We thank Cindy Voisine and Yoko Shibata for helpful discussion and critical comments on the manuscript. We acknowledge the High Throughput Analysis Laboratory (HTAL) and the Biological Imaging Facility (BIF) at Northwestern University for their assistance. This work was funded by grants from the National Institutes of Health (NIGMS, NIA, NINDS), the Ellison Medical Foundation, and the Daniel F. and Ada L. Rice Foundation (to R.I.M.). C.I.N.-K. was supported by the Deutsche Forschungsgemeinschaft (KR 3726/1-1).

The authors declare no competing financial interests.

השיטות שתוארו כאן לעזור כדי להמחיש מתפשטים ורעילות אוטונומית תא התא המורכב אוטונומית ולא של חלבונים כמו פריון. לאחרונה גילינו שתחום פריון cytosolic צבירה מועדת הוא נלקח לתוך שלפוחית ​​קרום הנכנס בתהליך autophagy קשור. תת-קבוצה מסוימת של שלפוחית ​​אלה משלוחי תחום הפריון בת...

מחלות רבות ניווניות, כוללים מחלת אלצהיימר, מחלת פרקינסון (PD) (AD), טרשת לרוחב amyotrophic (ALS), וencephalopathies transmissible spongiform (TSEs), המשויכות חלבוני צבירה מועדת ומכאן ידועות קולקטיבי חלבון misfolding הפרעות (PMDs ). TSEs או מחלות פריון מהוות מעמד ייחודי של PMDs בכך שהם יכולים להיות זיהומיות, באדם ובעלי החיים 1. ברמה המולקולרית, פריונים לשכפל על ידי גיוס והמרת PRP monomeric α-helix-עשיר בקידוד המארח הסלולרי (PRP C) לקונפורמציה PRP Sc β גיליון העשיר פתולוגי 2,3. אגרגטים חלבון עצמי הפצת גם זוהו בפטריות, אשר חולקות מאפיינים חשובים עם פריונים יונקים 4,5. בנוסף, פריונים יונקים מסוגלים לנוע מתא אל תא ולהדביק תאים נאיביים 6,7. בעוד oth PMDsאה מ TSEs אינו מדבק, הם חולקים עיקרון פתוגניים משותף עם מחלות פריון 8,9. למרות שהחלבונים הקשורים לכל אחד מPMDs אינם קשורים במבנה או פונקציה, הם כל אגרגטים הטופס באמצעות תהליך התגבשות כמו שנקרא גרעיניים או זרע פילמור; יתר על כן זרעים חלבוניים לגדול על ידי גיוס isoforms המסיס 2,10,11. היעילות להפיץ עצמי משתנה in vivo, בהתאם למאפיינים הפנימיים של החלבון, אשר יחד עם גורמים סלולריים נוספים כגון מלווים מולקולריים סופו של דבר יקבעו את התעריפים של התגרענות כוללת, זריעה, פיצול והפצת 12-15. מכאן, שחייב להתקיים איזון עדין בין הגורמים הללו, המאפשר התפשטות יעילה של צבירת חלבון. זה עשוי גם להסביר מדוע רק חלק אגרגטים amyloidogenic נמל המאפיינים של פריון, ולכן לא כל PMDs הם מדבקים. נראים פריונים לייצג o &#39;מלמעלה מבצעים&#39;ספקטרום רחב של fa אגרגטים חלבוניים המשכפלים את עוצמה, מה שהופך אותם כלי רב עוצמה כדי ללמוד PMDs 8,13. מעניין לגלות שההרעלה כרוכה באגרגטים הקשורים למחלות לעתים קרובות יש מרכיב אוטונומי של תאים הלא 16,17. משמעות דבר היא כי הם משפיעים על תאים שכנים, שאינו מבטאים את הגן המתאים, בניגוד להשפעה אוטונומית תא בהחלט, מה שמרמז שרק תאים המבטאים את גן התערוכה פנוטיפ הספציפי. הדבר בא לידי הביטוי משכנע על ידי ביטוי רקמות ספציפיות או להפיל של החלבונים המתאימים במספר רב של דגמים של מחלות ניווניות 18-26. מנגנונים שונים הוצעו כבסיס לרעילות זו אינה תא אוטונומית בPMDs, כוללים