这项工作得到了 DZNE 和居里夫人国际重返社会补助金 (322120 至 D.C.D.) 的资助。

<ol>
	<li>Balch, W. E., Morimoto, R. I., Dillin, A., Kelly, J. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Adapting+proteostasis+for+disease+intervention.">Adapting proteostasis for disease intervention.</a> Science. 319, 916-919 (2008).</li><li>David, D. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Aging+and+the+aggregating+proteome.">Aging and the aggregating proteome.</a> Frontiers in genetics. 3, 247 (2012).</li><li>Hartl, F. U., Bracher, A., Hayer-Hartl, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Molecular+chaperones+in+protein+folding+and+proteostasis.">Molecular chaperones in protein folding and proteostasis.</a> Nature. 475, 324-332 (2011).</li><li>Ayyadevara, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Age-+and+Hypertension-Associated+Protein+Aggregates+in+Mouse+Heart+Have+Similar+Proteomic+Profiles.">Age- and Hypertension-Associated Protein Aggregates in Mouse Heart Have Similar Proteomic Profiles.</a> Hypertension. 67, 1006-1013 (2016).</li><li>David, D. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Widespread+protein+aggregation+as+an+inherent+part+of+aging+in+C.+elegans.">Widespread protein aggregation as an inherent part of aging in C. elegans.</a> PLoS biology. 8, 1000450 (2010).</li><li>Demontis, F., Perrimon, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=FOXO/4E-BP+signaling+in+Drosophila+muscles+regulates+organism-wide+proteostasis+during+aging.">FOXO/4E-BP signaling in Drosophila muscles regulates organism-wide proteostasis during aging.</a> Cell. 143, 813-825 (2010).</li><li>Lechler, M. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Reduced+Insulin/IGF-1+Signaling+Restores+the+Dynamic+Properties+of+Key+Stress+Granule+Proteins+during+Aging.">Reduced Insulin/IGF-1 Signaling Restores the Dynamic Properties of Key Stress Granule Proteins during Aging.</a> Cell reports. 18, 454-467 (2017).</li><li>Reis-Rodrigues, P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Proteomic+analysis+of+age-dependent+changes+in+protein+solubility+identifies+genes+that+modulate+lifespan.">Proteomic analysis of age-dependent changes in protein solubility identifies genes that modulate lifespan.</a> Aging cell. 11, 120-127 (2012).</li><li>Tanase, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Role+of+Carbonyl+Modifications+on+Aging-Associated+Protein+Aggregation.">Role of Carbonyl Modifications on Aging-Associated Protein Aggregation.</a> Scientific reports. 6, 19311 (2016).</li><li>Walther, D. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Widespread+Proteome+Remodeling+and+Aggregation+in+Aging+C.+elegans.">Widespread Proteome Remodeling and Aggregation in Aging C. elegans.</a> Cell. 161, 919-932 (2015).</li><li>Lee, V. M., Wang, J., Trojanowski, J. Q. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Purification+of+paired+helical+filament+tau+and+normal+tau+from+human+brain+tissue.">Purification of paired helical filament tau and normal tau from human brain tissue.</a> Methods in enzymology. 309, 81-89 (1999).</li><li>Goudeau, J., Aguilaniu, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Carbonylated+proteins+are+eliminated+during+reproduction+in+C.+elegans.">Carbonylated proteins are eliminated during reproduction in C. elegans.</a> Aging cell. 9, 991-1003 (2010).</li><li>Zimmerman, S. M., Hinkson, I. V., Elias, J. E., Kim, S. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Reproductive+Aging+Drives+Protein+Accumulation+in+the+Uterus+and+Limits+Lifespan+in+C.+elegans.">Reproductive Aging Drives Protein Accumulation in the Uterus and Limits Lifespan in C. elegans.</a> PLoS genetics. 11, 1005725 (2015).</li><li>Uno, M., Nishida, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lifespan-regulating+genes+in+C.+elegans.">Lifespan-regulating genes in C. elegans.</a> Npj Aging And Mechanisms Of Disease. 2, 16010 (2016).</li><li>Sulston, J. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> The Nematode Caenorhabditis elegans. , 587-606 (1988).</li><li>Maine, E. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=RNAi+As+a+tool+for+understanding+germline+development+in+Caenorhabditis+elegans:+uses+and+cautions.">RNAi As a tool for understanding germline development in Caenorhabditis elegans: uses and cautions.</a> Developmental biology. 239, 177-189 (2001).</li><li>Rauniyar, N., Yates, J. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isobaric+labeling-based+relative+quantification+in+shotgun+proteomics.">Isobaric labeling-based relative quantification in shotgun proteomics.</a> Journal of proteome research. 13, 5293-5309 (2014).