עבודה זו נתמכה על ידי המכון הלאומי לHealthGrants DK85035 וDK074797 (IH).

<ol>
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המחברים מצהירים שאין אינטרסים כלכליים מתחרים או ניגוד העניינים.

בפרוטוקול זה אנו מציגים mCeHR הותאם axenic נוזל מדיה המאפשרת לג המהיר דור elegans עם ייצור של מספר רב של תולעים. מדיה זו מציגה מספר יתרונות כמו התולעים גדלים בלי לזהם E. coli או תוצרי לוואי וחיידקים יכול להיות מנוצלים במחקרים תזונתיים וטוקסיקולוגי. שימושו של ע &#39...

נמטודות הקרקע, elegans Caenorhabditis, הוא אורגניזם מודל רב עוצמה המשמש במחקרים רבים מתחום הגנטיקה לטוקסיקולוגיה. כתוצאה מגודלו 1 מ&quot;מ, זמן דור המהיר של ארבעה ימים, קל טיפוח, ומספרי צאצאים גדולים, נמטודות אלה כבר נוצלו במספר מסכי גנטיים תרופתיים 1, 2. חוקרים לנצל את תולעת זה כדי לזהות מולקולות ומסלולים נשמרים במערכות בעלי חוליות. מסלולים אלה כוללים אותות מוות של תאים, מסלולים של הזדקנות ואת חילוף חומרים, ואת מערכת העצבים 3-6. בנוסף, השקיפות של ג elegans מאפשר לדור של קווים מהונדסים באמצעות כתבי חלבון פלואורסצנטי, אשר ניתן דמיינו ישירות לנתח דפוסי ביטוי גנים ולוקליזציה חלבון. במחקרים רבים נמטודות זה תרבית על משטח המבוסס על אגר מוצק באמצעות מדיום גידול נמטודות צלחות (NGM) או בליטרתרבויות iquid זרע עם Escherichia coli כמקור מזון 7,8. מקורות מזון של חיידקים אלה יכולים לבלבל את מחקרים ביוכימיים ורעלים עם הפרעות מחיידקי תוצרי המשפיעים על הפרשנות של תוצאות. על מנת להימנע מתופעות הרכבה אלה, ג יכול להיות מתורבת elegans בתקשורת נוזלית axenic כי הוא נטול חיידקים כמקור מזון. שימוש בתקשורת זו, אנו תרבית בהצלחה מיליוני תולעים מסונכרנים היטב עבור רבים ג הסטנדרטי פרוטוקולי elegans כולל ניתוח microarray של גנים מוסדרים באופן דיפרנציאלי בג elegans נחשף לריכוזי heme שונים, וייצור של תולעים מהונדסים באמצעות הפגזת גן. מדיה זו הגדרה כימית ושונה ממתכון מקורי שגובש על ידי ד&quot;ר אריק קלג 9. השימוש במדים mCeHR זה, זיהינו בהצלחה את הגנים מעורבים בהומאוסטזיס heme, המכונה גנים כheme מגיבים (HRG ים) 10, שהייתלא היה אפשרי בתנאי גידול רגילים אשר מנצלים צלחות אגר NGM seeded עם א &#39; coli. בפרוטוקול זה אנו מתארים את ההליך להחדרה ושמירה על ג elegans גדל על E. coli לmCeHR axenic ולנצל בשיטה זו כדי לקבל מספר גדול של תולעים לייצור ג המהונדס קווי elegans באמצעות הפגזת microparticle. אנחנו גם לימודים הנוכחיים המציגים את התועלת של שימוש במדים axenic לקביעת הדרישה התזונתית של ג elegans באמצעות heme לדוגמא ירושלים. מחקרים אלה מראים כי השימוש במדים mCeHR מאפשר צמיחה מהירה של מספר גדול של ג elegans עבור יישומים במורד הזרם רבים מנוצלים על ידי חוקרי תולעת.