אספקת חומרי מזון פחת, חוסר איזון באיתות עצבית, הפעלת יתר רעילה גלוטמט, וneuroinflammation 16,27,28. בנוסף, תנועה כמו פריון-אגרגטים צמודי מחלה בין תאי might לתרום להיבט זה 29,30. ראיות מצביעות על כך שהגדלת תכלילים חלבון אחרים מאשר פריונים יכולים לשדר מתא אל תא, שעשוי להסביר את מאפיין הפצה של פתולוגיה שנצפתה בPMDs רב 30-36. עם זאת, זה עדיין לא נקבע אם יש קשר סיבתי ברור בין תנועה בין תאית של חלבוני מחלה וההשפעה הרעילה על תאי שכנים. לכן, הבנה טובה יותר של המסלולים הסלולריים העומדים בבסיס שידור ורעילות אוטונומית שאינו תא תא אל התא היא הכרחית וחיונית לפיתוח תרופות חדשניות. עם זאת, היבטים רבים של פריון כמו גורמי הפצה וסלולריים המשפיעים על העברת תא אל התא של חלבוני misfolded בmetazoans אינם מובנה היטב, בפרט ברמת האורגניזם. יש נמטודות elegans Caenorhabditis מספר יתרונות המספקים פוטנציאל ל לגלות היבטים חדשים של spreadi כמו פריון-ng בmetazoans 17. זה שקוף, המאפשר למעקב in vivo חלבונים של מתויגים fluorescently באורגניזם החי. יתר על כן, תהליכים תאיים ופיסיולוגיים רבים במחלה נשמרים מתולעים לאדם, ו- C. elegans הוא גם נוח למגוון רחב של מניפולציות גנטיות וניתוחים מולקולריים וביוכימיים 37-39. בדיוק 959 תאים סומטיים מרכיבים את אנדרוגינוס המבוגר עם תכנית גוף פשוט כי עדיין יש כמה סוגי רקמות שונים, כולל שרירים, תאי עצב ומעי. לבסס מודל פריון חדש בג elegans, בחרנו להביע אקסוגני גלוטמין / -rich פריון NM תחום של חלבון פריון שמרי cytosolic Sup35 asparagine המאופיין היטב (Q / N), שכן אין חלבוני פריון אנדוגני ידועים בתולעים 4,40. פריונים שמרים כבר לא יסולא בפז בהבהרת מנגנונים בסיסיים של שכפול פריון 41-44. יתר על כן, NM הוא האשוחחלבון st cytosolic כמו פריון-שהוכח לשחזר את מחזור החיים המלא של פריון בתרבית תאי יונקים 45,46. כמו כן, כאשר באו לידי ביטוי בג elegans, תחום פריון Sup35 אימץ להפליא לדרישות השונות לריבוי בתאים מטזואניים בהשוואה לתאי שמרים ותכונות עיקריות הציגו ביולוגיה פריון צבירת 40. NM הייתה קשורה עם פנוטיפ רעיל עמוק, כוללים השיבוש של יושרה ומראה של המיטוכונדריה שלפוחית ​​שונות הקשורים autophagy ברמה התאית, כמו גם מעצר עוברי וזחל, עיכוב התפתחותי, והפרעה נרחבת של סביבת קיפול חלבונים ברמת האורגניזם. באופן מפתיע, תחום הפריון מציג רעילות אוטונומית תא תא אוטונומי ובלתי, המשפיע על רקמות השכנות, שבי transgene לא באו לידי ביטוי. יתר על כן, תחבורת לפוחי של תחום הפריון בתוך ובין התאים היא פיקוח בזמן אמת &lt;em&gt; In vivo 40. כאן אנו מתארים כיצד לבחון הפצה כמו פריון-בג elegans. אנו נסביר כיצד לפקח על תחבורת התוך ובין תאית של שלפוחית ​​המכילה תחום הפריון באמצעות מיקרוסקופ פלואורסצנטי הזמן לשגות. אנו להדגיש את השימוש בחיישני קיפול רקמות ספציפיות וכל מקום בגוף הביעו כתבי לחץ כדי לבדוק את השפעות תא אוטונומיות ובלתי תא אוטונומיות על כושר סלולארי. לבסוף, נתאר את ההליך של מסך הגנום ביצע לאחרונה רחב התערבות RNA (RNAi) לזהות מכפילי חדשים של רעילות עקב פריון. בשילוב, שיטות אלה יכולים לעזור ללהפריד מסלולים גנטיים מעורבים בתנועה בין תאית של חלבונים והרעילות האוטונומית מסוג התאים לא.

