والكتاب أود أن أنوه MICINN (PTA برنامج دعم مونتسيرات بورتا دي لا ريفا)، AGAUR (دكتوراه زمالة إلى Fontrodona لورا)، معهد دي السعود كارلوس الثالث (ميغيل سيرفيت برنامج دعم خوليان سيرون)، وماري كوري IRG، ISCIII وIDIBELL للحصول على تمويل المختبر.

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Biol. 56, 110-156 (1977).</li><li>Hobert, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neurogenesis+in+the+nematode+Caenorhabditis+elegans.">Neurogenesis in the nematode Caenorhabditis elegans.</a> WormBook. , 1-24 (2010).</li><li>Depuydt, G., Vanfleteren, J. R., Braeckman, B. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Protein+metabolism+and+lifespan+in+Caenorhabditis+elegans.">Protein metabolism and lifespan in Caenorhabditis elegans.</a> Adv. Exp. Med. Biol. 694, 81-107 (2010).</li><li>Jia, K., Levine, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autophagy+and+longevity:+lessons+from+C.+elegans.">Autophagy and longevity: lessons from C. elegans.</a> Adv. Exp. Med. Biol. 694, 47-60 (2010).</li><li>Joshi, P. M., Riddle, M. R., Djabrayan, N. J., Rothman, 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=Caenorhabditis+elegans+as+a+model+for+stem+cell+biology.">Caenorhabditis elegans as a model for stem cell biology.</a> Dev. Dyn. 239, 1539-1554 (2010).</li><li>Waters, K. A., Reinke, V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Extrinsic+and+intrinsic+control+of+germ+cell+proliferation+in+Caenorhabditis+elegans.">Extrinsic and intrinsic control of germ cell proliferation in Caenorhabditis elegans.</a> Mol. Reprod. Dev. 78, 151-160 (2011).</li><li>Stiernagle, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Maintenance+of+C.+elegans.">Maintenance of C. elegans.</a> Wormbook. , (2006).</li><li>Smith, E. D. <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+calorie-independent+life+span+extension+from+dietary+restriction+by+bacterial+deprivation+in+Caenorhabditis+elegans.">Age- and calorie-independent life span extension from dietary restriction by bacterial deprivation in Caenorhabditis elegans.</a> BMC Dev. Biol. 8, 49 (2008).</li><li>Olahova, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+redox-sensitive+peroxiredoxin+that+is+important+for+longevity+has+tissue-+and+stress-specific+roles+in+stress+resistance.">A redox-sensitive peroxiredoxin that is important for longevity has tissue- and stress-specific roles in stress resistance.</a> Proc. Natl. Acad. Sci. U.S.A. 105, 19839-19344 (2008).</li><li>Voisine, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identification+of+potential+therapeutic+drugs+for+huntington's+disease+using+Caenorhabditis+elegans.">Identification of potential therapeutic drugs for huntington's disease using Caenorhabditis elegans.</a> PLoS One. 2, e504 (2007).</li><li>Garigan, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genetic+analysis+of+tissue+aging+in+Caenorhabditis+elegans:+a+role+for+heat-shock+factor+and+bacterial+proliferation.">Genetic analysis of tissue aging in Caenorhabditis elegans: a role for heat-shock factor and bacterial proliferation.</a> Genetics. 161, 1101-1112 (2002).</li><li>Aceves, J., Erlij, D., Martinez-Maranon, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mechanism+of+the+paralysing+action+of+tetramisole+on+Ascaris+somatic+muscle.">The mechanism of the paralysing action of tetramisole on Ascaris somatic muscle.</a> Br. J. Pharmacol. 38, 602-607 (1970).</li><li>Shaham, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Methods+in+cell+biology.">Methods in cell biology.</a> Wormbook. , (2006).</li><li>Pepper, A. S., Killian, D. J., Hubbardm, E. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genetic+analysis+of+Caenorhabditis+elegans+glp-1+mutants+suggests+receptor+interaction+or+competition.">Genetic analysis of Caenorhabditis elegans glp-1 mutants suggests receptor interaction or competition.</a> Genetics. 163 (1), 115-132 (2003).</li><li>Morley, J. F., Brignull, H. R., Weyers, J. J., 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=The+threshold+for+polyglutamine-expansion+protein+aggregation+and+cellular+toxicity+is+dynamic+and+influenced+by+aging+in+Caenorhabditis+elegans.">The threshold for polyglutamine-expansion protein aggregation and cellular toxicity is dynamic and influenced by aging in Caenorhabditis elegans.</a> Proc. Natl. Acad. Sci. U.S.A. 99, 10417-10422 (2002).</li></ol>