</li><li>Brignull, H. R., Morley, J. F., Garcia, S. M., Morimoto, R. I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Modeling+polyglutamine+pathogenesis+in+C.+elegans.">Modeling polyglutamine pathogenesis in C. elegans.</a> Methods in enzymology. 412, 256-282 (2006).</li><li>Fay, D. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Classical+genetic+methods.">Classical genetic methods.</a> WormBook. , 1-58 (2013).</li><li>Brunquell, J., Bowers, P., Westerheide, S. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluorodeoxyuridine+enhances+the+heat+shock+response+and+decreases+polyglutamine+aggregation+in+an+HSF-1-dependent+manner+in+Caenorhabditis+elegans.">Fluorodeoxyuridine enhances the heat shock response and decreases polyglutamine aggregation in an HSF-1-dependent manner in Caenorhabditis elegans.</a> Mech Ageing Dev. 141, 1-4 (2014).</li><li>Angeli, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+DNA+synthesis+inhibitor+is+protective+against+proteotoxic+stressors+via+modulation+of+fertility+pathways+in+Caenorhabditis+elegans.">A DNA synthesis inhibitor is protective against proteotoxic stressors via modulation of fertility pathways in Caenorhabditis elegans.</a> Aging (Albany NY). 5, 759-769 (2013).</li><li>Feldman, N., Kosolapov, L., Ben-Zvi, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluorodeoxyuridine+improves+Caenorhabditis+elegans+proteostasis+independent+of+reproduction+onset.">Fluorodeoxyuridine improves Caenorhabditis elegans proteostasis independent of reproduction onset.</a> PLoS One. 9, 85964 (2014).</li><li>Davies, S. K., Leroi, A. M., Bundy, J. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluorodeoxyuridine+affects+the+identification+of+metabolic+responses+to+daf-2+status+in+Caenorhabditis+elegans.">Fluorodeoxyuridine affects the identification of metabolic responses to daf-2 status in Caenorhabditis elegans.</a> Mech Ageing Dev. 133, 46-49 (2012).</li><li>Luo, S., Kleemann, G. A., Ashraf, J. M., Shaw, W. M., Murphy, C. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=TGF-beta+and+insulin+signaling+regulate+reproductive+aging+via+oocyte+and+germline+quality+maintenance.">TGF-beta and insulin signaling regulate reproductive aging via oocyte and germline quality maintenance.</a> Cell. 143, 299-312 (2010).</li><li>Andux, S., Ellis, R. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Apoptosis+maintains+oocyte+quality+in+aging+Caenorhabditis+elegans+females.">Apoptosis maintains oocyte quality in aging Caenorhabditis elegans females.</a> PLoS genetics. 4, 1000295 (2008).</li><li>Vilchez, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=RPN-6+determines+C.+elegans+longevity+under+proteotoxic+stress+conditions.">RPN-6 determines C. elegans longevity under proteotoxic stress conditions.</a> Nature. 489, 263-268 (2012).</li><li>Ghazi, A., Henis-Korenblit, S., Kenyon, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+transcription+elongation+factor+that+links+signals+from+the+reproductive+system+to+lifespan+extension+in+Caenorhabditis+elegans.">A transcription elongation factor that links signals from the reproductive system to lifespan extension in Caenorhabditis elegans.</a> PLoS genetics. 5, 1000639 (2009).</li><li>Shemesh, N., Shai, N., Meshnik, L., Katalan, R., Ben-Zvi, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Uncoupling+the+Trade-Off+between+Somatic+Proteostasis+and+Reproduction+in+Caenorhabditis+elegans+Models+of+Polyglutamine+Diseases.">Uncoupling the Trade-Off between Somatic Proteostasis and Reproduction in Caenorhabditis elegans Models of Polyglutamine Diseases.</a> Front Mol Neurosci. 10, 101 (2017).</li><li>Kaletsky, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+C.+elegans+adult+neuronal+IIS/FOXO+transcriptome+reveals+adult+phenotype+regulators.">The C. elegans adult neuronal IIS/FOXO transcriptome reveals adult phenotype regulators.</a> Nature. 529, 92-96 (2016).</li><li>Kawarabayashi, T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Age-dependent+changes+in+brain,+CSF,+and+plasma+amyloid+(beta)+protein+in+the+Tg2576+transgenic+mouse+model+of+Alzheimer's+disease.">Age-dependent changes in brain, CSF, and plasma amyloid (beta) protein in the Tg2576 transgenic mouse model of Alzheimer's disease.</a> The Journal of neuroscience : the official journal of the Society for Neuroscience. 21, 372-381 (2001).</li><li>Kraemer, B. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neurodegeneration+and+defective+neurotransmission+in+a+Caenorhabditis+elegans+model+of+tauopathy.">Neurodegeneration and defective neurotransmission in a Caenorhabditis elegans model of tauopathy.</a> Proceedings of the National Academy of Sciences of the United States of America. 100, 9980-9985 (2003).</li></ol>

