuss their potential for use in replacing striatal neurons lost to neurodegenerative diseases, including HD, and to ischemic stroke.
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172
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Li W, Yang Q, Mao Z. Chaperone-mediated autophagy: machinery, regulation and biological consequences. Cell Mol Life Sci 2011; 68:749-63. [PMID: 20976518 PMCID: PMC11114861 DOI: 10.1007/s00018-010-0565-6] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Revised: 10/07/2010] [Accepted: 10/08/2010] [Indexed: 10/18/2022]
Abstract
Degradation of dysfunctional intracellular components in the lysosome system can occur through three different pathways, i.e., macroautophagy, microautophagy and chaperone-mediated autophagy (CMA). In this review, we focus on CMA, a type of autophagy distinct from the other two autophagic pathways owing to its selectivity, saturability and competitivity by which a subset of long-lived cytosolic soluble proteins are directly delivered into the lysosomal lumen via specific receptors. CMA participates in quality control to maintain normal cell functions by clearing "old" proteins and provides energy to cells under nutritional stress. Deregulation of CMA has recently been shown to underlie some diseases, especially neurodegenerative disorders for which the decline with age in the activity of CMA may become a major aggravating factor. Therefore, targeting aberrant alteration in CMA under pathological conditions could serve as a potential therapeutic strategy for treating related diseases.
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Affiliation(s)
- Wenming Li
- Departments of Pharmacology and Neurology, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Qian Yang
- Departments of Pharmacology and Neurology, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Zixu Mao
- Departments of Pharmacology and Neurology, Emory University School of Medicine, Atlanta, GA 30322 USA
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173
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Trancikova A, Ramonet D, Moore DJ. Genetic Mouse Models of Neurodegenerative Diseases. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2011; 100:419-82. [DOI: 10.1016/b978-0-12-384878-9.00012-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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174
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Jones L, Hughes A. Pathogenic mechanisms in Huntington's disease. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2011; 98:373-418. [PMID: 21907095 DOI: 10.1016/b978-0-12-381328-2.00015-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Huntington's disease (HD) is an autosomal dominant, progressive neurodegenerative disorder presenting in midlife. Multiple pathogenic mechanisms which hypothesise how the expanded CAG repeat causes manifest disease have been suggested since the mutation was first detected. These mechanisms include events that operate at both the gene and protein levels. It has been proposed that somatic instability of the CAG repeat could underlie the striatal-specific pathology observed in HD, although how this occurs and what consequences this has in the disease state remain unknown. The form in which the Htt protein exists within the cell has been extensively studied in terms of both its role in aggregate formation and its cellular processing. Protein-protein interactions, post-translational modifications and protein cleavage have all been suggested to contribute to HD pathogenesis. The potential downstream effects of the mutant Htt protein are also noted here. In particular, the adverse effect of the mutant Htt protein on cellular protein degradation, subcellular transport and transcription are explored, and its role in energy metabolism and excitotoxicity investigated. Elucidating the mechanisms at work in HD pathogenesis and determining when they occur in relation to disease is an important step in the pathway to therapeutic interventions.
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Affiliation(s)
- Lesley Jones
- MRC Centre for Neuropsychiatric Genetics and Genomics, School of Medicine, Cardiff University, UK
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175
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Arias E, Cuervo AM. Chaperone-mediated autophagy in protein quality control. Curr Opin Cell Biol 2010; 23:184-9. [PMID: 21094035 DOI: 10.1016/j.ceb.2010.10.009] [Citation(s) in RCA: 222] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Revised: 10/01/2010] [Accepted: 10/21/2010] [Indexed: 10/18/2022]
Abstract
Chaperone-mediated autophagy is a selective mechanism for degradation of soluble cytosolic proteins in lysosomes that distinguishes itself from other autophagic pathways by the selectivity with which CMA substrates are targeted for degradation. The recent molecular dissection of this autophagic pathway and the development of experimental models with compromised CMA have unveiled the important contribution of this pathway to protein quality control. In fact, CMA activation seems to be a common mechanism of cellular defense against proteotoxicity.
