עבודה זו נתמכה על ידי מענק לחוקרים מתקדמים מהשויצרי הקרן הלאומית למדע ובאמצעות מענקים מNYSTEM (C026446; C026447) והיוזמה Tri-המוסדית בתאי גזע (סטאר קרן).

<ol>
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יש המחברים אין אינטרסים מנוגדים לחשוף.

לבידול המוצלח של תאי R-NC מhESC / hiPSCs השיקולים הבאים צריכים להיעשות. זה קריטי כדי לעבוד בתנאים סטריליים תרבות בכל העת. בפרט, חשוב לבחון תרבויות hPSC לזיהום Mycoplasma באופן קבוע, שכן זיהום זה יפריע בידול מוצלח, אבל לא יכול בקלות להיות מזוהה מבחינה ויזואלית בתרבויות hPSC. בידול R-NC צר...

תאי גזע עובריים אנושיים (hESC) ותאי גזע pluripotent מושרה (hiPSC) הראו פוטנציאל עצום, בפרט לבירור ולטיפול עתידי במחלות בבני אדם שלמודלים של בעלי חיים לא טובים ולא רקמות עיקריות זמינות. דוגמאות יישום לטכנולוגית hESC / hiPSC הן כדלקמן: תאים בעלי עניין מיוחד ניתן להפיק מן hESC / hiPSCs לרפואת רגנרטיבית בכמות בלתי מוגבלת 1. יכולים להיות מיוצרים בתאים של חולים שנשאו מחלה ספציפית ושימשו להקמה במודלי מחלה מבחנה 2,3. מודלים מחלה כזו אז יכול להיות מועסק להקרנת סמים בקנה מידה גדולה בחיפוש אחר תרכובות תרופה חדשות 4, כמו גם בדיקות של תרופות קיימות ליעילות ורעיל 5. במבחנה מודלים מחלה יכולים להוביל לזיהוי מנגנוני מחלה רומן. עבור כל היישומים של טכנולוגית hESC / iPSC חשוב לעבוד עם מסוים, גם להגדיר-סוגי תאי ד המושפעים במחלה של עניין. לפיכך, על זמינותו של במבחנה פרוטוקולי בידול מוצקים ושחזור היא חיונית עבור כל היישומים של טכנולוגית hESC / hiPSC. פרוטוקולים רצויים שמראה השתנות מינימאלית, הוצאות זמן, מאמץ, קושי ועלות, כמו גם שחזור מקסימאלי בין קווי hESC / hiPSC וחוקרים שונים. תאי רכס עצבי (NC) לצוץ במהלך neurulation חוליות בין האפידרמיס ואפיתל העצבי. הם להתרבות ולהעביר באופן נרחב ברחבי העובר המתפתח ולהצמיח מגוון מרשים של סוגי תאי צאצאים, כוללים עצם / סחוס, שלד craniofacial, עצבים חושיים, תאי שוואן, מלנוציטים, תאי שריר חלק, תאי עצב enteric, הנוירונים אוטונומיים, תאי chromaffin , תאי מחיצת לב, שיניים ובלוטות יותרת הכליה תאים / בלוטת התריס 6. לכן, תאי NC הם סוג תא אטרקטיבי עבור שדה תאי גזע וחשוב עבורמודלים של מגוון רחב של מחלות, כגון מחלת הירשפרונג 7, המשפחתי דיסאוטונומיה 8, כמו גם סוגי סרטן כגון נוירובלסטומה 9. יתר על כן, הם מציעים את האפשרות ללמוד היבטים של התפתחות עוברית אנושית במבחנה. זמין כרגע ומיושמים באופן נרחב בפרוטוקול בידול מבחנה להפקת תאי NC מhESCs 10,11 דורש עד 35 ימים של בידול וזה כרוך באינדוקציה עצבית בתאים מזינים סטרומה כגון תאי MS5 ומתבצע כך בתנאים מוגדרים היטב. למרות שזה יכול להיות עד בקנה מידה כדי לייצר כמויות גדולות של תאי NC, למשל נדרש להקרנת סמים תפוקה גבוהה 4, זה עבודה ועלות אינטנסיבית. יתר על כן, היא כרוכה passaging הידני של רוזטות העצבית, שיכול להיות קשה ללהתרבות ולכן כפופה לשונות הכוללות, בפרט כאשר הוא מוחל על מגוון גדול של hESC או hiPSCקווים. הנה, את הגזירה בשלבים של תאי NC בפרוטוקול 18 יום שהוא ללא תאים מזינים מוצגת. שיטה זו היא קצרה יותר ומוגדרת יותר מאשר הפרוטוקול המשמש כיום. יתר על כן, זה מאוד חזק ביצירת תאי NC בין קווי hiPSC שונים. חשוב מכך, הוא הראה כי תאי NC הניבו ידי שני הפרוטוקולים מופיעים בגבול של רוזטות העצבית (שושנה-NC מכונה להלן או R-NC). התאים שמקורם באחת משני הפרוטוקולים נראים מורפולוגית זהים, הם מבטאים את אותו סמני NC ולהתקבץ יחדיו בניתוח microarray. תאי NC נגזרים באמצעות הפרוטוקול החדש (R-NC) הם פונקציונליים, בדומה לתאי NC נגזרים באמצעות הפרוטוקול הישן (MS5-R-NC) באופן שהם יכולים להעביר ועוד להתמיין לתאי עצב. לכן, ניתן להשתמש בתאים במקביל לתאי MS5-R-NC. פרוטוקול תא R-NC לגזירה של תאי NC מhESC / iPSC יהיה שימושי עבור כל היישומים של טכנולוגית hESC / iPSC מעורב שושלת NC. &lt;/ P&gt;