作者没有什么可透露的。

在这里, 我们报告了一种方法, 以隔离高不溶性蛋白聚合体的老化线虫受 rna 干扰分析的质谱法和西方印迹。我们表明通过减少 IIS 来改善 proteostasis 可以大大防止年龄依赖性的蛋白质聚集。通过在线虫中选择特定的聚集易过度蛋白, 可以进一步解剖调节固有蛋白质聚集的机制。
固有年龄依赖性蛋白质聚集与疾病相关蛋白聚集 目前的工作是根据先前?...

蛋白质折叠和聚集被认为是一些神经退行性疾病的标志, 如 AD, PD, 肌萎缩侧索硬化症 (ALS), 颞痴呆 (FTD), 和许多其他。例如, α-核组装成淀粉样纤维, 在帕金森病患者的黑质中积累为路易体体, 而 ALS 患者 TDP-43 或 FUS 错误在退化的运动神经元中形成细胞质聚集。在这些神经退行性疾病中, 维持蛋白质稳态或 proteostasis 的机制无法阻止错误蛋白的积累, 从而导致疾病。
Proteostasis 是至关重要的, 以确保细胞功能和正常情况下, 这些调控机制严格控制蛋白质的合成, 折叠和降解率。几项研究表明, 随着衰老, 许多细胞和器官保存蛋白质稳态的能力逐渐受到损害, proteostasis 网络的生理退化是一个重要的加重因素神经退行性疾病 (参考1,2,3)。事实上, 蛋白质的质量控制和细胞对展开的蛋白质应激的反应受到年龄的影响, 表明蛋白质折叠和聚集可能是衰老的一般后果。事实上, 我们和其他人已经证明, 蛋白质聚集不限于疾病, 而不是部分的蛋白质组成为高洗涤剂-不溶于老年动物4,5,6,7 ,8,9,10。计算和体内分析显示, 这些生理年龄相关的团聚体在几个方面类似于疾病聚集,5。发现内源性, 年龄依赖性的蛋白质聚集使我们有机会解剖的分子和细胞机制, 调节蛋白质聚集, 不使用 ectopically 表达的人类疾病相关的蛋白质。目前, 关于广泛的蛋白质不的调控, 以及这种失调对机体健康的影响, 只存在有限的信息。
线虫是在衰老研究中最广泛研究的模型生物之一, 因为这些动物的寿命相对较短, 并且在较高的生物体中表现出许多特征老化特征. 通过基于微分溶解度的序贯生化分馏技术, 研究了衰老对蛋白质不的影响, 广泛应用于神经研究领域中的疾病聚集物的提取 11.通过定量质谱法, 在没有疾病5的情况下, 显示了数百个蛋白质在C. 线虫中变得容易聚集。在这里, 我们详细地描述了在液体培养中生长大量蠕虫的协议, 以及用质谱法分离聚合蛋白质并通过印迹分析的顺序提取。由于错误和聚集倾向的蛋白质积累在老年的线虫性腺和其他躯体组织的面具变化5,12,13, 我们使用无性腺突变体来集中分析蛋白质不在非组织中。所提出的方法可以分析不溶于 0.5% SDS 的高不溶大团聚体, 并通过相对较低的离心速度进行颗粒化。另外, 在其他地方也发布了一个不太严格的提取协议来收集更小、更可溶解的聚合体,10。此外, 我们还描述了用于评估C. 线虫中的聚合在体内的方法。
总的来说, 这些方法与 rna 干扰结合, 可以评估一个基因在调节年龄依赖性蛋白质聚集中的作用。为此, 我们描述的分析, 从年轻和年老的蠕虫的提取物, 并没有被击倒的特定蛋白质的兴趣使用 rna 干扰。这些方法应该是一个强大的工具, 以确定哪些组成部分的 proteostasis 网络调节蛋白质不。一些干预措施, 如减少胰岛素/胰岛素样生长因子 (igf-i) 1 信号 (IIS) 已被证明显着延迟C. 线虫老化14。长寿途径往往诱导蛋白质质量控制机制, 因此这些途径可以积极影响蛋白质聚集率。例如, 我们在抑制 IIS 路径7时演示了在长寿命的动物中减少固有的蛋白质聚集。