<table border="0" cellpadding="0" cellspacing="0" width="754">
	<tbody>
		<tr height="25">
			<td height="25" style="height:25px;width:359px;">MgCl2.6H2O</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">M-2393</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sodium citrate</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">S-4641</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Potassium citrate.H2O</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">P-1722</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">CuCl2.2H2O</td>
			<td style="width:108px;">Fisher</td>
			<td style="width:121px;">C455-500</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">MnCl2.4H2O</td>
			<td style="width:108px;">Fisher</td>
			<td style="width:121px;">M87-100</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">ZnCl2</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">Z-0152</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">Fe(NH4)2(SO4)2.6H2O</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">F-1018</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">CaCl2.2H2O</td>
			<td style="width:108px;">Fisher</td>
			<td style="width:121px;">C70-500</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Adenosine 5 -monophosphate, sodium salt</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">A-1752</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Cytidine 5 -phosphate</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">C-1006</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Guanosine 2 - and3&#160; -monophosphate</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">G-8002</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Uridine 5 -phosphate, disodium salt</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">U-6375</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Thymine&#160;</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">T0376</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">N-Acetylglucosamine</td>
			<td style="width:108px;">Sigma</td>
			<td>A3286</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">DL-Alanine</td>
			<td style="width:108px;">Fisher</td>
			<td>S25648&#160;</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">p-Aminobenzoic Acid</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">A-9878</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Biotin</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">B-4639</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Cyanocobalamine (B-12)</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">V-2876</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Folinate (Ca)&#160;</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">F-7878</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Niacin</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">N-0761</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Niacinamide</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">N-3376</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Pantetheine</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">P-2125</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Pantothenate (Ca)</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">P-6292</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Pteroylglutamic Acid (Folic Acid)</td>
			<td style="width:108px;">ACRCS</td>
			<td style="width:121px;">21663-0100</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Pyridoxal 5&#39;-phosphate</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">P-3657</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Pyridoxamine.2HCl</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">P-9158</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Pyridoxine.HCl</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">P-6280</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:359px;">Riboflavin 5-PO4(Na)</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">R-7774</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Thiamine.HCl</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">T-1270</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">DL-6,8-Thioctic Acid</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">T-1395</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:359px;">KH2PO4</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">P-5379</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Choline di-acid citrate</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">C-2004</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">myo-Inositol</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">I-5125</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">D-Glucose</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">G-7520</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Lactalbumin enzymatic hydrolysate</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">L-9010</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Brain Heart Infusion</td>
			<td style="width:108px;">BD</td>
			<td style="width:121px;">211065</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:359px;">Hemin chloride</td>
			<td style="width:108px;">Frontier Scientific</td>
			<td style="width:121px;">H651-9</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">HEPES, Na salt</td>
			<td style="width:108px;">Sigma</td>
			<td style="width:121px;">H-3784</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:359px;">Cholesterol</td>
			<td style="width:108px;">J.T. Baker</td>
			<td style="width:121px;">F676-05</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">MEM Non-Essential Amino Acids</td>
			<td style="width:108px;">Invitrogen</td>
			<td>11140-076</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">MEM Amino Acids Solution</td>
			<td style="width:108px;">Invitrogen</td>
			<td>11130-051</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Nalidixic acid sodium salt</td>
			<td style="width:108px;">Sigma</td>
			<td>N4382</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Tetracycline Hydrochloride</td>
			<td style="width:108px;">MP Biomedicals</td>
			<td>2194542</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Biolistic Delivery System</td>
			<td style="width:108px;">BioRad</td>
			<td>165-2257</td>
			<td></td>
		</tr>
		<tr height="84">
			<td height="84" style="height:84px;">Gold particles (Au Powder)&#160;</td>
			<td style="width:108px;">&#160;Ferro Electronic Material Systems</td>
			<td style="width:121px;">6420 2504, JZP01010KM</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:359px;">or</td>
			<td style="width:108px;"></td>
			<td style="width:121px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Gold Particles 1.0 &#956;m</td>
			<td style="width:108px;">BioRad</td>
			<td>&#160;165-2263</td>
			<td></td>
		</tr>
	</tbody>
</table>

culturing caenorhabditis elegans in axenic liquid media and creation of transgenic worms by microparticle bombardment

בפרוטוקול זה, אנו מציגים את החומרים דרושים, ואת ההליך להכנת C שונה. Legans דואר מדיה הרגלה והרבייה (mCeHR). בנוסף, הצעדים לחשיפה והתאקלמות ג elegans גדל על E. coli לaxenic תקשורת נוזלית מתוארים. לבסוף, ניסויים במורד הזרם לנצל ג axenic elegans להמחיש את היתרונות של הליך זה. היכולת לנתח ולקבוע ג הדרישה התזונתית elegans שהומחש על ידי גידול תולעים מסוג בר N2 בתקשורת נוזלית axenic עם ריכוזי heme שונים. הליך זה יכול להיות משוכפל עם חומרים מזינים אחרים כדי לקבוע את הריכוז האופטימלי לצמיחה והתפתחות או תולעת, כדי לקבוע את השפעות טוקסיקולוגי של טיפולים תרופתיים. ההשפעות של ריכוזי heme מגוונים על הצמיחה של תולעים מסוג בר נקבעו באמצעות תצפית מיקרוסקופית איכותית ועל ידי quantitating tהוא מספר התולעים שגדלו בכל ריכוז heme. בנוסף, ההשפעה של ריכוזים תזונתיים מגוונים ניתן assayed ידי ניצול תולעים המבטאים חיישני ניאון שמגיבים לשינויים בתזונתיים של עניין. יתרה מזאת, מספר גדול של תולעים יוצרו בקלות עבור הדור של elegans המהונדס ג באמצעות הפגזת microparticle.

