1. تأسيس ثلاثي الأبعاد المشارك الثقافات <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> قبل يوم من إقامة المؤسسات المشتركة في الثقافات، وإزالة Matrigel من الفريزر وذوبان الجليد على الجليد في الثلاجة 4 درجات مئوية خلال الليل. </li><li style=";text-align:right;direction:rtl"> في يوم من التجربة، وإعداد وسيلة للثقافة المشتركة، والتي تتطابق مع متوسط ​​للخلايا الظهارية لاستخدامها (وسط HMEC في هذا المثال: DME/F12 المتوسط ​​مع 10٪ مصل العجل البقري، 5 ميكروغرام / مل الأنسولين ، 1 ميكروغرام / مل الهيدروكورتيزون، و1 نانوغرام / مل EGF). الحفاظ على المتوسط ​​في ساعة على الأقل 1 الجليد قبل الاختلاط مع Matrigel. </li><li style=";text-align:right;direction:rtl"> لتخفيف Matrigel إذابة، وتحديد الكمية الإجمالية المطلوبة من Matrigel: متوسطة (300 ميكرولتر لكل بئر لمدة 24 جيدا لوحات)، ويضاف نصف هذا الحجم من الثلج الباردة المتوسطة HMEC إلى أنبوب معقم على الجليد. ثم يضيف نفس نصف مجموع حجم Matrigel إذابة للأنبوب لتحقيق تخفيف 1:1. الحفاظ على أنبوب على الجليد. </li><li style=";text-align:right;direction:rtl"> مكان 50 ميكرولتر من Matrigel: خليط المتوسطة منتصف جيدا في الآبار المخصصة لوحة 24-جيدا واحتضان لمدة 10 دقيقة في الحاضنة 37 درجة مئوية مع مرطب الهواء، و 5٪ CO 2. </li><li style=";text-align:right;direction:rtl"> إضافة مبلغ إضافي 450 ميكرولتر من Matrigel: خليط المتوسطة إلى الآبار واحتضان لمدة 60 دقيقة. </li><li style=";text-align:right;direction:rtl"> أثناء الحضانة، وإعداد وتعليق 01:01 من الخلايا الليفية (هنا لحد من الخلايا الليفية H-ثالثي خلد الثديية معربا عن GFP) والخلايا الظهارية (هنا الإنسان الثديية H-ثالثي خلد خط الخلايا الظهارية معربا عن RFP) بتركيز 0.5 × 10 5 خلايا في كل 0.5 مل من المتوسط ​​HMEC. </li><li style=";text-align:right;direction:rtl"> بعد الخطوة حضانة لمدة 60 دقيقة، وانخفاض بلطف تعليق الخلية على الجزء العلوي من هلام طدت، والعودة إلى ثقافة الحاضنة. </li><li style=";text-align:right;direction:rtl"> لا تعكر صفو الثقافات لمدة 2 ايام. بعد هذا، يمكن تغيير كل 2-3 أيام المتوسط ​​بواسطة الشفط جدا بلطف المتوسطة من جانب جيدا وبلطف مع استبدال المتوسطة HMEC الطازجة. </li><li style=";text-align:right;direction:rtl"> رصد تشكيل كروي يوميا تحت المجهر. الثقافات عادة ما تكون ناضجة بعد 10-14 يوما. الصورة كماالمناسبة باستخدام ضوء الفلورسنت أو المجهري. ويمكن قياس حجم كروي وطول إسقاط تحت المجهر الضوئي. </li></ol> 2. عزل خلايا من الجسم الشبه الكروي المشارك الثقافات <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> بلطف شديد، ماصة للثقافة صعودا ونزولا 10X باستخدام معقم ماصة الزجاج 2 مل. بدلا من ذلك، قطع غيض من طرف ميكروليتر 1000 ماصة بلاستيكية معقمة باستخدام مقص أو عن طريق جهاز الأوتوكليف الانغماس في الايثانول 70٪ من أجل ماصة للثقافة. نقل ثقافة إما مع ماصة الزجاج أو خفض رأس ماصة بلاستيكية معقمة إلى 15 مل أنبوب الطرد المركزي وأجهزة الطرد المركزي لمدة 5 دقائق عند 2000 دورة في الدقيقة في درجة حرارة الغرفة. ستقوم الأجسام الشبه الكروية الخلوية الرواسب في القاع. </li><li style=";text-align:right;direction:rtl"> استخدام معقم طرف ماصة باستير لإزالة بلطف Matrigel تعطلت من الجزء العلوي من أنبوب يتم طرده مركزيا. </li><li style=";text-align:right;direction:rtl"> إضافة 1 مل المتوسطة HMEC إلى مكعبات الأجسام الشبه الكروية، ماصة صعودا وهبوطا 2-3 مرات مع معقم 2 ماصة زجاج مل، ونقل الثقافة إلى بئر في بئر-24نسيج لوحة الثقافة. </li><li style=";text-align:right;direction:rtl"> السماح للالأجسام الشبه الكروية لتعلقها على طبق ما لا يقل عن 48 ساعة قبل تغيير المتوسطة. مع مرور الوقت سوف الخلايا ترك الهياكل كروي وتنمو كما monolayers. </li><li style=";text-align:right;direction:rtl"> مرور الخلية الثقافات