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			<td height="21" style="height:21px;width:353px;">Regents</td>
			<td style="width:219px;">company</td>
			<td style="width:160px;">cataloge number</td>
			<td style="width:165px;">comments</td>
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			<td height="21" style="height:21px;"></td>
			<td></td>
			<td></td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;">DMEM</td>
			<td>Gibco-Life Technologies</td>
			<td>11965-092</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Fetal Bovine Serum (FBS)</td>
			<td>Atlanta Biologicals</td>
			<td>S11150</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">DMEM/F12</td>
			<td>Gibco-Life Technologies</td>
			<td>11330-032</td>
			<td></td>
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		<tr height="20">
			<td height="20" style="height:20px;">Knockout Serum Replacement</td>
			<td>Gibco-Life Technologies</td>
			<td>10828-028</td>
			<td>Lot should be tested</td>
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		<tr height="20">
			<td height="20" style="height:20px;">L-Glutamine</td>
			<td>Gibco-Life Technologies</td>
			<td>25030-081</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Penicinlin/Streptomycin</td>
			<td>Gibco-Life Technologies</td>
			<td>15140-122</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">MEM minimum essential amino acids solution&#160;</td>
			<td>Gibco-Life Technologies</td>
			<td>11140-050</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">&#946;-Mercaptoethanol&#160;</td>
			<td>Gibco-Life Technologies</td>
			<td>21985-023</td>
			<td>toxic</td>
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		<tr height="20">
			<td height="20" style="height:20px;">Recombinant human FGF basic (FGF2)</td>
			<td>R&#38;D Systems</td>
			<td>233-FB-001MG/CF</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Knockout DMEM</td>
			<td>Gibco-Life Technologies</td>
			<td>10829-018</td>
			<td></td>
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			<td height="20" style="height:20px;">DMEM/F12 powder&#160;</td>
			<td>Invitrogen</td>
			<td>12500-096</td>
			<td></td>
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		<tr height="20">
			<td height="20" style="height:20px;">Glucose</td>
			<td>Sigma</td>
			<td>G7021</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Sodium Bicarbonate&#160;</td>
			<td>Sigma</td>
			<td>S5761</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">APO human transferrin</td>
			<td>Sigma</td>
			<td>T1147</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Human insulin&#160;</td>
			<td>Sigma</td>
			<td>A4034</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Putriscine dihydrochloride</td>
			<td>Sigma</td>
			<td>P5780</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Selenite</td>
			<td>Sigma</td>
			<td>S5261</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Progesterone</td>
			<td>Sigma</td>
			<td>P8783</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Matrigel matrix</td>
			<td>BD Biosciences</td>
			<td>354234</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Poly-L Ornithin hydrobromide</td>
			<td>Sigma</td>
			<td>P3655</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Mouse Laminin-I</td>
			<td>R&#38;D Systems</td>
			<td>3400-010-01</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Fibronectin</td>
			<td>BD Biosciences</td>
			<td>356008</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Dispase in Hank&#39;s Balanced Salt Solution 5U/ml</td>
			<td>Stem Cell Technologies</td>
			<td>7013</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Trypsin-EDTA&#160;</td>
			<td>Gibco-Life Technologies</td>
			<td>25300-054</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Y-27632 dihydrochloride</td>
			<td>Tocris-R&#38;D Systems</td>
			<td>1254</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">LDN193189</td>
			<td>Stemgent</td>
			<td>04-0074</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">SB431542</td>
			<td>Tocris-R&#38;D Systems</td>
			<td>1614</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Accutase</td>
			<td>Innovative Cell Technologies</td>
			<td>AT104</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Ascorbic Acid&#160;</td>
			<td>Sigma</td>
			<td>A4034</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">BDNF</td>
			<td>R&#38;D Systems</td>
			<td>248-BD</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">FGF8</td>
			<td>R&#38;D Systems</td>
			<td>423-F8</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Mouse recombinant sonic hedgehog (SHH)</td>
			<td>R&#38;D Systems</td>
			<td>464SH</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Fetal Bovine Serum (FBS)</td>
			<td>Atlanta Biologicals</td>
			<td>S11150</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">HBSS</td>
			<td>Gibco-Life Technologies</td>
			<td>14170-112</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">HEPES</td>
			<td>Gibco-Life Technologies</td>
			<td>1563-080</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Human recombinant EGF</td>
			<td>R&#38;D Systems</td>
			<td>236EG</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">gelatin (PBS without Mg/Ca)</td>
			<td>in house</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;"></td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Antibodies:</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Anti HNK-1/N-Cam (CD57) mIgM</td>
			<td>Sigma</td>
			<td>C6680-100TST</td>
			<td>lot should be tested</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Anti-p75 mIgG1 (Nerve Growth factor receptor)</td>
			<td>Advanced Targeting Systems</td>
			<td>AB-N07</td>
			<td>lot should be tested</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">APC rat anti-mIgM</td>
			<td>BD Parmingen</td>
			<td>550676</td>
			<td>lot should be tested</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">AlexaFluor 488 goat anti-mouse IgG1&#160;</td>
			<td>Invitrogen</td>
			<td>A21121</td>
			<td>lot should be tested</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Anti Oct4 mIgG2b (used at 1:200 dilution)</td>
			<td>Santa Cruz</td>
			<td>sc-5279</td>
			<td>lot should be tested</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;"></td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Material/Equipment:</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Mouse embryonic fibroblasts (7 million cells/vial)</td>
			<td>GlobalStem</td>
			<td>GSC-6105M</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Cell culture dishes: 10cm and 15 cm plates, centrifuge tubes, FACS tubes,&#160; pipetts, pipet tips</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Glass hematocytometer</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Cell culture centrifuge</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Cell culture incubator (CO2, humidity and temperature controlled)</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Cell culture laminar flow hood with embedded microscope</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Cell culture biosafety hood</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Cell sorting machine, i.e. MoFlo</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Inverted microscope</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">1 ml TB syringe 27Gx1/2</td>
			<td>BD Biosciences</td>
			<td>309623</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Cell lifter Polyethylene</td>
			<td>Corning Incorporated</td>
			<td>3008</td>
			<td></td>
		</tr>
	</tbody>
</table>

