ברצוננו להודות ליינג יו לגנוטיפ / + עכברי Min APC. מחקר זה נתמך על ידי כספים מINSERM ומענקים (CA057621 וAI053194) מהמכון הלאומי לבריאות.

<ol>
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K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Multiple+intestinal+neoplasia+caused+by+a+mutation+in+the+murine+homolog+of+the+APC+gene.">Multiple intestinal neoplasia caused by a mutation in the murine homolog of the APC gene.</a> Science. 256 (5057), 668-670 (1992).</li><li>Watson, A. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Epithelial+barrier+function+in+vivo+is+sustained+despite+gaps+in+epithelial+layers.">Epithelial barrier function in vivo is sustained despite gaps in epithelial layers.</a> Gastroenterology. 129 (3), 902-912 (2005).</li><li>McDole, J. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Goblet+cells+deliver+luminal+antigen+to+CD103++dendritic+cells+in+the+small+intestine.">Goblet cells deliver luminal antigen to CD103+ dendritic cells in the small intestine.</a> Nature. 483 (7389), 345-349 (2012).</li><li>Xu, C., Shen, Y., Littman, D. R., Dustin, M. L., Velazquez, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Visualization+of+mucosal+homeostasis+via+single-+and+multiphoton+intravital+fluorescence+microscopy.">Visualization of mucosal homeostasis via single- and multiphoton intravital fluorescence microscopy.</a> J Leukoc Biol. 92 (3), 413-419 (2012).</li><li>Haigis, K. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Differential+effects+of+oncogenic+K-Ras+and+N-Ras+on+proliferation,+differentiation+and+tumor+progression+in+the+colon.">Differential effects of oncogenic K-Ras and N-Ras on proliferation, differentiation and tumor progression in the colon.</a> Nat Genet. 40 (5), 600-608 (2008).</li><li>Sansom, O. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Loss+of+Apc+allows+phenotypic+manifestation+of+the+transforming+properties+of+an+endogenous+K-ras+oncogene+in+vivo.">Loss of Apc allows phenotypic manifestation of the transforming properties of an endogenous K-ras oncogene in vivo.</a> Proc Natl Acad Sci U S A. 103 (38), 14122-14127 (2006).</li><li>Janssen, K. P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=APC+and+oncogenic+KRAS+are+synergistic+in+enhancing+Wnt+signaling+in+intestinal+tumor+formation+and+progression.">APC and oncogenic KRAS are synergistic in enhancing Wnt signaling in intestinal tumor formation and progression.</a> Gastroenterology. 131 (4), 1096-1109 (2006).</li><li>Takaku, K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intestinal+tumorigenesis+in+compound+mutant+mice+of+both+Dpc4+(Smad4)+and+Apc+genes.">Intestinal tumorigenesis in compound mutant mice of both Dpc4 (Smad4) and Apc genes.</a> Cell. 92 (5), 645-656 (1998).</li></ol>

The authors have nothing to disclose.

במאמר זה, פרוטוקול מפורט מתואר לספינינג confocal הדמיה דיסק של דינמיקת תא מיאלואידית בגידולים במעי במשך כמה שעות בחי, צילמו מהצד serosal של המעיים. כדי להימנע מדלקת ויש להם תנאים פיסיולוגיים אופטימליים, הדמיה של המעי צריכה להיעשות על הא?...

