Name: observing and quantifying fibroblast-mediated fibrin gel compaction
Uploaded: 2014-01-16T13:45:00
Description: Watch this Scientific Journal Video about Observing and Quantifying Fibroblast-mediated Fibrin Gel Compaction at JoVE.com

Мы благодарим Джорджа Джудиче и Стивена Элиасона за пожертвование человеческих кожных фибробластов и Рамеша Рагупатии за помощь в алгоритме отслеживания штаммов. Поддержку этой работе оказал Департамент образования США по оказанию помощи выпускникам в областях национальной стипендии (GAANN P200A120071).

1. Подготовка к трафарету
Подготовь трафарет на Парафильме, чтобы сабографить расположение каждого экспланта, следуя желаемойгеометрии (рисунки 1A и 1B). Пространство каждого explant примерно 1-2 мм друг от друга. Это расстояние соответствует идеально...

<ol>
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Этот протокол был разработан с целью наблюдения и количественной оценки механики, участвуют в клеточной ремоделирования ECM. Такие процессы лежат в основе ряда биологических явлений и имеют важныепоследствия для инженерных тканей 2,22,уменьшая шрам 1,23, и понимание патологиче...

Важным инструментом для изучения клеточно-матричных взаимодействий является клеток, населенных коллагеновымгелем 1,2. Гель обеспечивает 3D среду, которая ближе к in vivo характер ткани и лучше подходит для понимания поведения клеток, чем предлагается традиционными 2D культур3. Ранние исследования, в которых фибробласты были однородно распределены в коллагеновый гель обнаружили, что клетки быстро консолидировать коллагеновые волокна и компактныйгель 4,5. Контрактные фибробласты в свободных плавающих гелях затем переходят в состояние добела вскоре после того, как гель полностью достигуплотнения 1,6,7. Фибробласты в гелях, которые ограничены на границах, остаются в активном,синтетическом состоянии 8 и генерируют выравнивание волокон таким образом, в зависимости от геометриигеля и внешних ограничений 5,9. Различия в активности клеток, как представляется, в результате внутреннего напряжения (или его отсутствие), которое развивается, как клетки оказывают силы тяги через интегрны на коллагеновых волокон в гель.
Вариант этого метода включает в себя размещение фибробластов explants(т.е. скопления клеток) на расстоянии друг от друга в коллагеновом геле и наблюдения клеточной матрицы взаимодействия и постепенное развитие волокна выравнивание между explants (иногда называемые связки, как ремни)10-12. Основным преимуществом системы эксплантов является то, что она позволяет упорядочить клетки в простые геометрические узоры, что облегчает визуализацию и зондирование механизмов, лежащих в основе перестройки волокон, управляемых клетками. Эти модели выравнивания - которые зависят главным образом от взаимодействия между силами тяги клетки, spatial распределением клетки, геометрией геля, и механически ограничениями на геле - важны для того чтобы понять потому что они играют центральную роль в глобальной организации ткани, механически функции, и местноймеханической окружающей среде 13.
В области тканевой инженерии, одна стратегия для производства механически функциональных, инженерии тканей включает в себя контроль волокна выравнивание шаблон, который развивается из уплотнения клеток, так что инженерии ткани обладает волокна выравнивание, которое имитирует, что изродной ткани 14,15. Такое выравнивание считается необходимым для инженерных тканей, чтобы повторить сложное механическое поведение местных тканей. Модификация этой стратегии заключается в замене коллагенового геля фибрином гель16. Фибрин гель развивается аналогичная модель выравнивания, как коллагеновый гель во время уплотнения. Со временем фибрин деградирует и заменяется синтезированными клетками ECM, что следует первоначальному шаблону выравнивания фибринового волокна. Полученная конструкция значительно улучшила механические свойства по сравнению с коллагеновым гелем, полученным конструкцией17.
Процесс выравнивания и последующей реконструкции событий в фибриновых гелях проходить в сложной и плохо понятой манере. Чтобы лучше охарактеризовать эти взаимодействия и их влияние на поведение клеток и ЭКМ ремоделирование, мы разработали процедуру, которая основана на методе экспланта. В этом методе фибробласты explants расположены на фибриновом геле в различных геометрических узоров. Гели поддерживаются в экологически контролируемом, микроскоп-установленбиореакторе 18, и процесс уплотнения и перестройки волокна контролируется с помощью контрастной по времени дифференциальной интерференционной микроскопии (DIC). Поля перемещения количественно определены с помощью пользовательских алгоритмов. Данные, полученные в ходе этих экспериментов, имеют широкий спектр последствий для ряда процессов, включая оптимизацию стратегий проектирования тканей, улучшение заживления ран и лечение ремоделирования патологических тканей.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>Sigma-Aldrich</td>
			<td>F8630</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sigma-Aldrich</td>
			<td>T4648</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Gibco</td>
			<td>11965-092</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Gibco</td>
			<td>15140-122</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sigma-Aldrich</td>
			<td>A2942</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sigma-Aldrich</td>
			<td>H0887</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sigma-Aldrich</td>
			<td>223506</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Gibco</td>
			<td>25200-056</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Invitrogen</td>
			<td>3000</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Lonza</td>
			<td>DE14-701F</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Molecular Probes</td>
			<td>F8858</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">GIBCO</td>
			<td>A10483-01</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">GIBCO</td>
			<td>11430-030</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Fisher-Scientific</td>
			<td>SS264-1</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sigma-Aldrich</td>
			<td>A3428-25MG</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:297px;">Biotense Bioreactor</td>
			<td style="width:85px;">ADMET</td>
			<td style="width:125px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Ti-Eclipe Microscope</td>
			<td>Nikon</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;"># 0 35 mm Glass Bottom Petri Dish</td>
			<td>MatTek</td>
			<td>P35G-0-20-C</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;"># 0 35 mm Glass Top Petri Dish</td>
			<td>MatTek</td>
			<td>P35GTOP-0-20-C</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Plastic Luer fittings, PVC tubing with Luer ends</td>
			<td>Cole-Parmer</td>
			<td>30600-65</td>
		</tr>
	</tbody>
</table>

