מחקר זה מומן על ידי Forschungsgemeinschaft דויטשה לSW (DFG WA 2804) ומענק לאוניברסיטת SW מהמרכז למחקר הניסויי וקליני, שיתוף פעולה של מקס Delbrück מרכז לרפואה מולקולרית ופקולטה לרפואת Charité בברלין. היו הממנים שום תפקיד בתכנון מחקר, איסוף וניתוח נתונים, החלטה לפרסם או הכנה של כתב היד. אנו מודים למר רוברט Westphal לקבלת תמיכה טכנית בתקופת ההתמחות שלו במעבדה שלנו.

<ol>
	<li>Yeh, T. C., Zhang, W., Ildstad, S. T., Ho, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vivo+dynamic+MRI+tracking+of+rat+T-cells+labeled+with+superparamagnetic+iron-oxide+particles.">In vivo dynamic MRI tracking of rat T-cells labeled with superparamagnetic iron-oxide particles.</a> Magn. Reson. Med. 33 (2), 200-208 (1995).</li><li>Weissleder, R., Cheng, H. C., Bogdanova, A., Bogdanov, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Magnetically+labeled+cells+can+be+detected+by+MR+imaging.">Magnetically labeled cells can be detected by MR imaging.</a> J. Magn. Reson. Imaging. 7 (1), 258-263 (1997).</li><li>Franklin, R. J., Blaschuk, K. L., Bearchell, M. C., Prestoz, L. L., Setzu, A., 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=Magnetic+resonance+imaging+of+transplanted+oligodendrocyte+precursors+in+the+rat+brain.">Magnetic resonance imaging of transplanted oligodendrocyte precursors in the rat brain.</a> NeuroReport. 10 (18), 3961-3965 (1999).</li><li>de Vries, I. J., Lesterhuis, W. J., Barentsz, J. O., Verdijk, P., van Krieken, J. H., 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=Magnetic+resonance+tracking+of+dendritic+cells+in+melanoma+patients+for+monitoring+of+cellular+therapy.">Magnetic resonance tracking of dendritic cells in melanoma patients for monitoring of cellular therapy.</a> Nat. Biotechnol. 23 (11), 1407-1413 (2005).</li><li>Liu, W., Frank, J. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Detection+and+quantification+of+magnetically+labeled+cells+by+cellular+MRI.">Detection and quantification of magnetically labeled cells by cellular MRI.</a> Eur. J. Radiol. 70 (2), 258-264 (2009).</li><li>Ahrens, E. T., Flores, R., Xu, H., Morel, P. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vivo+imaging+platform+for+tracking+immunotherapeutic+cells.">In vivo imaging platform for tracking immunotherapeutic cells.</a> Nat. Biotechnol. 23 (8), 983-987 (2005).</li><li>Holland, G. N., Bottomley, P. A., Hinshaw, W. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=F-19+Magnetic-Resonance+Imaging.">F-19 Magnetic-Resonance Imaging.</a> Journal of Magnetic Resonance. 28 (1), 133-136 (1977).</li><li>Partlow, K. C., Chen, J., Brant, J. A., Neubauer, A. M., Meyerrose, T. E., 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=19F+magnetic+resonance+imaging+for+stem/progenitor+cell+tracking+with+multiple+unique+perfluorocarbon+nanobeacons.">19F magnetic resonance imaging for stem/progenitor cell tracking with multiple unique perfluorocarbon nanobeacons.</a> FASEB J. 21 (8), 1647-1654 (2007).</li><li>Ruiz-Cabello, J., Walczak, P., Kedziorek, D. A., Chacko, V. P., Schmieder, A. H., 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=In+vivo+"hot+spot"+MR+imaging+of+neural+stem+cells+using+fluorinated+nanoparticles.">In vivo "hot spot" MR imaging of neural stem cells using fluorinated nanoparticles.</a> Magn. Reson. Med. 60 (6), 1506-1511 (2008).</li><li>Srinivas, M., Morel, P. A., Ernst, L. A., Laidlaw, D. H., Ahrens, E. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluorine-19+MRI+for+visualization+and+quantification+of+cell+migration+in+a+diabetes+model.">Fluorine-19 MRI for visualization and quantification of cell migration in a diabetes model.</a> Magn. Reson. Med. 58 (4), 725-734 (2007).</li><li>Waiczies, H., Lepore, S., Janitzek, N., Hagen, U., Seifert, F., 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=Perfluorocarbon+particle+size+influences+magnetic+resonance+signal+and+immunological+properties+of+dendritic+cells.">Perfluorocarbon particle size influences magnetic resonance signal and immunological properties of dendritic cells.