<table border="0" cellpadding="0" cellspacing="0" width="665">
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			<td height="21" style="height:21px;width:211px;">Reagent</td>
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			<td height="21" style="height:21px;width:211px;">Nanosphere size standards 100 nm</td>
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			<td height="51" style="height:51px;width:211px;">Ahringer RNAi library</td>
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			<td height="51" style="height:51px;width:211px;">Sorvall Legend XTR Refrigerated Centrifuge, 120VAC</td>
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			XTR_Refrigerated_Centrifuge_120 
			VAC/EW-17707-60</td>
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			<td height="34" style="height:34px;width:211px;">96 pin replicator&#160;</td>
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			04&#38;action=products&#38;contentid=1&#38; 
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			<td height="51" style="height:51px;width:211px;">ORCA-R2 C10600-10BDigital CCD camera</td>
			<td style="width:107px;">Hamamatsu</td>
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			<td style="width:255px;">http://www.hamamatsu.com/jp/en/community/life_science_camera/product/search/C10600-10B/index.html</td>
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			<td height="85" style="height:85px;width:211px;">Spinning Disc AF Confocal Microscope&#160;</td>
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			<td style="width:255px;">http://www.leica-microsystems.com/products/light-microscopes/life-science-research/fluorescence-microscopes/details/product/leica-sd-af/</td>
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			<td height="51" style="height:51px;width:211px;">Falcon 4M60 camera&#160;</td>
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			<td height="51" style="height:51px;width:211px;">MetaMorph Microscopy Automation &#38; Image Analysis Software</td>
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			<td style="width:255px;">http://www.moleculardevices.com/products/software/meta-imaging-series/metamorph.html</td>
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			<td height="34" style="height:34px;width:211px;">Hamamatsu SimplePCI Image Analysis Software</td>
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			<td style="width:255px;">http://meyerinst.com/imaging-software/hamamatsu/index.htm</td>
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			<td height="21" style="height:21px;width:211px;">ImageJ</td>
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			<td style="width:255px;">http://rsbweb.nih.gov/ij/download.html</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:211px;">wrMTrck plugin for ImageJ</td>
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			<td style="width:255px;">http://www.phage.dk/plugins/wrmtrck.html</td>
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			<td height="21" style="height:21px;width:211px;">C. elegans strains</td>
			<td style="width:107px;"></td>
			<td style="width:92px;"></td>
			<td style="width:255px;"></td>
		</tr>
		<tr height="51">
			<td height="51" style="height:51px;width:211px;">N2 (WT)</td>
			<td style="width:107px;">Caenorhabditis Genetics Center (CGC)</td>
			<td style="width:92px;"></td>
			<td style="width:255px;">http://www.cgc.cbs.umn.edu/strain.php?id=10570</td>
		</tr>
		<tr height="34">
			<td height="34" style="height:34px;width:211px;">AM815&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; rmIs323[myo-3p::sup35(r2e2)::rfp]</td>
			<td style="width:107px;">Morimoto lab</td>
			<td style="width:92px;"></td>
			<td style="width:255px;">available from our laboratory&#160;</td>
		</tr>
		<tr height="34">
			<td height="34" style="height:34px;width:211px;">See table 1 for a source for folding sensor and stress reporter strains</td>
			<td style="width:107px;"></td>
			<td style="width:92px;"></td>
			<td style="width:255px;"></td>
		</tr>
	</tbody>
</table>

investigating the spreading and toxicity of prion-like proteins using the metazoan model organism c. elegans