feeder-free derivation of neural crest progenitor cells from human pluripotent stem cells

תאים אנושיים גזע pluripotent (hPSCs) יש פוטנציאל גדול ללימוד התפתחות עוברית אנושית, לדוגמנות מחלות אנושיות בצלחת וכמקור לתאים להשתלה, שיישומי משובי לאחר מחלה או תאונה. תאים עצביים לפסגה (NC) הם סימנים מקדימים למגוון גדול של תאים סומטיים בוגרים, כגון תאים ממערכת העצבים ההיקפית וגליה, מלנוציטים ותאי mesenchymal. הם מקור חשוב של תאים ללמוד היבטים של התפתחות עוברית אנושית, כוללים מפרט גורל תא והגירה. הבחנה נוספת של תאי אב NC לסוגי הבדיל סופני סלולריים מציעה את האפשרות למודל מחלות אנושיות במבחנה, לחקור מנגנוני מחלה וליצור תאים לרפואת רגנרטיבית. מאמר זה מציג את העיבוד של במבחנה פרוטוקול בידול זמין כרגע להפקת תאי NC מhPSCs. פרוטוקול חדש זה דורש 18 ימי differentiation, כלומר, להרחבה בקלות ושחזור מאוד בין תאי גזע עובריים אנושיים קווים (hESC), כמו גם בתאי גזע pluripotent אדם הנגרם על קווים (hiPSC) ללא מזין. שני פרוטוקולים הישנים וחדשים יניבו תאי NC של זהות שווה.

שני שיפורים החשובים ביותר של פרוטוקול R-NC על פרוטוקול MS5-R-NC 11 הם, ללא תנאי המזין מוגדר בידול והקיצור הכללי של דרישת הזמן. תאים מזינים MS5 13 הם תאים עכבריים מח עצם נגזרים סטרומה שהוכחו לתמוך בידול עצבי מ14 hESCs. HESCs התרבית בתאים מזינים MS5 במבנים בצפיפות נמוכ?...

Watch this Scientific Journal Video about Feeder-free Derivation of Neural Crest Progenitor Cells from Human Pluripotent Stem Cells at JoVE.com

Feeder-free Derivation of Neural Crest Progenitor Cells from Human Pluripotent Stem Cells

יש תאי רכס עצבי (NC) שמקורם בתאים אנושיים גזע pluripotent (hPSC) פוטנציאל גדול לפיתוח מודלים ומחלות של בני אדם ועבור טיפולי החלפת תא. הנה, הסתגלות מזין ללא ממשמש כיום באופן נרחב<em&gt; במבחנה</em&gt; פרוטוקול בידול לגזירה של תאי NC מhPSCs מוצג.

