وقد تم اختبار هذا البروتوكول وتحسينه في البداية في مختبر الدكتور ريتشارد هينز (MIT). يتم توفير التمويل من جانب NYSTEM جائزة IDEA (لLX) وروث L. كيرشتاين خدمة القومي للبحوث جائزة (لLX).

1. تحضير العينة <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> تنمو الخلايا لمتموجة ~ 70 ٪ في وسائل الإعلام الخاصة بها مع عوامل النمو أو FBS (على سبيل المثال ، مع DMEM FBS 10 ٪ لMC - 1 الخلايا). نضح من وسائل الاعلام لوحة ، ويغسل بلطف عدة مرات مع PBS × 1 (8 ز / لتر من كلوريد الصوديوم ، 0.2 غرام / لتر من بوكل ، 1.15 جم / لتر من نا 2 4 هبو 0.7 H 2 O ، 0.2 غرام / لتر من KH 2 PO 4 ، ودرجة الحموضة 7.3). </li><li style=";text-align:right;direction:rtl"> برنامج تلفزيوني ونضح إضافة 2 مل من التربسين 0.05 ٪ في versene (0.014 غرام / لتر من أحمر الفينول و 0.2 غرام / لتر من EDTA - نا في برنامج تلفزيوني × 1 ، ودرجة الحموضة 7.2). صخرة بلطف لوحة لتسهيل مفرزة الخلية من لوحة. مراقبة الخلايا تحت المجهر. وعادة ما يستغرق 2-5 دقائق للفصل الخلايا. </li><li style=";text-align:right;direction:rtl"> إضافة وحدة تخزين وافرة من وسائل الإعلام التي تحتوي على FBS (فول الصويا أو مثبط التربسين) لإخماد النشاط التربسين وجمع الخلايا في أنبوب الصقر 50mL. عد الخلايا باستخدام عدادة الكريات. تحميل 10μL التعليق الخلية في الصعود إلى عدادة الكريات نظيفة. عدد الخلايا في مل يساوي متوسط ​​عدد الخلايا في كل من المربعات five مضروبا 10 4. </li><li style=";text-align:right;direction:rtl"> الطرد المركزي الخلايا في 1000 دورة في الدقيقة (أو 200 ~ XG) في أجهزة الطرد المركزي الفوق لمدة 3 دقائق. </li><li style=";text-align:right;direction:rtl"> إزالة بعناية وسائل الاعلام من دون إزعاج بيليه الخلية. Resuspend الخلايا في حجم مناسب من الحل المتوازن الاحتياطي هانكس (HBSS) للوصول إلى التركيز النهائي لل~ 5 × 10 6 خلية / مل. </li><li style=";text-align:right;direction:rtl"> تصفية الخلايا خلال 70 ميكرومتر فالكون مصفاة خلية خلية لاستبعاد المجاميع الكبيرة. مكان غيض من ماصة مباشرة على تصفية أكثر من الأنبوب المسمى 5mL الثقافة فالكون. إخراج بسرعة تعليق من خلال تصفية في أنبوب الثقافة. </li><li style=";text-align:right;direction:rtl"> عد مرة أخرى باستخدام خلايا عدادة الكريات وتمييع لهم تركيز النهائي من 2.5 × 10 مل / 6. تبقي الخلايا على الجليد. </li><li style=";text-align:right;direction:rtl"> تحديد الجدوى من الخلايا. خلط بعض الخلايا مع الأزرق التريبان وقياس نسبة الخلايا (الأزرق) الى طريق مسدود بسبب الخلايا مجموع باستخدام عدادة الكريات. ينبغي أن يكون بقاء الخلايا ≥ 90 ٪ قبل الحقن. </li></ol> 2. حقن في الوريد <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> تغيير القفازات. انتزاع بلطف ذيل ماوس العوز المناعي (عارية ، NOD - SCID ، أو مجموعة موردي المواد النووية ، مختبر جاكسون) ، وتسحبه إلى restrainer الماوس ، مع ظهرها ضد الشق وذيله تخرج من فتحة صغيرة في الجزء الخلفي من restrainer . </li><li style=";text-align:right;direction:rtl"> الشريحة ببطء على طول الحلبة الشق الداخلي وقفل مرة واحدة في مكان الحلبة يمسك الفم من الفأرة. ينبغي أن لا يكون الماوس قادرة على التحرك بحرية ، ولكن ينبغي أن يكون المعدل الطبيعي للتنفس. </li><li style=";text-align:right;direction:rtl"> العثور على أوردة الذيل الرئيسية. أربعة الأوعية الدموية الرئيسية موجودة في ذيل الفأر. الأوعية الدموية على جانبي ظهري وبطني من الذيل والشرايين. الأوردة الموجودة على الجانبين الوحشي الذيل. </li><li style=";text-align:right;direction:rtl"> تعادل أكثر من 200 ميكرولتر من خلايا المعدة إلى حقنة 1mL. إرفاق الإبرة 30 G1 / 2 بوصة ، وطرد أي فقاعات الهواء التي قد تكون موجودة. وينبغي أن الحجم النهائي للخلايا في حقنة سيكون 200 ميكرولتر (أي 5 × 10 5 خلايا في المجموع). </li><li style=";text-align:right;direction:rtl"> حقن الخلايا في الوريد الذيل. <ol class="lalpha" style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> أبدأ من النهاية البعيدة من الذيل ، حتى إذا فشل في المحاكمة الأولى ، ويمكن استخدام هذه المنطقة القريبة من أكثر الذيل لمحاولة ثانية. </li><li style=";text-align:right;direction:rtl"> مسح الذيل مع الايثانول 70 ٪. سحب الذيل على التوالي. الاستمرار على طرف الذيل مع الإبهام ودعم للحقن نقطة مع السبابة. </li><li style=";text-align:right;direction:rtl"> ادخال الإبرة في الوريد وحقن الخلايا. تأكد من أن الإبر والمحاقن موازية لالوريد خلال الحقن ، وإلا فإن الإبرة كزة من خلال جدار الوعاء الدموي وحقن هذه الخلايا في الأنسجة