Prions are unconventional self-propagating proteinaceous particles, devoid of any coding nucleic acid. These proteinaceous seeds serve as templates for the conversion and replication of their benign cellular isoform. Accumulating evidence suggests that many protein aggregates can act as self-propagating templates and corrupt the folding of cognate proteins. Although aggregates can be functional under certain circumstances, this process often leads to the disruption of the cellular protein homeostasis (proteostasis), eventually leading to devastating diseases such as Alzheimer&#8217;s disease (AD), Parkinson&#8217;s disease (PD), Amyotrophic lateral sclerosis (ALS), or transmissible spongiform encephalopathies (TSEs). The exact mechanisms of prion propagation and cell-to-cell spreading of protein aggregates are still subjects of intense investigation. To further this knowledge, recently a new metazoan model in Caenorhabditis elegans, for expression of the prion domain of the cytosolic yeast prion protein Sup35 has been established. This prion model offers several advantages, as it allows direct monitoring of the fluorescently tagged prion domain in living animals and ease of genetic approaches. Described here are methods to study prion-like behavior of protein aggregates and to identify modifiers of prion-induced toxicity using C. elegans.

ניטור אינטר הפצה של חלבונים כמו פריון-ידי in vivo הדמיה הזמן לשגות המהונדס C. קווי elegans להביע תחום הפריון הם גם מתאימים במיוחד לניתוח של היבטים מסוימים של חלבונים כמו פריון-, למשל, העברת תא אל התא ורעילות א?...

Watch this Scientific Journal Video about Investigating the Spreading and Toxicity of Prion-like Proteins Using the Metazoan Model Organism C. elegans at JoVE.com

Investigating the Spreading and Toxicity of Prion-like Proteins Using the Metazoan Model Organism C. elegans

Prion-like propagation of protein aggregates has recently emerged as being implicated in many neurodegenerative diseases. The goal of this protocol is to describe, how to use the nematode C. elegans as a model system to monitor protein spreading and to investigate prion-like phenomena.

חוקר את החלבונים כמו פריון-הפצת ורעילות של שימוש במטזואניים דגם אורגניזם<em&gt; C. elegans</em

Prions are unconventional self-propagating proteinaceous particles, devoid of any coding nucleic acid. These proteinaceous seeds serve as templates for ...

investigating-spreading-toxicity-prion-like-proteins-using-metazoan

Research

JoVE Journal

Biology

Investigating the Spreading and Toxicity of Prion-like Proteins Using the Metazoan Model Organism C. elegans

15.7K Views.  Northwestern University. Prion-like propagation of protein aggregates has recently emerged as being implicated in many neurodegenerative diseases. The goal of this protocol is to describe, how to use the nematode C. elegans as a model system to monitor protein spreading and to investigate prion-like phenomena.

Video: Investigating the Spreading and Toxicity of Prion-like Proteins Using the Metazoan Model Organism C. elegans

Generation of Stable Transgenic C. elegans Using Microinjection

Transgenic Caenorhabditis elegans can be readily created via microinjection of a DNA plasmid solution into the gonad 1. The plasmid DNA rearranges to form extrachromosomal concatamers that are stably inherited, though not with the same efficiency as actual chromosomes 2. A gene of interest is co-injected with an obvious phenotypic marker, such as rol-6 or GFP, to allow selection of transgenic animals under a dissecting microscope. The exogenous gene may be expressed from its native promoter for cellular localization studies. Alternatively, the transgene can be driven by a different tissue-specific promoter to assess the role of the gene product in that particular cell or tissue. This technique efficiently drives gene expression in all tissues of C. elegans except for the germline or early embryo 3. Creation of transgenic animals is widely utilized for a range of experimental paradigms. This video demonstrates the microinjection procedure to generate transgenic worms. Furthermore, selection and maintenance of stable transgenic C. elegans lines is described.

This video demonstrates the technique of microinjection into the gonad of C. elegans to create transgenic animals.

הדור של Stable טראנסגנטי C. elegans שימוש Microinjection

Transgenic Caenorhabditis elegans can be readily created via microinjection of a DNA plasmid solution into the gonad 1.  The plasmid DNA rearranges to ...