גזירה ללא מזין של תאים עצביים קרסט אב קדמון מפלוריפוטנטיים אדם בתאי גזע

Human pluripotent stem cells (hPSCs) have great potential for studying human embryonic development, for modeling human diseases in the dish and as a ...

feeder-free-derivation-neural-crest-progenitor-cells-from-human

Research

JoVE Journal

Neuroscience

14.1K Views.  Sloan-Kettering Institute for Cancer Research. יש תאי רכס עצבי (NC) שמקורם בתאים אנושיים גזע pluripotent (hPSC) פוטנציאל גדול לפיתוח מודלים ומחלות של בני אדם ועבור טיפולי החלפת תא. הנה, הסתגלות מזין ללא ממשמש כיום באופן נרחב במבחנה פרוטוקול בידול לגזירה של תאי NC מhPSCs מוצג.

Video: Feeder-free Derivation of Neural Crest Progenitor Cells from Human Pluripotent Stem Cells

Neural-Colony Forming Cell Assay: An Assay To Discriminate Bona Fide Neural Stem Cells from Neural Progenitor Cells

The neurosphere assay (NSA) is one of the most frequently used methods to isolate, expand and also calculate the frequency of neural stem cells (NSCs). Furthermore, this serum-free culture system has also been employed to expand stem cells and determine their frequency from a variety of tumors and normal tissues. It has been shown recently that a one-to-one relationship does not exist between neurosphere formation and NSCs. This suggests that the NSA as currently applied, overestimates the frequency of NSCs in a mixed population of neural precursor cells isolated from both the embryonic and adult mammalian brain. This video practically demonstrates a novel collagen based semi- solid assay, the neural-colony forming cell assay (N-CFCA), which has the ability to discriminate stem from progenitor cells based on their long-term proliferative potential, and thus provides a method to enumerate NSC frequency. In the N-CFCA, colonies &ge;2 mm in diameter are derived from cells that meet all the functional criteria of a NSC, while colonies &lt; 2mm are derived from progenitors. The N-CFCA procedure can be used for cells prepared from different sources including primary and cultured adult or embryonic mouse CNS cells. Here we use cells prepared from passage one neurospheres generated from embryonic day 14 mice brain to perform N-CFCA. The cultures are replenished with proliferation medium every seven days for three weeks to allow the plated cells to exhibit their full proliferative potential and then the frequency of neural progenitor and bona fide neural stem cells is calculated respectively by counting the number of colonies that are &lt; 2mm and the ones that are &ge;2mm in reference to the number of cells that were initially plated.

This video protocol demonstrates how to discriminate and enumerate bona fide neural stem cells in a mixed population of neural precursor cells using the neural colony-forming cell assay.

עצבית, המושבה יצירת Assay נייד: Assay להפלות בונה תאים בתום גזע עצביים מן ובתאים עצבית

The neurosphere assay (NSA) is one of the most frequently used methods to isolate, expand and also calculate the frequency of neural stem cells (NSCs). ...

Live-cell Imaging of Sensory Organ Precursor Cells in Intact Drosophila Pupae

Since the discovery of Green Fluorescent Protein (GFP), there has been a revolutionary change in the use of live-cell imaging as a tool for understanding fundamental biological mechanisms. Striking progress has been particularly evident in Drosophila, whose extensive toolkit of mutants and transgenic lines provides a convenient model to study evolutionarily-conserved developmental and cell biological mechanisms. We are interested in understanding the mechanisms that control cell fate specification in the adult peripheral nervous system (PNS) in Drosophila. Bristles that cover the head, thorax, abdomen, legs and wings of the adult fly are individual mechanosensory organs, and have been studied as a model system for understanding mechanisms of Notch-dependent cell fate decisions. Sensory organ precursor (SOP) cells of the microchaetes (or small bristles), are distributed throughout the epithelium of the pupal thorax, and are specified during the first 12 hours after the onset of pupariation. After specification, the SOP cells begin to divide, segregating the cell fate determinant Numb to one daughter cell during mitosis. Numb functions as a cell-autonomous inhibitor of the Notch signaling pathway.
Here, we show a method to follow protein dynamics in SOP cell and its progeny within the intact pupal thorax using a combination of tissue-specific Gal4 drivers and GFP-tagged fusion proteins 1,2.This technique has the advantage over fixed tissue or cultured explants because it allows us to follow the entire development of an organ from specification of the neural precursor to growth and terminal differentiation of the organ. We can therefore directly correlate changes in cell behavior to changes in terminal differentiation. Moreover, we can combine the live imaging technique with mosaic analysis with a repressible cell marker (MARCM) system to assess the dynamics of tagged proteins in mitotic SOPs under mutant or wildtype conditions. Using this technique, we and others have revealed novel insights into regulation of asymmetric cell division and the control of Notch signaling activation in SOP cells (examples include references 1-6,7 ,8).