<table><tbody><tr><td>Fernbach culture flask&amp;nbsp;</td><td>Corning</td><td>4425-2XL</td><td>Pyrex, Capacity 2,800 ml, with 3 baffle indents</td></tr><tr><td>Membrane Screw Cap&amp;nbsp;</td><td>Schott</td><td>1088655</td><td>GL45</td></tr><tr><td>Nutating Mixer</td><td>VWR</td><td>444-0148</td><td></td></tr><tr><td>Separatory funnel</td><td>Nalgene</td><td>4300-1000</td><td>Capacity 1,000 ml</td></tr><tr><td>1 ml syringe&amp;nbsp;</td><td>BD Plastipak</td><td>300013</td><td></td></tr><tr><td>Gray needle, 27 G x &amp;frac12; &quot;, 0.4 mm x 13 mm</td><td>BD Microlance 3</td><td>300635</td><td></td></tr><tr><td>Membrane filters 0.025 &amp;micro;M</td><td>Millipore</td><td>VSWP04700</td><td></td></tr><tr><td>pH strip</td><td>Machery-Nagel</td><td>92110</td><td>pH-Fix 0-14</td></tr><tr><td>Protease Inhibitor Cocktail</td><td>Roche</td><td>4693132001</td><td>Complete Mini EDTA-free tablets&amp;nbsp;</td></tr><tr><td>Octoxynol-9&amp;nbsp;</td><td>Applichem</td><td>A1388</td><td>Triton X-100</td></tr><tr><td>4-Morpholineethanesulfonic acid (MES)</td><td>Sigma-Aldrich</td><td>M1317</td><td></td></tr><tr><td>Nonylphenylpolyethylenglycol</td><td>Applichem</td><td>A1694</td><td>Nonidet P40 (NP40)</td></tr><tr><td>DNaseI</td><td>Roche</td><td>04716728001</td><td>recombinant, RNase free</td></tr><tr><td>RNaseA</td><td>Promega</td><td>A7973</td><td>solution</td></tr><tr><td>Total protein blot staining</td><td>Thermofisher</td><td>S11791</td><td>Sypro Ruby protein blot stain</td></tr><tr><td>Total protein gel staining</td><td>Thermofisher</td><td>S12001</td><td>Sypro Ruby protein gel stain</td></tr><tr><td>TCEP (tris (2-carboxyethyl) phosphine hydrochloride)</td><td>Serva</td><td>36970</td><td></td></tr><tr><td>Iodoacetamide</td><td>Serva</td><td>26710</td><td></td></tr><tr><td>Ammoniumbicarbonate</td><td>Sigma-Aldrich</td><td>09830</td><td></td></tr><tr><td>Sequencing Grade Modified Trypsin</td><td>Promega</td><td>V5111</td><td></td></tr><tr><td>Isobaric tags for relative and absolute quantitation</td><td>Sciex</td><td>4352135</td><td>iTRAQ Reagents Multiplex Kit</td></tr><tr><td>Centrifuge Avanti J-26XP</td><td>Beckmann Coulter</td><td>393126</td><td></td></tr><tr><td>Ultracentrifuge Optima Max-XP</td><td>Beckmann Coulter</td><td>393315</td><td></td></tr><tr><td>Centrifuge 5424R</td><td>Eppendorf</td><td>5404000413</td><td></td></tr><tr><td>Centrifuge 5702</td><td>Eppendorf</td><td>5702000329</td><td></td></tr><tr><td>Centrifuge Megafuge 40R</td><td>Thermo Scientific</td><td>75004518</td><td></td></tr><tr><td>Concentrator Plus</td><td>Eppendorf</td><td>5305000304</td><td>Centrifugal evaporator</td></tr><tr><td>Fluorescent stereo-microscope M165 FC&amp;nbsp;</td><td>Leica</td><td></td><td>With Planapo 2.0x objective</td></tr><tr><td>Dissection microscope</td><td>Leica&amp;nbsp;</td><td></td><td>Leica S6E</td></tr><tr><td>High magnification microscope Zeiss Axio Observer Z1</td><td>Zeiss</td><td></td><td>With PlanAPOCHROMAT 20x objective and Zeiss Axio Cam MRm</td></tr><tr><td>&lt;strong&gt;Software&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>Image analysis software</td><td>ImageJ</td><td></td><td></td></tr><tr><td>Analysis of mass spectrometry data</td><td>Protein Prospector</td><td></td><td>http://prospector.ucsf.edu/prospector/mshome.htm</td></tr><tr><td>&lt;strong&gt;E.coli strain&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>OP50</td><td>CGC</td><td></td><td></td></tr><tr><td>&lt;strong&gt;RNAi bacteria&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>L4440</td><td>Julie Ahringer RNAi library</td><td></td><td></td></tr><tr><td>&lt;strong&gt;&lt;em&gt;C. elegans&lt;/em&gt; mutants&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>CF2253</td><td>CGC, strain name: EJ1158&amp;nbsp;</td><td></td><td>Genotype: &lt;em&gt;gon-2(q388)&lt;/em&gt;</td></tr><tr><td>&lt;strong&gt;&lt;em&gt;C. elegans&lt;/em&gt; transgenics&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>DCD214</td><td>Della David&#039;s lab at DZNE T&amp;uuml;bingen</td><td></td><td>Genotype: &lt;em&gt;N2; uqIs24[Pmyo-2::tagrfp::pab-1]&lt;/em&gt;</td></tr><tr><td>DCD215</td><td>Della David&#039;s lab at DZNE T&amp;uuml;bingen</td><td></td><td>Genotype: &lt;em&gt;daf-2(e1370) III; uqIs24[Pmyo-2::tagrfp::pab-1]&lt;/em&gt;</td></tr></tbody></table>

methods to study changes in inherent protein aggregation with age in caenorhabditis elegans

在过去的几十年中, 神经退行性疾病的流行, 如阿尔茨海默氏病 (AD) 和帕金森氏症 (PD), 已经增长。这些年龄相关的疾病的特点是在这些患者的大脑中出现了纤维结构的蛋白质聚集。确切地说, 为什么通常可溶性蛋白质会经历一个聚集过程仍然是不清楚的。发现蛋白质聚集不限于疾病过程, 而是正常衰老过程的一部分, 使研究的分子和细胞机制, 调节蛋白质聚集, 不使用 ectopically 表达人类疾病相关的蛋白质。在这里, 我们描述了通过互补的方法来检查线虫线虫中固有的蛋白质聚集的方法。首先, 我们将研究如何培养大量的年龄同步的线虫来获取衰老的动物, 我们提出了分离高不溶性大团聚体的生物化学程序。结合有针对性的基因击倒, 它可以解剖的作用, 一个基因的兴趣, 以促进或防止年龄依赖性的蛋白质聚集通过使用的综合分析与定量质谱或candidate-based 分析与抗体。然后通过体内分析, 用转基因动物表达荧光标记的聚集易发蛋白来证实这些结果。这些方法应该有助于澄清为什么某些蛋白质容易聚集与年龄和最终如何保持这些蛋白质完全功能。

我们使用这里提出的方法来评估如何长寿命的动物与减少的 IIS 调节年龄依赖性蛋白质聚集。由西部污点 (参见步骤 2.2, 快速不溶蛋白提取为西部污点分析), 我们分析了总和不溶蛋白内容的年轻人 (3 天成人) 和年龄 (18 天成人) 蠕虫在控制 rna 干扰和以 rna 干扰为目标胰岛素IGF-1-like 受体daf-2。我们观察到, 在总蛋白水平上, 年龄或控制与daf-2 rna 干扰条件 (<strong cla...