</a> PLoS ONE. 6 (7), e21981 (2011).</li><li>Matheu, M. P., Sen, D., Cahalan, M. D., Parker, I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Generation+of+Bone+Marrow+Derived+Murine+Dendritic+Cells+for+Use+in+2-photon+Imaging.">Generation of Bone Marrow Derived Murine Dendritic Cells for Use in 2-photon Imaging.</a> J. Vis. Exp. (17), e773 (2008).</li><li>Inaba, K., Inaba, M., Romani, N., Aya, H., Deguchi, 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=Generation+of+large+numbers+of+dendritic+cells+from+mouse+bone+marrow+cultures+supplemented+with+granulocyte/macrophage+colony-stimulating+factor.">Generation of large numbers of dendritic cells from mouse bone marrow cultures supplemented with granulocyte/macrophage colony-stimulating factor.</a> Journal of Experimental Medicine. 176 (6), 1693-1702 (1992).</li><li>Lanzavecchia, A., Sallusto, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ralph+M.+Steinman.+1943-2011.">Ralph M. Steinman. 1943-2011.</a> Cell. 147 (6), 1216-1217 (1943).</li><li>Srinivas, M., Turner, M. S., Janjic, J. M., Morel, P. A., Laidlaw, D. H., 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=In+vivo+cytometry+of+antigen-specific+t+cells+using+19F.">In vivo cytometry of antigen-specific t cells using 19F.</a> MRI. Magn. Reson. Med. 62 (3), 747-753 (2009).</li><li>Srinivas, M., Heerschap, A., Ahrens, E. T., Figdor, C. G., de Vries, I. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=(19)F+MRI+for+quantitative+in+vivo+cell+tracking.">(19)F MRI for quantitative in vivo cell tracking.</a> Trends Biotechnol. 28 (7), 363-370 (2010).</li><li>Lammermann, T., Bader, B. L., Monkley, S. J., Worbs, T., Wedlich-Soldner, 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=Rapid+leukocyte+migration+by+integrin-independent+flowing+and+squeezing.">Rapid leukocyte migration by integrin-independent flowing and squeezing.</a> Nature. 453 (7191), 51-55 (2008).</li><li>Liu, M. S., Long, D. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Perfluoroctylbromide+as+a+diagnostic+contrast+medium+in+gastroenterography.">Perfluoroctylbromide as a diagnostic contrast medium in gastroenterography.</a> Radiology. 122 (1), 71-76 (1977).</li><li>Kwiatkowska, K., Sobota, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Signaling+pathways+in+phagocytosis.">Signaling pathways in phagocytosis.</a> Bioessays. 21 (5), 422-431 (1999).</li><li>Mitragotri, S., Lahann, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Physical+approaches+to+biomaterial+design.">Physical approaches to biomaterial design.</a> Nat. Mater. 8 (1), 15-23 (2009).</li><li>Hoult, D. I., Richards, R. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+signal-to-noise+ratio+of+the+nuclear+magnetic+resonance+experiment.">The signal-to-noise ratio of the nuclear magnetic resonance experiment.</a> J. Magn. Reson. 24 (1), 71-85 (1976).</li><li>Kovacs, H., Moskau, D., Spraul, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cryogenically+cooled+probes+-+a+leap+in+NMR+technology.">Cryogenically cooled probes - a leap in NMR technology.</a> Prog. Nucl. Magn. Reson. Spectrosc. 46 (2-3), 131-155 (2005).</li><li>Waiczies, H., Millward, J. M., Lepore, S., Infante-Duarte, C., Pohlmann, A., 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=Identification+of+Cellular+Infiltrates+during+Early+Stages+of+Brain+Inflammation+with+Magnetic+Resonance+Microscopy.">Identification of Cellular Infiltrates during Early Stages of Brain Inflammation with Magnetic Resonance Microscopy.</a> PLoS ONE. 7 (3), e32796 (2012).</li><li>Haacke, E. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Magnetic resonance imaging physical principles and sequence design. , (1999).</li></ol>