observing and quantifying fibroblast-mediated fibrin gel compaction

Клетки, встроенные в коллагеновые и фибринные гели, прикрепляют и оказывают тяговые силы на волокна геля. Эти силы могут привести к локальной и глобальной реорганизации и перестройке микроструктуры геля. Этот процесс проходит сложным образом, что частично зависит от взаимодействия между расположением клеток, геометрией геля и механическими ограничениями на гель. Чтобы лучше понять, как эти переменные производят глобальные модели выравнивания волокон, мы используем микроскопию дифференциального интерференции (DIC) замедленного действия (DIC) в сочетании с экологически контролируемым биореактором для наблюдения за процессом уплотнения между геометрически распропоискными эксплантами (кластерами фибробластов). Изображения затем анализируются с помощью пользовательского алгоритма обработки изображений для получения карт штамма. Информация, полученная из этого метода может быть использована для зондирования механобиологии различных клеточно-матричных взаимодействий, которая имеет важные последствия для понимания процессов в заживлении ран, развитии болезней и тканевой инженерии приложений.

Ткань ремоделирования является сложным процессом, который обусловлен частично взаимных физических взаимодействий между клетками и окружающей матрицы. Клетки реорганизуют окружающие волокна и создают напряжение в волоконной сети. Выравнивание волокон и механической среды, в свою оч?...

Watch this Scientific Journal Video about Observing and Quantifying Fibroblast-mediated Fibrin Gel Compaction at JoVE.com

Observing and Quantifying Fibroblast-mediated Fibrin Gel Compaction

Для наблюдения и анализа фибробластного уплотнения геля и перестройки фибринового волокна в экологически контролируемом биореакторе в течение 48 часов использовались методы обработки во времени и обработки изображений.

Наблюдение и количественная оценка Фибробластовой Фибрин Гель Компактион

Cells embedded in collagen and fibrin gels attach and exert traction forces on the fibers of the gel. These forces can lead to local and global ...