Watch this Scientific Journal Video about Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans at JoVE.com

Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans

方法研究线虫线虫中固有的蛋白质聚集与年龄的变化

本文所提出的方法的目的是在模型生物体的正常衰老过程中, 探索蛋白质的聚集性, 即线虫。该协议代表了一个强大的工具, 以研究高度不溶性的大骨料, 形成与年龄和确定如何改变 proteostasis 影响蛋白质聚集。

In the last decades, the prevalence of neurodegenerative disorders, such as Alzheimer's disease (AD) and Parkinson's disease (PD), has grown. These ...

methods-to-study-changes-inherent-protein-aggregation-with-age

Universidad de Cartagena UDEC

Research

JoVE Journal

Biology

Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans

8.4K 次观看.  German Center for Neurodegenerative Diseases (DZNE). 本文所提出的方法的目的是在模型生物体的正常衰老过程中, 探索蛋白质的聚集性, 即线虫。该协议代表了一个强大的工具, 以研究高度不溶性的大骨料, 形成与年龄和确定如何改变 proteostasis 影响蛋白质聚集。

视频: Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans

Characterization of Amyloid Structures in Aging C. Elegans Using Fluorescence Lifetime Imaging

Amyloid fibrils are associated with a number of neurodegenerative diseases such as Huntington&#39;s, Parkinson&#39;s, or Alzheimer&#39;s disease. These amyloid fibrils can sequester endogenous metastable proteins as well as components of the proteostasis network (PN) and thereby exacerbate protein misfolding in the cell. There are a limited number of tools available to assess the aggregation process of amyloid proteins within an animal. We present a protocol for fluorescence lifetime microscopy (FLIM) that allows monitoring as well as quantification of the amyloid fibrilization in specific cells, such as neurons, in a noninvasive manner and with the progression of aging and upon perturbation of the PN. FLIM is independent of the expression levels of the fluorophore and enables an analysis of the aggregation process without any further staining or bleaching. Fluorophores are quenched when they are in close vicinity of amyloid structures, which results in a decrease of the fluorescence lifetime. The quenching directly correlates with the aggregation of the amyloid protein. FLIM is a versatile technique that can be applied to compare the fibrilization process of different amyloid proteins, environmental stimuli, or genetic backgrounds in vivo in a non-invasive manner.

Characterization of Amyloid Structures in Aging C. Elegans Using Fluorescence Lifetime Imaging

Fluorescence lifetime imaging monitors, quantifies and distinguishes the aggregation tendencies of proteins in living, aging, and stressed C. elegans disease models.

使用荧光寿命成像在老化C.Elegans中淀粉样蛋白结构的表征

Amyloid fibrils are associated with a number of neurodegenerative diseases such as Huntington&#39;s, Parkinson&#39;s, or Alzheimer&#39;s disease. These ...

科研

生物化学

Monitoring Protein Aggregation Kinetics In Vivo using Automated Inclusion Counting in Caenorhabditis elegans

Protein aggregation into insoluble inclusions is a hallmark of a variety of human diseases, many of which are age-related. The nematode Caenorhabditis elegans is a well-established model organism that has been widely used in the field to study protein aggregation and toxicity. Its optical transparency enables the direct visualization of protein aggregation by fluorescence microscopy. Moreover, the fast reproductive cycle and short lifespan make the nematode a suitable model to screen for genes and molecules that modulate this process.
However, the quantification of aggregate load in living animals is poorly standardized, typically performed by manual inclusion counting under a fluorescence dissection microscope at a single time point. This approach can result in high variability between observers and limits the understanding of the aggregation process. In contrast, amyloid-like protein aggregation in vitro is routinely monitored by thioflavin T fluorescence in a highly quantitative and time-resolved fashion.
Here, an analogous method is presented for the unbiased analysis of aggregation kinetics in living C. elegans, using a high-throughput confocal microscope combined with custom-made image analysis and data fitting. The applicability of this method is demonstrated by monitoring inclusion formation of a fluorescently labeled polyglutamine (polyQ) protein in the body wall muscle cells. The image analysis workflow allows the determination of the numbers of inclusions at different timepoints, which are fitted to a mathematical model based on independent nucleation events in individual muscle cells. The method described here may prove useful to assess the effects of proteostasis factors and potential therapeutics for protein aggregation diseases in a living animal in a robust and quantitative manner.

Monitoring Protein Aggregation Kinetics In Vivo using Automated Inclusion Counting in Caenorhabditis elegans

Here, a method is presented for the analysis of protein aggregation kinetics in the nematode Caenorhabditis elegans. Animals from an age-synchronized population are imaged at different time points, followed by semiautomated inclusion counting in CellProfiler and fitting to a mathematical model in AmyloFit.

使用秀丽隐杆线虫中的自动包涵体计数监测体内蛋白质聚集动力学

Protein aggregation into insoluble inclusions is a hallmark of a variety of human diseases, many of which are age-related. The nematode Caenorhabditis ...

Automated Behavioral Analysis of Large C. elegans Populations Using a Wide Field-of-view Tracking Platform

Caenorhabditis elegans is a well-established animal model in biomedical research, widely employed in functional genomics and ageing studies. To assess the health and fitness of the animals under study, one typically relies on motility readouts, such as the measurement of the number of body bends or the speed of movement. These measurements usually involve manual counting, making it challenging to obtain good statistical significance, as time and labor constraints often limit the number of animals in each experiment to 25 or less. Since high statistical power is necessary to obtain reproducible results and limit false positive and negative results when weak phenotypic effects are investigated, efforts have recently been made to develop automated protocols focused on increasing the sensitivity of motility detection and multi-parametric behavioral profiling. In order to extend the limit of detection to the level needed to capture the small phenotypic changes that are often crucial in genetic studies and drug discovery, we describe here a technological development that enables the study of up to 5,000 individual animals simultaneously, increasing the statistical power of the measurements by about 1,000-fold compared to manual assays and about 100-fold compared to other available automated methods.