Live-cell Imaging of Sensory Organ Precursor Cells in Intact Drosophila Pupae

In this video, we describe a method for live cell imaging of asymmetrically dividing sensory organ progenitor cells and epidermal cells in intact Drosophila pupae

Live-תא הדמיה של תאים מבשר חושי האיברים אינטקט תסיסנית גלמים

Since the discovery of Green Fluorescent Protein (GFP), there has been a revolutionary change in the use of live-cell imaging as a tool for understanding ...

Isolation and Culture of Neural Crest Stem Cells from Human Hair Follicles

Hair follicles undergo lifelong growth and hair cycle is a well-controlled process involving stem cell proliferation and quiescence. Hair bulge is a well-characterized niche for adult stem cells1. This segment of the outer root sheath contains a number of different types of stem cells, including epithelial stem cells2, melanocyte stem cells3 and neural crest like stem cells4-7. Hair follicles represent an accessible and rich source for different types of human stem cells. We and others have isolated neural crest stem cells (NCSCs) from human fetal and adult hair follicles4,5. These human stem cells are label-retaining cells and are capable of self-renewal through asymmetric cell division in vitro. They express immature neural crest cell markers but not differentiation markers. Our expression profiling study showed that they share a similar gene expression pattern with murine skin immature neural crest cells. They exhibit clonal multipotency that can give rise to myogenic, melanocytic, and neuronal cell lineages after in vitro clonal single cell culture. Differentiated cells not only acquire lineage-specific markers but also demonstrate appropriate functions in ex vivo conditions. In addition, these NCSCs show differentiation potential toward mesenchymal lineages. Differentiated neuronal cells can persist in mouse brain and retain neuronal differentiation markers. It has been shown that hair follicle derived NCSCs can help nerve regrowth, and they improve motor function in mice transplanted with these stem cells following transecting spinal cord injury8. Furthermore, peripheral nerves have been repaired with stem cell grafts9, and implantation of skin-derived precursor cells adjacent to crushed sciatic nerves has resulted in remyelination10. Therefore, the hair follicle/skin derived NCSCs have already shown promising results for regenerative therapy in preclinical models.
Somatic cell reprogramming to induced pluripotent stem (iPS) cells has shown enormous potential for regenerative medicine. However, there are still many issues with iPS cells, particularly the long term effect of oncogene/virus integration and potential tumorigenicity of pluripotent stem cells have not been adequately addressed. There are still many hurdles to be overcome before iPS cells can be used for regenerative medicine. Whereas the adult stem cells are known to be safe and they have been used clinically for many years, such as bone marrow transplant. Many patients have already benefited from the treatment. Autologous adult stem cells are still preferred cells for transplantation. Therefore, the readily accessible and expandable adult stem cells in human skin/hair follicles are a valuable source for regenerative medicine.

This article presents a robust protocol for isolation and culture of neural crest stem cells from human hair follicles.

בידוד ותרבות של תאי גזע עצביים קרסט מזקיקי שיער אנושיים

Hair follicles undergo lifelong growth and hair cycle is a well-controlled process involving stem cell proliferation and quiescence. Hair bulge is a ...

Efficient Derivation of Human Neuronal Progenitors and Neurons from Pluripotent Human Embryonic Stem Cells with Small Molecule Induction