ראיות מכריעות עכשיו מוכיחות כי microenvironment הגידול, בהיקף של אוכלוסיות תאים הטרוגנית, הכוללים פיברובלסטים, תאי אנדותל, תאי מערכת חיסונית ודלקתיים, מטריצת חוץ תאית, וגורמים מסיסים, ממלא תפקיד מכריע בייזום ובהתפתחות של גידולים מוצקים על ידי תרומה לכמעט כל סימני ההיכר של סרטן 1. ואכן, במהלך התקדמות גידול, יש אינטראקציות דינמיות מתמידים בין תאים סרטניים ותאי סטרומה הפכו להתפתח ליצור microenvironment חיובי לממאירות 2. בין תאי מערכת החיסון שלהסתנן microenvironment הגידול, תאי מיאלואידית הם בשפע 3 ביותר. בהיקף של מקרופאגים גידולים הקשורים (TAM), תאים המדכאים המופקת מיאלואידית (MDSCs), תאים דנדריטים (DC) ונויטרופילים (PMNs), תאי מיאלואידית מגויסים ממח עצם ובהדרגה לחדור גידולים, משחררים ציטוקינים, גורמי גדילה ופרוטאזות ה יכול לקדםצמיחה וגידול התפשטה 4. Crosstalk בין תאים סרטניים ותאי מיאלואידית הוא מורכב, אך דינמי. כך ההבנה של מהות יחסי הגומלין שלהם היא קריטית לקביעה מדוע תאים אלה לקדם התקדמות הסרטן במקום משתתף בתגובה חיסונית כנגד גידול, ועשויה לעזור למצוא מטרות חדשות כדי לשלוט בו. תצפית ישירה על ידי מיקרוסקופ intravital מספקת מידע על דינמיקת תאים בתוך הרקמות של עכברים חיים 5. ארבעת צבעים, רב אזור, מערכת confocal דיסק מסתובב עם עדשות מיקרו נועד ללמוד תאי סטרומה בתוך גידולי החלב 6. גישה זו מאפשרת הדמיה רציפה לטווח ארוך וכוללת מספר יתרונות כגון (א) רכישת תמונות מהירות כדי למזער ממצא תנועה, (ב) הרדמה לטווח ארוך, ארבע רכישת צבע למעקב תאים מסוגים שונים (ג), תיוג ניאון (ד) רכיבים שונים של tumoral, ותצפית (ה) של שנינות microenvironments גידול שונהHin אותו העכבר כדי להימנע מעכבר ל7-9 השתנות עכבר. בעזרת טכנולוגיה זו, התנהגויות תאים שונות כבר דיווחו בוירוס גידול החלב מודל (MMTV) אונקוגן T אמצע polyoma מונע אמרגן (PyMT) המציג שלבים מתקדמים של יצירת גידולים. לימפוציטים מסוג T רגולטורים (Tregs, דמיין ידי transgene FOXP3 EGFP) להעביר באופן מועדף בסמוך לכלי דם ואילו DCS (CD11c-DTR-EGFP), פיברובלסטים הקשורים קרצינומה (Fsp1 + / + -EGFP) ותאי מיאלואידית (c-FMS -EGFP) מפגין תנועתיות גבוהה יותר בפריפריה מאשר הגידול במסת הגידול. במצב של היפוקסיה המערכתית החריפה, תאים נדדו באופן שונה: Tregs להפסיק נודדים בניגוד לתאי מיאלואידית שימשיכו לנוע 6. בנוסף, באותו מודל העכבר, זה כבר הראה כי רגישות דוקסורוביצין שינויים בשלב גידול, הפצת סמים קשורה לתגובת סמים, ודוקסורוביציןטיפול מביא לגיוס CCR2 תלוי של תאי מיאלואידית לגידולים. לפיכך, הדמיה חיה יכולה לשמש גם כדי לקבל תובנות לתוך תגובות בסמים באתר והביולוגיה של chemoresistance 10,11. מוטציות גנטיות coli polyposis (APC) adenomatous בדרך הכלל מתרחשות באדנומות אנושיות מעי גס וקרצינומה 12 ומוטציה של עותק בודד של תוצאות גן APC בpolyposis המשפחתי adenomatous (FAP), אשר מקנה סיכון גבוה ביותר לסרטן מעי גס 13. זן העכבר Apc מינימום / + נושא מוטציה עיצור בקודון 850 של הגן APC ואופן ספונטני מתפתח אדנומות במעי מרובה בכל רחבי המעי הדק 14- 16. ההדמיה intravital לטווח ארוך של המעי היא מאתגרת בגלל הפולשנות של ההליך, שכן פתיחת חלל הצפק היא הכרחית לגישה למעי. הדמיה חיה לזמן קצר studies כבר פורסם בעבר במעי בריא 17,18, אבל תצפית ישירה לטווח הארוך של גידולים במעי לא דווחה. הליך כירורגי תוכנן ומעודן לדמיין גידולים דרך פני השטח serosal של המעי, תוך שימוש במערכת מיקרוסקופ דיסק ספינינג intravital ששימשה בעבר לגידולי שד תמונת 6,10. במאמר זה, פרוטוקול מתואר המאפשר אחד כדי לעקוב אחר התנהגותם של תאי מיאלואידית בתוך הגידולים במעי הדק באמצעות Apc מינימום / + עכברים.