החוקרים מצהירים כי אין להם אינטרסים כלכליים מתחרים.

שיטה זו של העסקת נ 19/1 H MRI כדי לעקוב אחר התנועה של DC לימפה נותנת את ההזדמנות ללמוד את דפוסי הנדידה של תאי מערכת חיסון בגוף חי. תאים הדנדריטים הם דוגמאות מצוינות של מהירות העברת תאים חיסוניים כי הם מסוגלים לתמרן דרך מבנים תלת ממדיים ללא חוזקה הקפדה על מצעים ספ?...

המעקב של תאי in vivo הוא היבט חיוני בכמה תחומים של ביו. לשם כך, שיטות הדמיה בלתי פולשניות באופן סלקטיבי יכול למקם תאים על פני תקופה של זמן הן יקרים מאוד. לפני הפיתוח תלת ממדי התהודה מגנטית (MRI), המעקב של נדידת תאים החיסונית היה מוגבל לניתוחים מיקרוסקופים או ביופסיות רקמות. מעקב סלולרי בעזרת MRI זכה לתשומת לב עצומה בשנים האחרונות, לא רק לאימונולוגים לימוד התנהגות תא חיסון in vivo, אלא גם לחוקרי תאי גזע וקליניים. במהלך אמצע שנתי ה -90, המחקרים הראשונים על חלקיקי תחמוצת ברזל 1 יזם מפל של התפתחויות לתאי מעקב עם MRI. חלקיקי תחמוצת ברזל לקצר את זמן הרגיעה MR (T2 *) של התאים שכותרתו ובכך לגרום לדלדול באות תמונות MR. חלקיקי תחמוצת ברזל להיות מועסקים לתווית מקרופאגים 2, עמ &#39;oligodendrocyterogenitors 3 והרבה סוגי תאים אחרים. חלק מחלקיקים אלה גם אושרו קליני על ידי ה-FDA לתיוג חיסונים הסלולר בחולים מלנומה 4. מאז in vivo או תיוג vivo לשעבר של תאים עם חלקיקי תחמוצת ברזל מסתמך על קיצור של האות * T2 וזה אחרון יכול להיות גם הביא על ידי הבקשורות לרגישות T2 * השפעת vivo כגון דימומי מיקרו, מרבצי ברזל או בועות אוויר, זה עלול להיות קשה לזהות תאים שכותרתו in vivo מהרקע אחר T2 * הכחדות אות 5. במאמר זה, אנו מתארים טכניקה למעקב אחר תאים דנדריטים (DC) in vivo על ידי העסקת נ 19/1 דימות בתהודה מגנטית H (MRI). טכנולוגיית מעקב תא זה הוצגה רק בשנת 2005 6, כמה שנים אחרי שכבר דווחו היישומים הוכרו לראשונה ל19 F-MRI ב7. אדוה אחד חשובntage של 19 F מעל תיוג תא חלקיקי תחמוצת ברזל הוא התופעה הביולוגית הנמוכה של 19 F ברקמה, זה מאפשר לעקוב אחר תאים באופן סלקטיבי מאוד עם תמונות בעצם ללא רקע. יתר על כן, זה אפשרי לכיסוי אות נ 19 MR מהתאים המושתלים שכותרתו עם תמונות אנטומיות המתקבלות מהקונבנציונלי 1H-MRI. נ 19/1 H-MRI הוא אפוא רלוונטי במידה ניכרת למחקרים חוקרים נדידת תאים בגוף חי. תאים שנבדקו בשיטה זו מסומנים עם 19 חלקיקים ה-F-עשירים. perfluorocarbons סינטטי הנגזר (PFCs) עיקרם פחמן ואטומי פלואור משמש בדרך כלל כדי להכין את החלקיקים. תרכובות אלה הן מסיסים במים וצריכים להיות emulsified לפני היישום במבחנה או בגוף חי. גודל חלקיקי PFC הרגיל שהועסקו על ידי קבוצות אחרות לin vivo 19 ניסויי מעקב ה-F-MRIנע בין 100 ננומטר ו 245 ננומטר 6,8-10. עם זאת יש לנו הראינו כי היעילות בתיוג תאים דנדריטים עם עליות חלקיקי perfluoro-15-כתר-5-אתר (PFCE) עם חלקיקים בגודל הולך וגדל (&gt; 560 ננומטר). 11

<table border="1">
 <tbody>
 <tr>
 <td></td>
 <td></td>
 <td></td>
 <td>REAGENTS</td>
 </tr>
 <tr>
 <td>C57BL/6 mice</td>
 <td>Charles River, Berlin</td>
 <td></td>
 <td></td>
 </tr>
 <tr>
 <td>RPMI</td>
 <td>Gibco</td>
 <td>21875-091</td>
 <td></td>
 </tr>
 <tr>
 <td>FBS Superior</td>
 <td>Biochrom AG</td>
 <td>S 0615</td>
 <td></td>
 </tr>
 <tr>
 <td>HEPES</td>
 <td>Gibco-Invitrogen</td>
 <td>15630-056</td>
 <td></td>
 </tr>
 <tr>
 <td>Penicillin-Streptomycin</td>
 <td>Gibco</td>
 <td>15140-122</td>
 <td></td>
 </tr>
 <tr>
 <td>L-glutamine</td>
 <td>Gibco</td>
 <td>25030-024</td>
 <td></td>
 </tr>
 <tr>
 <td>Dulbecco's PBS</td>
 <td>Sigma Aldrich</td>
 <td>D8662</td>
 <td></td>
 </tr>
 <tr>
 <td>PFA</td>
 <td>Santa Cruz</td>
 <td>sc-281692</td>
 <td></td>
 </tr>
 <tr>
 <td>Perfluoro-15-crown-5-ether </td>
 <td>ChemPur</td>
 <td>391-1996</td>
 <td></td>
 </tr>
 <tr>
 <td>Pluronic F-68 </td>
 <td>Sigma Aldrich</td>
 <td>P5556</td>
 <td></td>
 </tr>
 <tr>
 <td>Petri dishes (35 x 10 mm)</td>
 <td>VWR, Germany</td>
 <td>391-1996</td>
 <td></td>
 </tr>
 <tr>
 <td>27 &frac12; G syringes</td>
 <td>VWR, Germany</td>
 <td>612-0151</td>
 <td></td>
 </tr>
 <tr>
 <td>Nylon cell strainers (100 &mu;m mesh) </td>
 <td>VWR, Germany</td>
 <td>734-0004</td>
 <td></td>
 </tr>
 <tr>
 <td>NMR tubes </td>
 <td>VWR, Germany</td>
 <td>634-0461</td>
 <td></td>
 </tr>
 <tr>
 <td></td>
 <td></td>
 <td></td>
 <td>EQUIPMENT</td>
 </tr>
 <tr>
 <td>Dissection tools</td>
 <td>FST</td>
 <td></td>
 <td></td>
 </tr>
 <tr>
 <td>CO2 incubator </td>
 <td>Binder</td>
 <td></td>
 <td></td>
 </tr>
 <tr>
 <td>Small animal MR system</td>
 <td>Bruker Biospin</td>
 <td></td>
 <td>9.4T BioSpec 94/20 USR, ParaVision Acquisition and Processing Software</td>
 </tr>
 <tr>
 <td>1H/19F dual-tunable volume RF coil </td>
 <td>Rapid Biomed, W&uuml;rzburg, Germany</td>
 <td></td>
 <td>35 mm inner diameter, 50 mm length</td>
 </tr>
 <tr>
 <td>19F spectroscopy coil </td>
 <td>in-house</td>
 <td></td>
 <td>tune/match loop coil, 4 turns, inner diameter 5 mm, 10 mm long, two capacitors for tuning and matching</td>
 </tr>
 <tr>
 <td>Isoflurane inhalation system</td>
 <td>F&ouml;hr Medical Instruments GmbH</td>
 <td></td>
 <td></td>
 </tr>
 <tr>
 <td>Animal monitoring system Model 1025</td>
 <td>SA Instruments Inc., New York, USA</td>
 <td></td>
 <td></td>
 </tr>
 </tbody>
</table>