ليس لدينا ما يكشف.

الديدان الخيطية التزامن وقد وصفت عدة حلول التبييض. حاولنا 5 وصفات مختلفة (الجدول الأول)، وبين أيدينا، فإنها لم تظهر فروق ذات دلالة في تزامن السكان دودة (الشكل 1). ومع ذلك، لم تجاربنا تبين أن المعلمات مثل درجة الحرار...

basic caenorhabditis elegans methods: synchronization and observation

بدأ البحث في البيولوجيا الجزيئية والتنموية للايليجانس Caenorhabditis الخيطية في أوائل السبعينات من قبل برينر سيدني، ومنذ ذلك الحين يستخدم على نطاق واسع بوصفه الكائن نموذج 1. C. ايليجانس تمتلك سمات أساسية مثل الشفافية والبساطة وباختصار دورة الحياة التي جعلت من نظام مناسب التجريبية للدراسات البيولوجية الأساسية لسنوات عديدة 2. الاكتشافات في هذا الخيطية لها آثار واسعة لأن العديد من العمليات الخلوية والجزيئية التي تتحكم في تطور الحيوان هي 3 حفظها تطوري. جيم دورة الحياة ايليجانس يمر في مرحلة جنينية، وأربع مراحل اليرقات قبل الحيوانات يبلغون سن الرشد. ولا يمكن للتنمية أن 2 إلى 4 أيام تبعا لدرجة الحرارة. ويمكن في كل مرحلة من المراحل يمكن ملاحظة الصفات المميزة عدة. معرفة سلالته خلية كاملة 4،5 جنبا إلى جنب مع annotat عميقايون من الجينوم تحويل هذه الديدان الخيطية الى نموذج عظيم في مجالات متنوعة مثل علم الأعصاب 6، 7،8 الشيخوخة، بيولوجيا الخلايا الجذعية (9) والبيولوجيا الجرثومية خط 10. ميزة إضافية أن يجعل C. ايليجانس نموذجا جذابا للعمل مع هو إمكانية الحصول على السكان من الديدان متزامنة في مرحلة معينة من خلال بروتوكول سهلة نسبيا. وأضاف أن سهولة صيانة ونشر هذه الدودة الخيطية إلى إمكانية تزامن توفير أداة قوية للحصول على كميات كبيرة من الديدان، والتي يمكن استخدامها لمجموعة واسعة من التجارب الصغيرة أو الإنتاجية العالية، مثل شاشات رني، ميكروأرس، التسلسل واسع، طخة مناعية أو في التهجين في الموقع، من بين آخرين. بسبب شفافيتها، C. ويمكن التمييز بين الهياكل ايليجانس تحت المجهر باستخدام المجهر التفاضلية على النقيض من التدخل، والمعروف أيضا MICROS Nomarskiنسخ. استخدام الحمض النووي الموثق فلوري، دابي (4 &#39;،6-diamidino-2-phenylindole)، على سبيل المثال، يمكن أن يؤدي إلى تحديد هوية محددة، وتوطين الخلايا الفردية، فضلا عن الهياكل التحت خلوية / العيوب المرتبطة بها.