Dissecting and Recording from The C. Elegans Neuromuscular Junction

Neurotransmission is the process by which neurons transfer information via chemical signals to their post-synaptic targets, on a rapid time scale. This complex process requires the coordinated activity of many pre- and post-synaptic proteins to ensure appropriate synaptic connectivity, conduction of electrical signals, targeting and priming of secretory vesicles, calcium sensing, vesicle fusion, localization and function of postsynaptic receptors and finally, recycling mechanisms. As neuroscientists it is our goal to elucidate which proteins function in each of these steps and understand their mechanisms of action. Electrophysiological recordings from synapses provide a quantifiable read out of the underlying electrical events that occur during synaptic transmission. By combining this technique with the powerful array of molecular and genetic tools available to manipulate synaptic proteins in C. elegans, we can analyze the resulting functional changes in synaptic transmission. 
The C. elegans NMJs formed between motor neurons and body wall muscles control locomotion, therefore, mutants with uncoordinated locomotory phenotypes (known as unc s) often perturb synaptic transmission at these synapses 1. Since unc mutants are maintained on a rich supply of a bacterial food source, they remain viable as long as they retain some pharyngeal pumping ability to ingest food. This, together with the fact that C. elegans exist as hermaphrodites, allows them to pass on mutant progeny without the need for elaborate mating behaviors. These attributes, coupled with our recent ability to record from the worms NMJs 2,3,7 make this an excellent model organism in which to address precisely how unc mutants impact neurotransmission. 
The dissection method involves immobilizing adult worms using a cyanoacrylic glue in order to make an incision in the worm cuticle exposing the NMJs. Since C. elegans adults are only 1 mm in length the dissection is performed with the use of a dissecting microscope and requires excellent hand-eye coordination. NMJ recordings are made by whole-cell voltage clamping individual body wall muscle cells and neurotransmitter release can be evoked using a variety of stimulation protocols including electrical stimulation, light-activated channel-rhodopsin-mediated depolarization 4 and hyperosmotic saline, all of which will be briefly described.

Application of electrophysiology to accessible synapses provides a quantifiable measure of synaptic activity, useful in analyzing synaptic mutants. This article describes a dissection method used to expose the neuromuscular junctions (NMJ) of Caenorhabditis elegans (C. elegans) and briefly discusses some of the uses to which this preparation can be applied.

הביתור, הקלטה מ צומת C. elegans Neuromuscular

Neurotransmission is the process by which neurons transfer information via chemical signals to their post-synaptic targets, on a rapid time scale.   This ...

The Production of C. elegans Transgenes via Recombineering with the galK Selectable Marker

The creation of transgenic animals is widely utilized in C. elegans research including the use of GFP fusion proteins to study the regulation and expression pattern of genes of interest or generation of tandem affinity purification (TAP) tagged versions of specific genes to facilitate their purification. Typically transgenes are generated by placing a promoter upstream of a GFP reporter gene or cDNA of interest, and this often produces a representative expression pattern. However, critical elements of gene regulation, such as control elements in the 3' untranslated region or alternative promoters, could be missed by this approach. Further only a single splice variant can be usually studied by this means. In contrast, the use of worm genomic DNA carried by fosmid DNA clones likely includes most if not all elements involved in gene regulation in vivo which permits the greater ability to capture the genuine expression pattern and timing. To facilitate the generation of transgenes using fosmid DNA, we describe an E. coli based recombineering procedure to insert GFP, a TAP-tag, or other sequences of interest into any location in the gene. The procedure uses the galK gene as the selection marker for both the positive and negative selection steps in recombineering which results in obtaining the desired modification with high efficiency. Further, plasmids containing the galK gene flanked by homology arms to commonly used GFP and TAP fusion genes are available which reduce the cost of oligos by 50% when generating a GFP or TAP fusion protein. These plasmids use the R6K replication origin which precludes the need for extensive PCR product purification. Finally, we also demonstrate a technique to integrate the unc-119 marker on to the fosmid backbone which allows the fosmid to be directly injected or bombarded into worms to generate transgenic animals. This video demonstrates the procedures involved in generating a transgene via recombineering using this method.