There is a large unfulfilled need for a clinically-suitable human neuronal cell source for repair or regeneration of the damaged central nervous system (CNS) structure and circuitry in today's healthcare industry. Cell-based therapies hold great promise to restore the lost nerve tissue and function for CNS disorders. However, cell therapies based on CNS-derived neural stem cells have encountered supply restriction and difficulty to use in the clinical setting due to their limited expansion ability in culture and failing plasticity after extensive passaging1-3. Despite some beneficial outcomes, the CNS-derived human neural stem cells (hNSCs) appear to exert their therapeutic effects primarily by their non-neuronal progenies through producing trophic and neuroprotective molecules to rescue the endogenous cells1-3. Alternatively, pluripotent human embryonic stem cells (hESCs) proffer cures for a wide range of neurological disorders by supplying the diversity of human neuronal cell types in the developing CNS for regeneration1,4-7. However, how to channel the wide differentiation potential of pluripotent hESCs efficiently and predictably to a desired phenotype has been a major challenge for both developmental study and clinical translation. Conventional approaches rely on multi-lineage inclination of pluripotent cells through spontaneous germ layer differentiation, resulting in inefficient and uncontrollable lineage-commitment that is often followed by phenotypic heterogeneity and instability, hence, a high risk of tumorigenicity7-10. In addition, undefined foreign/animal biological supplements and/or feeders that have typically been used for the isolation, expansion, and differentiation of hESCs may make direct use of such cell-specialized grafts in patients problematic11-13. To overcome these obstacles, we have resolved the elements of a defined culture system necessary and sufficient for sustaining the epiblast pluripotence of hESCs, serving as a platform for de novo derivation of clinically-suitable hESCs and effectively directing such hESCs uniformly towards clinically-relevant lineages by small molecules14 (please see a schematic in Fig. 1). Retinoic acid (RA) does not induce neuronal differentiation of undifferentiated hESCs maintained on feeders1, 14. And unlike mouse ESCs, treating hESC-differentiated embryoid bodies (EBs) only slightly increases the low yield of neurons1, 14, 15. However, after screening a variety of small molecules and growth factors, we found that such defined conditions rendered retinoic acid (RA) sufficient to induce the specification of neuroectoderm direct from pluripotent hESCs that further progressed to neuroblasts that generated human neuronal progenitors and neurons in the developing CNS with high efficiency (Fig. 2). We defined conditions for induction of neuroblasts direct from pluripotent hESCs without an intervening multi-lineage embryoid body stage, enabling well-controlled efficient derivation of a large supply of human neuronal cells across the spectrum of developmental stages for cell-based therapeutics.

We have established a protocol for induction of neuroblasts direct from pluripotent human embryonic stem cells maintained under defined conditions with small molecules, which enables derivation of a large supply of human neuronal progenitors and neuronal cell types in the developing CNS for neural repair.

גזירת יעיל של אבות עצב נוירונים האדם מן האדם תאים pluripotent גזע עובריים עם אינדוקציה מולקולה קטנה

There is a large unfulfilled need for a clinically-suitable human neuronal cell source for repair or regeneration of the damaged central nervous system ...

Isolation and Culture of Neural Crest Cells from Embryonic Murine Neural Tube

The embryonic neural crest (NC) is a multipotent progenitor population that originates at the dorsal aspect of the neural tube, undergoes an epithelial to mesenchymal transition (EMT) and migrates throughout the embryo, giving rise to diverse cell types 1-3. NC also has the unique ability to influence the differentiation and maturation of target organs4-6. When explanted in vitro, NC progenitors undergo self-renewal, migrate and differentiate into a variety of tissue types including neurons, glia, smooth muscle cells, cartilage and bone. 
NC multipotency was first described from explants of the avian neural tube7-9. In vitro isolation of NC cells facilitates the study of NC dynamics including proliferation, migration, and multipotency. Further work in the avian and rat systems demonstrated that explanted NC cells retain their NC potential when transplanted back into the embryo10-13. Because these inherent cellular properties are preserved in explanted NC progenitors, the neural tube explant assay provides an attractive option for studying the NC in vitro. 
To attain a better understanding of the mammalian NC, many methods have been employed to isolate NC populations. NC-derived progenitors can be cultured from post-migratory locations in both the embryo and adult to study the dynamics of post-migratory NC progenitors11,14-20, however isolation of NC progenitors as they emigrate from the neural tube provides optimal preservation of NC cell potential and migratory properties13,21,22. Some protocols employ fluorescence activated cell sorting (FACS) to isolate a NC population enriched for particular progenitors11,13,14,17. However, when starting with early stage embryos, cell numbers adequate for analyses are difficult to obtain with FACS, complicating the isolation of early NC populations from individual embryos. Here, we describe an approach that does not rely on FACS and results in an approximately 96% pure NC population based on a Wnt1-Cre activated lineage reporter23. 
The method presented here is adapted from protocols optimized for the culture of rat NC11,13. The advantages of this protocol compared to previous methods are that 1) the cells are not grown on a feeder layer, 2) FACS is not required to obtain a relatively pure NC population, 3) premigratory NC cells are isolated and 4) results are easily quantified. Furthermore, this protocol can be used for isolation of NC from any mutant mouse model, facilitating the study of NC characteristics with different genetic manipulations. The limitation of this approach is that the NC is removed from the context of the embryo, which is known to influence the survival, migration and differentiation of the NC2,24-28.

Isolation of embryonic neural crest from the neural tube facilitates the use of in vitro methods for studying migration, self-renewal, and multipotency of neural crest.

בידוד והתרבות של תאים עצביים לפסגה מהצינור עובריים עצבית Murine

The embryonic neural crest (NC) is a multipotent progenitor population that originates at the dorsal aspect of the neural tube, undergoes an epithelial to ...