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Basic Caenorhabditis elegans Methods: Synchronization and Observation

لسهولة صيانة والترويج لالخيطية<em&gt; C. ايليجانس</em&gt; تجعل من كائن نموذج للعمل مع لطيفة. إمكانية مزامنة الديدان يسمح للعمل مع كمية كبيرة من المواد الدراسية في هذه المرحلة التنموية نفسه، ما يسهل دراسة عملية واحدة خاصة في العديد من الحيوانات.

الأساسية<em&gt; Caenorhabditis ايليجانس</em&gt; طرق: التزامن والمراقبة

Research into the molecular and developmental biology of the nematode Caenorhabditis elegans was begun in the early seventies by Sydney Brenner and it has ...

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Basic Caenorhabditis elegans Methods: Synchronization and Observation

46.0K Views.  Bellvitge Institute for Biomedical Research. لسهولة صيانة والترويج لالخيطية C. ايليجانس تجعل من كائن نموذج للعمل مع لطيفة. إمكانية مزامنة الديدان يسمح للعمل مع كمية كبيرة من المواد الدراسية في هذه المرحلة التنموية نفسه، ما يسهل دراسة عملية واحدة خاصة في العديد من الحيوانات.

Video: Basic Caenorhabditis elegans Methods: Synchronization and Observation

Measuring Caenorhabditis elegans Life Span on Solid Media

Aging is a degenerative process characterized by a progressive deterioration of cellular components and organelles resulting in mortality. The nematode Caenorhabditis elegans has emerged as a principal model used to study the biology of aging. Because virtually every biological subsystem undergoes functional decline with increasing age, life span is the primary endpoint of interest when considering total rate of aging. In nematodes, life span is typically defined as the number of days an animal remains responsive to external stimuli. Nematodes can be propagated either in liquid media or on solid media in plates, and techniques have been developed for measuring life span under both conditions. Here we present a generalized protocol for measuring life span of nematodes maintained on solid nematode growth media and fed a diet of UV-killed bacteria. These procedures can easily be adapted to assay life span under various common conditions, including a diet consisting of live bacteria, dietary restriction, and RNA interference.

Measuring Caenorhabditis elegans Life Span on Solid Media

In this article we present a general protocol for measuring life span of nematodes maintained on solid media with UV-killed bacterial food.

قياس انواع معينة ايليجانس سبان الحياة على وسائل الاعلام الصلبة

Aging is a degenerative process characterized by a progressive deterioration of cellular components and organelles resulting in mortality. The nematode ...

Isolation and In vitro Activation of Caenorhabditis elegans Sperm

Males and hermaphrodites are the two naturally found sexual forms in the nematode C. elegans. The amoeboid sperm are produced by both males and hermaphrodites. In the earlier phase of gametogenesis, the germ cells of hermaphrodites differentiate into limited number of sperm - around 300 - and are stored in a small 'bag' called the spermatheca. Later on, hermaphrodites continually produce oocytes1. In contrast, males produce exclusively sperm throughout their adulthood. The males produce so much sperm that it accounts for &gt;50% of the total cells in a typical adult worm2. Therefore, isolating sperm from males is easier than from that of hermaphrodites.
Only a small proportion of males are naturally generated due to spontaneous non-disjunction of X chromosome3. Crossing hermaphrodites with males or more conveniently, the introduction of mutations to give rise to Him (High Incidence of Males) phenotype are some of strategies through which one can enrich the male population3.
Males can be easily distinguished from hermaphrodites by observing the tail morphology4. Hermaphrodite's tail is pointed, whereas male tail is rounded with mating structures.
Cutting the tail releases vast number of spermatids stored inside the male reproductive tract. Dissection is performed under a stereo microscope using 27 gauge needles. Since spermatids are not physically connected with any other cells, hydraulic pressure expels internal contents of male body, including spermatids2.
Males are directly dissected on a small drop of 'Sperm Medium'. Spermatids are sensitive to alteration in the pH. Hence, HEPES, a compound with good buffering capacity is used in sperm media. Glucose and other salts present in sperm media help maintain osmotic pressure to maintain the integrity of sperm.
Post-meiotic differentiation of spermatids into spermatozoa is termed spermiogenesis or sperm activation. Shakes5, and Nelson6 previously showed that round spermatids can be induced to differentiate into spermatozoa by adding various activating compounds including Pronase E. Here we demonstrate in vitro spermiogenesis of C. elegans spermatids using Pronase E.
Successful spermiogenesis is pre-requisite for fertility and hence the mutants defective in spermiogenesis are sterile. Hitherto several mutants have been shown to be defective specifically in spermiogenesis process7. Abnormality found during in vitro activation of novel Spe (Spermatogenesis defective) mutants would help us discover additional players participating in this event.