Culturing ג elegans בעזרי axenic נוזל בינוניים בקביעה של חומרים מזינים הנדרשים על ידי תולעים, ללא הפרעה מצד מטבוליטים משניים המיוצרים על ידי א coli. תולעי wildtype N2 להתאקלם לתקשורת mCeHR בתוך שלושה דורות ולהציג צמיחה דומה לתולעים גדלו על צלחות חיידקי NGM. ואכן, התולעים אלה הופכ?...

Watch this Scientific Journal Video about Culturing Caenorhabditis elegans in Axenic Liquid Media and Creation of Transgenic Worms by Microparticle Bombardment at JoVE.com

Culturing Caenorhabditis elegans in Axenic Liquid Media and Creation of Transgenic Worms by Microparticle Bombardment

סי אלגנס בדרך כלל הוא גדל על צלחות אגר מוצקות או נוזליים בתרבויות זרע עם א &#39; coli. כדי למנוע תוצרי לוואי חיידקים מבלבול מחקרי טוקסיקולוגי ותזונתיים, אנו מנוצלים מדיום נוזלי axenic, CeHR, לגדול ולסנכרן מספר רב של תולעים עבור מגוון רחב של יישומים במורד הזרם.

Culturing<em&gt; Elegans Caenorhabditis</em &gt; בAxenic נוזלית מדיה ובריאה של תולעים מהונדסים ידי microparticle הפצצה

In this protocol, we present the required materials, and the procedure for making modified&#160;C. elegans&#160;Habituation and Reproduction media ...

culturing-caenorhabditis-elegans-axenic-liquid-media-creation

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Biology

Culturing Caenorhabditis elegans in Axenic Liquid Media and Creation of Transgenic Worms by Microparticle Bombardment

16.9K Views.  University of Maryland.  סי אלגנס בדרך כלל הוא גדל על צלחות אגר מוצקות או נוזליים בתרבויות זרע עם א ' coli. כדי למנוע תוצרי לוואי חיידקים מבלבול מחקרי טוקסיקולוגי ותזונתיים, אנו מנוצלים מדיום נוזלי axenic, CeHR, לגדול ולסנכרן מספר רב של תולעים עבור מגוון רחב של ?...

Video: Culturing Caenorhabditis elegans in Axenic Liquid Media and Creation of Transgenic Worms by Microparticle Bombardment

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.

מדידת Caenorhabditis elegans חיים טווח על מדיה מוצק

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

Generation of Transgenic C. elegans by Biolistic Transformation

The number of laboratories using the free living nematode C. elegans is rapidly growing. The popularity of this biological model is attributed to a rapid generation time and short life span, easy and inexpensive maintenance, fully sequenced genome, and array of RNAi resources and mutant animals. Additionally, analysis of the C. elegans genome revealed a great similarity between worms and higher vertebrates, which suggests that research in worms could be an important adjunct to studies performed in whole mice or cultured cells. A powerful and important part of worm research is the ability to use transgenic animals to study gene localization and function. Transgenic animals can be created either via microinjection of the worm germline or through the use of biolistic bombardment. Bombardment is a newer technique and is less familiar to a number of labs. Here we describe a simple protocol to generate transgenic worms by biolistic bombardment with gold particles using the Bio-Rad PDS-1000 system. Compared with DNA microinjection into hermaphrodite germline, this protocol has the advantage of not requiring special skills from the operator with regards to identifying worm anatomy or performing microinjection. Further multiple transgenic lines are usually obtained from a single bombardment. Also in contrast to microinjection, biolistic bombardment produces transgenic animals with both extrachromosomal arrays and integrated transgenes. The ability to obtain integrated transgenic lines can avoid the use of mutagenic protocols to integrate foreign DNA. In conclusion, biolistic bombardment can be an attractive method for the generation of transgenic animals, especially for investigators not interested in investing the time and effort needed to become skilled at microinjection.

Generation of Transgenic C. elegans by Biolistic Transformation

Transgenic worms are commonly used in C. elegans research. Described is a simple, yet effective, protocol to introduce transgenes into worms using biolistic bombardment with DNA-coated gold particles. The effort involved and results of bombardment compare favorably with microinjection for the generation of transgenic animals.