monitoring dendritic cell migration using 19f / 1h magnetic resonance imaging

התקדמות רציפה בשיטות הדמיה בלתי פולשניות כגון הדמיה בתהודה מגנטית (MRI) השתפרה מאוד היכולת שלנו ללמוד תהליכים פיסיולוגיים או פתולוגי ביצורי חיים. MRI גם הוא להוכיח להיות כלי רב ערך עבור לכידת תאים מושתלים בגוף חי. אסטרטגיות תיוג תא ראשוניות לשימוש שנעשה MRI של סוכנים בניגוד המשפיעים על זמני ההרפיה MR (T1, T2, T2 *) ולהוביל לשיפור (T1) או דלדול (T2 *) של אות שבו תאים שכותרתו הם הווה. T2 * סוכני שיפור כגון סוכני תחמוצת ברזל (ultrasmall USPIO) להיות מועסקים ללמוד נדידת תאים וחלקם גם אושרו על ידי ה-FDA ליישום קליני. חסרון של T2 * סוכנים הוא הקושי להבחין הכחדת האות שנוצרה על ידי התאים שכותרתו מחפצים אחרים, כגון קרישי דם, מדמם מיקרו או בועות אוויר. במאמר זה, אנו מתארים טכניקה המתעוררות לתאי מעקב in vivo כיהוא מבוסס על סימון התאים עם פלואור (19 F) עשירים בחלקיקים. חלקיקים אלה הוכנו על ידי emulsifying perfluorocarbon (PFC) ולאחר מכן תרכובות המשמשים לתאי תווית, אשר לאחר מכן ניתן הדמיה על ידי 19 F-MRI. יתרונות חשובים של PFCs למעקב אחר תאי in vivo כולל (ט) היעדרות של פחמן בכריכת 19 F in vivo, אשר לאחר מכן מניב תמונות ללא רקע ולהשלים תא selectivityand (ii) את האפשרות לכמת את אות התא על ידי 19 F MR ספקטרוסקופיה .

שמונה עשר לעשרים ואחת שעות לאחר יישום intracutaneous, 19 תאים דנדריטים F-שכותרתו (DC) להעביר לימפה popliteal ניקוז. התנועה של DC דרך הצינורות הלימפה לבלוטה לימפה politeal ניקוז יכולה להיות מוערכת על ידי כיסה את התמונות אנטומיות H 1 עם 19 תמונות DC F (איור 2 א). יש לנו...

Watch this Scientific Journal Video about Monitoring Dendritic Cell Migration using 19F / 1H Magnetic Resonance Imaging at JoVE.com

Monitoring Dendritic Cell Migration using 19F / 1H Magnetic Resonance Imaging

מעקב של תאים באמצעות MRI זכה לתשומת לב ראויה לציון בשנים האחרונות. פרוטוקול זה מתאר את התיוג של תאים דנדריטים עם פלואור (<sup&gt; 19</sup&gt; חלקיקי F) עשירים, ביישום vivo של תאים אלה, וניטור היקף הגירתם לימפה עם הניקוז<sup&gt; 19</sup&gt; F /<sup&gt; 1</sup&gt; H-MRI ו<sup&gt; 19</sup&gt; F גברת.

נדידת תאים דנדריטים ניטור באמצעות<sup&gt; 19</sup&gt; F /<sup&gt; 1</sup&gt; H דימות תהודה מגנטית

Continuous  advancements in noninvasive imaging modalities such as magnetic resonance  imaging (MRI) have greatly improved our ability to study ...

monitoring-dendritic-cell-migration-using-19f-1h-magnetic-resonance

Universidad de Cartagena UDEC

Research

JoVE Journal

Immunology and Infection

Monitoring Dendritic Cell Migration using 19F / 1H Magnetic Resonance Imaging

11.8K Views.  A joint cooperation between the Charité Medical Faculty and the Max Delbrück Center for Molecular Medicine. מעקב של תאים באמצעות MRI זכה לתשומת לב ראויה לציון בשנים האחרונות. פרוטוקול זה מתאר את התיוג של תאים דנדריטים עם פלואור ( 19 חלקיקי F) עשירים, ביישום vivo של תאים אלה, וניטור היקף הגירתם לימפה עם הניקוז 19 F / 1 H-MRI ו 19 F גברת.

