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VWR® Culture Tubes, Plastic, with Dual-Position Caps

公司名称: VWR
产品编号: 60818-496
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Flow Cytometric Quantification of Fatty Acid Uptake by Mycobacterium tuberculosis in Macrophages
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2018-02-20
[Abstract]  Mycobacterium tuberculosis (Mtb) has evolved to assimilate fatty acids from its host. However, until recently, there was no reliable way to quantify fatty acid uptake by the bacteria during host cell infection. Here we describe a new method to quantify fatty acid uptake by intracellular bacilli. We infect macrophages with Mtb constitutively expressing mCherry and then metabolically label them with Bodipy-palmitate. Following the labeling procedure, we isolate Mtb-containing phagosomes on a sucrose cushion and disrupt the phagosomes with detergent. After extensive washes, the isolated ... [摘要]  结核分枝杆菌(Mtb)已经发展为从其宿主吸收脂肪酸。然而,直到最近,还没有可靠的方法来量化宿主细胞感染期间细菌对脂肪酸的摄取。在这里,我们描述了一种新的方法来量化细胞内杆菌对脂肪酸的摄取。我们用Mtb组成性表达mCherry感染巨噬细胞,然后用Bodipy-palmitate代谢标记它们。标记程序后,我们在蔗糖垫上分离含有Mtb的吞噬体,并用去污剂破坏吞噬体。大量洗涤后,通过流式细胞术分析分离的细菌以确定与细菌相关的Bodipy-棕榈酸酯信号的水平。使用液体培养物中脂肪酸摄取缺陷的Mtb突变株,我们确定该突变体在巨噬细胞感染期间同化比野生型菌株少10倍的Bodipy-棕榈酸酯。脂肪酸摄取的这种定量方法可用于进一步鉴定参与细胞内Mtb和可能的其他细菌的脂质摄取的途径。

【背景】结核分枝杆菌(Mtb)同化宿主来源的脂质(脂肪酸和胆固醇)的能力使得病原体能够在其宿主内存活(Russell等人,2010; Lovewell 等人,2016)。在小鼠感染期间和在人肺组织中,通过巨噬细胞内的Mtb上调胆固醇和脂肪酸代谢相关基因来支持该想法(Schnappinger等人,2003; Rachman等人,2006; Rohde等人,2007;Fontán等人,2008; Tailleux等人,2008; Homolka et al。,2010; Rohde et ...

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