عندما تصل إلى نقطة التقاء الخلايا بنسبة 50٪. أولا إظهار الثقافة إلى صحن 35 ملم (حوالي 2-4 أيام)، ثم إلى صحن 100 ملم (حوالي 3-5 أيام). مباشرة قبل مرور كل خطوة، واستخدام معقم باستور ماصة لإزالة يدويا كما كثير المتبقية &quot;الأجسام الشبه الكروية الأشباح&quot; قدر الإمكان. </li><li style=";text-align:right;direction:rtl"> تحليل الخلايا عن طريق التدفق الخلوي لنقاء السكان الذين يستخدمون المناسبة علامات سطح الخلية، وكذلك فصل السكان خلية مختلفة عن طريق الفرز الخلية مضان إذا لزم الأمر. خلايا معزولة الآن على استعداد لمزيد من التحليل على النحو المرغوب فيه. </li></ol> 3. ممثل النتائج في ثلاثي الأبعاد كروي شارك في الثقافات، والخلايا الليفية مع إسكات Tiam1 هندسيا لحث على غزو زيادة في درجة الماجستيرتريكس بواسطة الخلايا الظهارية الثديية (الشكل 1، مقارنة D، E، F إلى A، B، C). الليفية مع المهندسة الإفراط في التعبير عن Tiam1 حث انخفض غزو مصفوفة من قبل خلية خط سرطان الثدي SUM159 (الشكل 1، مقارنة J، K، L إلى G، H، I). مرة واحدة وضعت التعاون مثقف الأجسام الشبه الكروية، يمكن عزل السكان خلية من الأجسام الشبه الكروية من قبل إعادة الطلاء في سياق ثنائي الأبعاد، كما هو مبين في الشكل 2. اعتمادا على معدلات النمو النسبي للخلايا اختبار، قد تظهر من خلال السكان محض مرور مسلسل (كما هو موضح في الشكل 3) أو يمكن فرز باستخدام علامات الخلية المناسبة. بعد عزلة من 3D المشترك والثقافة، والخلايا الظهارية الإبقاء على الخصائص التي تمنحها الثقافة بالتعاون مع الخلايا الليفية على مدى فترات طويلة من الوقت، مما يتيح فرصة واسعة للتحليل. في هذا المثال، التي يسببها التعرض للTiam1 التي تعاني من نقص الخلايا الليفية تزايد الهجرة في التعاون مثقف HMECs التي استمرت لأسابيعfter بمعزل عن ثقافة مشتركة 3D (الشكل 4). <img alt="الشكل 1" src="/files/ftp_upload/3760/3760fig1.jpg" /> الشكل 1. التصوير من وضع كروي شارك في ثقافات تحت المجهر الضوئي ومضان. وتنشأ الثقافات كروي مع الثدي خطوط الخلايا الظهارية والخلايا الليفية، وسمحت للنمو في الثقافة لمدة 10-14 يوما. AF: الظهارية = HMEC-mCherry الخلايا. GL: الخلايا الظهارية = SUM159-mCherry الخلايا. AC، GI: الليفية = سيطرة RMF-GFP الخلايا. DF: الليفية = RMF-GFP مع Tiam1 إسكات. JL: الليفية = RMF-GFP مع Tiam1 الإفراط في التعبير. الأسهم تشير التوقعات الظهارية الغازية في المصفوفة. <img alt="الشكل 2" src="/files/ftp_upload/3760/3760fig2.jpg" /> الشكل 2. تصوير المسلسل بين الثقافات تحت المجهر الضوئي ومضان بعد بمعزل عن ثقافة Matrigel. يوم 0 يمثل التصوير مباشرة بعد العزلة؛ أيام 1 و 2 و5 تبين بعد أيام من العزلة. الهالة من الخلايا ترك زيادات كروي على مر الزمن. في نهاية المطاف &quot;الأشباح&quot; كروي مع عدد قليل جدا من الخلايا لا يزال (السهم). الأجسام الشبه الكروية عدد قليل جدا من تبقى بعد إزالة شبح والمقطع الاول. <img alt="الشكل (3)" src="/files/ftp_upload/3760/3760fig3.jpg" /> الرقم التدفق الخلوي 3. تحليل الخلايا بعد العزلة من Matrigel شارك في الثقافة. بعد كروي شارك في الثقافات قد نضجت، يتم عزل الخلايا من 3D التعاون مع ثقافة pipetting المسلسل والركض. ويتم تحليل عينة من aliquots التدفق الخلوي (في هذا المثال باستخدام مضان أخضر مضان والحمراء لتحديد GFP، معربا عن الخلايا الليفية وmCherry في التعبير عن الخلايا الظهارية على التوالي) لتحديد السكان النسبي الخلايا الطلائية والخلايا الليفية. <img alt="الشكل 4" src="/files/ftp_upload/3760/3760fig4.jpg" /> الشكل 4. Transwell هجرة HMECs استمرت بعد isolatiعلى من Matrigel شارك في الثقافة. مرة واحدة قد تم الحصول عليها من السكان من خلال ثقافة نقية أو مضان الفرز الخلية، يمكن تحليل الخلايا على النحو المرغوب فيه. هنا تم تقييم هجرة HMECs التعاون مع أي مثقف التحكم (C) أو Tiam1 ناقص (SHT) الليفية عبر transwells مثقب في الأسابيع 2 و 4 و 8 بعد بمعزل عن ثقافة مشتركة.

