Name: lentiviral-mediated knockdown during ex vivo erythropoiesis of human hematopoietic stem cells
Uploaded: 2011-07-16T14:00:00
Description: Watch this Scientific Journal Video about Lentiviral-mediated Knockdown During Ex Vivo Erythropoiesis of Human Hematopoietic Stem Cells at JoVE.com

Мы благодарим Л. Дуэ и МС Giarratana (Université Paris VI, Франция) за консультацией по бывшей естественных условиях дифференциации эритроидных, Д. Аллан и Х. Аткинс (Огржи, Канада) за предоставление образцов крови (полученные в Оттаве больницы по этике исследований Совет # 2007804-01H), Д. Trono (Ecole Polytechnique Federale Лозанны) для обеспечения лентивирусов векторов и FJ Дилворт (Огржи, Канада) для критически чтении рукописи. Этот проект был профинансирован CIHR гранта (СС-82813), чтобы MBCGP является получателем фонд Ontario вычислительный Обучение Regulomics Докторантура стипендий. МБ заведует кафедрой Канаде исследований в регуляции экспрессии генов.

Part I. ex vivo erythropoiesis of human hematopoietic stem/progenitor cells
1. Isolation of CD34+ human hematopoietic stem/progenitor cells
Human CD34+ cell population, which contains a mixture of hematopoietic stem cells (HSCs) and early progenitors 8, 
is harvested from umbilical cord blood, peripheral blood mobilized with G-CSF (leukapheresis) or bone marrow (Figure 1-Step1). If using cord blood or peripheral 
blood, go direct...

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Ряд методов были использованы ранее дифференцировать эритроидных клеток в культуре с переменным успехом. Например, некоторые протоколы без со-культуры на MS-5 позволяет расширение эритроидных клеток, но не эффективным в производстве полностью зрелых безъядерных эритроцитов 12-17. ...

lentiviral-mediated knockdown during ex vivo erythropoiesis of human hematopoietic stem cells

Erythropoiesis is a commonly used model system to study cell differentiation. During erythropoiesis, pluripotent adult human hematopoietic stem cells (HSCs) differentiate into oligopotent progenitors, committed precursors and mature red blood cells 1. This process is regulated for a large part at the level of gene expression, whereby specific transcription factors activate lineage-specific genes while concomitantly repressing genes that are specific to other cell types 2. Studies on transcription factors regulating erythropoiesis are often performed using human and murine cell lines that represent, to some extent, erythroid cells at given stages of differentiation 3-5. However transformed cell lines can only partially mimic erythroid cells and most importantly they do not allow one to comprehensibly study the dynamic changes that occur as cells progress through many stages towards their final erythroid fate. Therefore, a current challenge remains the development of a protocol to obtain relatively homogenous populations of primary HSCs and erythroid cells at various stages of differentiation in quantities that are sufficient to perform genomics and proteomics experiments.
Here we describe an ex vivo cell culture protocol to induce erythroid differentiation from human hematopoietic stem/progenitor cells that have been isolated from either cord blood, bone marrow, or adult peripheral blood mobilized with G-CSF (leukapheresis). This culture system, initially developed by the Douay laboratory 6, uses cytokines and co-culture on mesenchymal cells to mimic the bone marrow microenvironment. Using this ex vivo differentiation protocol, we observe a strong amplification of erythroid progenitors, an induction of differentiation exclusively towards the erythroid lineage and a complete maturation to the stage of enucleated red blood cells. Thus, this system provides an opportunity to study the molecular mechanism of transcriptional regulation as hematopoietic stem cells progress along the erythroid lineage. 
Studying erythropoiesis at the transcriptional level also requires the ability to over-express or knockdown specific factors in primary erythroid cells. For this purpose, we use a lentivirus-mediated gene delivery system that allows for the efficient infection of both dividing and non-dividing cells 7. Here we show that we are able to efficiently knockdown the transcription factor TAL1 in primary human erythroid cells. In addition, GFP expression demonstrates an efficiency of lentiviral infection close to 90%. Thus, our protocol provides a highly useful system for characterization of the regulatory network of transcription factors that control erythropoiesis.