Video: Monitoring Dendritic Cell Migration using 19F / 1H Magnetic Resonance Imaging

Non-invasive Imaging of Leukocyte Homing and Migration in vivo

Two-photon (2P) microscopy is a high resolution imaging technique that has been broadly adapted by biologists. The value of 2P microscopy is that it provides rich spatiotemporal information regarding cell behaviors within intact tissues and in live mice. Leukocyte recruitment plays a significant role in host defense against infection and when unchecked, can contribute to inflammatory and autoimmune diseases. Studying leukocyte recruitment in vivo is technically challenging since cells are moving rapidly within vessels located deep within light scattering tissues. To date, most intravital imaging studies require surgical preparation to expose the blood vessels and tissues. To avoid the tissue damage and inflammation induced by surgery itself, here, we describe a non-invasive single-cell imaging approach that can be used to study leukocyte trafficking in the mouse footpad and phalanges. We discuss the technical aspects of our 2P imaging preparation and walk the reader through a typical experiment from initial set up to execution and data collection.

Non-invasive Imaging of Leukocyte Homing and Migration in vivo

Here, we describe a non-invasive two-photon (2P) microscopy approach to study leukocyte homing in the mouse footpad. We discuss the technical aspects of our tissue imaging preparation and walk the reader through a typical experiment from initial set up to execution and data collection.

לא פולשני הדמיה של ביות ליקוציט והגירה In vivo</em

Two-photon (2P) microscopy is a high resolution imaging technique that has been broadly adapted by biologists.  The value of 2P microscopy is that it ...

Real-time Imaging of Leukotriene B4 Mediated Cell Migration and BLT1 Interactions with &beta;-arrestin

G-protein coupled receptors (GPCRs) belong to the seven transmembrane protein family and mediate the transduction of extracellular signals to intracellular responses. GPCRs control diverse biological functions such as chemotaxis, intracellular calcium release, gene regulation in a ligand dependent manner via heterotrimeric G-proteins1-2. Ligand binding induces a series of conformational changes leading to activation of heterotrimeric G-proteins that modulate levels of second messengers such as cyclic adenosine monophosphate (cAMP), inositol triphosphate (IP3) and diacyl glycerol (DG). Concomitant with activation of the receptor ligand binding also initiates a series of events to attenuate the receptor signaling via desensitization, sequestration and/or internalization. The desensitization process of GPCRs occurs via receptor phosphorylation by G-protein receptor kinases (GRKs) and subsequent binding of &beta;-arrestins3. &beta;-arrestins are cytosolic proteins and translocate to membrane upon GPCR activation, binding to phosphorylated receptors (most cases) there by facilitating receptor internalization 4-6.
Leukotriene B4 (LTB4) is a pro-inflammatory lipid molecule derived from arachidonic acid pathway and mediates its actions via GPCRs, LTB4 receptor 1 (BLT1; a high affinity receptor) and LTB4 receptor 2 (BLT2; a low affinity receptor)7-9. The LTB4-BLT1 pathway has been shown to be critical in several inflammatory diseases including, asthma, arthritis and atherosclerosis10-17. The current paper describes the methodologies developed to monitor LTB4-induced leukocyte migration and the interactions of BLT1 with &beta;-arrestin and , receptor translocation in live cells using microscopy imaging techniques18-19.
Bone marrow derived dendritic cells from C57BL/6 mice were isolated and cultured as previously described 20-21. These cells were tested in live cell imaging methods to demonstrate LTB4 induced cell migration. The human BLT1 was tagged with red fluorescent protein (BLT1-RFP) at C-terminus and &beta;-arrestin1 tagged with green fluorescent protein (&beta;-arr-GFP) and transfected the both plasmids into Rat Basophilic Leukomia (RBL-2H3) cell lines18-19. The kinetics of interaction between these proteins and localization were monitored using live cell video microscopy. The methodologies in the current paper describe the use of microscopic techniques to investigate the functional responses of G-protein coupled receptors in live cells. The current paper also describes the use of Metamorph software to quantify the fluorescence intensities to determine the kinetics of receptor and cytosolic protein interactions.

Real-time Imaging of Leukotriene B4 Mediated Cell Migration and BLT1 Interactions with &#946;-arrestin

This paper describes the methodology to determine the chemotactic response of leukocytes to specific ligands and identify interactions between the cell surface receptors and cytosolic proteins using live cell imaging techniques.

בזמן אמת הדמיה של leukotriene B 4 Cell Migration מתווכת ו BLT1 אינטראקציות עם β-arrestin

G-protein coupled receptors (GPCRs) belong to the seven transmembrane protein family and mediate the transduction of extracellular signals to ...

Competitive Homing Assays to Study Gut-tropic T Cell Migration

In order to exert their function lymphocytes need to leave the blood and migrate into different tissues in the body. Lymphocyte adhesion to endothelial cells and tissue extravasation is a multistep process controlled by different adhesion molecules (homing receptors) expressed on lymphocytes and their respective ligands (addressins) displayed on endothelial cells 1 2. Even though the function of these adhesion receptors can be partially studied ex vivo, the ultimate test for their physiological relevance is to assess their role during in vivo lymphocyte adhesion and migration. Two complementary strategies have been used for this purpose: intravital microscopy (IVM) and homing experiments. Although IVM has been essential to define the precise contribution of specific adhesion receptors during the adhesion cascade in real time and in different tissues, IVM is time consuming and labor intensive, it often requires the development of sophisticated surgical techniques, it needs prior isolation of homogeneous cell populations and it permits the analysis of only one tissue/organ at any given time. By contrast, competitive homing experiments allow the direct and simultaneous comparison in the migration of two (or even more) cell subsets in the same mouse and they also permit the analysis of many tissues and of a high number of cells in the same experiment.
Here we describe the classical competitive homing protocol used to determine the advantage/disadvantage of a given cell type to home to specific tissues as compared to a control cell population. We chose to illustrate the migratory properties of gut-tropic versus non gut-tropic T cells, because the intestinal mucosa is the largest body surface in contact with the external environment and it is also the extra-lymphoid tissue with the best-defined migratory requirements. Moreover, recent work has determined that the vitamin A metabolite all-trans retinoic acid (RA) is the main molecular mechanism responsible for inducing gut-specific adhesion receptors (integrin a4b7and chemokine receptor CCR9) on lymphocytes. Thus, we can readily generate large numbers of gut-tropic and non gut-tropic lymphocytes ex vivoby activating T cells in the presence or absence of RA, respectively, which can be finally used in the competitive homing experiments described here.