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الإعلان عن أي تضارب في المصالح.

الطريقة المعروضة هنا يمثل نهجا بسيطة لتحليل آثار الليفية اللحمية في الخلايا الظهارية، بما في ذلك الخلايا السرطانية. لأنها تتيح للتفاعل الخلية خلية مباشرة في سياق ثلاثي الأبعاد بدعم من خارج الخلية المصفوفة غشاء السرداب، في حين تمكن سهل الاستخراج من الخلايا من مصفوف?...

<table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> اسم كاشف </td><td> شركة </td><td> فهرس العدد </td><td> تعليقات </td></tr><tr><td> دينار بحريني Matrigel </td><td> العلوم البيولوجية دينار بحريني </td><td> 356237 </td><td> الفينول الحمراء مجانا </td></tr><tr><td> Hyclone متوسطة السائل الكلاسيكية: DMEM F12 </td><td> ThermoScientific </td><td> SH30023.01 </td><td></td></tr><tr><td> Hyclone البقري العجل المصل </td><td> ThermoScientific </td><td> SH3007303 </td><td></td></tr><tr><td> الانسولين </td><td> EMD كيماويات </td><td> 407709 </td><td> يذوب في حمض الهيدروكلوريك 0.005N؛ 0.22 فلتر ميكرومتر </td></tr><tr><td> هيدروكورتيزون </td><td> سيغما الدريخ </td><td> H4001 </td><td> تذوب في EtOH 50٪؛ 0.22 فلتر ميكرومتر </td></tr><tr><td> EGF </td><td> سيغما الدريخ </td><td> E9644 </td><td> تذوب في حامض الخليك 10MM؛ 0.22 ميكرومتر فلتر </td></tr></tbody></table>

isolation of mammary epithelial cells from three-dimensional mixed-cell spheroid co-culture