المجاورة الذيل. </li><li style=";text-align:right;direction:rtl"> سحب الإبرة بعد الحقن. وينبغي أن الدم الغزير من موقع الحقن إذا ذهب حقن بنجاح. اضغط قطعة نظيفة من منشفة ورقية أو مسحة القطن في موقع الحقن لتسهيل تخثر الدم ، وجس صعودا الذيل لدفع أي عينة المتبقية في الوريد في التداول. </li><li style=";text-align:right;direction:rtl"> الافراج عن الماوس من restrainer وإعادته إلى القفص. سجل عملية الحقن (على سبيل المثال ، كم عدد التجارب التي اتخذها لحقن الخلايا وإلى أي مدى تم حقن الخلايا) في دفتر المختبر. </li><li style=";text-align:right;direction:rtl"> تحديد الجدوى من الخلايا بعد الحقن ، كما هو موضح في قسم إعداد العينات ، والخطوة 9. هذه الخطوة توفر الاطمئنان إلى أن خلايا البقاء على قيد الحياة خلال عملية الحقن. في نهاية تجربة الحقن ، فإن بقاء الخلايا الانخفاض ، ولكن ينبغي أن يكون فوق 80 ٪. </li><li style=";text-align:right;direction:rtl"> (اختياري) تدور باستمرار على بقايا الخلايا وشطف الكريات مع برنامج تلفزيوني واحد. تجميد -80 درجة مئوية في الكريات لتحليل المستقبل (على سبيل المثال ، للتأكد من البقع الغربي التعبير الجيني أو knockdowns). </li></ol></li><li style=";text-align:right;direction:rtl"> عادة بعد شهر أو شهرين ، سيتم تشريح الفئران ، ونحن مصممون على نحو فاضح مواقع الانبثاث. الرئة هو الموقع الرئيسي لورم خبيث ، حيث أنه يحتوي على سرير first الشعرية أن الخلايا اللقاء بعد اندخول الدورة الدموية. </li><li style=";text-align:right;direction:rtl"> بعد الشطف مع برنامج تلفزيوني ، كل فص من الرئة (أو الأنسجة الأخرى التي تحتوي على الانبثاث) لوحظ تحت المجهر تشريح (الشكل 1). يتم احتساب عدد الانبثاث يمكن كشفها في كلا الجانبين من الرئة وتضاف أعداد الانبثاث الرئة على جميع أربعة فصوص معا في العدد الإجمالي للالانبثاث الرئة ويتم الكشف عنها بسهولة أكبر الانبثاث الرئة 1 إذا تم إصلاحها في الرئتين بين عشية وضحاها الفورمالين منذ سوف الانبثاث apppear كبقع بيضاء على النقيض من الظلام المتاخمة أنسجة الرئة البني. </li></ol> 3. زراعة خلايا الرئة من الانبثاث <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> معزولون الانبثاث الرئة من الفئران المحقونة. وينبغي لكل مثقف بشكل منفصل. </li><li style=";text-align:right;direction:rtl"> هو كل مفروم الانبثاث بحلول نهاية قبعة إبرة (معقمة) على مصفاة ميكرومتر الخلية 70. </li><li style=";text-align:right;direction:rtl"> شطف مصفاة مع خلية تراخيص العديد من الخلايا التي تم جمعها والمتوسطة والتي تمر من خلال مصفاة في صحن الثقافة. </li><li style=";text-align:right;direction:rtl"> احتضان الخلايا على 37 درجة مئوية على الأقل أربعة أيام من دون ازعاج. </li><li style=";text-align:right;direction:rtl"> يغسل الدم أو الأنسجة الحطام على الطبق مع برنامج تلفزيوني. </li><li style=";text-align:right;direction:rtl"> إضافة المتوسطة الطازجة. في البداية ، كل من الخلايا السرطانية والخلايا الليفية تنمو على لوحات ، ولكن تدريجيا ، والخلايا الليفية سوف تنقرض وتحل محلها خلايا السرطان. إذا كانت الخلايا السرطانية تحمل أي جينات مقاومة للأدوية ، وحدد الخلايا التي تحتوي على المضادات الحيوية ذات الصلة. </li><li style=";text-align:right;direction:rtl"> ويتم تقييم نقاء من الخلايا التي يجنيها immunostaining باستخدام أجسام مضادة ضد البشرية محددة البروتينات. نستخدم الأضداد المضادة للvimentin الإنسان (NCL - VIM - V9 ، Novocastra). الخلايا المشتقة نحن تحتوي عادة على أكثر من 99 ٪ من الخلايا البشرية ، حتى في غياب التحديد المخدرات. ويمكن حقن الخلايا المشتقة حديثا مرة أخرى إلى الفئران لاختبار العوز المناعي قدراتهم المتنقل ، كما هو موضح أعلاه. </li></ol> 4. ممثل النتائج <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> في نهاية هذا الاختبار ، وخلية السرطان النقيلي للغاية خط يعطي عادة إلى ظهور العديد من الرئة الانبثاث (الشكل 1) ، 1 في حين الانبثاث الرئة عدد قليل جدا سيأتي من خط خلية السرطان النقيلي سيئة. </li><li style=";text-align:right;direction:rtl"> الخلايا المشتقة باستخدام هذا الأسلوب عادة ما تعطي ترتفع إلى أكثر من خط الانبثاث الوالدين ، وعندما يتم اختبارها مرة أخرى باستخدام هذا الاختبار. 1-3 </li></ol><img src="/files/ftp_upload/1942/1942fig1.jpg" alt="الشكل 1" /> صور الممثل الشكل 1. الرئتين الماوس بعد حقن الوريد ذيل الخلايا السرطانية. تم حقن 5 × 10 5 من سرطان الجلد المنتشر الإنسان خط الخلية ، وخلايا SM ، و 4 في الوريد ذيل الفئران العوز المناعي. بعد ذلك بشهرين ، تم عزل الرئتين وعثر الانبثاث فرقت بين أنسجة الرئة العادية.