Automated Behavioral Analysis of Large C. elegans Populations Using a Wide Field-of-view Tracking Platform

We describe protocols for using the wide field-of-view nematode tracking platform (WF-NTP), which enables high-throughput phenotypic characterization of large populations of Caenorhabditis elegans. These protocols can be used to characterize subtle behavioral changes in mutant strains or in response to pharmacological treatment in a highly scalable fashion.

利用广域跟踪平台对大型线虫种群进行自动行为分析

Caenorhabditis elegans is a well-established animal model in biomedical research, widely employed in functional genomics and ageing studies. To assess the ...

免疫与感染

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

The folding and assembly of proteins is essential for protein function, the long-term health of the cell, and longevity of the organism. Historically, the function and regulation of protein folding was studied in vitro, in isolated tissue culture cells and in unicellular organisms. Recent studies have uncovered links between protein homeostasis (proteostasis), metabolism, development, aging, and temperature-sensing. These findings have led to the development of new tools for monitoring protein folding in the model metazoan organism Caenorhabditis elegans. In our laboratory, we combine behavioral assays, imaging and biochemical approaches using temperature-sensitive or naturally occurring metastable proteins as sensors of the folding environment to monitor protein misfolding. Behavioral assays that are associated with the misfolding of a specific protein provide a simple and powerful readout for protein folding, allowing for the fast screening of genes and conditions that modulate folding. Likewise, such misfolding can be associated with protein mislocalization in the cell. Monitoring protein localization can, therefore, highlight changes in cellular folding capacity occurring in different tissues, at various stages of development and in the face of changing conditions. Finally, using biochemical tools ex vivo, we can directly monitor protein stability and conformation. Thus, by combining behavioral assays, imaging and biochemical techniques, we are able to monitor protein misfolding at the resolution of the organism, the cell, and the protein, respectively.

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

To study the relationship between protein homeostasis, stress and aging, we monitored changes in protein folding by following protein dysfunction, protein localization in the cell and protein stability at the organismal, cellular and protein levels, using the genetically tractable metazoan Caenorhabditis elegans as a model system.

The folding and assembly of proteins is essential for protein function, the long-term health of the cell, and longevity of the organism. Historically, the ...

生物学

Caenorhabditis elegans as a Model System for Discovering Bioactive Compounds Against Polyglutamine-Mediated Neurotoxicity

Age-related misfolding and aggregation of pathogenic proteins are responsible for several neurodegenerative diseases. For example, Huntington&#39;s disease (HD) is principally driven by a CAG nucleotide repeat that encodes an expanded glutamine tract in huntingtin protein. Thus, the inhibition of polyglutamine (polyQ) aggregation and, in particular, aggregation-associated neurotoxicity is a useful strategy for the prevention of HD and other polyQ-associated conditions. This paper introduces generalized experimental protocols to assess the neuroprotective capacity of test compounds against HD using established polyQ transgenic Caenorhabditis elegans models. The AM141 strain is chosen for the polyQ aggregation assay as an age-associated phenotype of discrete fluorescent aggregates can be easily observed in its body wall at the adult stage due to muscle-specific expression of polyQ::YFP fusion proteins. In contrast, the HA759 model with strong expression of polyQ-expanded tracts in ASH neurons is used to examine neuronal death and chemoavoidance behavior. To comprehensively evaluate the neuroprotective capacity of target compounds, the above test results are ultimately presented as a radar chart with profiling of multiple phenotypes in a manner of direct comparison and direct viewing.

Caenorhabditis elegans as a Model System for Discovering Bioactive Compounds Against Polyglutamine-Mediated Neurotoxicity

Here, we present a protocol to assess the neuroprotective activities of test compounds in Caenorhabditis elegans, including polyglutamine aggregation, neuronal death, and chemoavoidance behavior, as well as an exemplary integration of multiple phenotypes.

秀丽隐杆线虫 作为发现生物活性化合物对抗聚谷氨酰胺介导的神经毒性的模型系统

Age-related misfolding and aggregation of pathogenic proteins are responsible for several neurodegenerative diseases. For example, Huntington&#39;s ...

神经科学

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

The ability to maintain proper function and folding of the proteome (protein homeostasis) declines during normal aging, facilitating the onset of a growing number of age-associated diseases. For instance, proteins with polyglutamine expansions are prone to aggregation, as exemplified with the huntingtin protein and concomitant onset of Huntington&#8217;s disease. The age-associated deterioration of the proteome has been widely studied through the use of transgenic Caenorhabditis elegans expressing polyQ repeats fused to a yellow fluorescent protein (YFP). This polyQ::YFP transgenic animal model facilitates the direct quantification of the age-associated decline of the proteome through imaging the progressive formation of fluorescent foci (i.e., protein aggregates) and subsequent onset of locomotion defects that develop as a result of the collapse of the proteome. Further, the expression of the polyQ::YFP transgene can be driven by tissue-specific promoters, allowing the assessment of proteostasis across tissues in the context of an intact multicellular organism. This model is highly amenable to genetic analysis, thus providing an approach to quantify aging that is complementary to lifespan assays. We describe how to accurately measure polyQ::YFP foci formation within either neurons or body wall muscle during aging, and the subsequent onset of behavioral defects. Next, we highlight how these approaches can be adapted for higher throughput, and potential future applications using other emerging strategies for C. elegans genetic analysis.