<table border="0" cellpadding="0" cellspacing="0" width="691">
	<tbody>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;"><a name="RANGE!A1:D30">Name of Material/ Equipment</a></td>
			<td style="width:107px;">Company</td>
			<td style="width:141px;">Catalog Number</td>
			<td style="width:227px;">Comments/Description</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">ApcMin/+ mice</td>
			<td style="width:107px;">Jackson Laboratory</td>
			<td>2020</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">ACTB-ECFP mice</td>
			<td style="width:107px;">Jackson Laboratory</td>
			<td style="width:141px;">3773</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">cfms-EGFP mice</td>
			<td style="width:107px;">Jackson Laboratory</td>
			<td align="right">18549</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">2,000 kDa Dextran, rhodamine-conjugated</td>
			<td style="width:107px;">Invitrogen</td>
			<td style="width:141px;">D7139</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Isoflurane</td>
			<td style="width:107px;">Butler Animal Health Supply</td>
			<td style="width:141px;">29450</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Nitrogen</td>
			<td style="width:107px;">UCSF</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Oxygen</td>
			<td style="width:107px;">UCSF</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">1X PBS</td>
			<td style="width:107px;">UCSF cell culture facility</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Saline Buffer</td>
			<td style="width:107px;">UCSF cell culture facility</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:216px;">Anti-mouse Ly-6G (GR1) antibody AF647</td>
			<td style="width:107px;">UCSF Monoclonal antibody core</td>
			<td style="width:141px;"></td>
			<td>Stock 1mg/ml. Use at 7ug/mouse</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Atropine</td>
			<td style="width:107px;">LARC UCSF</td>
			<td style="width:141px;"></td>
			<td>Use at 1mg/Kg mouse</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Alcohol wipes</td>
			<td style="width:107px;">Becton Dickinson</td>
			<td style="width:141px;">326895</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">28G1/2 insulin syringe</td>
			<td style="width:107px;">Becton Dickinson</td>
			<td style="width:141px;">329465</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Remium cover glass</td>
			<td style="width:107px;">Fisher Scientific</td>
			<td style="width:141px;">12-548-5M</td>
			<td>24x50-1</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Superfrost plus microscope slides</td>
			<td style="width:107px;">Fisher Scientific</td>
			<td style="width:141px;">12-550-15</td>
			<td>25x75x1mm</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Krazy glue</td>
			<td style="width:107px;">Office Max</td>
			<td align="right">7111555</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Betadine</td>
			<td style="width:107px;">LARC UCSF</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Heat blanket</td>
			<td style="width:107px;">Gaymar Industries</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Hot bead sterilizer</td>
			<td style="width:107px;">Fine Science Tools</td>
			<td style="width:141px;">18000-45</td>
			<td>Turn ON 30min before use</td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:216px;">Cotton tipped apllicators 6-inch</td>
			<td style="width:107px;">Electron Microscopy Sciences</td>
			<td style="width:141px;">72310-10</td>
			<td></td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:216px;">Anesthesia system</td>
			<td style="width:107px;">Summit Anesthesia Support</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Inverted microscope</td>
			<td style="width:107px;">Carl Zeiss Inc</td>
			<td style="width:141px;">Zeiss Axiovert 200M</td>
			<td></td>
		</tr>
		<tr height="84">
			<td height="84" style="height:84px;width:216px;">stage insert</td>
			<td style="width:107px;">Applied Sientific Instrumentation</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Mouse Ox oximeter, software and sensors</td>
			<td style="width:107px;">Starr Life Sciences</td>
			<td style="width:141px;">MouseOx</td>
			<td></td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:216px;">Nebulizer</td>
			<td style="width:107px;">Summit Anesthesia Support</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Imaris</td>
			<td style="width:107px;">Bitplane</td>
			<td style="width:141px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">mManager</td>
			<td style="width:107px;">Vale lab, UCSF</td>
			<td style="width:141px;"></td>
			<td>Open-source software</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">ICCD camera</td>
			<td style="width:107px;">Stanford Photonics</td>
			<td style="width:141px;">XR-Mega-10EX S-30</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Spinning disk confocal sacan-head</td>
			<td style="width:107px;">Yokogawa Corporation</td>
			<td style="width:141px;">CSU-10b</td>
			<td></td>
		</tr>
	</tbody>
</table>

real-time imaging of myeloid cells dynamics in apcmin/+ intestinal tumors by spinning disk confocal microscopy

תאי מיאלואידית הם התאים חיסוניים הנפוצים ביותר בגידולים והוכחו לקדם התקדמות גידול. טכניקות הדמיה intravital מודרניות מאפשרות התצפית של התנהגות תאית חי בתוך האיבר אבל יכולות להיות מאתגר בסוגים מסוימים של הסרטן בשל נגישות איבר וגידול כגון מעי. תצפית ישירה של גידולים במעי לא דווחה בעבר. הליך כירורגי המתואר כאן מאפשר תצפית ישירה של דינמיקת תא מיאלואידית בתוך הגידולים במעיים בעכברים חיים באמצעות עכברי כתב ניאון מהונדסים וקליעים נותבים או נוגדנים להזרקה. לצורך כך, נעשה שימוש בארבעה צבעים, רב אזור, מיקרוסקופ confocal דיסק מסתובב עם עדשות מיקרו, המאפשר הדמיה רציפה ארוך טווח עם רכישת תמונה מהירה. Apc מינימאלי עכברים / + המתפתחים אדנומות מרובות במעי הדק הם חצו עם עכברי c-FMS-EGFP לדמיין תאי מיאלואידית ועם עכברי ACTB-ECFPלדמיין תאי אפיתל במעי של מאורות. נהלים לתיוג רכיבי גידול שונים, כגון כלי דם ונויטרופילים, ואת ההליך למיצוב גידול הדמיה דרך פני השטח serosal גם מתוארים. זמן לשגות סרטים מלוקט מכמה שעות של הדמיה מאפשרים הניתוח של מיאלואידית התנהגות תא באתרו בmicroenvironment המעיים.