<ol>
	<li>Xu, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Gene+expression+changes+in+an+animal+melanoma+model+correlate+with+aggressiveness+of+human+melanoma+metastases.">Gene expression changes in an animal melanoma model correlate with aggressiveness of human melanoma metastases.</a> Mol Cancer Res. 6 (5), 760-760 (2008).</li><li>Clark, E. A., Golub, T. R., Lander, E. S., Hynes, R. O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genomic+analysis+of+metastasis+reveals+an+essential+role+for+RhoC.">Genomic analysis of metastasis reveals an essential role for RhoC.</a> Nature. 406 (6795), 532-532 (2000).</li><li>Xu, L., Begum, S., Hearn, J. D., Hynes, R. O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=GPR56,+an+atypical+G+protein-coupled+receptor,+binds+tissue+transglutaminase,+TG2,+and+inhibits+melanoma+tumor+growth+and+metastasis.">GPR56, an atypical G protein-coupled receptor, binds tissue transglutaminase, TG2, and inhibits melanoma tumor growth and metastasis.</a> Proc Natl Acad Sci U S A. 103 (24), 9023-9023 (2006).</li><li>Kozlowski, J. M., Hart, I. R., Fidler, I. J., Hanna, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+human+melanoma+line+heterogeneous+with+respect+to+metastatic+capacity+in+athymic+nude+mice.">A human melanoma line heterogeneous with respect to metastatic capacity in athymic nude mice.</a> J Natl Cancer Inst. 72 (4), 913-913 (1984).</li><li>Kang, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+multigenic+program+mediating+breast+cancer+metastasis+to+bone.">A multigenic program mediating breast cancer metastasis to bone.</a> Cancer Cell. 3 (6), 537-537 (2003).</li></ol>

الانبثاث هي السبب الرئيسي للوفاة لدى مرضى السرطان. أنها تنطوي على أربع خطوات رئيسية : المفرزة من الخلايا السرطانية من مواضع الأساسي ، دخولهم في التداول (intravasation) ، خروجهم من التداول (التسرب) ، والبقاء والنمو في الجهاز البعيد. يعتبر ورم خبيث في الإنسان عملية بطيئة وتجلت...