Competitive homing experiments allow to directly assessing the migratory properties of two different cell populations in a single mouse. Here we illustrate this procedure by comparing the migration of ex vivo-generated gut-tropic versus non-gut tropic T cells.

מבחני ביות תחרותי לחקר נדידת גוט-טרופי T Cell

In order to exert their function lymphocytes need to leave the blood and migrate into different tissues in the body. Lymphocyte adhesion to endothelial ...

Optimized Protocol for Efficient Transfection of Dendritic Cells without Cell Maturation

Dendritic cells (DCs) can be considered sentinels of the immune system which play a critical role in its initiation and response to infection1. Detection of pathogenic antigen by na&iuml;ve DCs is through pattern recognition receptors (PRRs) which are able to recognize specific conserved structures referred to as pathogen-associated molecular patterns (PAMPS). Detection of PAMPs by DCs triggers an intracellular signaling cascade resulting in their activation and transformation to mature DCs. This process is typically characterized by production of type 1 interferon along with other proinflammatory cytokines, upregulation of cell surface markers such as MHCII and CD86 and migration of the mature DC to draining lymph nodes, where interaction with T cells initiates the adaptive immune response2,3. Thus, DCs link the innate and adaptive immune systems. 
The ability to dissect the molecular networks underlying DC response to various pathogens is crucial to a better understanding of the regulation of these signaling pathways and their induced genes. It should also help facilitate the development of DC-based vaccines against infectious diseases and tumors. However, this line of research has been severely impeded by the difficulty of transfecting primary DCs4.
Virus transduction methods, such as the lentiviral system, are typically used, but carry many limitations such as complexity and bio-hazardous risk (with the associated costs)5,6,7,8. Additionally, the delivery of viral gene products increases the immunogenicity of those transduced DCs9,10,11,12. Electroporation has been used with mixed results13,14,15, but we are the first to report the use of a high-throughput transfection protocol and conclusively demonstrate its utility.
In this report we summarize an optimized commercial protocol for high-throughput transfection of human primary DCs, with limited cell toxicity and an absence of DC maturation16. Transfection efficiency (of GFP plasmid) and cell viability were more than 50% and 70% respectively. FACS analysis established the absence of increase in expression of the maturation markers CD86 and MHCII in transfected cells, while qRT-PCR demonstrated no upregulation of IFN&beta;. Using this electroporation protocol, we provide evidence for successful transfection of DCs with siRNA and effective knock down of targeted gene RIG-I, a key viral recognition receptor16,17, at both the mRNA and protein levels.

We present our optimized high-throughput nucleofection protocol as an efficient way of transfecting primary human monocyte-derived dendritic cells with either plasmid DNA or siRNA without causing cell maturation. We further provide evidence for successful siRNA silencing of targeted gene RIG-I at both the mRNA and protein levels.

פרוטוקול אופטימיזציה עבור transfection יעילה של תאים דנדריטים ללא ההבשלה Cell

Dendritic cells (DCs) can be considered sentinels of the immune system which play a critical role in its initiation and response to infection1. Detection ...

Sample Preparation of Mycobacterium tuberculosis Extracts for Nuclear Magnetic Resonance Metabolomic Studies

Mycobacterium tuberculosis is a major cause of mortality in human beings on a global scale. The emergence of both multi- (MDR) and extensively-(XDR) drug-resistant strains threatens to derail current disease control efforts. Thus, there is an urgent need to develop drugs and vaccines that are more effective than those currently available. The genome of M. tuberculosis has been known for more than 10 years, yet there are important gaps in our knowledge of gene function and essentiality. Many studies have since used gene expression analysis at both the transcriptomic and proteomic levels to determine the effects of drugs, oxidants, and growth conditions on the global patterns of gene expression. Ultimately, the final response of these changes is reflected in the metabolic composition of the bacterium including a few thousand small molecular weight chemicals. Comparing the metabolic profiles of wild type and mutant strains, either untreated or treated with a particular drug, can effectively allow target identification and may lead to the development of novel inhibitors with anti-tubercular activity. Likewise, the effects of two or more conditions on the metabolome can also be assessed. Nuclear magnetic resonance (NMR) is a powerful technology that is used to identify and quantify metabolic intermediates. In this protocol, procedures for the preparation of M. tuberculosis cell extracts for NMR metabolomic analysis are described. Cell cultures are grown under appropriate conditions and required Biosafety Level 3 containment,1 harvested, and subjected to mechanical lysis while maintaining cold temperatures to maximize preservation of metabolites. Cell lysates are recovered, filtered sterilized, and stored at ultra-low temperatures. Aliquots from these cell extracts are plated on Middlebrook 7H9 agar for colony-forming units to verify absence of viable cells. Upon two months of incubation at 37 &deg;C, if no viable colonies are observed, samples are removed from the containment facility for downstream processing. Extracts are lyophilized, resuspended in deuterated buffer and injected in the NMR instrument, capturing spectroscopic data that is then subjected to statistical analysis. The procedures described can be applied for both one-dimensional (1D) 1H NMR and two-dimensional (2D) 1H-13C NMR analyses. This methodology provides more reliable small molecular weight metabolite identification and more reliable and sensitive quantitative analyses of cell extract metabolic compositions than chromatographic methods. Variations of the procedure described following the cell lysis step can also be adapted for parallel proteomic analysis.