באמצעות מיקרוסקופיה confocal הדיסק מסתובבת, רקמות שאינן tumoral וtumoral במעי הדק של Apc מינימום / +; ACTB-ECFP; ניתן דמיינו עכברים c-FMS-ECFP מפני שטח serosal. לאחר הדמיה, תוכנת מצלמה משמשת כדי לנתח ולהתאים את הרכישה (איור משלים 1). לאחר (iv) הזרקה תוך ורידית של dextran-rho...

Watch this Scientific Journal Video about Real-time Imaging of Myeloid Cells Dynamics in ApcMin/+ Intestinal Tumors by Spinning Disk Confocal Microscopy at JoVE.com

Real-time Imaging of Myeloid Cells Dynamics in ApcMin/+ Intestinal Tumors by Spinning Disk Confocal Microscopy

By using transgenic reporter mice and injectable fluorescent labels, long-term intravital spinning disk confocal microscopy enables direct visualization of myeloid cell behavior into intestinal adenoma in the ApcMin/+ colorectal cancer model.

הדמיה של Dynamics התאים מיאלואידית בזמן אמת<em&gt; Apc<sup&gt; מינימום / +</sup</em&gt; מעיים גידולים על ידי דיסק מסתובב Confocal מיקרוסקופית

Myeloid cells are the most abundant immune cells within tumors and have been shown to promote tumor progression. Modern intravital imaging techniques ...

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Immunology and Infection

Real-time Imaging of Myeloid Cells Dynamics in ApcMin/+ Intestinal Tumors by Spinning Disk Confocal Microscopy

9.6K Views.  INSERM U661, Functional Genomic Institute. By using transgenic reporter mice and injectable fluorescent labels, long-term intravital spinning disk confocal microscopy enables direct visualization of myeloid cell behavior into intestinal adenoma in the ApcMin/+ colorectal cancer model. 

Video: Real-time Imaging of Myeloid Cells Dynamics in ApcMin/+ Intestinal Tumors by Spinning Disk Confocal Microscopy

Intravital Microscopy of the Spleen: Quantitative Analysis of Parasite Mobility and Blood Flow

The advent of intravital microscopy in experimental rodent malaria models has allowed major advances to the knowledge of parasite-host interactions 1,2. Thus, in vivo imaging of malaria parasites during pre-erythrocytic stages have revealed the active entrance of parasites into skin lymph nodes 3, the complete development of the parasite in the skin 4, and the formation of a hepatocyte-derived merosome to assure migration and release of merozoites into the blood stream 5. Moreover, the development of individual parasites in erythrocytes has been recently documented using 4D imaging and challenged our current view on protein export in malaria 6. Thus, intravital imaging has radically changed our view on key events in Plasmodium development. Unfortunately, studies of the dynamic passage of malaria parasites through the spleen, a major lymphoid organ exquisitely adapted to clear infected red blood cells are lacking due to technical constraints.
Using the murine model of malaria Plasmodium yoelii in Balb/c mice, we have implemented intravital imaging of the spleen and reported a differential remodeling of it and adherence of parasitized red blood cells (pRBCs) to barrier cells of fibroblastic origin in the red pulp during infection with the non-lethal parasite line P.yoelii 17X as opposed to infections with the P.yoelii 17XL lethal parasite line 7. To reach these conclusions, a specific methodology using ImageJ free software was developed to enable characterization of the fast three-dimensional movement of single-pRBCs. Results obtained with this protocol allow determining velocity, directionality and residence time of parasites in the spleen, all parameters addressing adherence in vivo. In addition, we report the methodology for blood flow quantification using intravital microscopy and the use of different colouring agents to gain insight into the complex microcirculatory structure of the spleen. 
Ethics statement
All the animal studies were performed at the animal facilities of University of Barcelona in accordance with guidelines and protocols approved by the Ethics Committee for Animal Experimentation of the University of Barcelona CEEA-UB (Protocol No DMAH: 5429). Female Balb/c mice of 6-8 weeks of age were obtained from Charles River Laboratories.

We show the method for performing intravital microscopy of the spleen using GFP transgenic malaria parasites and the quantification of parasite mobility and blood flow within this organ.

מיקרוסקופית Intravital של הטחול: ניתוח כמותי של ניידות טפיל ואת זרימת הדם

The advent of intravital microscopy in experimental rodent malaria models has allowed major advances to the knowledge of parasite-host interactions 1,2. ...