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">	
		
		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>DMEM</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>10313-021</td>
<td>&nbsp;</td>
<tr>
<td>FBS</td>
<td>&nbsp;</td>
<td>Hyclone</td>
<td>SH30088.03</td>
<td>&nbsp;</td>
<tr>
<td>HBSS</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>14175-095</td>
<td>&nbsp;</td>
<tr>
<td>NaCl</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>S9888</td>
<td>&nbsp;</td>
<tr>
<td>KCl</td>
<td>&nbsp;</td>
<td>Mallinckrodt Chemicals</td>
<td>6838-04</td>
<td>&nbsp;</td>
<tr>
<td>Na2 HPO4.7H2O</td>
<td>&nbsp;</td>
<td>Mallinckrodt Chemicals</td>
<td>7896-04</td>
<td>&nbsp;</td>
<tr>
<td>KH2PO4</td>
<td>&nbsp;</td>
<td>Mallinckrodt Chemicals</td>
<td>7100-12</td>
<td>&nbsp;</td>
<tr>
<td>Phenol red</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>P3532</td>
<td>&nbsp;</td>
<tr>
<td>EDTA-Na</td>
<td>&nbsp;</td>
<td>EMD Biosciences</td>
<td>4010</td>
<td>&nbsp;</td>
<tr>
<td>Trypan Blue</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>15250-061</td>
<td>&nbsp;</td>
<tr>
<td>Trypsin 2.5%</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>15090-046</td>
<td>&nbsp;</td>
<tr>
<td>Ethanol</td>
<td>&nbsp;</td>
<td>Ultrapure</td>
<td>200-CSGP</td>
<td>&nbsp;</td>
<tr>
<td>50 ml Falcon Tube</td>
<td>&nbsp;</td>
<td>VWR</td>
<td>89039-656</td>
<td>&nbsp;</td>
<tr>
<td>Microcentrifuge Tubes</td>
<td>&nbsp;</td>
<td>Axygen Scientific</td>
<td>MCT-175-C</td>
<td>&nbsp;</td>
<tr>
<td>Falcon 70&#181;m Cell Strainer</td>
<td>&nbsp;</td>
<td>BD Biosciences</td>
<td>352350</td>
<td>&nbsp;</td>
<tr>
<td>5ml Falcon Culture Tube</td>
<td>&nbsp;</td>
<td>VWR</td>
<td>60818-576</td>
<td>&nbsp;</td>
<tr>
<td>Hemacytometer</td>
<td>&nbsp;</td>
<td>Hausser Scientific</td>
<td>15170-208</td>
<td>&nbsp;</td>
<tr>
<td>1 ml syringe</td>
<td>&nbsp;</td>
<td>BD Biosciences</td>
<td>329650</td>
<td>&nbsp;</td>
<tr>
<td>30 &frac12; gauge needle</td>
<td>&nbsp;</td>
<td>BD Biosciences</td>
<td>305106</td>
<td>&nbsp;</td>
<tr>
<td>Mouse restrainer</td>
<td>&nbsp;</td>
<td>Plas Labs Inc.</td>
<td>551-BSRR</td>
<td>&nbsp;</td>
<tr>
<td>Surgical scissors</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>08-940</td>
<td>&nbsp;</td>
<tr>
<td>Forceps</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>08-902</td>
<td>&nbsp;</td>
<tr>
<td>Dissecting Microscope</td>
<td>&nbsp;</td>
<td>Nikon</td>
<td>SMZ1500</td>
<td>&nbsp;</td>
<tr>
<td>Benchtop Centrifuge</td>
<td>&nbsp;</td>
<td>Thermoscientific</td>
<td>75003491</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

experimental metastasis assay

الانبثاث هي السبب الرئيسي للوفاة لدى مرضى السرطان. لفهم آلية من ورم خبيث ، أنشئت لفحص الانبثاث تجريبية باستخدام الفئران العوز المناعي. هذه المادة يحدد الإجراءات التي ينطوي عليها هذا الاختبار ، بما في ذلك إعداد العينات ، والحقن في الوريد ، واستنبات الخلايا من الانبثاث الرئة. لفترة وجيزة ، تم إعداد عدد محدد مسبقا من الخلايا السرطانية البشرية<em&gt; في المختبر</em&gt; وحقنه مباشرة في الدورة الدموية للفئران العوز المناعي عن طريق الأوردة ذيلها. وهناك عدد قليل من الخلايا تنجو من اضطرابات في الدورة الدموية وتنمو الانبثاث في الأعضاء الداخلية ، مثل الرئة. يتم تشريح الفئران حقن بعد فترة معينة. يتحدد توزيع الأنسجة الانبثاث تشريح تحت المجهر. يتم احتساب عدد الانبثاث في نسيج معين وأنه يرتبط بشكل مباشر مع القدرة النقيلي من حقن الخلايا السرطانية. يتم عزل الانبثاث نشأت ومثقف<em&gt; في المختبر</em&gt; كخطوط الخلية ، والتي غالبا ما تظهر قدرات محسنة النقيلي من خط الوالدين عندما تم حقنها في الفئران مرة أخرى العوز المناعي. هذه المشتقات المنتشر بشدة تصبح أدوات مفيدة لتحديد الجينات الجزيئية أو المسارات التي تنظم التقدم النقيلي.

Watch this Scientific Journal Video about Experimental Metastasis Assay at JoVE.com

Experimental Metastasis Assay

توضح هذه المقالة الإجراءات لفحص الانبثاث التجريبية التي تستخدم لتحديد إمكانية النقيلي من خطوط الخلايا السرطانية البشرية.

الفحص التجريبي الإنبثاث

Metastasis is the leading cause of death in cancer patients.  To understand the mechanism of metastasis, an experimental metastasis assay was established ...

Research

JoVE Journal

Medicine

20.2K Views.  University of Rochester Medical Center. توضح هذه المقالة الإجراءات لفحص الانبثاث التجريبية التي تستخدم لتحديد إمكانية النقيلي من خطوط الخلايا السرطانية البشرية.