While enormous efforts have gone into identifying signaling pathways and molecules involved in normal and malignant cell behaviors1-2, much of this work has been done using classical two-dimensional cell culture models, which allow for easy cell manipulation. It has become clear that intracellular signaling pathways are affected by extracellular forces, including dimensionality and cell surface tension3-4. Multiple approaches have been taken to develop three-dimensional models that more accurately represent biologic tissue architecture3. While these models incorporate multi-dimensionality and architectural stresses, study of the consequent effects on cells is less facile than in two-dimensional tissue culture due to the limitations of the models and the difficulty in extracting cells for subsequent analysis.
The important role of the microenvironment around tumors in tumorigenesis and tumor behavior is becoming increasingly recognized4. Tumor stroma is composed of multiple cell types and extracellular molecules. During tumor development there are bidirectional signals between tumor cells and stromal cells5. Although some factors participating in tumor-stroma co-evolution have been identified, there is still a need to develop simple techniques to systematically identify and study the full array of these signals6. Fibroblasts are the most abundant cell type in normal or tumor-associated stromal tissues, and contribute to deposition and maintenance of basement membrane and paracrine growth factors7.
Many groups have used three dimensional culture systems to study the role of fibroblasts on various cellular functions, including tumor response to therapies, recruitment of immune cells, signaling molecules, proliferation, apoptosis, angiogenesis, and invasion8-15. We have optimized a simple method for assessing the effects of mammary fibroblasts on mammary epithelial cells using a commercially available extracellular matrix model to create three-dimensional cultures of mixed cell populations (co-cultures)16-22. With continued co-culture the cells form spheroids with the fibroblasts clustering in the interior and the epithelial cells largely on the exterior of the spheroids and forming multi-cellular projections into the matrix. Manipulation of the fibroblasts that leads to altered epithelial cell invasiveness can be readily quantified by changes in numbers and length of epithelial projections23. Furthermore, we have devised a method for isolating epithelial cells out of three-dimensional co-culture that facilitates analysis of the effects of fibroblast exposure on epithelial behavior. We have found that the effects of co-culture persist for weeks after epithelial cell isolation, permitting ample time to perform multiple assays. This method is adaptable to cells of varying malignant potential and requires no specialized equipment. This technique allows for rapid evaluation of in vitro cell models under multiple conditions, and the corresponding results can be compared to in vivo animal tissue models as well as human tissue samples.

Watch this Scientific Journal Video about Isolation of Mammary Epithelial Cells from Three-dimensional Mixed-cell Spheroid Co-culture at JoVE.com

Isolation of Mammary Epithelial Cells from Three-dimensional Mixed-cell Spheroid Co-culture

وصفت طريقة بسيطة لتحليل الآثار المترتبة على الأنسجة الليفية في الخلايا الظهارية المرتبطة بها. ويمكن الجمع بين هذه الطريقة وثلاثي الأبعاد زراعة الأنسجة تسهيل تحليل الخلايا بعد العزلة من 3D. هذه التقنية قابلة للتطبيق على خلايا مختلفة المحتملة الخبيثة، مما يسمح للدراسة منهجية للآثار ورم المرتبطة سدى على الخلايا السرطانية.

عزل الخلايا الظهارية الثديية من ثلاثي الأبعاد الخلايا المختلطة الجسم الشبه الكروي ثقافة المشارك

While enormous efforts have gone into identifying signaling pathways and molecules involved in normal and malignant cell behaviors1-2, much of this work ...

isolation-mammary-epithelial-cells-from-three-dimensional-mixed-cell

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Biology

16.0K Views.  Tufts Medical Center. وصفت طريقة بسيطة لتحليل الآثار المترتبة على الأنسجة الليفية في الخلايا الظهارية المرتبطة بها. ويمكن الجمع بين هذه الطريقة وثلاثي الأبعاد زراعة الأنسجة تسهيل تحليل الخلايا بعد العزلة من 3D. هذه التقنية قابلة للتطبيق على خلايا مختلفة المحتملة الخبيثة، مما يسمح ل?...

Video: Isolation of Mammary Epithelial Cells from Three-dimensional Mixed-cell Spheroid Co-culture

Mouse Mammary Epithelial Cells form Mammospheres During Lactogenic Differentiation

A phenotypic measure commonly used to determine the degree of lactogenic differentiation in mouse mammary epithelial cell cultures is the formation of dome shaped cell structures referred to as mammospheres 1. The HC11 cell line has been employed as a model system for the study of regulation of mammary lactogenic differentiation both in vitro and in vivo 2. The HC11 cells differentiate and synthesize milk proteins in response to treatment with lactogenic hormones. Following the growth of HC11 mouse mammary epithelial cells to confluence, lactogenic differentiation was induced by the addition of a combination of lactogenic hormones including dexamethasone, insulin, and prolactin, referred to as DIP. The HC11 cells induced to differentiate were photographed at times up to 120 hours post induction of differentiation and the number of mammospheres that appeared in each culture was enumerated. The size of the individual mammospheres correlates with the degree of differentiation and this is depicted in the images of the differentiating cells.