A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins

Signaling is initiated through the T Cell Receptor (TCR) when it is engaged by antigenic peptide fragments bound by Major Histocompatibility Complex (pMHC) proteins expressed on the surface of antigen presenting cells (APCs). The TCR complex is composed of the ligand binding TCR&alpha;&beta; heterodimer that associates non-covalently with CD3 dimers (the &#949;&delta; and &#949;&gamma; heterodimers and the &zeta;&zeta; homodimer)1. Upon engagement of the receptor, the CD3 &zeta; chains are phosphorylated by the Src family kinase, Lck. This leads to the recruitment of the Syk family kinase, Zap70, which is then phosphorylated and activated by Lck. After that, Zap70 phosphorylates the adapter proteins LAT and SLP76, initiating the formation of the proximal signaling complex containing a large number of different signaling molecules2. 
The formation of this complex eventually results in calcium and Ras-dependent transcription factor activation and the consequent initiation of a complex series of gene expression programs that give rise to T cell differentiation2. TCR signals (and the resulting state of differentiation) are modulated by many other factors, including antigen potency and crosstalk with co-stimulatory/co-inhibitory, chemokine, and cytokine receptors 3-4. Studying the spatial and temporal organization of the proximal signaling complex under various stimulation conditions is, therefore, key to understanding the TCR signaling pathway as well as its regulation by other signaling pathways.
One very useful model system to study signaling initiated by the TCR at the plasma membrane in T cells is glass-supported lipid bilayers, as described previously5-6. They can be utilized to present antigenic pMHC complexes, adhesion, and co-stimulatory molecules to T cells-serving as artificial APCs. By imaging the T cells interacting with the lipid bilayer using total internal reflection fluorescence microscopy (TIRFM), we can restrict the excitation to within 100 nm of the space between the glass and the cell surface 7-8. This allows us to image primarily the signaling events occurring at the plasma membrane. As we are interested in imaging the recruitment of signaling proteins to the TCR complex, we describe a two-camera TIRF imaging system wherein the TCR, labeled with fluorescent Fab (fragment antigen binding) fragments of the H57 antibody (purified from hybridoma H57-597, ATCC, ATCC Number:HB-218) which is specific for TCR&beta;, and signaling proteins, tagged with GFP, may be imaged simultaneously and in real time. This strategy is necessary due to the highly dynamic nature of both the T cells and of the signaling events that are occurring at the TCR. This imaging modality has allowed researchers to image single ligands 9-11 as well as recruitment of signaling molecules to activated receptors and is an excellent system to study biochemistry in-situ12-16.

The compartmentalization of proteins either within the plasma membrane or into intracellular locations is one regulatory mechanism that can greatly influence signaling outcomes; hence, to understand signaling it is important to study the spatial and temporal behavior of the proteins involved. We describe here a TIRF microscopy based system to study signal transduction in T cells, but is broadly applicable.

טכניקה מיקרוסקופית TIRF הדמיה בזמן אמת סימולטני של TCR וחלבונים הקשורים אליו לשידור אותות

Signaling is initiated through the T Cell Receptor (TCR) when it is engaged by antigenic peptide fragments bound by Major Histocompatibility Complex ...

Detection of MicroRNAs in Microglia by Real-time PCR in Normal CNS and During Neuroinflammation

Microglia are cells of the myeloid lineage that reside in the central nervous system (CNS)1. These cells play an important role in pathologies of many diseases associated with neuroinflammation such as multiple sclerosis (MS)2. Microglia in a normal CNS express macrophage marker CD11b and exhibit a resting phenotype by expressing low levels of activation markers such as CD45. During pathological events in the CNS, microglia become activated as determined by upregulation of CD45 and other markers3. The factors that affect microglia phenotype and functions in the CNS are not well studied. MicroRNAs (miRNAs) are a growing family of conserved molecules (~22 nucleotides long) that are involved in many normal physiological processes such as cell growth and differentiation4 and pathologies such as inflammation5. MiRNAs downregulate the expression of certain target genes by binding complementary sequences of their mRNAs and play an important role in the activation of innate immune cells including macrophages6 and microglia7. In order to investigate miRNA-mediated pathways that define the microglial phenotype, biological function, and to distinguish microglia from other types of macrophages, it is important to quantitatively assess the expression of particular microRNAs in distinct subsets of CNS-resident microglia. Common methods for measuring the expression of miRNAs in the CNS include quantitative PCR from whole neuronal tissue and in situ hybridization. However, quantitative PCR from whole tissue homogenate does not allow the assessment of the expression of miRNA in microglia, which represent only 5-15% of the cells of neuronal tissue. Hybridization in situ allows the assessment of the expression of microRNA in specific cell types in the tissue sections, but this method is not entirely quantitative. In this report we describe a quantitative and sensitive method for the detection of miRNA by real-time PCR in microglia isolated from normal CNS or during neuroinflammation using experimental autoimmune encephalomyelitis (EAE), a mouse model for MS. The described method will be useful to measure the level of expression of microRNAs in microglia in normal CNS or during neuroinflammation associated with various pathologies including MS, stroke, traumatic injury, Alzheimer's disease and brain tumors.