Video: Experimental Metastasis Assay

Quantitative Analysis of Cancer Metastasis using an Avian Embryo Model

During metastasis cancer cells disseminate from the primary tumor, invade into surrounding tissues, and spread to distant organs. Metastasis is a complex process that can involve many tissue types, span variable time periods, and often occur deep within organs, making it difficult to investigate and quantify. In addition, the efficacy of the metastatic process is influenced by multiple steps in the metastatic cascade making it difficult to evaluate the contribution of a single aspect of tumor cell behavior. As a consequence, metastasis assays are frequently performed in experimental animals to provide a necessarily realistic context in which to study metastasis. Unfortunately, these models are further complicated by their complex physiology. The chick embryo is a unique in vivo model that overcomes many limitations to studying metastasis, due to the accessibility of the chorioallantoic membrane (CAM), a well-vascularized extra-embryonic tissue located underneath the eggshell that is receptive to the xenografting of tumor cells (figure 1). Moreover, since the chick embryo is naturally immunodeficient, the CAM readily supports the engraftment of both normal and tumor tissues. Most importantly, the avian CAM successfully supports most cancer cell characteristics including growth, invasion, angiogenesis, and remodeling of the microenvironment. This makes the model exceptionally useful for the investigation of the pathways that lead to cancer metastasis and to predict the response of metastatic cancer to new potential therapeutics. The detection of disseminated cells by species-specific Alu PCR makes it possible to quantitatively assess metastasis in organs that are colonized by as few as 25 cells. Using the Human Epidermoid Carcinoma cell line (HEp3) we use this model to analyze spontaneous metastasis of cancer cells to distant organs, including the chick liver and lung. Furthermore, using the Alu-PCR protocol we demonstrate the sensitivity and reproducibility of the assay as a tool to analyze and quantitate intravasation, arrest, extravasation, and colonization as individual elements of metastasis.

Using quantitative PCR, we demonstrate how the well-established chick CAM model can be used to quantitatively analyze the metastasis of human tumor cells to distant organs.

تحليل الكمي الإنبثاث السرطان باستخدام الأجنة النموذجي الطيور

During metastasis cancer cells disseminate from the primary tumor, invade into surrounding tissues, and spread to distant organs. Metastasis is a complex ...

In vitro Mesothelial Clearance Assay that Models the Early Steps of Ovarian Cancer Metastasis

Ovarian cancer is the fifth leading cause of cancer related deaths in the United States1. Despite a positive initial response to therapies, 70 to 90 percent of women with ovarian cancer develop new metastases, and the recurrence is often fatal2. It is, therefore, necessary to understand how secondary metastases arise in order to develop better treatments for intermediate and late stage ovarian cancer. Ovarian cancer metastasis occurs when malignant cells detach from the primary tumor site and disseminate throughout the peritoneal cavity. The disseminated cells can form multicellular clusters, or spheroids, that will either remain unattached, or implant onto organs within the peritoneal cavity3 (Figure 1, Movie 1). 
All of the organs within the peritoneal cavity are lined with a single, continuous, layer of mesothelial cells4-6 (Figure 2). However, mesothelial cells are absent from underneath peritoneal tumor masses, as revealed by electron micrograph studies of excised human tumor tissue sections3,5-7 (Figure 2). This suggests that mesothelial cells are excluded from underneath the tumor mass by an unknown process. 
Previous in vitro experiments demonstrated that primary ovarian cancer cells attach more efficiently to extracellular matrix than to mesothelial cells8, and more recent studies showed that primary peritoneal mesothelial cells actually provide a barrier to ovarian cancer cell adhesion and invasion (as compared to adhesion and invasion on substrates that were not covered with mesothelial cells)9,10. This would suggest that mesothelial cells act as a barrier against ovarian cancer metastasis. The cellular and molecular mechanisms by which ovarian cancer cells breach this barrier, and exclude the mesothelium have, until recently, remained unknown. 
Here we describe the methodology for an in vitro assay that models the interaction between ovarian cancer cell spheroids and mesothelial cells in vivo (Figure 3, Movie 2). Our protocol was adapted from previously described methods for analyzing ovarian tumor cell interactions with mesothelial monolayers8-16, and was first described in a report showing that ovarian tumor cells utilize an integrin &#x2013;dependent activation of myosin and traction force to promote the exclusion of the mesothelial cells from under a tumor spheroid17. This model takes advantage of time-lapse fluorescence microscopy to monitor the two cell populations in real time, providing spatial and temporal information on the interaction. The ovarian cancer cells express red fluorescent protein (RFP) while the mesothelial cells express green fluorescent protein (GFP). RFP-expressing ovarian cancer cell spheroids attach to the GFP-expressing mesothelial monolayer. The spheroids spread, invade, and force the mesothelial cells aside creating a hole in the monolayer. This hole is visualized as the negative space (black) in the GFP image. The area of the hole can then be measured to quantitatively analyze differences in clearance activity between control and experimental populations of ovarian cancer and/ or mesothelial cells. This assay requires only a small number of ovarian cancer cells (100 cells per spheroid X 20-30 spheroids per condition), so it is feasible to perform this assay using precious primary tumor cell samples. Furthermore, this assay can be easily adapted for high throughput screening.

In vitro Mesothelial Clearance Assay that Models the Early Steps of Ovarian Cancer Metastasis

The mesothelial clearance assay described here takes advantage of fluorescently labeled cells and time-lapse video microscopy to visualize and quantitatively measure the interactions of ovarian cancer multicellular spheroids and mesothelial cell monolayers. This assay models the early steps of ovarian cancer metastasis.

في الفحص المختبري التخليص الظهارية النماذج أن الخطوات في وقت مبكر من الإنبثاث سرطان المبيض

Ovarian cancer is the fifth leading cause of cancer related deaths in the United States1. Despite a positive initial response to therapies, 70 to 90 ...