דור טראנסגנטי ג elegans על ידי שינוי Biolistic

The number of laboratories using the free living nematode C. elegans is rapidly growing. The popularity of this biological model is attributed to a rapid ...

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.

בידוד במבחנה הפעלת Caenorhabditis elegans זרע

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

Time-lapse Microscopy of Early Embryogenesis in Caenorhabditis elegans

Caenorhabditis elegans has often been used as a model system in studies of early developmental processes. The transparency of the 
embryos, the genetic resources, and the relative ease of transformation are qualities that make C. elegans an excellent model for early embryogenesis. Laser-based 
confocal microscopy and fluorescently labeled tags allow researchers to follow specific cellular structures and proteins in the developing embryo. For example, 
one can follow specific organelles, such as lysosomes or mitochondria, using fluorescently labeled dyes. These dyes can be delivered to the early embryo by means 
of microinjection into the adult gonad. Also, the localization of specific proteins can be followed using fluorescent protein tags. Examples are presented here 
demonstrating the use of a fluorescent lysosomal dye as well as fluorescently tagged histone and ubiquitin proteins. The labeled histone is used to visualize 
the DNA and thus identify the stage of the cell cycle. GFP-tagged ubiquitin reveals the dynamics of ubiquitinated vesicles in the early embryo. Observations 
of labeled lysosomes and GFP:: ubiquitin can be used to determine if there is colocalization between ubiquitinated vesicles and lysosomes. A technique for 
the microinjection of the lysosomal dye is presented. Techniques for generating transgenenic strains are presented elsewhere (1, 2). For imaging, embryos 
are cut out of adult hermaphrodite nematodes and mounted onto 2% agarose pads followed by time-lapse microscopy on a standard laser scanning confocal 
microscope or a spinning disk confocal microscope. This methodology provides for the high resolution visualization of early embryogenesis.

Time-lapse Microscopy of Early Embryogenesis in Caenorhabditis elegans

This article describes a technique for the visualization of the early events of embryogenesis in the nematode Caenorhabditis elegans.

זמן לשגות מיקרוסקופית של העובר בשלב מוקדם Caenorhabditis elegans

Caenorhabditis elegans has often been used as a model system in studies of early developmental processes.  The transparency of the 
embryos, the genetic ...

Basic Caenorhabditis elegans Methods: Synchronization and Observation

Research into the molecular and developmental biology of the nematode Caenorhabditis elegans was begun in the early seventies by Sydney Brenner and it has since been used extensively as a model organism 1. C. elegans possesses key attributes such as simplicity, transparency and short life cycle that have made it a suitable experimental system for fundamental biological studies for many years 2. Discoveries in this nematode have broad implications because many cellular and molecular processes that control animal development are evolutionary conserved 3.
C. elegans life cycle goes through an embryonic stage and four larval stages before animals reach adulthood. Development can take 2 to 4 days depending on the temperature. In each of the stages several characteristic traits can be observed. The knowledge of its complete cell lineage 4,5 together with the deep annotation of its genome turn this nematode into a great model in fields as diverse as the neurobiology 6, aging 7,8, stem cell biology 9 and germ line biology 10. 
An additional feature that makes C. elegans an attractive model to work with is the possibility of obtaining populations of worms synchronized at a specific stage through a relatively easy protocol. The ease of maintaining and propagating this nematode added to the possibility of synchronization provide a powerful tool to obtain large amounts of worms, which can be used for a wide variety of small or high-throughput experiments such as RNAi screens, microarrays, massive sequencing, immunoblot or in situ hybridization, among others. 
Because of its transparency, C. elegans structures can be distinguished under the microscope using Differential Interference Contrast microscopy, also known as Nomarski microscopy. The use of a fluorescent DNA binder, DAPI (4',6-diamidino-2-phenylindole), for instance, can lead to the specific identification and localization of individual cells, as well as subcellular structures/defects associated to them.

Basic Caenorhabditis elegans Methods: Synchronization and Observation

The easiness of maintaining and propagating the nematode C. elegans make it a nice model organism to work with. The possibility of synchronizing worms allows the work with a significant amount of subjects at the same developmental stage, what facilitates the study of one particular process in many animals.

בסיסי<em&gt; Caenorhabditis elegans</em&gt; שיטות: סנכרון תצפית

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

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.