observing-and-quantifying-fibroblast-mediated-fibrin-gel-compaction

Research

JoVE Journal

Bioengineering

Preparation of Complaint Matrices for Quantifying Cellular Contraction

The regulation of cellular adhesion to the extracellular matrix (ECM) is essential for cell migration and ECM remodeling. Focal adhesions are macromolecular assemblies that couple the contractile F-actin cytoskeleton to the ECM. This connection allows for the transmission of intracellular mechanical forces across the cell membrane to the underlying substrate. Recent work has shown the mechanical properties of the ECM regulate focal adhesion and F-actin morphology as well as numerous physiological processes, including cell differentiation, division, proliferation and migration. Thus, the use of cell culture substrates has become an increasingly prevalent method to precisely control and modulate ECM mechanical properties.
To quantify traction forces at focal adhesions in an adherent cell, compliant substrates are used in conjunction with high-resolution imaging and computational techniques in a method termed traction force microscopy (TFM). This technique relies on measurements of the local magnitude and direction of substrate deformations induced by cellular contraction. In combination with high-resolution fluorescence microscopy of fluorescently tagged proteins, it is possible to correlate cytoskeletal organization and remodeling with traction forces.
Here we present a detailed experimental protocol for the preparation of two-dimensional, compliant matrices for the purpose of creating a cell culture substrate with a well-characterized, tunable mechanical stiffness, which is suitable for measuring cellular contraction. These protocols include the fabrication of polyacrylamide hydrogels, coating of ECM proteins on such gels, plating cells on gels, and high-resolution confocal microscopy using a perfusion chamber. Additionally, we provide a representative sample of data demonstrating location and magnitude of cellular forces using cited TFM protocols.

In this video, we demonstrate the experimental techniques used to fabricate compliant, extracellular matrix (ECM) coated substrates suitable for cell culture, and which are amenable to traction force microscopy and observing effects of ECM stiffness on cell behavior.

Подготовка жалобы матриц для Количественная Сотовая Сокращение

The regulation of cellular adhesion to the extracellular matrix (ECM) is essential for cell migration and ECM remodeling.  Focal adhesions are ...

Fabrication of Micro-tissues using Modules of Collagen Gel Containing Cells

This protocol describes the fabrication of a type of micro-tissues called modules.  The module approach generates uniform, scalable and vascularized tissues.  The modules can be made of collagen as well as other gelable or crosslinkable materials.  They are approximately 2 mm in length and 0.7 mm in diameter upon fabrication but shrink in size with embedded cells or when the modules are coated with endothelial cells.  The modules individually are small enough that the embedded cells are within the diffusion limit of oxygen and other nutrients but modules can be packed together to form larger tissues that are perfusable.  These tissues are modular in construction because different cell types can be embedded in or coated on the modules before they are packed together to form complex tissues.  There are three main steps to making the modules: (1) neutralizing the collagen and embedding cells in it, (2) gelling the collagen in the tube and cutting the modules and (3) coating the modules with endothelial cells.

Creation of micro-tissues using cylindrical collagen gels, called modules, that contain embedded cells and which surface is coated with endothelial cells.

Изготовление Micro-тканей с использованием модулей Коллаген гель, содержащий клетки

This protocol describes the fabrication of a type of micro-tissues called modules.  The module approach generates uniform, scalable and vascularized ...

Encapsulation of Cardiomyocytes in a Fibrin Hydrogel for Cardiac Tissue Engineering

Culturing cells in a three dimensional hydrogel environment is an important technique for developing constructs for tissue engineering as well as studying cellular responses under various culture conditions in vitro. The three dimensional environment more closely mimics what the cells observe in vivo due to the application of mechanical and chemical stimuli in all dimensions 1. Three-dimensional hydrogels can either be made from synthetic polymers such as PEG-DA 2 and PLGA 3 or a number of naturally occurring proteins such as collagen 4, hyaluronic acid 5 or fibrin 6,7. Hydrogels created from fibrin, a naturally occurring blood clotting protein, can polymerize to form a mesh that is part of the body's natural wound healing processes 8. Fibrin is cell-degradable and potentially autologous 9, making it an ideal temporary scaffold for tissue engineering.
Here we describe in detail the isolation of neonatal cardiomyocytes from three day old rat pups and the preparation of the cells for encapsulation in fibrin hydrogel constructs for tissue engineering. Neonatal myocytes are a common cell source used for in vitro studies in cardiac tissue formation and engineering 4. Fibrin gel is created by mixing fibrinogen with the enzyme thrombin. Thrombin cleaves fibrinopeptides FpA and FpB from fibrinogen, revealing binding sites that interact with other monomers 10. These interactions cause the monomers to self-assemble into fibers that form the hydrogel mesh. Because the timing of this enzymatic reaction can be adjusted by altering the ratio of thrombin to fibrinogen, or the ratio of calcium to thrombin, one can injection mold constructs with a number of different geometries 11,12. Further we can generate alignment of the resulting tissue by how we constrain the gel during culture 13.
After culturing the engineered cardiac tissue constructs for two weeks under static conditions, the cardiac cells have begun to remodel the construct and can generate a contraction force under electrical pacing conditions 6. As part of this protocol, we also describe methods for analyzing the tissue engineered myocardium after the culture period including functional analysis of the active force generated by the cardiac muscle construct upon electrical stimulation, as well as methods for determining final cell viability (Live-Dead assay) and immunohistological staining to examine the expression and morphology of typical proteins important for contraction (Myosin Heavy Chain or MHC) and cellular coupling (Connexin 43 or Cx43) between myocytes.

