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Minimum Essential Medium Eagle

低限量 Eagle 培养基

Company: Sigma-Aldrich
Catalog#: M4655
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Generation of Chemically Induced Liver Progenitors (CLiPs) from Rat Adult Hepatocytes
Author:
Date:
2018-01-20
[Abstract]  Primary mature hepatocytes (MHs) or their progenitor cells are candidate cell sources for cell transplantation therapy in severe liver diseases. However, stable culture of these cells or generation of equivalent cells from pluripotent stem cells has been limited. Using a cocktail of small molecules that we previously found useful in stable culture of multiple types of stem/progenitor cells, we recently established a novel method to generate bipotent liver progenitor cells, named chemically induced liver progenitors (CLiPs), from adult rat MHs. Here, we describe a detailed protocol for the induction of rat CLiPs. We first describe the method to isolate primary rat MHs and then describe how to induce CLiPs from these MHs. In addition, we describe a method to evaluate the bipotentiality of ... [摘要]  原代成熟肝细胞(MH)或其祖细胞是重症肝病中细胞移植治疗的候选细胞来源。然而,这些细胞的稳定培养或多能干细胞的等效细胞的产生受到限制。我们使用先前在多种类型的干/祖细胞稳定培养中发现有用的小分子混合物,最近建立了一种从成年大鼠MHs产生双能肝脏祖细胞(命名为化学诱导肝祖细胞(CLiPs))的新方法。在这里,我们描述了诱导大鼠CLiPs的详细方案。我们首先描述分离原代鼠MH的方法,然后描述如何从这些MH中诱导CLiPs。另外,我们描述了一种评估产生的CLiPs分化成肝细胞和胆管上皮细胞的双能性的方法。我们还介绍了如何通过长期的文化和详细的示例数据建立稳定的CLiP。可以在2周内产生初级CLiPs,并且可以在2.5-4个月内建立经历10次传代的稳定的CLiPs,批次间变异性。
【背景】对于实现肝病再生医学的新型细胞来源有着强烈的需求。目前唯一的治疗终末期肝病的方法是肝移植,但是由于供者短缺,其应用受到限制。最近,我们小组提出了一种产生能够在体外稳定地扩增的新型LPC的方法,并且可以以广泛的效率重新繁殖慢性肝炎动物模型的损伤肝脏(Katsuda等人, / ...

Purification and Identification of Novel Host-derived Factors for Influenza Virus Replication from Human Nuclear Extracts
Author:
Date:
2016-09-20
[Abstract]  Recently, we identified two host cell-derived proteins as novel stimulatory factors of influenza virus RNA replication process, termed “Influenza virus REplication Factor-2 (IREF-2)”, from human nuclear extracts (NEs) by employing biochemical complementation assays (Sugiyama et al., 2015). Herein, we describe detailed methods for successive procedures for identification and purification of IREF-2, including large-scale suspension culture of HeLa S3 cells, preparation of NEs and separation of IREF-2 by sequential column chromatography steps. This protocol can be modified and used for purification and identification of the other unknown nuclear protein(s) of your interest. [摘要]  最近,我们通过使用生物化学互补试验(Sugiyama),从人类核提取物(NE)鉴定了两种宿主细胞衍生蛋白作为流感病毒RNA复制过程的新型刺激因子,称为“流感病毒复制因子-2(IREF-2)” et al。,2015)。 本文描述了用于IREF-2鉴定和纯化的连续方法的详细方法,包括HeLa S3细胞的大规模悬浮培养,NE的制备和顺序柱色谱步骤分离IREF-2。 该方案可以修改并用于纯化和鉴定您感兴趣的其他未知核蛋白。
【背景】甲型流感病毒基因组由8个分段和单链RNA(vRNA)组成。其转录和复制由病毒编码的RNA依赖性RNA聚合酶(RdRP)催化。几条证据表明某些宿主衍生因子调节病毒RNA合成(Nagata et al。,2008)。最近,通过相互作用分析和基因组RNAi筛选研究,已经报道了各种宿主衍生的蛋白质作为与病毒RNA合成相关的调节因子候选物。然而,其中包括间接涉及病毒RNA合成的一些假阳性相互作用因子和因子。相反,为了鉴定在病毒RNA合成过程中发挥直接作用的可靠和重要的宿主因子,我们使用了生物化学互补测定系统。在该系统中,在感染的细胞核中有效发生的病毒vRNA复制反应被解剖并在体外使用病毒RNA复制所必需的病毒因子重构,例如衍生自洗涤剂溶解的病毒颗粒的病毒RdRP和模型病毒基因组RNA模板和未感染的核提取物(NE)。
最近,我们已经报道,在体外用病毒因子和NE的粗制部分再现有效的vRNA复制(Sugiyama等,2015)。 ...

Influenza Virus-cell Fusion Inhibition Assay
Author:
Date:
2013-12-20
[Abstract]  During viral infection to host cells, several viruses undergo the process of endocytosis and pH-dependent fusion. By fusion of viral membrane with host cellular membrane, the viral core invades to host cytoplasm. A part of monoclonal antibodies against viral membrane protein have potential to inhibit the viral fusion step. Here we describe in vitro influenza virus-cell fusion inhibition assay. The infected cells expressing viral membrane protein, such as hemagglutinin (HA), on cellular surface are incubated with monoclonal antibodies targeting viral membrane protein. Then the cells are incubated under low pH condition. If the antibody does not inhibit the fusion step, we can see multinucleated giant cells. [摘要]  在病毒感染宿主细胞期间,几种病毒经历内吞作用和pH依赖性融合的过程。 通过病毒膜与宿主细胞膜的融合,病毒核心侵入宿主细胞质。 抗病毒膜蛋白的单克隆抗体的一部分具有抑制病毒融合步骤的潜力。 在这里我们描述了体外流感病毒 - 细胞融合抑制试验。 将表达细胞表面上的病毒膜蛋白(例如血凝素(HA))的感染细胞与靶向病毒膜蛋白的单克隆抗体温育。 然后将细胞在低pH条件下温育。 如果抗体不抑制融合步骤,我们可以看到多核巨细胞。

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