Isolation and In vitro Activation of Caenorhabditis elegans Sperm

A protocol for isolating and activating spermatids from male C. elegans is described here. Cutting the posterior end of male releases spermatids. The spermatids can be activated by addition of protease.

والعزلة في المختبر تفعيل انواع معينة ايليجانس الحيوانات المنوية

Males and hermaphrodites are the two naturally found sexual forms in the nematode C. elegans. The amoeboid sperm are produced by both males and ...

Prostaglandin Extraction and Analysis in Caenorhabditis elegans

Caenorhabditis elegans is emerging as a powerful animal model to study the biology of lipids1-9. Prostaglandins are an important class of eicosanoids, which are lipid signals derived from polyunsaturated fatty acids (PUFAs)10-14. These signalling molecules are difficult to study because of their low abundance and reactive nature. The characteristic feature of prostaglandins is a cyclopentane ring structure located within the fatty acid backbone. In mammals, prostaglandins can be formed through cyclooxygenase enzyme-dependent and -independent pathways10,15. C. elegans synthesizes a wide array of prostaglandins independent of cyclooxygenases6,16,17. A large class of F-series prostaglandins has been identified, but the study of eicosanoids is at an early stage with ample room for new discoveries. Here we describe a procedure for extracting and analyzing prostaglandins and other eicosanoids. Charged lipids are extracted from mass worm cultures using a liquid-liquid extraction technique and analyzed by liquid chromatography coupled to electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS). The inclusion of deuterated analogs of prostaglandins, such as PGF2 &alpha;-d4 as an internal standard is recommended for quantitative analysis. Multiple reaction monitoring or MRM can be used to quantify and compare specific prostaglandin types between wild-type and mutant animals. Collision-induced decomposition or MS/MS can be used to obtain information on important structural features. Liquid chromatography mass spectrometry (LC-MS) survey scans of a selected mass range, such as m/z 315-360 can be used to evaluate global changes in prostaglandin levels. We provide examples of all three analyses. These methods will provide researchers with a toolset for discovering novel eicosanoids and delineating their metabolic pathways.

Prostaglandin Extraction and Analysis in Caenorhabditis elegans

In this paper, we describe an optimized procedure for extracting and analyzing prostaglandins and other eicosanoids from C. elegans using LC-MS/MS.

استخراج البروستاجلاندين والتحليل في<em&gt; انواع معينة ايليجانس</em

Caenorhabditis elegans is emerging as a powerful animal model to study the biology of lipids1-9. Prostaglandins are an important class of eicosanoids, ...

Observation and Quantification of Telomere and Repetitive Sequences Using Fluorescence In Situ Hybridization (FISH) with PNA Probes in Caenorhabditis elegans

Telomere is a ribonucleoprotein structure that protects chromosomal ends from aberrant fusion and degradation. Telomere length is maintained by telomerase or an alternative pathway, known as alternative lengthening of telomeres (ALT)1. Recently, C. elegans has emerged as a multicellular model organism for the study of telomere and ALT2. Visualization of repetitive sequences in the genome is critical in understanding the biology of telomeres. While telomere length can be measured by telomere restriction fragment assay or quantitative PCR, these methods only provide the averaged telomere length. On the contrary, fluorescence in situ hybridization (FISH) can provide the information of the individual telomeres in cells. Here, we provide protocols and representative results of the method to determine telomere length of C. elegans by fluorescent in situ hybridization. This method provides a simple, but powerful, in situ procedure that does not cause noticeable damage to morphology. By using fluorescently labeled peptide nucleic acid (PNA) and digoxigenin-dUTP-labeled probe, we were able to visualize two different repetitive sequences: telomere repeats and template of ALT (TALT) in C. elegans embryos and gonads.