HC11 lactogenic differentiation can be characterized by the formation of domed structures referred to as mammospheres. The structures can be enumerated by phase contrast microscopy to aid in quantifying lactogenic differentiation.

الخلايا الظهارية الثديية شكل الماوس Mammospheres خلال التمايز المولد للبن

A phenotypic measure commonly used to determine the degree of lactogenic differentiation in mouse mammary epithelial cell cultures is the formation of ...

Microfluidic Co-culture of Epithelial Cells and Bacteria for Investigating Soluble Signal-mediated Interactions

The human gastrointestinal (GI) tract is a unique environment in which intestinal epithelial cells and non-pathogenic (commensal) bacteria coexist. It has been proposed that the microenvironment that the pathogen encounters in the commensal layer is important in determining the extent of colonization. Current culture methods for investigating pathogen colonization are not well suited for investigating this hypothesis as they do not enable co-culture of bacteria and epithelial cells in a manner that mimics the GI tract microenvironment. Here we describe a microfluidic co-culture model that enables independent culture of eukaryotic cells and bacteria, and testing the effect of the commensal microenvironment on pathogen colonization. The co-culture model is demonstrated by developing a commensal Escherichia coli biofilm among HeLa cells, followed by introduction of enterohemorrhagic E. coli (EHEC) into the commensal island, in a sequence that mimics the sequence of events in GI tract infection.

This protocol describes a microfluidic co-culture model for simultaneous and localized culture of epithelial cells and bacteria. This model can be used for investigating the role of different soluble molecular signals on pathogenesis as well as screen the effectiveness of putative probiotic bacterial strains.

ميكروفلويديك المشارك ثقافة الخلايا الظهارية والبكتيريا للتحقيق في ذوبان الإشارات بوساطة التفاعلات

The human gastrointestinal (GI) tract is a unique environment in which intestinal epithelial cells and non-pathogenic (commensal) bacteria coexist. It has ...

Mammary Epithelial Transplant Procedure

This article describes and compares the fat pad clearance procedure developed by DeOme KB et al.1 and the sparing procedure developed by Brill B et al.2, followed by the mammary epithelial transplant procedure. The mammary transplant procedure is widely used by mammary biologists because it takes advantage of the fact that significant development of the mammary epithelium doesn't occur until after puberty. At 3 weeks of age, growth of the mammary epithelial tree is confined to the vicinity of the nipple and the fat pad is largely devoid of mammary epithelium, but by 7 weeks of age the epithelial ductal tree extends throughout the entire fat pad. Therefore, if this small portion of the fat pad containing epithelium, the region between the nipple and the lymph node, is removed at 3 weeks of age, the endogenous epithelium will never populate the mammary fat pad and the fat pad is described as "cleared". At this time, mammary epithelium from another source can be transplanted in the cleared fat pad where it has the potential to extend mammary ductal trees through out the fat pad. This procedure has been utilized in many experimental models including the examination of tumor phenotype in transgenic mammary epithelial tissue without the confounding effects of genotype on the entire animal3, in the identification of mammary stem cells by transplanting cells in limited dilution4,5, determining if hyperplastic nodules proceed to mammary tumors6, and to assess the effect of prior hormone exposure on the behavior of the mammary epithelium7,8.
Three week old host mice are anesthetized, cleaned and restrained on a surgical stage. A mid-sagittal incision is made through the skin, but not the peritoneum, extending from the pubis to the sternum. Oblique cuts are made through the skin from the mid-sagittal incision across the pelvis toward each leg. The skin is pulled away from the peritoneum to expose the 4th inguinal mammary gland. The fat pad is cleared by removing the fat pad tissue anterior to the lymph node. Epithelium fragments or epithelial cells are transplanted into the remaining cleared fat pad and the mouse is closed.

This article demonstrates the procedure developed by DeOme KB et al. (1959) and the sparing procedure developed by Brill B et al. (2008) for clearing the 4th inguinal mammary fat pad of a pubescent mouse in preparation for transplantation of mammary fragments, mammary epithelial cells, or mammary tumor cells.