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Proteostatic decline is a hallmark of aging, facilitating the onset of neurodegenerative diseases. We outline a protocol to quantifiably measure proteostasis in two different Caenorhabditis elegans tissues through heterologous expression of polyglutamine repeats fused to a fluorescent reporter. This model allows rapid in vivo genetic analysis of proteostasis.

量化秀丽隐杆线虫中组织特异性蛋白静剂下降

The ability to maintain proper function and folding of the proteome (protein homeostasis) declines during normal aging, facilitating the onset of a ...

Modeling Age-Associated Neurodegenerative Diseases in Caenorhabditis elegans

Battling human neurodegenerative pathologies and managing their pervasive socioeconomic impact is becoming a global priority. Notwithstanding their detrimental effects on the human life quality and the healthcare system, the majority of human neurodegenerative disorders still remain incurable and non-preventable. Therefore, the development of novel therapeutic interventions against such maladies is becoming a pressing urgency. Age-associated deterioration of neuronal circuits and function is evolutionarily conserved in organisms as diverse as the lowly worm Caenorhabditis elegans and humans, signifying similarities in the underlying cellular and molecular mechanisms. C. elegans is a highly malleable genetic model, which offers a well-characterized nervous system, body transparency and a diverse repertoire of genetic and imaging techniques to assess neuronal activity and quality control during ageing. Here, we introduce and describe methodologies utilizing some versatile nematode models, including hyperactivated ion channel-induced necrosis (e.g., deg-3(d) and mec-4(d)) and protein aggregate (e.g., &#945;-syunclein and poly-glutamate)-induced neurotoxicity, to monitor and dissect the cellular and molecular underpinnings of age-related neuronal breakdown. A combination of these animal neurodegeneration models, together with genetic and pharmacological screens for cell death modulators will lead to an unprecedented understanding of age-related breakdown of neuronal function and will provide critical insights with broad relevance to human health and quality of life.

Modeling Age-Associated Neurodegenerative Diseases in Caenorhabditis elegans

Here, we introduce and describe widely accessible methodologies utilizing some versatile nematode models, including hyperactivated ion channel-induced necrosis and protein aggregate-induced neurotoxicity, to monitor and dissect the cellular and molecular underpinnings of age-associated neurodegenerative diseases.

建模年龄相关的神经退行性疾病在 卡诺哈布迪蒂斯埃利根

Battling human neurodegenerative pathologies and managing their pervasive socioeconomic impact is becoming a global priority. Notwithstanding their ...

Assessment of de novo Protein Synthesis Rates in Caenorhabditis elegans

Maintaining a healthy proteome is essential for cell and organismal homeostasis. Perturbation of the balance between protein translational control and degradation instigates a multitude of age-related diseases. Decline of proteostasis quality control mechanisms is a hallmark of ageing. Biochemical methods to detect de novo protein synthesis are still limited, have several disadvantages and cannot be performed in live cells or animals. Caenorhabditis elegans, being transparent and easily genetically modified, is an excellent model to monitor protein synthesis rates by using imaging techniques. Here, we introduce and describe a method to measure de novo protein synthesis in vivo utilizing fluorescence recovery after photobleaching (FRAP). Transgenic animals expressing fluorescent proteins in specific cells or tissues are irradiated by a powerful light source resulting in fluorescence photobleaching. In turn, assessment of fluorescence recovery signifies new protein synthesis in cells and/or tissues of interest. Hence, the combination of transgenic nematodes, genetic and/or pharmacological interventions together with live imaging of protein synthesis rates can shed light on mechanisms mediating age-dependent proteostasis collapse.

Assessment of de novo Protein Synthesis Rates in Caenorhabditis elegans

Here, we introduce and describe a nonradioactive and noninvasive method to assess de novo protein synthesis in vivo, utilizing the nematode Caenorhabditis elegans and fluorescence recovery after photobleaching (FRAP). This method can be combined with genetic and/or pharmacological screens to identify novel modulators of protein synthesis.

卡诺哈布迪蒂斯 伊利根斯新蛋白合成率评估

Maintaining a healthy proteome is essential for cell and organismal homeostasis. Perturbation of the balance between protein translational control and ...

Quantification of Insoluble Protein Aggregation in Caenorhabditis elegans during Aging with a Novel Data-Independent Acquisition Workflow

We and others have shown that the aging process results in a proteome-wide accumulation of insoluble proteins. Knocking down genes encoding the insoluble proteins over 40% of the time results in an extension of the lifespan in C. elegans, suggesting that many of these proteins are key determinants of the aging process. Isolation and quantitative identification of these insoluble proteins are crucial to understand key biological processes that occur during aging. Here, we present a modified and improved protocol that details how to extract and isolate the SDS-insoluble proteins (insolublome) from C. elegans more efficiently to streamline mass spectrometric workflows via a novel label-free quantitative proteomics analysis. This improved protocol utilizes a highly efficient sonicator for worm lysis that greatly increases efficiency for protein extraction and allows us to use significantly less starting material (approximately 3,000 worms) than in previous protocols (typically using at least 40,000 worms). Subsequent quantitative proteomic analysis of the insolublome was performed using data-dependent acquisition (DDA) for protein discovery and identification and data-independent acquisition (DIA) for comprehensive and more accurate protein quantification. Bioinformatic analysis of quantified proteins provides potential candidates that can be easily followed up with other molecular methods in C. elegans. With this workflow, we routinely identify more than 1000 proteins and quantify more than 500 proteins. This new protocol enables efficient compound screening with C. elegans. Here, we validated and applied this improved protocol to wild-type C. elegans N2-Bristol strain and confirmed that aged day-10 N2 worms showed greater accumulation of the insolublome than day-2 young worms.