Sample Preparation of Mycobacterium tuberculosis Extracts for Nuclear Magnetic Resonance Metabolomic Studies

The metabolomic profile of Mycobacterium tuberculosis is determined after growth in broth cultures. Conditions can be varied to test the effects of nutritional supplements, oxidants, and anti-tuberculosis agents on the metabolic profile of this microorganism. Procedure for extract preparation is applicable for both 1D 1H and 2D 1H-13C NMR analyses.

לדוגמא הכנה של<em&gt; Mycobacterium tuberculosis</em&gt; תמציות ללימודי metabolomic תהודה מגנטיים גרעיניים

Mycobacterium tuberculosis is a major cause of mortality in human beings on a global scale. The emergence of both multi- (MDR) and extensively-(XDR) ...

Analysis of Pulmonary Dendritic Cell Maturation and Migration during Allergic Airway Inflammation

Dendritic cells (DCs) are the key players involved in initiation of adaptive immune response by activating antigen-specific T cells. DCs are present in peripheral tissues in steady state; however in response to antigen stimulation, DCs take up the antigen and rapidly migrate to the draining lymph nodes where they initiate T cell response against the antigen1,2. Additionally, DCs also play a key role in initiating autoimmune as well as allergic immune response3.
DCs play an essential role in both initiation of immune response and induction of tolerance in the setting of lung environment4. Lung environment is largely tolerogenic, owing to the exposure to vast array of environmental antigens5. However, in some individuals there is a break in tolerance, which leads to induction of allergy and asthma. In this study, we describe a strategy, which can be used to monitor airway DC maturation and migration in response to the antigen used for sensitization. The measurement of airway DC maturation and migration allows for assessment of the kinetics of immune response during airway allergic inflammation and also assists in understanding the magnitude of the subsequent immune response along with the underlying mechanisms.
Our strategy is based on the use of ovalbumin as a sensitizing agent. Ovalbumin-induced allergic asthma is a widely used model to reproduce the airway eosinophilia, pulmonary inflammation and elevated IgE levels found during asthma6,7. After sensitization, mice are challenged by intranasal delivery of FITC labeled ovalbumin, which allows for specific labeling of airway DCs which uptake ovalbumin. Next, using several DC specific markers, we can assess the maturation of these DCs and can also assess their migration to the draining lymph nodes by employing flow cytometry.

We describe a strategy to monitor maturation and migration of pulmonary dendritic cells in response to ovalbumin in the setting of ovalbumin induced allergic airway inflammation. This strategy can be modified to assess migration of pulmonary dendritic cells in settings of infection.

ניתוח של התבגרות ריאתי Cell Migration הדנדריטים ובמהלך דלקת אלרגית Airway

Dendritic cells (DCs) are the key players involved in initiation of adaptive immune response by activating antigen-specific T cells. DCs are present in ...

Generation of a Novel Dendritic-cell Vaccine Using Melanoma and Squamous Cancer Stem Cells

We identified cancer stem cell (CSC)-enriched populations from murine melanoma D5 syngeneic to C57BL/6 mice and the squamous cancer SCC7 syngeneic to C3H mice using ALDEFLUOR/ALDH as a marker, and tested their immunogenicity using the cell lysate as a source of antigens to pulse dendritic cells (DCs). DCs pulsed with ALDHhigh CSC lysates induced significantly higher protective antitumor immunity than DCs pulsed with the lysates of unsorted whole tumor cell lysates in both models and in a lung metastasis setting and a s.c.&#160;tumor growth setting, respectively. This phenomenon was due to CSC vaccine-induced humoral as well as cellular anti-CSC responses. In particular, splenocytes isolated from the host subjected to CSC-DC vaccine produced significantly higher amount of IFN&#947; and GM-CSF than splenocytes isolated from the host subjected to unsorted tumor cell lysate pulsed-DC vaccine. These results support the efforts to develop an autologous CSC-based therapeutic vaccine for clinical use in an adjuvant setting.

Evaluated in syngeneic immunocompetent hosts, cancer stem cell (CSC) based dendritic cell (DC) vaccine demonstrated significantly higher antitumor immunity than traditional DC vaccines pulsed with heterogeneous bulk tumor cells.

יצירת חיסון חדשני לתאים דנדריטיים באמצעות מלנומה ותאי גזע סרטניים קשקשיים

We identified cancer stem cell (CSC)-enriched populations from murine melanoma D5 syngeneic to C57BL/6 mice and the squamous cancer SCC7 syngeneic to C3H ...