زرع الثدي الداخلي طلائي

This article describes and compares the fat pad clearance procedure developed by DeOme KB et al.1 and the sparing procedure developed by Brill B et al.2, ...

Isolation and Culture of Adult Epithelial Stem Cells from Human Skin

The homeostasis of all self-renewing tissues is dependent on adult stem cells. As undifferentiated stem cells undergo asymmetric divisions, they generate daughter cells that retain the stem cell phenotype and transit-amplifying cells (TA cells) that migrate from the stem cell niche, undergo rapid proliferation and terminally differentiate to repopulate the tissue.
Epithelial stem cells have been identified in the epidermis, hair follicle, and intestine as cells with a high in vitro proliferative potential and as slow-cycling label-retaining cells in vivo 1-3. Adult, tissue-specific stem cells are responsible for the regeneration of the tissues in which they reside during normal physiologic turnover as well as during times of stress 4-5. Moreover, stem cells are generally considered to be multi-potent, possessing the capacity to give rise to multiple cell types within the tissue 6. For example, rodent hair follicle stem cells can generate epidermis, sebaceous glands, and hair follicles 7-9. We have shown that stem cells from the human hair follicle bulge region exhibit multi-potentiality 10.
Stem cells have become a valuable tool in biomedical research, due to their utility as an in vitro system for studying developmental biology, differentiation, tumorigenesis and for their possible therapeutic utility. It is likely that adult epithelial stem cells will be useful in the treatment of diseases such as ectodermal dysplasias, monilethrix, Netherton syndrome, Menkes disease, hereditary epidermolysis bullosa and alopecias 11-13. Additionally, other skin problems such as burn wounds, chronic wounds and ulcers will benefit from stem cell related therapies 14,15. Given the potential for reprogramming of adult cells into a pluripotent state (iPS cells)16,17, the readily accessible and expandable adult stem cells in human skin may provide a valuable source of cells for induction and downstream therapy for a wide range of disease including diabetes and Parkinson's disease.

A rapid, robust way of isolating viable adult epithelial stem cells from human skin is described. The method utilizes enzymatic digestion of skin collagen matrix , followed by plucking of hair follicles and isolation of single cell suspensions or tissue fragments for cell culture.

العزلة وثقافة الكبار الخلايا الجذعية الظهارية من الجلد البشري

The homeostasis of all self-renewing tissues is dependent on adult stem cells. As undifferentiated stem cells undergo asymmetric divisions, they generate ...

Chromatin Isolation by RNA Purification (ChIRP)

Long noncoding RNAs are key regulators of chromatin states for important biological processes such as dosage compensation, imprinting, and developmental gene expression 1,2,3,4,5,6,7. The recent discovery of thousands of lncRNAs in association with specific chromatin modification complexes, such as Polycomb Repressive Complex 2 (PRC2) that mediates histone H3 lysine 27 trimethylation (H3K27me3), suggests broad roles for numerous lncRNAs in managing chromatin states in a gene-specific fashion 8,9. While some lncRNAs are thought to work in cis on neighboring genes, other lncRNAs work in trans to regulate distantly located genes. For instance, Drosophila lncRNAs roX1 and roX2 bind numerous regions on the X chromosome of male cells, and are critical for dosage compensation 10,11. However, the exact locations of their binding sites are not known at high resolution. Similarly, human lncRNA HOTAIR can affect PRC2 occupancy on hundreds of genes genome-wide 3,12,13, but how specificity is achieved is unclear. LncRNAs can also serve as modular scaffolds to recruit the assembly of multiple protein complexes. The classic trans-acting RNA scaffold is the TERC RNA that serves as the template and scaffold for the telomerase complex 14; HOTAIR can also serve as a scaffold for PRC2 and a H3K4 demethylase complex 13.
Prior studies mapping RNA occupancy at chromatin have revealed substantial insights 15,16, but only at a single gene locus at a time. The occupancy sites of most lncRNAs are not known, and the roles of lncRNAs in chromatin regulation have been mostly inferred from the indirect effects of lncRNA perturbation. Just as chromatin immunoprecipitation followed by microarray or deep sequencing (ChIP-chip or ChIP-seq, respectively) has greatly improved our understanding of protein-DNA interactions on a genomic scale, here we illustrate a recently published strategy to map long RNA occupancy genome-wide at high resolution 17. This method, Chromatin Isolation by RNA Purification (ChIRP) (Figure 1), is based on affinity capture of target lncRNA:chromatin complex by tiling antisense-oligos, which then generates a map of genomic binding sites at a resolution of several hundred bases with high sensitivity and low background. ChIRP is applicable to many lncRNAs because the design of affinity-probes is straightforward given the RNA sequence and requires no knowledge of the RNA's structure or functional domains.