הפקה וניתוח בפרוסטגלנדין<em&gt; Elegans Caenorhabditis</em

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

Culturing of Human Nasal Epithelial Cells at the Air Liquid Interface

In vitro models using human primary epithelial cells are essential in understanding key functions of the respiratory epithelium in the context of microbial infections or inhaled agents. Direct comparisons of cells obtained from diseased populations allow us to characterize different phenotypes and dissect the underlying mechanisms mediating changes in epithelial cell function. Culturing epithelial cells from the human tracheobronchial region has been well documented, but is limited by the availability of human lung tissue or invasiveness associated with obtaining the bronchial brushes biopsies. Nasal epithelial cells are obtained through much less invasive superficial nasal scrape biopsies and subjects can be biopsied multiple times with no significant side effects. Additionally, the nose is the entry point to the respiratory system and therefore one of the first sites to be exposed to any kind of air-borne stressor, such as microbial agents, pollutants, or allergens. 
Briefly, nasal epithelial cells obtained from human volunteers are expanded on coated tissue culture plates, and then transferred onto cell culture inserts. Upon reaching confluency, cells continue to be cultured at the air-liquid interface (ALI), for several weeks, which creates more physiologically relevant conditions. The ALI culture condition uses defined media leading to a differentiated epithelium that exhibits morphological and functional characteristics similar to the human nasal epithelium, with both ciliated and mucus producing cells. Tissue culture inserts with differentiated nasal epithelial cells can be manipulated in a variety of ways depending on the research questions (treatment with pharmacological agents, transduction with lentiviral vectors, exposure to gases, or infection with microbial agents) and analyzed for numerous different endpoints ranging from cellular and molecular pathways, functional changes, morphology, etc. 
In vitro models of differentiated human nasal epithelial cells will enable investigators to address novel and important research questions by using organotypic experimental models that largely mimic the nasal epithelium in vivo.

Nasal epithelial cells, obtained through superficial scrape biopsy of human volunteers, are expanded and transferred onto tissue culture inserts. Upon reaching confluency, cells are grown at air liquid interface, yielding cultures of ciliated and non-ciliated cells. Differentiated nasal epithelial cell cultures provide viable experimental models for studying the respiratory mucosa.

Culturing של אדם תאי אפיתל באף בממשק האוויר הנוזלי

In vitro models using human primary  epithelial cells are essential in understanding key functions of the respiratory  epithelium in the context of ...

A Screenable In Vivo Assay for Mitochondrial Modulators Using Transgenic Bioluminescent Caenorhabditis elegans

The multicellular model organism Caenorhabditis elegans is a small nematode of approximately 1 mm in size in adulthood that is genetically and experimentally tractable. It is economical and easy to culture and dispense in liquid medium which makes it well suited for medium-throughput screening. We have previously validated the use of transgenic luciferase expressing C. elegans strains to provide rapid in vivo assessment of the nematode&#8217;s ATP levels.1-3 Here we present the required materials and procedure to carry out bioassays with the bioluminescent C. elegans strains PE254 or PE255 (or any of their derivative strains). The protocol allows for in vivo detection of sublethal effects of drugs that may identify mitochondrial toxicity, as well as for in vivo detection of potential beneficial drug effects. Representative results are provided for the chemicals paraquat, rotenone, oxaloacetate and for four firefly luciferase inhibitory compounds. The methodology can be scaled up to provide a platform for screening drug libraries for compounds capable of modulating mitochondrial function. Pre-clinical evaluation of drug toxicity is often carried out on immortalized cancerous human cell lines which derive ATP mostly from glycolysis and are often tolerant of mitochondrial toxicants.4,5 In contrast, C. elegans depends on oxidative phosphorylation to sustain development into adulthood, drawing a parallel with humans and providing a unique opportunity for compound evaluation in the physiological context of a whole live multicellular organism.

A Screenable In Vivo Assay for Mitochondrial Modulators Using Transgenic Bioluminescent Caenorhabditis elegans

A protocol is described for in vivo detection of effects of mitochondrial inhibitors in the model organism Caenorhabditis elegans and for identification of potential enhancing compounds. This protocol can be used to screen drug libraries for compounds modulating mitochondrial function.

Screenable<em&gt; In vivo</em&gt; Assay עבור מיטוכונדריאלי מאפנני שימוש הטרנסגניים Bioluminescent<em&gt; Elegans Caenorhabditis</em

The multicellular model organism Caenorhabditis elegans is a small nematode of approximately 1 mm in size in adulthood that is genetically and ...

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.

משולב נוקלאוטיד שיחולץ חלבון ב Caenorhabditis elegans

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.

מדידה של קצב הצריכה של חמצן בשלם Caenorhabditis elegans

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

Culturing

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