Observation and Quantification of Telomere and Repetitive Sequences Using Fluorescence In Situ Hybridization FISH with PNA Probes in Caenorhabditis elegans

We report a concise procedure of fluorescence in situ hybridization (FISH) in the gonad and embryos of Caenorhabditis elegans for observing and quantifying repetitive sequences. We successfully observed and quantified two different repetitive sequences, telomere repeats and template of alternative lengthening of telomeres (TALT).

المراقبة والكمي لالتيلومير وتسلسل المتكررة عن طريق الإسفار<em&gt; في الموقع</em&gt; التهجين (FISH) مع السلطة الوطنية الفلسطينية تحقيقات في<em&gt; انواع معينة ايليجانس</em

Telomere is a ribonucleoprotein structure that protects chromosomal ends from aberrant fusion and degradation. Telomere length is maintained by telomerase ...

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

In the last decades, the prevalence of neurodegenerative disorders, such as Alzheimer's disease (AD) and Parkinson's disease (PD), has grown. These age-associated disorders are characterized by the appearance of protein aggregates with fibrillary structure in the brains of these patients. Exactly why normally soluble proteins undergo an aggregation process remains poorly understood. The discovery that protein aggregation is not limited to disease processes and instead part of the normal aging process enables the study of the molecular and cellular mechanisms that regulate protein aggregation, without using ectopically expressed human disease-associated proteins. Here we describe methodologies to examine inherent protein aggregation in Caenorhabditis elegans through complementary approaches. First, we examine how to grow large numbers of age-synchronized C. elegans to obtain aged animals and we present the biochemical procedures to isolate highly-insoluble-large aggregates. In combination with a targeted genetic knockdown, it is possible to dissect the role of a gene of interest in promoting or preventing age-dependent protein aggregation by using either a comprehensive analysis with quantitative mass spectrometry or a candidate-based analysis with antibodies. These findings are then confirmed by in vivo analysis with transgenic animals expressing fluorescent-tagged aggregation-prone proteins. These methods should help clarify why certain proteins are prone to aggregate with age and ultimately how to keep these proteins fully functional.

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

The goal of the method presented here is to explore protein aggregation during normal aging in the model organism C. elegans. The protocol represents a powerful tool to study the highly insoluble large aggregates that form with age and to determine how changes in proteostasis impact protein aggregation.

أساليب "دراسة التغيرات" في "تجميع البروتين الأصيل" مع التقدم في السن في ايليجانس كاينورهابديتيس

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

Combined Nucleotide and Protein Extractions in Caenorhabditis elegans

A single biological sample holds a plethora of information, and it is now common practice to simultaneously investigate several macromolecules to capture a full picture of the multiple levels of molecular processing and changes between different conditions. This protocol presents the method of isolating DNA, RNA, and protein from the same sample of the nematode Caenorhabditis elegans to remove the variation introduced when these biomolecules are isolated from replicates of similarly treated but ultimately different samples. Nucleic acids and protein are extracted from the nematode using the acid guanidinium thiocyanate-phenol-chloroform extraction method, with subsequent precipitation, washing, and solubilization of each. We show the successful isolation of RNA, DNA, and protein from a single sample from three strains of nematode and HeLa cells, with better protein isolation results in adult animals. Additionally, guanidinium thiocyanate-phenol-chloroform-extracted protein from nematodes improves the resolution of larger proteins, with enhanced detectable levels as observed by immunoblotting, compared to the traditional RIPA extraction of protein.
The method presented here is useful when investigating samples using a multiomic approach, specifically for the exploration of the proteome and transcriptome. Techniques that simultaneously assess multiomics are appealing because molecular signaling underlying complex biological phenomena is thought to occur at complementary levels; however, it has become increasingly common to see that changes in mRNA levels do not always reflect the same change in protein levels and that the time of collection is relevant in the context of circadian regulations. This method removes any intersample variation when assaying different contents within the same sample (intrasample.)