Models of Bone Metastasis

Bone metastases are a common occurrence in several malignancies, including breast, prostate, and lung. Once established in bone, tumors are responsible for significant morbidity and mortality1. Thus, there is a significant need to understand the molecular mechanisms controlling the establishment, growth and activity of tumors in bone. Several in vivo models have been established to study these events and each has specific benefits and limitations. The most commonly used model utilizes intracardiac inoculation of tumor cells directly into the arterial blood supply of athymic (nude) BalbC mice. This procedure can be applied to many different tumor types (including PC-3 prostate cancer, lung carcinoma, and mouse mammary fat pad tumors); however, in this manuscript we will focus on the breast cancer model, MDA-MB-231. In this model we utilize a highly bone-selective clone, originally derived in Dr. Mundy's group in San Antonio2, that has since been transfected for GFP expression and re-cloned by our group3. This clone is a bone metastatic variant with a high rate of osteotropism and very little metastasis to lung, liver, or adrenal glands. While intracardiac injections are most commonly used for studies of bone metastasis2, in certain instances intratibial4 or mammary fat pad injections are more appropriate. Intracardiac injections are typically performed when using human tumor cells with the goal of monitoring later stages of metastasis, specifically the ability of cancer cells to arrest in bone, survive, proliferate, and establish tumors that develop into cancer-induced bone disease. Intratibial injections are performed if focusing on the relationship of cancer cells and bone after a tumor has metastasized to bone, which correlates roughly to established metastatic bone disease. Neither of these models recapitulates early steps in the metastatic process prior to embolism and entry of tumor cells into the circulation. If monitoring primary tumor growth or metastasis from the primary site to bone, then mammary fat pad inoculations are usually preferred; however, very few tumor cell lines will consistently metastasize to bone from the primary site, with 4T1 bone-preferential clones, a mouse mammary carcinoma, being the exception 5,6.
This manuscript details inoculation procedures and highlights key steps in post inoculation analyses. Specifically, it includes cell culture, tumor cell inoculation procedures for intracardiac and intratibial inoculations, as well as brief information regarding weekly monitoring by x-ray, fluorescence and histomorphometric analyses.

Animal models are frequently utilized to study cancer metastasis to bone. In this protocol we will describe two common methods of tumor inoculation for bone metastasis studies and briefly describe some of the analyses utilized to monitor and quantify these models.

نماذج من الانبثاث العظام

Bone metastases are a common occurrence in several malignancies, including breast, prostate, and lung. Once established in bone, tumors are responsible ...

Experimental Human Pneumococcal Carriage

Experimental human pneumococcal carriage (EHPC) is scientifically important because nasopharyngeal carriage of Streptococcus pneumoniae is both the major source of transmission and the prerequisite of invasive disease. A model of carriage will allow accurate determination of the immunological correlates of protection, the immunizing effect of carriage and the effect of host pressure on the pathogen in the nasopharyngeal niche. Further, methods of carriage detection useful in epidemiologic studies, including vaccine studies, can be compared.
Aim
We aim to develop an EHPC platform that is a safe and useful reproducible method that could be used to down-select candidate novel pneumococcal vaccines with prevention of carriage as a surrogate of vaccine induced immunity. It will work towards testing of candidate vaccines and descriptions of the mechanisms underlying EHPC and vaccine protection from carriage1. Current conjugate vaccines against pneumococcus protect children from invasive disease although new vaccines are urgently needed as the current vaccine does not confer optimal protection against non-bacteraemic pneumonia and there has been evidence of serotype replacement with non-vaccine serotypes2-4.
Method
We inoculate with S. pneumoniae suspended in 100 &mu;l of saline. Safety is a major factor in the development of the EHPC model and is achieved through intensive volunteer screening and monitoring. A safety committee consisting of clinicians and scientists that are independent from the study provides objective feedback on a weekly basis.
The bacterial inoculum is standardized and requires that no animal products are inoculated into volunteers (vegetable-based media and saline). The doses required for colonization (104-105) are much lower than those used in animal models (107)5. Detecting pneumococcal carriage is enhanced by a high volume (ideally &gt;10 ml) nasal wash that is relatively mucus free. This protocol will deal with the most important parts of the protocol in turn. These are (a) volunteer selection, (b) pneumococcal inoculum preparation, (c) inoculation, (d) follow-up and (e) carriage detection.
Results
Our current protocol has been safe in over 100 volunteers at a range of doses using two different bacterial serotypes6. A dose ranging study using S. pneumoniae 6B and 23F is currently being conducted to determine the optimal inoculation dose for 50% carriage. A predicted 50% rate of carriage will allow the EHPC model to have high sensitivity for vaccine efficacy with small study numbers.

Experimental human pneumococcal carriage offers a natural model of carriage and a potential model for use in vaccine development. This technique is valuable yet complex and involves clinical risk by introducing a pathogen into a human. We have developed a detailed protocol.

التجريبية النقل المكورات الرئوية الإنسان

Experimental human pneumococcal carriage (EHPC) is scientifically important because nasopharyngeal carriage of Streptococcus pneumoniae is both the major ...