The Production of C. elegans Transgenes via Recombineering with the galK Selectable Marker

The ability to produce transgenes for Caenorhabditis elegans using genomic DNA carried by fosmids is particularly attractive as all of the native regulatory elements are retained. Described is a simple and robust procedure for the production of transgenes via recombineering with the galK selectable marker.

הייצור של ג elegans Transgenes דרך Recombineering עם GalK לבחירה מרקר

The creation of transgenic animals is widely utilized in C. elegans research including the use of GFP fusion proteins to study the regulation and ...

Creating Defined Gaseous Environments to Study the Effects of Hypoxia on C. elegans

Oxygen is essential for all metazoans to survive, with one known exception1. Decreased O2 availability (hypoxia) can arise during states of disease, normal development or changes in environmental conditions2-5. Understanding the cellular signaling pathways that are involved in the response to hypoxia could provide new insight into treatment strategies for diverse human pathologies, from stroke to cancer. This goal has been impeded, at least in part, by technical difficulties associated with controlled hypoxic exposure in genetically amenable model organisms.
The nematode Caenorhabditis elegans is ideally suited as a model organism for the study of hypoxic response, as it is easy to culture and genetically manipulate. Moreover, it is possible to study cellular responses to specific hypoxic O2 concentrations without confounding effects since C. elegans obtain O2 (and other gasses) by diffusion, as opposed to a facilitated respiratory system6. Factors known to be involved in the response to hypoxia are conserved in C. elegans. The actual response to hypoxia depends on the specific concentration of O2 that is available. In C. elegans, exposure to moderate hypoxia elicits a transcriptional response mediated largely by hif-1, the highly-conserved hypoxia-inducible transcription factor6-9. C .elegans embryos require hif-1 to survive in 5,000-20,000 ppm O27,10. Hypoxia is a general term for "less than normal O2". Normoxia (normal O2) can also be difficult to define. We generally consider room air, which is 210,000 ppm O2 to be normoxia. However, it has been shown that C. elegans has a behavioral preference for O2 concentrations from 5-12% (50,000-120,000 ppm O2)11. In larvae and adults, hif-1 acts to prevent hypoxia-induced diapause in 5,000 ppm O212. However, hif-1 does not play a role in the response to lower concentrations of O2 (anoxia, operational definition &lt;10 ppm O2)13. In anoxia, C. elegans enters into a reversible state of suspended animation in which all microscopically observable activity ceases10. The fact that different physiological responses occur in different conditions highlights the importance of having experimental control over the hypoxic concentration of O2.
Here, we present a method for the construction and implementation of environmental chambers that produce reliable and reproducible hypoxic conditions with defined concentrations of O2. The continual flow method ensures rapid equilibration of the chamber and increases the stability of the system. Additionally, the transparency and accessibility of the chambers allow for direct visualization of animals being exposed to hypoxia. We further demonstrate an effective method of harvesting C. elegans samples rapidly after exposure to hypoxia, which is necessary to observe many of the rapidly-reversed changes that occur in hypoxia10,14. This method provides a basic foundation that can be easily modified for individual laboratory needs, including different model systems and a variety of gasses.

Creating Defined Gaseous Environments to Study the Effects of Hypoxia on C. elegans

This paper details how to use continuous-flow hypoxia chambers to generate atmospheres with defined concentrations of O2 to understand biological responses to decreased O2. This system is easy to setup and maintain, and flexible enough to suit a wide range of O2 concentrations and model systems

יצירת סביבות גזיים מוגדרים כדי לחקור את ההשפעות של היפוקסיה על<em&gt; ג elegans</em

Oxygen is essential for all metazoans to survive, with one known exception1. Decreased O2 availability (hypoxia) can arise during states of disease, ...