Chromatin Isolation by RNA Purification ChIRP

ChIRP is a novel and rapid technique to map genomic binding sites of long noncoding RNAs (lncRNAs). The method takes advantage of the specificity of anti-sense tiling oligonucleotides to allow the enumeration of lncRNA-bound genomic sites.

لونين عزل من قبل تنقية الحمض النووي الريبي (السقسقة)

Long noncoding RNAs are key regulators of chromatin states for important biological processes such as dosage compensation, imprinting, and developmental ...

Induction and Analysis of Epithelial to Mesenchymal Transition

Epithelial to mesenchymal transition (EMT) is essential for proper morphogenesis during development. Misregulation of this process has been implicated as a key event in fibrosis and the progression of carcinomas to a metastatic state. Understanding the processes that underlie EMT is imperative for the early diagnosis and clinical control of these disease states. Reliable induction of EMT in vitro is a useful tool for drug discovery as well as to identify common gene expression signatures for diagnostic purposes. Here we demonstrate a straightforward method for the induction of EMT in a variety of cell types. Methods for the analysis of cells pre- and post-EMT induction by immunocytochemistry are also included. Additionally, we demonstrate the effectiveness of this method through antibody-based array analysis and migration/invasion assays.

A straightforward method is described for the induction of epithelial to mesenchymal transition (EMT) in a variety of cell types. Methods for the analysis of cells in EMT states by immunocytochemistry are included.

الاستقراء وتحليل الظهارية الوسيطة الانتقالية ل

Epithelial  to mesenchymal transition (EMT) is essential for proper morphogenesis during  development. Misregulation of this  process has been implicated ...

Isolation and Culture of Dental Epithelial Stem Cells from the Adult Mouse Incisor

Understanding the cellular and molecular mechanisms that underlie tooth regeneration and renewal has become a topic of great interest1-4, and the mouse incisor provides a model for these processes. This remarkable organ grows continuously throughout the animal&#39;s life and generates all the necessary cell types from active pools of adult stem cells housed in the labial (toward the lip) and lingual (toward the tongue) cervical loop (CL) regions. Only the dental stem cells from the labial CL give rise to ameloblasts that generate enamel, the outer covering of teeth, on the labial surface. This asymmetric enamel formation allows abrasion at the incisor tip, and progenitors and stem cells in the proximal incisor ensure that the dental tissues are constantly replenished. The ability to isolate and grow these progenitor or stem cells in vitro allows their expansion and opens doors to numerous experiments not achievable in vivo, such as high throughput testing of potential stem cell regulatory factors. Here, we describe and demonstrate a reliable and consistent method to culture cells from the labial CL of the mouse incisor.

The continuously growing mouse incisor provides a model for studying renewal of dental tissues from dental epithelial stem cells (DESCs). A robust system for consistently and reliably obtaining these cells from the incisor and expanding them in vitro is reported here.

العزلة وثقافة الأسنان طلائي الخلايا الجذعية من الكبار ماوس القاطعة

Understanding the cellular and molecular mechanisms that underlie tooth regeneration and renewal has become a topic of great interest1-4, and the mouse ...

Evaluating the Angiogenetic Properties of Ovarian Cancer Stem-Like Cells using the Three-Dimensional Co-Culture System, NICO-1

Cancer stem cells (CSCs) reside in a supportive niche, constituting a microenvironment comprised of adjacent stromal cells, vessels, and extracellular matrix. The ability of CSCs to participate in the development of endothelium constitutes an important characteristic that directly contributes to the general understanding of the mechanisms of tumorigenesis and tumor metastasis. The purpose of this work is to establish a reproducible methodology to investigate the tumor-initiation capability of ovarian cancer stem cells (OCSCs). Herein, we examined the neovascularization mechanism between endothelial cells and OCSCs along with the morphological changes of endothelial cells using the in vitro co-culture model NICO-1. This protocol allows visualization of the neovascularization step surrounding the OCSCs in a time course manner. The technique can provide insight regarding the angiogenetic properties of OCSCs in tumor metastasis.