The In ovo CAM-assay as a Xenograft Model for Sarcoma

Sarcoma is a very rare disease that is heterogeneous in nature, all hampering the development of new therapies. Sarcoma patients are ideal candidates for personalized medicine after stratification, explaining the current interest in developing a reproducible and low-cost xenotransplant model for this disease. The chick chorioallantoic membrane is a natural immunodeficient host capable of sustaining grafted tissues and cells without species-specific restrictions. In addition, it is easily accessed, manipulated and imaged using optical and fluorescence stereomicroscopy. Histology further allows detailed analysis of heterotypic cellular interactions.
This protocol describes in detail the in ovo grafting of the chorioallantoic membrane with fresh sarcoma-derived tumor tissues, their single cell suspensions, and permanent and transient fluorescently labeled established sarcoma cell lines (Saos-2 and SW1353). The chick survival rates are up to 75%. The model is used to study graft- (viability, Ki67 proliferation index, necrosis, infiltration) and host (fibroblast infiltration, vascular ingrowth) behavior. For localized grafting of single cell suspensions, ECM gel provides significant advantages over inert containment materials. The Ki67 proliferation index is related to the distance of the cells from the surface of the CAM and the duration of application on the CAM, the latter determining a time frame for the addition of therapeutic products.

The In ovo CAM-assay as a Xenograft Model for Sarcoma

The in ovo chorioallantoic membrane (CAM) is grafted with fresh sarcoma-derived tumor tissues, their single cell suspensions, and permanent and transient fluorescently labeled established sarcoma cell lines. The model is used to study graft- (viability, Ki67 proliferation index, necrosis, infiltration) and host (fibroblast infiltration, vascular ingrowth) behavior.

ال<em&gt; في البيضة</em&gt; CAM-مقايسة باعتبارها Xenograftmodel عن الورم اللحمي

Sarcoma is a very rare disease that is heterogeneous in nature, all hampering the development of new therapies. Sarcoma patients are ideal candidates for ...

An Orthotopic Murine Model of Human Prostate Cancer Metastasis

Our laboratory has developed a novel orthotopic implantation model of human prostate cancer (PCa). As PCa death is not due to the primary tumor, but rather the formation of distinct metastasis, the ability to effectively model this progression pre-clinically is of high value. In this model, cells are directly implanted into the ventral lobe of the prostate in Balb/c athymic mice, and allowed to progress for 4-6 weeks. At experiment termination, several distinct endpoints can be measured, such as size and molecular characterization of the primary tumor, the presence and quantification of circulating tumor cells in the blood and bone marrow, and formation of metastasis to the lung. In addition to a variety of endpoints, this model provides a picture of a cells ability to invade and escape the primary organ, enter and survive in the circulatory system, and implant and grow in a secondary site. This model has been used effectively to measure metastatic response to both changes in protein expression as well as to response to small molecule therapeutics, in a short turnaround time.

This orthotopic model of human prostate cancer allows for quantification of tumor size, circulating tumor cells, and formation of distinct metastasis to the lung. As cells must escape the primary organ, enter the blood stream, and implant into a secondary site, this model effectively recapitulates the scenario in humans.

على الفئران نموذج مثلي من سرطان البروستاتا البشرية الانبثاث

Our laboratory has developed a novel orthotopic implantation model of  human prostate cancer (PCa). As PCa death is not due to the primary tumor, but  ...

Primary Tumor and MEF Cell Isolation to Study Lung Metastasis

In breast tumorigenesis, the metastatic stage of the disease poses the greatest threat to the affected individual. Normal breast cells with altered genotypes now possess the ability to invade and survive in other tissues. In this protocol, mouse mammary tumors are removed and primary cells are prepared from tumors. The cells isolated from this procedure are then available for gene profiling experiments. For successful metastasis, these cells must be able to intravasate, survive in circulation, extravasate to distant organs, and survive in that new organ system. The lungs are the typical target of breast cancer metastasis. A set of genes have been discovered that mediates the selectivity of metastasis to the lung. Here we describe a method of studying lung metastasis from a genetically engineered mouse model.. Furthermore, another protocol for analyzing mouse embryonic fibroblasts (MEFs) from the mouse embryo is included. MEF cells from the same animal type provide a clue of non-cancer cell gene expression. Together, these techniques are useful in studying mouse mammary tumorigenesis, its associated signaling mechanisms and pathways of the abnormalities in embryos.

The goal of this protocol is to study breast tumorigenesis. With this technique, mouse mammary tumors are removed and primary cells are prepared from tumors. A lung extraction protocol is included for studying lung metastasis. Furthermore, another protocol for analyzing mouse embryonic fibroblasts from the mouse embryo is included.

ورم الابتدائي وMEF عزل الخلايا لدراسة الرئة الانبثاث

In breast tumorigenesis, the metastatic stage of the disease poses the greatest threat to the affected individual. Normal breast cells with altered ...