Microglia are resident macrophages that provide the first line of defense and immune surveillance of the central nervous system. MicroRNAs are regulatory molecules that play an important role in many physiological processes including activation and differentiation of macrophages. In this article, we describe the method for measurement of microRNAs in microglia.

זיהוי של מיקרו RNA ב microglia על ידי Real-time PCR ב CNS רגיל ובמהלך Neuroinflammation

Microglia are cells of the myeloid lineage that reside in the central nervous system (CNS)1. These cells play an important role in pathologies of many ...

Real-time Live Imaging of T-cell Signaling Complex Formation

Protection against infectious diseases is mediated by the immune system 1,2. T lymphocytes are the master coordinators of the immune system, regulating the activation and responses of multiple immune cells 3,4. T-cell activation is dependent on the recognition of specific antigens displayed by antigen presenting cells (APCs). The T-cell antigen receptor (TCR) is specific to each T-cell clone and determines antigen specificity 5. The binding of the TCR to the antigen induces the phosphorylation of components of the TCR complex. In order to promote T-cell activation, this signal must be transduced from the membrane to the cytoplasm and the nucleus, initiating various crucial responses such as recruitment of signaling proteins to the TCR;APC site (the immune synapse), their molecular activation, cytoskeletal rearrangement, elevation of intracellular calcium concentration, and changes in gene expression 6,7. The correct initiation and termination of activating signals is crucial for appropriate T-cell responses. The activity of signaling proteins is dependent on the formation and termination of protein-protein interactions, post translational modifications such as protein phosphorylation, formation of protein complexes, protein ubiquitylation and the recruitment of proteins to various cellular sites 8. Understanding the inner workings of the T-cell activation process is crucial for both immunological research and clinical applications.
Various assays have been developed in order to investigate protein-protein interactions; however, biochemical assays, such as the widely used co-immunoprecipitation method, do not allow protein location to be discerned, thus precluding the observation of valuable insights into the dynamics of cellular mechanisms. Additionally, these bulk assays usually combine proteins from many different cells that might be at different stages of the investigated cellular process. This can have a detrimental effect on temporal resolution. The use of real-time imaging of live cells allows both the spatial tracking of proteins and the ability to temporally distinguish between signaling events, thus shedding light on the dynamics of the process 9,10. We present a method of real-time imaging of signaling-complex formation during T-cell activation. Primary T-cells or T-cell lines, such as Jurkat, are transfected with plasmids encoding for proteins of interest fused to monomeric fluorescent proteins, preventing non-physiological oligomerization 11. Live T cells are dropped over a coverslip pre-coated with T-cell activating antibody 8,9, which binds to the CD3/TCR complex, inducing T-cell activation while overcoming the need for specific activating antigens. Activated cells are constantly imaged with the use of confocal microscopy. Imaging data are analyzed to yield quantitative results, such as the colocalization coefficient of the signaling proteins.

We describe a live-cell imaging method that provides insight into protein dynamics during the T-cell activation process. We demonstrate the combined usage of the T-cell spreading assay, confocal microscopy and imaging analysis to yield quantitative results to follow signaling complex formation throughout T-cell activation.

הדמית חיה בזמן אמת של T-תא איתות גיבוש קומפלקס

Protection against infectious diseases is mediated by the immune system 1,2. T lymphocytes are the master coordinators of the immune system, regulating ...

Assessing Anti-fungal Activity of Isolated Alveolar Macrophages by Confocal Microscopy

The lung is an interface where host cells are routinely exposed to microbes and microbial products. Alveolar macrophages are the first-line phagocytic cells that encounter inhaled fungi and other microbes. Macrophages and other immune cells recognize Aspergillus motifs by pathogen recognition receptors and initiate downstream inflammatory responses. The phagocyte NADPH oxidase generates reactive oxygen intermediates (ROIs) and is critical for host defense. Although NADPH oxidase is critical for neutrophil-mediated host defense1-3, the importance of NADPH oxidase in macrophages is not well defined. The goal of this study was to delineate the specific role of NADPH oxidase in macrophages in mediating host defense against A. fumigatus. We found that NADPH oxidase in alveolar macrophages controls the growth of phagocytosed A. fumigatus spores4. Here, we describe a method for assessing the ability of mouse alveolar macrophages (AMs) to control the growth of phagocytosed Aspergillus spores (conidia). Alveolar macrophages are stained in vivo and ten days later isolated from mice by bronchoalveolar lavage (BAL). Macrophages are plated onto glass coverslips, then seeded with green fluorescent protein (GFP)-expressing A. fumigatus spores. At specified times, cells are fixed and the number of intact macrophages with phagocytosed spores is assessed by confocal microscopy.