Imaging CD4 T Cell Interstitial Migration in the Inflamed Dermis

The ability of CD4 T cells to carry out effector functions is dependent upon the rapid and efficient migration of these cells in inflamed peripheral tissues through an as-yet undefined mechanism. The application of multiphoton microscopy to the study of the immune system provides a tool to measure the dynamics of immune responses within intact tissues. Here we present a protocol for non-invasive intravital multiphoton imaging of CD4 T cells in the inflamed mouse ear dermis. Use of a custom imaging platform and a venous catheter allows for the visualization of CD4 T cell dynamics in the dermal interstitium, with the ability to interrogate these cells in real-time via the addition of blocking antibodies to key molecular components involved in motility. This system provides advantages over both in vitro models and surgically invasive imaging procedures. Understanding the pathways used by CD4 T cells for motility may ultimately provide insight into the basic function of CD4 T cells as well as the pathogenesis of both autoimmune diseases and pathology from chronic infections.

The mechanisms that govern the interstitial motility of CD4 effector T cells at sites of inflammation are relatively unknown. We present a non-invasive approach to visualize and manipulate in vitro-primed CD4 T cells in the inflamed ear dermis, allowing for study of the dynamic behavior of these cells in situ.

הדמית תא CD4 T גירת ביניים בדרמיס המוסת

The ability of CD4 T cells to carry out effector functions is dependent upon the rapid and efficient migration of these cells in inflamed peripheral ...

A CFSE-based Assay to Study the Migration of Murine Skin Dendritic Cells into Draining Lymph Nodes During Infection with Mycobacterium bovis Bacille Calmette-Gu&#233;rin

Dendritic cells (DCs) are important for initiating immune responses, in part through their ability to acquire and shuttle antigen to the draining lymph node (DLN). The mobilization of DCs to the DLN is complex and remains to be fully elucidated during infection. Herein described is the use of an innovative, simple assay that relies on the fluorochrome 5- and 6-carboxyfluorescein diacetate succinimidyl ester (CFSE) to track the migration of DCs during footpad infection with Mycobacterium bovis Bacille Calmette-Gu&#233;rin (BCG) in C57BL/6 mice. This assay enables the characterization of skin DC sub-populations that actively relocate to the draining, popliteal LN in response to BCG. This protocol originates from a BCG model where migratory skin DCs were identified by flow cytometry. The assay is amiable to the study and identification of DCs or other cells that home to the popliteal LN after inoculation of microbes, their metabolites or other inflammatory stimuli in the footpad, and consequently to study factors that regulate the migration of these cells.

An assay in mice to track cell migration from skin to draining lymph node is described which enables the characterization of skin Dendritic cells mobilized to the lymph node after footpad infection with Bacille Calmette-Gu&#233;rin.

Assay CFSE המבוסס לחקר נדידת תאי דנדריטים עור Murine לתוך ניקוז בלוטות הלימפה במהלך זיהום<em&gt; Mycobacterium בוביס</em&gt; Bacille Calmette-גרן

Dendritic cells (DCs) are important for initiating immune responses, in part through their ability to acquire and shuttle antigen to the draining lymph ...

Measurement of T Cell Alloreactivity Using Imaging Flow Cytometry

The measurement of immunological reactivity to donor antigens in transplant recipients is likely to be crucial for the successful reduction or withdrawal of immunosuppression. The mixed leukocyte reaction (MLR), limiting dilution assays, and trans-vivo delayed-type hypersensitivity (DTH) assay have all been applied to this question, but these methods have limited predictive ability and/or significant practical limitations that reduce their usefulness. Imaging flow cytometry is a technique that combines the multiparametric quantitative powers of flow cytometry with the imaging capabilities of fluorescent microscopy. We recently made use of an imaging flow cytometry approach to define the proportion of recipient T cells capable of forming mature immune synapses with donor antigen-presenting cells (APCs). Using a well-characterized mouse heart transplant model, we have shown that the frequency of in vitro immune synapses among T-APC membrane contact events strongly predicted allograft outcome in rejection, tolerance, and a situation where transplant survival depends on induced regulatory T cells. The frequency of T-APC contacts increased with T cells from mice during acute rejection and decreased with T cells from mice rendered unresponsive to alloantigen. The addition of regulatory T cells to the in vitro system reduced prolonged T-APC contacts. Critically, this effect was also seen with human polyclonally expanded, naturally occurring regulatory T cells, which are known to control the rejection of human tissues in humanized mouse models. Further development of this approach may allow for a deeper characterization of the alloreactive T-cell compartment in transplant recipients. In the future, further development and evaluation of this method using human cells may form the basis for assays used to select patients for immunosuppression minimization, and it can be used to measure the impact of tolerogenic therapies in the clinic.

This paper describes a method for measuring alloreactivity in a mixed population of T cells using imaging flow cytometry.

מדידת T Cell Alloreactivity שימוש cytometry זרימה הדמיה

The measurement of immunological reactivity to donor antigens in transplant recipients is likely to be crucial for the successful reduction or withdrawal ...

נדידת תאים דנדריטים ניטור באמצעות

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לא פולשני הדמיה של ביות ליקוציט והגירה In vivo

בזמן אמת הדמיה של leukotriene B₄ Cell Migration מתווכת ו BLT1 אינטראקציות עם β-arrestin