We describe the isolation of neonatal cardiomyocytes and the preparation of the cells for encapsulation in fibrin hydrogel constructs for tissue engineering. We describe methods for analyzing the tissue engineered myocardium after the culture period including active force generated upon electrical stimulation and cell viability and immunohistological staining.

Инкапсуляция кардиомиоцитов в Фибрин Гидрогель для сердечной тканевой инженерии

Culturing cells in a three dimensional hydrogel environment is an important technique for developing constructs for tissue engineering as well as studying ...

Preparation of 3D Fibrin Scaffolds for Stem Cell Culture Applications

Stem cells are found in naturally occurring 3D microenvironments in vivo, which are often referred to as the stem cell niche 1. Culturing stem cells inside of 3D biomaterial scaffolds provides a way to accurately mimic these microenvironments, providing an advantage over traditional 2D culture methods using polystyrene as well as a method for engineering replacement tissues 2. While 2D tissue culture polystrene has been used for the majority of cell culture experiments, 3D biomaterial scaffolds can more closely replicate the microenvironments found in vivo by enabling more accurate establishment of cell polarity in the environment and possessing biochemical and mechanical properties similar to soft tissue.3 A variety of naturally derived and synthetic biomaterial scaffolds have been investigated as 3D environments for supporting stem cell growth. While synthetic scaffolds can be synthesized to have a greater range of mechanical and chemical properties and often have greater reproducibility, natural biomaterials are often composed of proteins and polysaccharides found in the extracelluar matrix and as a result contain binding sites for cell adhesion and readily support cell culture. Fibrin scaffolds, produced by polymerizing the protein fibrinogen obtained from plasma, have been widely investigated for a variety of tissue engineering applications both in vitro and in vivo 4. Such scaffolds can be modified using a variety of methods to incorporate controlled release systems for delivering therapeutic factors 5. Previous work has shown that such scaffolds can be used to successfully culture embryonic stem cells and this scaffold-based culture system can be used to screen the effects of various growth factors on the differentiation of the stem cells seeded inside 6,7.
 This protocol details the process of polymerizing fibrin scaffolds from fibrinogen solutions using the enzymatic activity of thrombin. The process takes 2 days to complete, including an overnight dialysis step for the fibrinogen solution to remove citrates that inhibit polymerization. These detailed methods rely on fibrinogen concentrations determined to be optimal for embryonic and induced pluripotent stem cell culture. Other groups have further investigated fibrin scaffolds for a wide range of cell types and applications - demonstrating the versatility of this approach 8-12.

This work details the preparation of 3D fibrin scaffolds for culturing and differentiating plutipotent stem cells. Such scaffolds can be used to screen the effects of various biological compounds on stem cell behavior as well as modified to contain drug delivery systems.

Подготовка 3D фибрина лесов для стволовых Приложения культуре клеток

Stem cells are found in naturally occurring 3D microenvironments in vivo, which are often referred to as the stem cell niche 1. Culturing stem cells ...

Engineering Fibrin-based Tissue Constructs from Myofibroblasts and Application of Constraints and Strain to Induce Cell and Collagen Reorganization

Collagen content and organization in developing collagenous tissues can be influenced by local tissue strains and tissue constraint. Tissue engineers aim to use these principles to create tissues with predefined collagen architectures. A full understanding of the exact underlying processes of collagen remodeling to control the final tissue architecture, however, is lacking. In particular, little is known about the (re)orientation of collagen fibers in response to changes in tissue mechanical loading conditions. We developed an in&#160;vitro model system, consisting of biaxially-constrained myofibroblast-seeded fibrin constructs, to further elucidate collagen (re)orientation in response to i) reverting biaxial to uniaxial static loading conditions and ii) cyclic uniaxial loading of the biaxially-constrained constructs before and after a change in loading direction, with use of the Flexcell FX4000T loading device. Time-lapse confocal imaging is used to visualize collagen (re)orientation in a nondestructive manner.
Cell and collagen organization in the constructs can be visualized in real-time, and an internal reference system allows us to relocate cells and collagen structures for time-lapse analysis. Various aspects of the model system can be adjusted, like cell source or use of healthy and diseased cells. Additives can be used to further elucidate mechanisms underlying collagen remodeling, by for example adding MMPs or blocking integrins. Shape and size of the construct can be easily adapted to specific needs, resulting in a highly tunable model system to study cell and collagen (re)organization.