Using RNA-mediated Interference Feeding Strategy to Screen for Genes Involved in Body Size Regulation in the Nematode C. elegans

Double-strand RNA-mediated interference (RNAi) is an effective strategy to knock down target gene expression1-3. It has been applied to many model systems including plants, invertebrates and vertebrates. There are various methods to achieve RNAi in vivo4,5. For example, the target gene may be transformed into an RNAi vector, and then either permanently or transiently transformed into cell lines or primary cells to achieve gene knockdown effects; alternatively synthesized double-strand oligonucleotides from specific target genes (RNAi oligos) may be transiently transformed into cell lines or primary cells to silence target genes; or synthesized double-strand RNA molecules may be microinjected into an organism. Since the nematode C. elegans uses bacteria as a food source, feeding the animals with bacteria expressing double-strand RNA against target genes provides a viable strategy6. Here we present an RNAi feeding method to score body size phenotype. Body size in C. elegans is regulated primarily by the TGF- &beta; - like ligand DBL-1, so this assay is appropriate for identification of TGF-&beta; signaling components7. We used different strains including two RNAi hypersensitive strains to repeat the RNAi feeding experiments. Our results showed that rrf-3 strain gave us the best expected RNAi phenotype. The method is easy to perform, reproducible, and easily quantified. Furthermore, our protocol minimizes the use of specialized equipment, so it is suitable for smaller laboratories or those at predominantly undergraduate institutions.

Using RNA-mediated Interference Feeding Strategy to Screen for Genes Involved in Body Size Regulation in the Nematode C. elegans

We demonstrate how to use the RNAi feeding technique to knock down target genes and score body size phenotype in C. elegans. This method could be used for a large scale screen to identify potential genetic components of interest, such as those involved in body size regulation by DBL-1/TGF-&beta; signaling.

באמצעות אסטרטגית האכלת התערבות RNA בתיווך למסך לגנים מעורבים בויסות משקל גוף בנמטודות<em&gt; ג elegans</em

Double-strand RNA-mediated interference (RNAi) is an effective strategy to knock down target gene expression1-3. It has been applied to many model systems ...

Antibody Staining in C. Elegans Using &quot;Freeze-Cracking&quot;

To stain C. elegans with antibodies, the relatively impermeable cuticle must be bypassed by chemical or mechanical methods. "Freeze-cracking" is one method used to physically pull the cuticle from nematodes by compressing nematodes between two adherent slides, freezing them, and pulling the slides apart. Freeze-cracking provides a simple and rapid way to gain access to the tissues without chemical treatment and can be used with a variety of fixatives. However, it leads to the loss of many of the specimens and the required compression mechanically distorts the sample. Practice is required to maximize recovery of samples with good morphology. Freeze-cracking can be optimized for specific fixation conditions, recovery of samples, or low non-specific staining, but not for all parameters at once. For antibodies that require very hard fixation conditions and tolerate the chemical treatments needed to chemically permeabilize the cuticle, treatment of intact nematodes in solution may be preferred. If the antibody requires a lighter fix or if the optimum fixation conditions are unknown, freeze-cracking provides a very useful way to rapidly assay the antibody and can yield specific subcellular and cellular localization information for the antigen of interest.

Antibody Staining in C. Elegans Using &quot;Freeze-Cracking&quot;

"Freeze-cracking," a method for exposing the inner tissues of the nematode C. elegans to antibodies for protein localization, is demonstrated.

נוגדן מכתים ב<em&gt; ג Elegans</em&gt; שימוש &quot;Freeze-פיצוח&quot;

To stain C.  elegans with antibodies, the relatively impermeable cuticle must be  bypassed by chemical or mechanical methods.  "Freeze-cracking" is one ...

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 ...

Measuring the Effects of Bacteria on C. Elegans Behavior Using an Egg Retention Assay

C. elegans egg-laying behavior is affected by environmental cues such as osmolarity1 and vibration2. In the total absence of food C. elegans also cease egg-laying and retain fertilized eggs in their uterus3. However, the effect of different sources of food, especially pathogenic bacteria and particularly Enterococcus faecalis, on egg-laying
	behavior is not well characterized. The egg-in-worm (EIW) assay is a useful tool to quantify the effects of different types of bacteria, in this case E. faecalis, on egg- laying behavior.
	
