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2 ml SARSTEDT  Tubes

Company: Biodex
Catalog#: 72.693.005
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Generating Three-dimensional Human Granulomas in vitro to Study Mycobacterium tuberculosis-host Interaction
Author:
Date:
2020-11-20
[Abstract]  Granulomas are organized multicellular structures that constitute the hallmark of an infection by the human pathogen Mycobacterium tuberculosis (Mtb). A better understanding of the complex host-Mtb interactions within the granuloma’s environment may lead to new therapeutic or preventive tools to improve the control of the tuberculosis pandemic. To date, several in vitro models that are able to mimic human nascent granulomas have been reported. Here we describe a protocol in which Mtb-infected human peripheral blood mononuclear cells (PBMCs) are embedded within a collagen matrix leading to the formation of three-dimensional micro-granulomas. Subsequently, PBMCs and Mtb can be retrieved allowing multiparametric readouts from both the host and the ... [摘要]  [摘要]肉芽肿是有组织的多细胞结构,构成了人类病原体结核分枝杆菌(Mtb )感染的标志。对肉芽肿环境中复杂的宿主-Mtb相互作用的更好理解可能会导致新的治疗或预防工具,以改善对结核病大流行的控制。迄今为止,已经报道了几种能够模仿人类新生肉芽肿的体外模型。在这里我们描述一个协议,其中Mtb 被感染的人外周血单核细胞(PBMC)嵌入胶原蛋白基质中,导致形成三维微肉芽肿。随后,可以检索PBMC和Mtb,从而从宿主和病原体中读取多参数。除了并入生理性细胞外基质外,该模型还具有重现休眠样Mtb特征的独特优势,以及在免疫调节治疗下观察到的Mtb复苏的再生,其他已发表的体外实验方法尚未见报道。肉芽肿。

关键词:分枝杆菌,浴池erculosis,肉芽肿,主机,我ñ体外模型,休眠,复苏



[背景]结核病(TB)是一种空气传播的疾病,其包括由人类病原体肺和肺外感染结核分枝杆菌(Mtb的)。结核病在2019年估计造成150万人死亡(世卫组织,2019年),仍然是世界上最致命的传染病。结核病免疫发病机制的特点是形成了组织性的,称为肉芽肿的多细胞簇(Gengenbacher和Kaufmann,2012)。这些结构主要由被感染的和未感染的巨噬细胞的核心组成,周围是淋巴细胞边缘。肉芽肿内的敌对环境推动Mtb进入可能与疾病的潜在形式相关的缓慢或非复制性休眠状态。因此,Mtb休眠导致对针对分枝杆菌复制过程中活跃的代谢途径的抗生素的耐受性增加。 ...

Preparation of Sequencing RNA Libraries through Chemical Cross-linking Coupled to Affinity Purification (cCLAP) in Saccharomyces cerevisiae
Author:
Date:
2018-10-05
[Abstract]  Ribonucleoprotein particles (mRNPs) are complexes consisting of mRNAs and RNA-binding proteins (RBPs) which control mRNA transcription localization, turnover, and translation. Some mRNAs within the mRNPs have been shown to undergo degradation or storage. Those transcripts can lack general mRNA elements, like the poly(A) tail or 5’ cap structure, which prevent their identification through the application of widely-used approaches like oligo(dT) purification. Here, we describe a modified cross-linking affinity purification protocol (cCLAP) based on existing cross-linking and immunoprecipitation (CLIP) methods to isolate mRNAs which could be deadenylated, decapped and/or partially degraded in mRNPs, opening the possibility to detect different types of non-coding RNAs (ncRNAs). Once isolated, ... [摘要]  核糖核蛋白颗粒(mRNP)是由mRNA和RNA结合蛋白(RBP)组成的复合物,其控制mRNA转录定位,转换和翻译。已显示mRNP内的一些mRNA经历降解或储存。那些转录物可能缺乏一般的mRNA元件,如poly(A)尾或5'帽结构,这通过应用广泛使用的方法如oligo(dT)纯化来阻止它们的鉴定。在这里,我们描述了基于现有的交联和免疫沉淀(CLIP)方法的修饰的交联亲和纯化方案(cCLAP),以分离mRNP中可被去腺苷酸化,去除和/或部分降解的mRNA,从而开启了检测不同的可能性。非编码RNA(ncRNA)的类型。分离后,将RNA进行衔接子连接,然后进行下一代测序(NGS)。由于快速有效的交联和淬灭步骤,该方案也适用于瞬时诱导的mRNP颗粒。实例包括由外在应激物触发的处理体(PB)或应力颗粒(SG)。其重现性和广泛应用使该方案成为研究特定RNP的RNA组成的有用且有力的工具。
【背景】mRNP内转录物的表征对于理解细胞转录和转录后过程至关重要。通过交联和免疫沉淀,然后通过RNA-Seq从mRNP颗粒中分离RNA已经成为鉴定mRNA靶标的常用方法(Tagwerker et al。,2006; Hafner et al。,2010; Kishore et al。,2011)。 ...

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