Combined Nucleotide and Protein Extractions in Caenorhabditis elegans

Here, we present a protocol for the isolation of RNA, DNA, and protein from the same sample, in an effort to reduce variation, improve reproducibility, and facilitate interpretations.

الجمع بين النوكليوتيدات والاستخراج البروتين في ايليجانس كاينورهابديتيس

A single biological sample holds a plethora of information, and it is now common practice to simultaneously investigate several macromolecules to capture ...

Measurement of Oxygen Consumption Rates in Intact Caenorhabditis elegans

Optimal mitochondrial function is critical for healthy cellular activity, particularly in cells that have high energy demands like those in the nervous system and muscle. Consistent with this, mitochondrial dysfunction has been associated with a myriad of neurodegenerative diseases and aging in general. Caenorhabditis elegans have been a powerful model system for elucidating the many intricacies of mitochondrial function. Mitochondrial respiration is a strong indicator of mitochondrial function and recently developed respirometers offer a state-of-the-art platform to measure respiration in cells. In this protocol, we provide a technique to analyze live, intact C. elegans. This protocol spans a period of ~7 days and includes steps for (1) growing and synchronization of C. elegans, (2) preparation&#160;of compounds to be injected and hydration of probes, (3) drug loading and cartridge equilibration, (4) preparation of worm assay plate and assay run, and (5) post-experiment data analysis.

Measurement of Oxygen Consumption Rates in Intact Caenorhabditis elegans

Mitochondrial respiration is critical for organismal survival; therefore, oxygen consumption rate is an excellent indicator of mitochondrial health. In this protocol, we describe the use of a commercially available respirometer to measure basal and maximal oxygen consumption rates in live, intact, and freely-motile Caenorhabditis elegans.

قياس معدلات استهلاك الأوكسجين في سليمة ايليجانس كاينورهابديتيس

Optimal mitochondrial function is critical for healthy cellular activity, particularly in cells that have high energy demands like those in the nervous ...

Purification and Analysis of Caenorhabditis elegans Extracellular Vesicles

The secretion of small membrane-bound vesicles into the external environment is a fundamental physiological process of all cells. These extracellular vesicles (EVs) function outside the cell to regulate global physiological processes by transferring proteins, nucleic acids, metabolites, and lipids between tissues. EVs reflect the physiological state of their cells of origin. EVs are implicated to have fundamental roles in virtually every aspect of human health. Thus, EV protein and genetic cargos are being increasingly analyzed for biomarkers of health and disease. However, the EV field still lacks a tractable invertebrate model system that permits the study of EV cargo composition. C. elegans is well suited for EV research because it actively secretes EVs outside of its body into its external environment, permitting facile isolation. This article provides all the necessary information for generating, purifying, and quantifying these environmentally secreted C. elegans EVs including how to work quantitatively with very large populations of age-synchronized worms, purifying EVs, and a flow cytometry protocol that directly measures the number of intact EVs in the purified sample. Thus, the large library of genetic reagents available for C. elegans research can be tapped into for investigating the impacts of genetic pathways and physiological processes on EV cargo composition.

Purification and Analysis of Caenorhabditis elegans Extracellular Vesicles

This article presents methods for generating, purifying, and quantifying Caenorhabditis elegans extracellular vesicles.

تنقية وتحليل Caenorhabditis elegans خارج الخلية الحويصلات

The secretion of small membrane-bound vesicles into the external environment is a fundamental physiological process of all cells. These extracellular ...

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.

النمذجة العمر المرتبطة الأمراض العصبية في Caenorhabditis elegans

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.

تقييم معدلات تخليق البروتينات في Caenorhabditis elegans

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