Quantification of Insoluble Protein Aggregation in Caenorhabditis elegans during Aging with a Novel Data-Independent Acquisition Workflow

This novel workflow efficiently extracts and isolates SDS-insoluble proteins (insolublome) from Caenorhabditis elegans with minimal starting material for quantitative differential proteomic analysis. The protocol uses a comprehensive data-independent acquisition mass spectrometry analysis to quantify the insolublome and bioinformatic analysis to gain biological insights into aging mechanisms and pathologies.

We and others have shown that the aging process results in a proteome-wide accumulation of insoluble proteins. Knocking down genes encoding the insoluble ...

Automating Aggregate Quantification in Caenorhabditis elegans

A rise in the prevalence of neurodegenerative protein conformational diseases (PCDs) has fostered a great interest in this subject over the years. This increased attention has called for the diversification and improvement of animal models capable of reproducing disease phenotypes observed in humans with PCDs. Though murine models have proven invaluable, they are expensive and are associated with laborious, low-throughput methods. Use of the Caenorhabditis elegans nematode model to study PCDs has been justified by its relative ease of maintenance, low cost, and rapid generation time, which allow for high-throughput applications. Additionally, high conservation between the C. elegans and human genomes makes this model an invaluable discovery tool. Nematodes that express fluorescently tagged tissue-specific polyglutamine (polyQ) tracts exhibit age- and polyQ length-dependent aggregation characterized by fluorescent foci. Such reporters are often employed as proxies to monitor changes in proteostasis across tissues. Manual aggregate quantification is time-consuming, limiting experimental throughput. Furthermore, manual foci quantification can introduce bias, as aggregate identification can be highly subjective. Herein, a protocol consisting of worm culturing, image acquisition, and data processing was standardized to support high-throughput aggregate quantification using C. elegans that express intestine-specific polyQ. By implementing a C. elegans-based image processing pipeline using CellProfiler, an image analysis software, this method has been optimized to separate and identify individual worms and enumerate their respective aggregates. Though the concept of automation is not entirely unique, the need to standardize such procedures for reproducibility, elimination of bias from manual counting, and increase throughput is high. It is anticipated that these methods can drastically simplify the screening process of large bacterial, genomic, or drug libraries using the C. elegans model.

Automating Aggregate Quantification in Caenorhabditis elegans

The following protocol describes the development and optimization of a high-throughput workflow for worm culturing, fluorescence imaging, and automated image processing to quantify polyglutamine aggregates as an assessment of changes in proteostasis.

自动化秀丽隐杆线虫的聚集定量

A rise in the prevalence of neurodegenerative protein conformational diseases (PCDs) has fostered a great interest in this subject over the years. This ...

方法研究线虫线虫中固有的蛋白质聚集与年龄的变化

摘要

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此视频中的章节

使用荧光寿命成像在老化C.Elegans中淀粉样蛋白结构的表征

使用秀丽隐杆线虫中的自动包涵体计数监测体内蛋白质聚集动力学

利用广域跟踪平台对大型线虫种群进行自动行为分析

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

秀丽隐杆线虫作为发现生物活性化合物对抗聚谷氨酰胺介导的神经毒性的模型系统

量化秀丽隐杆线虫中组织特异性蛋白静剂下降

建模年龄相关的神经退行性疾病在卡诺哈布迪蒂斯埃利根

卡诺哈布迪蒂斯伊利根斯新蛋白合成率评估

Quantification of Insoluble Protein Aggregation in Caenorhabditis elegans during Aging with a Novel Data-Independent Acquisition Workflow

自动化秀丽隐杆线虫的聚集定量

方法研究线虫线虫中固有的蛋白质聚集与年龄的变化

摘要

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使用荧光寿命成像在老化C.Elegans中淀粉样蛋白结构的表征

使用秀丽隐杆线虫中的自动包涵体计数监测体内蛋白质聚集动力学

利用广域跟踪平台对大型线虫种群进行自动行为分析

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

秀丽隐杆线虫 作为发现生物活性化合物对抗聚谷氨酰胺介导的神经毒性的模型系统

量化秀丽隐杆线虫中组织特异性蛋白静剂下降

建模年龄相关的神经退行性疾病在 卡诺哈布迪蒂斯埃利根

卡诺哈布迪蒂斯 伊利根斯新蛋白合成率评估

Quantification of Insoluble Protein Aggregation in Caenorhabditis elegans during Aging with a Novel Data-Independent Acquisition Workflow

自动化秀丽隐杆线虫的聚集定量

秀丽隐杆线虫作为发现生物活性化合物对抗聚谷氨酰胺介导的神经毒性的模型系统

建模年龄相关的神经退行性疾病在卡诺哈布迪蒂斯埃利根

卡诺哈布迪蒂斯伊利根斯新蛋白合成率评估