This model system starts from a myofibroblast-populated fibrin gel that can be used to study endogenous collagen (re)organization real-time in a nondestructive manner. The model system is very tunable, as it can be used with different cell sources, medium additives, and can be adapted easily to specific needs.

Инженерные основе фибрина тканей Конструкции из Миофибробласты и применение ограничений и напрягаться, чтобы индуцировать клеточную и коллагена (Re) организации

Collagen content and organization in developing collagenous tissues can be influenced by local tissue strains and tissue constraint. Tissue engineers aim ...

Characterization of Leukocyte-platelet Rich Fibrin, A Novel Biomaterial

Autologous platelet concentrates represent promising innovative tools in the field of regenerative medicine and have been extensively used in oral surgery. Unlike platelet rich plasma (PRP) that is a gel or a suspension, Leukocyte-Platelet Rich Fibrin (L-PRF) is a solid 3D fibrin membrane generated chair-side from whole blood containing no anti-coagulant. The membrane has a dense three dimensional fibrin matrix with enriched platelets and abundant growth factors. L-PRF is a popular adjunct in surgeries because of its superior handling characteristics as well as its suturability to the wound bed. The goal of the study is to demonstrate generation as well as provide detailed characterization of relevant properties of L-PRF that underlie its clinical success.

Leucocyte-Platelet Rich Fibrin (L-PRF) represents an FDA cleared preparation of autologous platelet concentrates that possesses unique fibrin architecture, enriched platelets and abundant growth factors. Here, we present a protocol for chair-side generation of L-PRF as well as evaluate its mechanical properties including uniaxial testing and suture retention strength testing.

Характеристика лейкоцитов тромбоцитов Rich фибрина, роман биоматериала

Autologous platelet concentrates represent promising innovative tools in the field of regenerative medicine and have been extensively used in oral ...

Forming Giant-sized Polymersomes Using Gel-assisted Rehydration

Polymer vesicles, or polymersomes, are being widely explored as synthetic analogs of lipid vesicles based on their stability, robustness, barrier properties, chemical versatility and tunable physical characteristics. Typical methods used to prepare giant-sized (&gt; 4 &#181;m) vesicles, however, are both time and labor intensive, yielding low numbers of intact polymersomes. Here, we present for the first time the use of gel-assisted rehydration for the rapid and high-yielding formation of giant (&gt;4 &#181;m) polymer vesicles (polymersomes). Using this method, polymersomes can be formed from a wide array of rehydration solutions including several different physiologically-compatible buffers and full cell culture media, making them readily useful for biomimicry studies. This technique is also capable of reliably producing polymersomes from different polymer compositions with far better yields and much less difficulty than traditional methods. Polymersome size is readily tunable by altering temperature during rehydration or adding membrane fluidizers to the polymer membrane, generating giant-sized polymersomes (&gt;100 &#181;m).

We present a protocol to rapidly form giant polymer vesicles (pGVs). Briefly, polymer solutions are dehydrated on dried agarose films adhered to coverslips. Rehydration of the polymer films results in rapid formation of pGVs. This method greatly advances the preparation of synthetic giant vesicles for direct applications in biomimetic studies.

Формирование гигантского размера Polymersomes гель-регидратация при содействии

Polymer vesicles, or polymersomes, are being widely explored as synthetic analogs of lipid vesicles based on their stability, robustness, barrier ...

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

Intraoperative imaging techniques have the potential to make surgical interventions safer and more effective; for these reasons, such techniques are quickly moving into the operating room. Here, we present a new approach that utilizes a technique not yet explored for intraoperative imaging: chemiluminescent imaging. This method employs a ruthenium-based chemiluminescent reporter along with a custom-built nebulizing system to produce ex vivo or in vivo images with high signal-to-noise ratios. The ruthenium-based reporter produces light following exposure to an aqueous oxidizing solution and re-reduction within the surrounding tissue. This method has allowed us to detect reporter concentrations as low as 6.9 pmol/cm2. In this work, we present a visual guide to our proof-of-concept in vivo studies involving subdermal and intravenous injections in mice. The results suggest that this technology is a promising candidate for further preclinical research and might ultimately become a useful tool in the operating room.