The Specification of Telencephalic Glutamatergic Neurons from Human Pluripotent Stem Cells

Here, a stepwise procedure for efficiently generating telencephalic glutamatergic neurons from human pluripotent stem cells (PSCs) has been described. The differentiation process is initiated by breaking the human PSCs into clumps which round up to form aggregates when the cells are placed in a suspension culture. The aggregates are then grown in hESC medium from days 1-4 to allow for spontaneous differentiation. During this time, the cells have the capacity to become any of the three germ layers. From days 5-8, the cells are placed in a neural induction medium to push them into the neural lineage. Around day 8, the cells are allowed to attach onto 6 well plates and differentiate during which time the neuroepithelial cells form. These neuroepithelial cells can be isolated at day 17. The cells can then be kept as neurospheres until they are ready to be plated onto coverslips. Using a basic medium without any caudalizing factors, neuroepithelial cells are specified into telencephalic precursors, which can then be further differentiated into dorsal telencephalic progenitors and glutamatergic neurons efficiently. Overall, our system provides a tool to generate human glutamatergic neurons for researchers to study the development of these neurons and the diseases which affect them.

This procedure yields telencephalic neurons by going through checkpoints which are similar to those observed during human development. The cells are allowed to spontaneously differentiate, are exposed to factors which push them towards the neural lineage, are isolated, and are plated onto coverslips to allow for terminal differentiation and maturation.

המפרט של נוירונים glutamatergic Telencephalic מתאי גזע pluripotent אדם

Here, a stepwise procedure for efficiently generating telencephalic glutamatergic neurons from human pluripotent stem cells (PSCs) has been described. The ...

A cGMP-applicable Expansion Method for Aggregates of Human Neural Stem and Progenitor Cells Derived From Pluripotent Stem Cells or Fetal Brain Tissue

A cell expansion technique to amass large numbers of cells from a single specimen for research experiments and clinical trials would greatly benefit the stem cell community. Many current expansion methods are laborious and costly, and those involving complete dissociation may cause several stem and progenitor cell types to undergo differentiation or early senescence. To overcome these problems, we have developed an automated mechanical passaging method referred to as &#8220;chopping&#8221; that is simple and inexpensive. This technique avoids chemical or enzymatic dissociation into single cells and instead allows for the large-scale expansion of suspended, spheroid cultures that maintain constant cell/cell contact. The chopping method has primarily been used for fetal brain-derived neural progenitor cells or neurospheres, and has recently been published for use with neural stem cells derived from embryonic and induced pluripotent stem cells. The procedure involves seeding neurospheres onto a tissue culture Petri dish and subsequently passing a sharp, sterile blade through the cells effectively automating the tedious process of manually mechanically dissociating each sphere. Suspending cells in culture provides a favorable surface area-to-volume ratio; as over 500,000 cells can be grown within a single neurosphere of less than 0.5 mm in diameter. In one T175 flask, over 50 million cells can grow in suspension cultures compared to only 15 million in adherent cultures. Importantly, the chopping procedure has been used under current good manufacturing practice (cGMP), permitting mass quantity production of clinical-grade cell products.

This protocol describes a novel mechanical chopping method that allows the expansion of spherical neural stem and progenitor cell aggregates without dissociation to a single cell suspension.&#160; Maintaining cell/cell contact allows rapid and stable growth for over 40 passages.

שיטת הרחבת cGMP-ישימה עבור מצרפים של עצבי אנושי ותאים שמקורם בתאי גזע pluripotent או רקמת מוח עוברית

A cell expansion technique to amass large numbers of cells from a single specimen for research experiments and clinical trials would greatly benefit the ...

Directed Dopaminergic Neuron Differentiation from Human Pluripotent Stem Cells

Dopaminergic (DA) neurons in the substantia nigra pars compacta (also known as A9 DA neurons) are the specific cell type that is lost in Parkinson&#8217;s disease (PD). There is great interest in deriving A9 DA neurons from human pluripotent stem cells (hPSCs) for regenerative cell replacement therapy for PD. During neural development, A9 DA neurons originate from the floor plate (FP) precursors located at the ventral midline of the central nervous system. Here, we optimized the culture conditions for the stepwise differentiation of hPSCs to A9 DA neurons, which mimics embryonic DA neuron development. In our protocol, we first describe the efficient generation of FP precursor cells from hPSCs using a small molecule method, and then convert the FP cells to A9 DA neurons, which could be maintained in vitro for several months. This efficient, repeatable and controllable protocol works well in human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs) from normal persons and PD patients, in which one could derive A9 DA neurons to perform in vitro disease modeling and drug screening and in vivo cell transplantation therapy for PD.

We, based on knowledge from developmental biology and published research, developed an optimized protocol to efficiently generate A9 midbrain dopaminergic neurons from both human embryonic stem cells and human induced pluripotent stem cells, which would be useful for disease modeling and cell replacement therapy for Parkinson&#8217;s disease.

בימוי דופאמין Neuron בידול מתאי גזע pluripotent האדם

Dopaminergic (DA) neurons in the substantia nigra pars compacta  (also known as A9 DA neurons) are the specific cell type that is lost in ...