Watch this Scientific Journal Video about Lentiviral-mediated Knockdown During Ex Vivo Erythropoiesis of Human Hematopoietic Stem Cells at JoVE.com

Lentiviral-mediated Knockdown During Ex Vivo Erythropoiesis of Human Hematopoietic Stem Cells

<em&gt; Исключая виво</em&gt; Протокол для получения зрелых человеческих красных кровяных клеток из стволовых / прародителей описано. Кроме того, мы описываем эффективные лентивирусов-Метод доставки нокдаун TAL1 транскрипционных факторов в первичных эритроидных клеток. Эффективность лентивирус опосредованной доставки гена GFP продемонстрировать с помощью выражения вирусов.

Лентивирусов-опосредованной Нокдаун В Ex Vivo Эритропоэз прав гемопоэтических стволовых клеток

Erythropoiesis is a commonly used model system to study cell differentiation. During erythropoiesis, pluripotent adult human hematopoietic stem cells ...

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Lentiviral-mediated Knockdown During Ex Vivo Erythropoiesis of Human Hematopoietic Stem Cells

Isolation and Transplantation of Hematopoietic Stem Cells (HSCs)

Isolation and Transplantation of Hematopoietic Stem Cells HSCs

Выделение и трансплантации гемопоэтических стволовых клеток (ГСК)

Derivation of Hematopoietic Stem Cells from Murine Embryonic Stem Cells

Вывод гемопоэтических стволовых клеток мышей эмбриональных стволовых клеток

A stem cell is defined as a cell with the capacity to both self-renew and generate multiple differentiated progeny.  Embryonic stem cells (ESC) are ...

Passaging Human Neural Stem Cells

Пассирования правам нервные стволовые клетки

The ability to manipulate human neural stem/precursor cells (hNSPCs) in vitro provides a means to investigate their utility as cell transplants for ...

Isolation and Analysis of Hematopoietic Stem Cells from the Placenta

Выделение и анализ гемопоэтических стволовых клеток из плаценты

Hematopoietic stem cells (HSCs) have the ability to self-renew and generate all cell types of the blood lineages throughout the lifetime of an individual. ...

Isolation of Early Hematopoietic Stem Cells from Murine Yolk Sac and AGM

Изоляция раннего гемопоэтических стволовых клеток мышей желточного мешка и AGM

In the mouse embryo, early hematopoiesis occurs simultaneously in multiple organs, which includes the yolk sac and aorta-gonad-mesonephros region. These ...

Differentiation of Embryonic Stem Cells into Oligodendrocyte Precursors

Дифференциация эмбриональных стволовых клеток в олигодендроцитов прекурсоров

Oligodendrocytes are the myelinating cells of the central nervous system. For regenerative cell therapy in demyelinating diseases, there is significant ...

Ex Vivo Culture of Primary Human Fallopian Tube Epithelial Cells

Ex Vivo Culture of Primary Human Fallopian Tube Epithelial Cells

Экс Vivo культуры первичных человеческих маточных труб эпителиальных клеток

Epithelial ovarian cancer is a leading cause of female cancer mortality in the United States. In contrast to other women-specific cancers, like breast and ...

Phenotypic Analysis and Isolation of Murine Hematopoietic Stem Cells and Lineage-committed Progenitors

Фенотипический анализ и выделение мышей гемопоэтических стволовых клеток и Lineage, совершенных прародителей

The bone marrow is the principal site where HSCs and more mature blood cells lineage progenitors reside and differentiate in an adult organism. HSCs ...

Ex vivo Culture of Mouse Embryonic Skin and Live-imaging of Melanoblast Migration

Ex vivo Culture of Mouse Embryonic Skin and Live-imaging of Melanoblast Migration

Экс естественных Культура мышиных эмбриональных Внешний Live-визуализации меланобластов миграции

Melanoblasts are the neural crest derived precursors of melanocytes; the cells responsible for producing the pigment in skin and hair. Melanoblasts ...

In vivo Clonal Tracking of Hematopoietic Stem and Progenitor Cells Marked by Five Fluorescent Proteins using Confocal and Multiphoton Microscopy

In vivo Clonal Tracking of Hematopoietic Stem and Progenitor Cells Marked by Five Fluorescent Proteins using Confocal and Multiphoton Microscopy

В естественных условиях клоновых Tracking гемопоэтических стволовых и клеток-предшественников оцениваться пятью флуоресцентных белков с помощью конфокальной и многофотонной микроскопии

We developed and validated a fluorescent marking methodology for clonal tracking of hematopoietic stem and progenitor cells (HSPCs) with high spatial and ...