Chick Heart Invasion Assay for Testing the Invasiveness of Cancer Cells and the Activity of Potentially Anti-invasive Compounds

The goal of the chick heart assay is to offer a relevant organ culture method to study tumor invasion in three dimensions. The assay can distinguish between invasive and non-invasive cells, and enables study of the effects of test compounds on tumor invasion. Cancer cells - either as aggregates or single cells - are confronted with fragments of embryonic chick heart. After organ culture in suspension for a few days or weeks the confronting cultures are fixed and embedded in paraffin for histological analysis. The three-dimensional interaction between the cancer cells and the normal tissue is then reconstructed from serial sections stained with hematoxylin-eosin or after immunohistochemical staining for epitopes in the heart tissue or the confronting cancer cells. The assay is consistent with the recent concept that cancer invasion is the result of molecular interactions between the cancer cells and their neighbouring stromal host elements (myofibroblasts, endothelial cells, extracellular matrix components, etc.). Here, this stromal environment is offered to the cancer cells as a living tissue fragment. Supporting aspects to the relevance of the assay are multiple. Invasion in the assay is in accordance with the criteria of cancer invasion: progressive occupation and replacement in time and space of the host tissue, and invasiveness and non-invasiveness in vivo of the confronting cells generally correlates with the outcome of the assay. Furthermore, the invasion pattern of cells in vivo, as defined by pathologists, is reflected in the histological images in the assay. Quantitative structure-activity relation (QSAR) analysis of the results obtained with numerous potentially anti-invasive organic congener compounds allowed the study of structure-activity relations for flavonoids and chalcones, and known anti-metastatic drugs used in the clinic (e.g., microtubule inhibitors) inhibit invasion in the assay as well. However, the assay does not take into account immunological contributions to cancer invasion.

Here, we present a protocol to study the invasion of tumor cells into living normal tissue fragments in three dimensions. This organ culture technique is mainly applied to test potentially anti-invasive drugs in vitro.

فرخ القلب الغزو الفحص لاختبار الغازية من خلايا سرطان وآخر للمركبات يحتمل مكافحة الغازية

The goal of the chick heart assay is to offer a relevant organ culture method to study tumor invasion in three dimensions. The assay can distinguish ...

A "Patient-Like" Orthotopic Syngeneic Mouse Model of Hepatocellular Carcinoma Metastasis

The majority of cancer-related deaths are caused by the metastasis of the cancer rather than the primary tumor itself. Yet, the underlying mechanisms of cancer metastasis are still unclear. Animal models are essential for elucidating the mechanisms and for evaluating novel strategies for the treatment of metastatic cancers. Here, an in-depth description of a &#8220;patient-like&#8221; orthotopic syngeneic mouse model for exploring the mechanisms of metastasis of solid organ tumors is provided. The survival surgical implantation of BNL 1ME A.7R.1 mouse hepatocellular carcinoma cells directly into the liver (the organ of origin) of the inbred wild-type immune competent laboratory mouse strain, BALB/c is described. The success and reproducibility of this methodology recommends it for widespread use in elucidating the biological mechanisms of solid organ cancer metastasis.

A &quot;Patient-Like&quot; Orthotopic Syngeneic Mouse Model of Hepatocellular Carcinoma Metastasis

The metastatic spread of cancer is the major cause of cancer-related deaths. We provide an in-depth description of our survival surgery methodology for establishing a &#8220;patient-like&#8221; orthotopic syngeneic mouse model system for studying the mechanisms of metastasis in solid organ tumors.

A &quot;المريض مثل&quot; مثلي مسانج نموذج الفأر من سرطان الكبد الانبثاث

The majority of cancer-related deaths are caused by the metastasis of the cancer rather than the primary tumor itself. Yet, the underlying mechanisms of ...

Quantitation of Intra-peritoneal Ovarian Cancer Metastasis

Epithelial ovarian cancer (EOC) is the leading cause of death from gynecologic malignancy in the United States. Mortality is due to diagnosis of 75% of women with late stage disease, when metastasis is already present. EOC is characterized by diffuse and widely disseminated intra-peritoneal metastasis. Cells shed from the primary tumor anchor in the mesothelium that lines the peritoneal cavity as well as in the omentum, resulting in multi-focal metastasis, often in the presence of peritoneal ascites. Efforts in our laboratory are directed at a more detailed understanding of factors that regulate EOC metastatic success. However, quantifying metastatic tumor burden represents a significant technical challenge due to the large number, small size and broad distribution of lesions throughout the peritoneum. Herein we describe a method for analysis of EOC metastasis using cells labeled with red fluorescent protein (RFP) coupled with in vivo multispectral imaging. Following intra-peritoneal injection of RFP-labelled tumor cells, mice are imaged weekly until time of sacrifice. At this time, the peritoneal cavity is surgically exposed and organs are imaged in situ. Dissected organs are then placed on a labeled transparent template and imaged ex vivo. Removal of tissue auto-fluorescence during image processing using multispectral unmixing enables accurate quantitation of relative tumor burden. This method has utility in a variety of applications including therapeutic studies to evaluate compounds that may inhibit metastasis and thereby improve overall survival.

Ovarian cancer metastasis is characterized by numerous diffuse intra-peritoneal lesions, such that accurate visual quantitation of tumor burden is challenging. Herein we describe a method for in situ and ex vivo quantitation of metastatic tumor burden using red fluorescent protein (RFP)-labeled tumor cells and optical imaging.

الكميات من البينية البريتوني ورم خبيث سرطان المبيض

Epithelial ovarian cancer (EOC) is the leading cause of death from gynecologic malignancy in the United States.  Mortality is due to diagnosis of 75% of ...