Derivation of Adult Human Fibroblasts and their Direct Conversion into Expandable Neural Progenitor Cells

Generation of&#160;induced pluripotent stem cell (iPSCs) from adult skin fibroblasts and subsequent differentiation into somatic cells provides fascinating prospects for the derivation of autologous transplants that circumvent histocompatibility barriers. However, progression through a pluripotent state and subsequent complete differentiation into desired lineages remains a roadblock for the clinical translation of iPSC technology because of the associated neoplastic potential and genomic instability. Recently, we and others showed that somatic cells cannot only be converted into iPSCs but also into different types of multipotent somatic stem cells by using defined factors, thereby circumventing progression through the pluripotent state. In particular, the direct conversion of human fibroblasts into induced neural progenitor cells (iNPCs) heralds the possibility of a novel autologous cell source for various applications such as cell replacement, disease modeling and drug screening. Here, we describe the isolation of adult human primary fibroblasts by skin biopsy and their efficient direct conversion into iNPCs by timely restricted expression of Oct4, Sox2, Klf4, as well as c-Myc. Sox2-positive neuroepithelial colonies appear after 17 days of induction and iNPC lines can be established efficiently by monoclonal isolation and expansion. Precise adjustment of viral multiplicity of infection and supplementation of leukemia inhibitory factor during the induction phase represent critical factors to achieve conversion efficiencies of up to 0.2%. Thus far, patient-specific iNPC lines could be expanded for more than 12 passages and uniformly display morphological and molecular features of neural stem/progenitor cells, such as the expression of Nestin and Sox2. The iNPC lines can be differentiated into neurons and astrocytes as judged by staining against TUJ1 and GFAP, respectively. In conclusion, we report a robust protocol for the derivation and direct conversion of human fibroblasts into stably expandable neural progenitor cells that might provide a cellular source for biomedical applications such as autologous neural cell replacement and disease modeling.

Generation of induced pluripotent stem cells provides fascinating prospects for the derivation of autologous transplants. However, progression through a pluripotent state and laborious re-differentiation still hinders clinical translation. Here we describe the derivation of adult human fibroblasts and their direct conversion into induced neural progenitor cells and the subsequent differentiation into neural lineages.

גזירה של fibroblasts אדם הבוגר וההמרה ישירה שלהם לתאים להרחבה עצבי אב

Generation of&#160;induced pluripotent stem cell (iPSCs) from adult skin fibroblasts and subsequent differentiation into somatic cells provides ...

Identifying Cell Surface Markers of Primary Neural Stem and Progenitor Cells by Metabolic Labeling of Sialoglycan

Neural stem and progenitor cells (NSPCs) are the cellular basis for the complex structures and functions of the brain. They are located in specialized niches in vivo and can be isolated and expanded in vitro, serving as an important resource for cell transplantation to repair brain damage. However, NSPCs are heterogeneous and not clearly defined at the molecular level or purified due to a lack of specific cell surface markers. The protocol presented, which has been previously reported, combines a neural-endothelial co-culture system with a metabolic glycan labeling method to identify the surface sialoglycoproteome of primary NSPCs. The NSPC-endothelial co-culture system allows self-renewal and expansion of primary NSPCs in vitro, generating a sufficient number of NSPCs. Sialoglycans in cultured NSPCs are labeled using an unnatural sialic acid metabolic reporter with bioorthogonal functional groups. By comparing the sialoglycoproteome from self-renewing NSPCs expanded in an endothelial co-culture with differentiating neural culture, we identify a list of membrane proteins that are enriched in NSPCs. In detail, the protocol involves: 1) set-up of an NSPC-endothelial co-culture and NSPC differentiating culture; 2) labeling with azidosugar per-O-acetylated N-azidoacetylmannosamine (Ac4ManNAz); and 3) biotin conjugation to modified sialoglycan for imaging after fixation of neural culture or protein extraction from neural culture for mass spectrometry analysis. Then, the NSPC-enriched surface marker candidates are selected by comparative analysis of mass spectrometry data from both the expanded NSPC and differentiated neural cultures. This protocol is highly sensitive for identifying membrane proteins of low abundance in the starting materials, and it can be applied to marker discovery in other systems with appropriate modifications

Presented here is a protocol that combines an in vitro neural-endothelial co-culture system and metabolic incorporation of sialoglycan with bioorthogonal functional groups to expand primary neural stem and progenitor cells and label their surface sialoglycoproteins for imaging or mass-spectrometry analysis of cell surface markers.

זיהוי סמני שטח תא של גזע עצבי ראשוני ובתאי מחולל מטבולית על ידי תיוג מטבולי של סילוגליקן

Neural stem and progenitor cells (NSPCs) are the cellular basis for the complex structures and functions of the brain. They are located in specialized ...