A method to evaluate the ability of isolated mouse alveolar macrophages to control the growth of phagocytosed Aspergillus spores by confocal microscopy.

הערכת פעילות אנטי פטרייתי של מבודדים מכתשיים המקרופאגים ידי מיקרוסקופיה confocal

The lung is an interface where host cells are routinely exposed to microbes and microbial products. Alveolar macrophages are the first-line phagocytic ...

The Mesenteric Lymph Duct Cannulated Rat Model: Application to the Assessment of Intestinal Lymphatic Drug Transport

The intestinal lymphatic system plays key roles in fluid transport, lipid absorption and immune function. Lymph flows directly from the small intestine via a series of lymphatic vessels and nodes that converge at the superior mesenteric lymph duct. Cannulation of the mesenteric lymph duct thus enables the collection of mesenteric lymph flowing from the intestine. Mesenteric lymph consists of a cellular fraction of immune cells (99% lymphocytes), aqueous fraction (fluid, peptides and proteins such as cytokines and gut hormones) and lipoprotein fraction (lipids, lipophilic molecules and apo-proteins). The mesenteric lymph duct cannulation model can therefore be used to measure the concentration and rate of transport of a range of factors from the intestine via the lymphatic system. Changes to these factors in response to different challenges (e.g., diets, antigens, drugs) and in disease (e.g., inflammatory bowel disease, HIV, diabetes) can also be determined. An area of expanding interest is the role of lymphatic transport in the absorption of orally administered lipophilic drugs and prodrugs that associate with intestinal lipid absorption pathways. Here we describe, in detail, a mesenteric lymph duct cannulated rat model which enables evaluation of the rate and extent of lipid and drug transport via the lymphatic system for several hours following intestinal delivery. The method is easily adaptable to the measurement of other parameters in lymph. We provide detailed descriptions of the difficulties that may be encountered when establishing this complex surgical method, as well as representative data from failed and successful experiments to provide instruction on how to confirm experimental success and interpret the data obtained.

Here we describe a technique to cannulate the mesenteric lymph duct in rats which enables quantification of lipid and drug transport via the lymphatic system following intestinal delivery. The technique can be adapted to assess mesenteric lymph concentrations and/or transport of fluid, immune cells, peptides, proteins and lipophilic molecules.

לימפה Duct cannulated עכברוש דגם mesenteric: בקשה להערכה של המעיים הלימפה תרופות תחבורה

The intestinal lymphatic system plays key roles in fluid transport, lipid absorption and immune function. Lymph flows directly from the small intestine ...

Induction of Murine Intestinal Inflammation by Adoptive Transfer of Effector CD4+CD45RBhigh T Cells into Immunodeficient Mice

There are many different animal models available for studying the pathogenesis of human inflammatory bowel diseases (IBD), each with its own advantages and disadvantages. We describe here an experimental colitis model that is initiated by adoptive transfer of syngeneic splenic CD4+CD45RBhigh T cells into T and B cell deficient recipient mice. The CD4+CD45RBhigh T cell population that largely consists of na&#239;ve effector cells is capable of inducing chronic intestinal inflammation, closely resembling key aspects of human IBD. This method can be manipulated to study aspects of disease onset and progression. Additionally it can be used to study the function of innate, adaptive, and regulatory immune cell populations, and the role of environmental exposures, i.e., the microbiota, in intestinal inflammation. In this article we illustrate the methodology for inducing colitis with a step-by-step protocol. This includes a video demonstration of key technical aspects required to successfully develop this murine model of experimental colitis for research purposes.

Induction of Murine Intestinal Inflammation by Adoptive Transfer of Effector CD4+CD45RBhigh T Cells into Immunodeficient Mice

Here, we present a protocol to induce colonic inflammation in mice by adoptive transfer of syngeneic CD4+CD45RBhigh T cells into T and B cell deficient recipients. Clinical and histopathological features mimic human inflammatory bowel diseases. This method allows the study of the initiation of colonic inflammation and progression of disease.

אינדוקציה של Murine דלקת מעיים על ידי העברת המאמצת של מפעיל CD4<sup&gt; +</sup&gt; CD45RB<sup&gt; גבוה</sup&gt; תאי T לעכברי immunodeficient

There are many different animal models available for studying the pathogenesis of human inflammatory bowel diseases (IBD), each with its own advantages ...