This protocol describes a new intraoperative imaging technique that uses a ruthenium complex as a source of chemiluminescent light emission, thereby producing high signal-to-noise ratios during in vivo imaging. Intraoperative imaging is an expanding field that could revolutionize the way that surgical procedures are performed.

Новый метод для генерации и наблюдения хемилюминесценции в биологическом Окружение

Intraoperative imaging techniques have the potential to make surgical interventions safer and more effective; for these reasons, such techniques are ...

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

Microfluidic models of hemostasis assess platelet function under conditions of hydrodynamic shear, but in the presence of anticoagulants, this analysis is restricted to platelet deposition only. The intricate relationship between Ca2+-dependent coagulation and platelet function requires careful and controlled recalcification of blood prior to analysis. Our setup uses a Y-shaped mixing channel, which supplies concentrated Ca2+/Mg2+ buffer to flowing blood just prior to perfusion, enabling rapid recalcification without sample stasis. A ten-fold difference in flow velocity between both reservoirs minimizes dilution. The recalcified blood is then perfused in a collagen-coated analysis chamber, and differential labeling permits real-time imaging of both platelet and fibrin deposition using fluorescence video microscopy. The system uses only commercially available tools, increasing the chances of standardization. Reconstitution of thrombocytopenic blood with platelets from banked concentrates furthermore models platelet transfusion, proving its use in this research domain. Exemplary data demonstrated that coagulation onset and fibrin deposition were linearly dependent on the platelet concentration, confirming the relationship between primary and secondary hemostasis in our model. In a timeframe of 16 perfusion min, contact activation did not take place, despite recalcification to normal Ca2+ and Mg2+ levels. When coagulation factor XIIa was inhibited by corn trypsin inhibitor, this time frame was even longer, indicating a considerable dynamic range in which the changes in the procoagulant nature of the platelets can be assessed. Co-immobilization of tissue factor with collagen significantly reduced the time to onset of coagulation, but not its rate. The option to study the tissue factor and/or the contact pathway increases the versatility and utility of the assay.

This paper describes an experimental model of hemostasis that simultaneously measures platelet function and coagulation. Platelet and fibrin fluorescence is measured in real-time, and platelet adhesion rate, coagulation rate, and onset of coagulation are determined. The model is used to determine platelet procoagulant properties under flow in concentrates for transfusion.

Микрожидком Flow камера Модель тромбоцитами трансфузиологии и гемостаза меры тромбоцитов Отложение и фибрина Формирование в режиме реального времени

Microfluidic models of hemostasis assess platelet function under conditions of hydrodynamic shear, but in the presence of anticoagulants, this analysis is ...

Gel-seq: A Method for Simultaneous Sequencing Library Preparation of DNA and RNA Using Hydrogel Matrices

The ability to amplify and sequence either DNA or RNA from small starting samples has only been achieved in the last five years. Unfortunately, the standard protocols for generating genomic or transcriptomic libraries are incompatible and researchers must choose whether to sequence DNA or RNA for a particular sample. Gel-seq solves this problem by enabling researchers to simultaneously prepare libraries for both DNA and RNA starting with 100 - 1000 cells using a simple hydrogel device. This paper presents a detailed approach for the fabrication of the device as well as the biological protocol to generate paired libraries. We designed Gel-seq so that it could be easily implemented by other researchers; many genetics labs already have the necessary equipment to reproduce the Gel-seq device fabrication. Our protocol employs commonly-used kits for both whole-transcript amplification (WTA) and library preparation, which are also likely to be familiar to researchers already versed in generating genomic and transcriptomic libraries. Our approach allows researchers to bring to bear the power of both DNA and RNA sequencing on a single sample without splitting and with negligible added cost.

Gel-seq enables researchers to simultaneously prepare libraries for both DNA- and RNA-seq at negligible added cost starting from 100 - 1000 cells using a simple hydrogel device. This paper presents a detailed approach for the fabrication of the device as well as the biological protocol to generate paired libraries.

Гель seq: Метод для подготовки библиотека одновременных секвенирования ДНК и РНК с помощью матрицы Гидрогель

The ability to amplify and sequence either DNA or RNA from small starting samples has only been achieved in the last five years. Unfortunately, the ...