	EIW assays involve counting the number of eggs retained in the uterus of C. elegans4. The EIW assay involves bleaching staged, gravid adult C. elegans to remove the cuticle and separate the retained eggs from the animal. Prior to bleaching, worms are exposed to bacteria (or any type of environmental cue) for a fixed period of time. After bleaching, one is very easily able to count the number of eggs retained inside the uterus of the worms. In this assay, a quantifiable increase in egg retention after E. faecalis exposure can be easily measured. The EIW assay is a behavioral assay that may be used to screen for potentially pathogenic bacteria or the presence of environmental toxins. In addition, the EIW assay may be a tool to screen for drugs that affect neurotransmitter signaling since egg-laying behavior is modulated by neurotransmitters such as serotonin and acetylcholine5-9.

Measuring the Effects of Bacteria on C. Elegans Behavior Using an Egg Retention Assay

An egg-in-worm (EIW) assay is a useful method to quantify egg-laying behavior. Alterations in egg laying can be a behavioral response of the model organism Caenorhabditis elegans to potentially harmful environmental substances such as those produced by pathogenic bacteria.

מדידת ההשפעות של חיידקים על<em&gt; ג Elegans</em&gt; התנהגות באמצעות Assay שימור ביצה

C. elegans egg-laying behavior is  affected by environmental cues such as osmolarity1 and  vibration2. In the total absence of food C. elegans also cease ...

An Anoxia-starvation Model for Ischemia/Reperfusion in C. elegans

Protocols for anoxia/starvation in the genetic model organism C. elegans simulate ischemia/reperfusion. Worms are separated from bacterial food and placed under anoxia for 20 hr&#160;(simulated ischemia), and subsequently moved to a normal atmosphere with food (simulated reperfusion). This experimental paradigm results in increased death and neuronal damage, and techniques are presented to assess organism viability, alterations to the morphology of touch neuron processes, as well as touch sensitivity, which represents the behavioral output of neuronal function. Finally, a method for constructing hypoxic incubators using common kitchen storage containers is described. The addition of a mass flow control unit allows for alterations to be made to the gas mixture in the custom incubators, and a circulating water bath allows for both temperature control and makes it easy to identify leaks. This method provides a low cost alternative to commercially available units.

An Anoxia-starvation Model for Ischemia/Reperfusion in C. elegans

A protocol is described that uses anoxia/starvation in C. elegans to model ischemia/reperfusion. Functional outcomes include increased mortality, visible abnormalities in GFP-labeled neuronal processes, and impaired behavioral responses that require neuronal function.

דגם אנוקסיה רעב לאיסכמיה / reperfusion ב<em&gt; ג elegans</em

Protocols for anoxia/starvation in the genetic model organism C. elegans simulate ischemia/reperfusion. Worms are separated from bacterial food and placed ...

Capture Compound Mass Spectrometry - A Powerful Tool to Identify Novel c-di-GMP Effector Proteins

Considerable progress has been made during the last decade towards the identification and characterization of enzymes involved in the synthesis (diguanylate cyclases) and degradation (phosphodiesterases) of the second messenger c-di-GMP. In contrast, little information is available regarding the molecular mechanisms and cellular components through which this signaling molecule regulates a diverse range of cellular processes. Most of the known effector proteins belong to the PilZ family or are degenerated diguanylate cyclases or phosphodiesterases that have given up on catalysis and have adopted effector function. Thus, to better define the cellular c-di-GMP network in a wide range of bacteria experimental methods are required to identify and validate novel effectors for which reliable in silico predictions fail.
We have recently developed a novel Capture Compound Mass Spectrometry (CCMS) based technology as a powerful tool to biochemically identify and characterize c-di-GMP binding proteins. This technique has previously been reported to be applicable to a wide range of organisms1. Here we give a detailed description of the protocol that we utilize to probe such signaling components. As an example, we use Pseudomonas aeruginosa, an opportunistic pathogen in which c-di-GMP plays a critical role in virulence and biofilm control. CCMS identified 74% (38/51) of the known or predicted components of the c-di-GMP network. This study explains the CCMS procedure in detail, and establishes it as a powerful and versatile tool to identify novel components involved in small molecule signaling.

The ubiquitous second messenger c-di-GMP controls growth and behavior of many bacteria. We have developed a novel Capture Compound Mass Spectrometry based technology to biochemically identify and characterize c-di-GMP binding proteins in virtually any bacterial species.