Analysis of Yersinia enterocolitica Effector Translocation into Host Cells Using Beta-lactamase Effector Fusions

Many gram-negative bacteria including pathogenic Yersinia spp. employ type III secretion systems to translocate effector proteins into eukaryotic target cells. Inside the host cell the effector proteins manipulate cellular functions to the benefit of the bacteria. To better understand the control of type III secretion during host cell interaction, sensitive and accurate assays to measure translocation are required. We here describe the application of an assay based on the fusion of a Yersinia enterocolitica effector protein fragment (Yersinia outer protein; YopE) with TEM-1 beta-lactamase for quantitative analysis of translocation. The assay relies on cleavage of a cell permeant FRET dye (CCF4/AM) by translocated beta-lactamase fusion. After cleavage of the cephalosporin core of CCF4 by the beta-lactamase, FRET from coumarin to fluorescein is disrupted and excitation of the coumarin moiety leads to blue fluorescence emission. Different applications of this method have been described in the literature highlighting its versatility. The method allows for analysis of translocation in vitro and also in in vivo, e.g., in a mouse model. Detection of the fluorescence signals can be performed using plate readers, FACS analysis or fluorescence microscopy. In the setup described here, in vitro translocation of effector fusions into HeLa cells by different Yersinia mutants is monitored by laser scanning microscopy. Recording intracellular conversion of the FRET reporter by the beta-lactamase effector fusion in real-time provides robust quantitative results. We here show exemplary data, demonstrating increased translocation by a Y. enterocolitica YopE mutant compared to the wild type strain.

Analysis of Yersinia enterocolitica Effector Translocation into Host Cells Using Beta-lactamase Effector Fusions

Effector translocation into host cells via a type III secretion system is a common virulence strategy among gram-negative bacteria. A beta-lactamase effector fusion based assay for quantitative analysis of translocation was applied. In Yersinia infected cells, conversion of a FRET reporter by the beta-lactamase is monitored using laser scanning microscopy.

ניתוח של<em&gt; Enterocolitica Yersinia</em&gt; מפעיל טרנסלוקציה לתאי מארח שימוש בטא לקטמאז מפעיל Fusions

Many gram-negative bacteria including pathogenic Yersinia spp. employ type III secretion systems to translocate effector proteins into eukaryotic target ...

Imaging Neutrophils and Monocytes in Mesenteric Veins by Intravital Microscopy on Anaesthetized Mice in Real Time

Efficient immune response is dependent on rapid mobilization of blood leukocytes to the site of infection or injury. Investigating leukocyte migration in vivo is crucial for understanding the molecular basis of leukocyte transendothelial migration and interaction with vascular endothelium. One powerful approach involves intravital microscopy on transgenic mice expressing fluorescent proteins in cells of interest.
Here we present a protocol for imaging monocytes and neutrophils in the CX3CR1gfp/wt mouse i.v. injected with orange dye-labeled neutrophils with an inverted confocal microscope. Time-lapse movies gathered from 30 min&#160;to several hours of imaging allow the analysis of leukocyte behavior in mesenteric veins under both steady state and inflammatory conditions. We also describe the steps to locally induce blood vessel inflammation with TLR2/TLR1 agonist Pam3SK4 and monitor the subsequent recruitment of neutrophils and monocytes.
The presented technique can also be used to monitor other populations of leukocytes and investigate molecules implicated in leukocyte recruitment or trafficking using other stimuli or transgenic mice.

We detail a protocol to monitor the behavior of neutrophils and monocytes in mesenteric veins under steady state and inflammatory conditions using intravital confocal microscopy on anaesthetized mice.

הדמיה נויטרופילים ומונוציטים בmesenteric ורידים על ידי מיקרוסקופית Intravital על עכברים מורדמים בזמן אמת

Efficient immune response is dependent on rapid mobilization of blood leukocytes to the site of infection or injury. Investigating leukocyte migration in ...

Cortical Actin Flow in T Cells Quantified by Spatio-temporal Image Correlation Spectroscopy of Structured Illumination Microscopy Data

Filamentous-actin plays a crucial role in a majority of cell processes including motility and, in immune cells, the formation of a key cell-cell interaction known as the immunological synapse. F-actin is also speculated to play a role in regulating molecular distributions at the membrane of cells including sub-membranous vesicle dynamics and protein clustering. While standard light microscope techniques allow generalized and diffraction-limited observations to be made, many cellular and molecular events including clustering and molecular flow occur in populations at length-scales far below the resolving power of standard light microscopy. By combining total internal reflection fluorescence with the super resolution imaging method structured illumination microscopy, the two-dimensional molecular flow of F-actin at the immune synapse of T cells was recorded. Spatio-temporal image correlation spectroscopy (STICS) was then applied, which generates quantifiable results in the form of velocity histograms and vector maps representing flow directionality and magnitude. This protocol describes the combination of super-resolution imaging and STICS techniques to generate flow vectors at sub-diffraction levels of detail. This technique was used to confirm an actin flow that is symmetrically retrograde and centripetal throughout the periphery of T cells upon synapse formation.

To investigate flow velocities and directionality of filamentous-actin at the T cell immunological synapse, live-cell super-resolution imaging is combined with total internal reflection fluorescence and quantified with spatio-temporal image correlation spectroscopy.

הדמיה של Dynamics התאים מיאלואידית בזמן אמת

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