Ovarian cancer stem cells (OCSC) are responsible for cancer initiation, recurrence, therapeutic resistance, and metastasis. The OCSC vascular niche is considered to promote self-renewal of OCSCs, leading to chemoresistance. This protocol provides the basis for establishing a reproducible OCSC vascular niche model in vitro.

تقييم الخصائص الوعائية الوراثية للخلايا الشبيهة بسرطان المبيض باستخدام نظام الثقافة المشتركة ثلاثي الأبعاد ، NICO-1

Cancer stem cells (CSCs) reside in a supportive niche, constituting a microenvironment comprised of adjacent stromal cells, vessels, and extracellular ...

Staining and High-Resolution Imaging of Three-Dimensional Organoid and Spheroid Models

In vitro three-dimensional (3D) cell culture models, such as organoids and spheroids, are valuable tools for many applications including development and disease modeling, drug discovery, and regenerative medicine. To fully exploit these models, it is crucial to study them at cellular and subcellular levels. However, characterizing such in vitro 3D cell culture models can be technically challenging and requires specific expertise to perform effective analyses. Here, this paper provides detailed, robust, and complementary protocols to perform staining and subcellular resolution imaging of fixed in vitro 3D cell culture models ranging from 100 &#181;m to several millimeters. These protocols are applicable to a wide variety of organoids and spheroids that differ in their cell-of-origin, morphology, and culture conditions. From 3D structure harvesting to image analysis, these protocols can be completed within 4-5 days. Briefly, 3D structures are collected, fixed, and can then be processed either through paraffin-embedding and histological/immunohistochemical staining, or directly immunolabeled and prepared for optical clearing and 3D reconstruction (200 &#181;m depth) by confocal microscopy.

Here, we provide detailed, robust, and complementary protocols to perform staining and subcellular resolution imaging of fixed three-dimensional cell culture models ranging from 100 &#181;m to several millimeters, thus enabling the visualization of their morphology, cell-type composition, and interactions.

تلطيخ وتصوير عالي الدقة لنماذج عضوية وكروية ثلاثية الأبعاد

In vitro three-dimensional (3D) cell culture models, such as organoids and spheroids, are valuable tools for many applications including development and ...

Isolation of Epithelial Cells from Human Dental Follicle

The dental follicle (DF) was harvested during the removal of an impacted third molar by an oral maxillofacial surgeon. Epithelial cell isolation was performed on the day of DF harvest. The DF was washed three times with DPBS and then dissected with tissue scissors until the tissue had a pulpy or squishy consistency. Single-cell populations were pelleted by centrifugation and washed with keratinocyte serum-free medium. Heterogeneous cell populations were distributed in a culture dish. Keratinocyte serum-free medium was used to select the epithelial cells. The culture medium was changed daily until no floating debris or dead cells were observed. Epithelial cells appeared within 7-10 days after cell population distribution. Epithelial cells survived in serum-free medium, while &#945;-modification minimal essential medium supplemented with 10% fetal bovine serum allowed the proliferation of mesenchymal-type cells. The DF is a tissue source for the isolation of dental epithelial cells.
The purpose of this study was to establish a method for the isolation of epithelial cells from human DF. Periodontal ligament (PDL) was used for the isolation of human dental epithelial cells. Procuring epithelial cells from human PDL is not always successful due to the small tissue volume, leading to low numbers of epithelial cells. DF has a larger volume than PDL and contains more cells. DF can be a tissue source for the primary culture of human dental epithelial cells. This protocol is easier and more efficient than the isolation method using PDL. Procuring human dental epithelial cells may facilitate further studies of dental epithelial-mesenchymal interactions.

The dental follicle contains an epithelial population and mesenchymal cells. The epithelial population was selected from the heterogeneous dental follicle cell population by providing a distinct culture medium. Epithelial cells survived and formed colonies in a serum-free medium.

عزل الخلايا الظهارية من بصيلات الأسنان البشرية

The dental follicle (DF) was harvested during the removal of an impacted third molar by an oral maxillofacial surgeon. Epithelial cell isolation was ...