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Affiliation(s)
- Esperanza Arias
- Department of Developmental and Molecular Biology and Institute for Aging Studies, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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176
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Banerjee R, Beal MF, Thomas B. Autophagy in neurodegenerative disorders: pathogenic roles and therapeutic implications. Trends Neurosci 2010; 33:541-9. [PMID: 20947179 DOI: 10.1016/j.tins.2010.09.001] [Citation(s) in RCA: 165] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Revised: 09/07/2010] [Accepted: 09/07/2010] [Indexed: 12/19/2022]
Abstract
Autophagy is a highly conserved intracellular pathway involved in the elimination of proteins and organelles by lysosomes. Known originally as an adaptive response to nutrient deprivation in mitotic cells, autophagy is now recognized as an arbiter of neuronal survival and death decisions in neurodegenerative diseases. Studies using postmortem human tissue, genetic and toxin-induced animal and cellular models indicate that many of the etiological factors associated with neurodegenerative disorders can perturb the autophagy process. Emerging data support the view that dysregulation of autophagy might play a critical role in the pathogenesis of neurodegenerative disorders. In this review, we highlight the pathophysiological roles of autophagy and its potential therapeutic implications in debilitating neurodegenerative disorders, including amyotrophic lateral sclerosis and Alzheimer's, Parkinson's and Huntington's diseases.
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Affiliation(s)
- Rebecca Banerjee
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, 525 East 68(th) Street, A-501, New York, NY 10065
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177
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Durcan TM, Kontogiannea M, Thorarinsdottir T, Fallon L, Williams AJ, Djarmati A, Fantaneanu T, Paulson HL, Fon EA. The Machado-Joseph disease-associated mutant form of ataxin-3 regulates parkin ubiquitination and stability. Hum Mol Genet 2010; 20:141-54. [PMID: 20940148 DOI: 10.1093/hmg/ddq452] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Machado-Joseph disease (MJD), the most common dominantly inherited ataxia worldwide, is caused by a polyglutamine (polyQ) expansion in the deubiquitinating (DUB) enzyme ataxin-3. Interestingly, MJD can present clinically with features of Parkinsonism. In this study, we identify parkin, an E3 ubiquitin-ligase responsible for a common familial form of Parkinson's disease, as a novel ataxin-3 binding partner. The interaction between ataxin-3 and parkin is direct, involves multiple domains and is greatly enhanced by parkin self-ubiquitination. Moreover, ataxin-3 deubiquitinates parkin directly in vitro and in cells. Compared with wild-type ataxin-3, MJD-linked polyQ-expanded mutant ataxin-3 is more active, possibly owing to its greater efficiency at DUB K27- and K29-linked Ub conjugates on parkin. Remarkably, mutant but not wild-type ataxin-3 promotes the clearance of parkin via the autophagy pathway. The finding is consistent with the reduction in parkin levels observed in the brains of transgenic mice over-expressing polyQ-expanded but not wild-type ataxin-3, raising the intriguing possibility that increased turnover of parkin may contribute to the pathogenesis of MJD and help explain some of its parkinsonian features.
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Affiliation(s)
- Thomas M Durcan
- Centre for Neuronal Survival and McGill Parkinson Program, Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
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178
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Crews CM. Targeting the undruggable proteome: the small molecules of my dreams. ACTA ACUST UNITED AC 2010; 17:551-5. [PMID: 20609404 DOI: 10.1016/j.chembiol.2010.05.011] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2010] [Revised: 05/10/2010] [Accepted: 05/11/2010] [Indexed: 01/19/2023]
Abstract
Biologically active small molecules have long proven useful in the exploration of cell biology. Although many early compounds were by-products of drug development efforts, recent increased small molecule screening efforts in academia have expanded the repertoire of biological processes investigated to include areas of biology that are not of immediate pharmaceutical interest. Many of these new bioassays score for small molecule-induced phenotypic changes at the cellular or even organismal level and thus have been described as "chemical genetic" screens. However, this analogy with traditional genetic screens is misleading; although each gene has roughly an equivalent chance of being mutated in a traditional genetic screen, the amount of "proteomic space" that a chemical genetics approach can reach using current small molecule libraries is considerably smaller. Thus, new chemical biology methodologies are needed to target the remaining "undruggable proteome" with small druglike molecules.
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Affiliation(s)
- Craig M Crews
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06511, USA.
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