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SpectraMax 190 Microplate Reader

酶标仪

Company: Molecular Devices
Catalog#: SpectraMax 190
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Easy and Efficient Permeabilization of Cyanobacteria for in vivo Enzyme Assays Using B-PER
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Date:
2018-01-05
[Abstract]  Cyanobacteria are photosynthetic bacteria that thrive in diverse ecosystems and play major roles in the global carbon cycle. The abilities of cyanobacteria to fix atmospheric CO2 and to allocate the fixed carbons to chemicals and biofuels have attracted growing attentions as sustainable microbial cell factories. A better understanding of activities of enzymes involved in the central carbon metabolism might lead to increased product yields. Currently, cell-free lysates are widely used for the determination of intracellular enzyme activities. However, due to thick cell walls in cyanobacteria, lysis of cyanobacterial cells is inefficient and often laborious. The present protocol describes an easy and efficient method to permeabilize cyanobacterial cells, without lysing them, and ... [摘要]  蓝细菌是光合细菌,在不同的生态系统中繁衍,在全球碳循环中发挥重要作用。 蓝藻固定大气CO 2和将固定碳分配到化学品和生物燃料的能力作为可持续的微生物细胞工厂已经引起越来越多的关注。 更好地了解参与中央碳代谢的酶的活性可能导致产物产量增加。 目前,无细胞裂解物被广泛用于细胞内酶活性的测定。 然而,由于蓝细菌细胞壁较厚,蓝细菌细胞的裂解效率低下且费力。 目前的方案描述了一种简单而有效的方法来渗透蓝藻细胞,而不溶解它们,并直接使用透化细胞来测定体内代谢酶活性。

【背景】我们之前已经报道了使用B-PER TM试剂(Thermo Fisher Science)(Rasmussen等人,2016)简单,有效且可扩展的蓝细菌的透化。 B-PER TM TM试剂含有溶解在Tris-HCl缓冲液中的未公开的温和洗涤剂,通常用于裂解细菌细胞如大肠杆菌(Escherichia coli)。偶然地,我们发现B-PER TM TM试剂渗透蓝细菌细胞而不是溶解它们,可能是因为厚的蓝细菌细胞壁(Hoiczyk和Hansel,2000)赋予了试剂中使用的去污剂的抗性。在生物技术感兴趣的蓝细菌中进行通透化。聚球蓝细菌PCC 7002(以下简称“Synechococcus”7002)和“Synechocystis”sp。 PCC ...

Efficient Production of Functional Human NKT Cells from Induced Pluripotent Stem Cells − Reprogramming of Human Vα24+iNKT Cells
Author:
Date:
2017-05-20
[Abstract]  Antigen-specific T cell-derived induced pluripotent stem cells (iPSCs) have been shown to re-differentiate into functional T cells and thus provide a potential source of T cells that could be useful for cancer immunotherapy. Human Vα24+ invariant natural killer T (Vα24+iNKT) cells are subset of T cells that are characterized by the expression of an invariant Vα24-Jα18 paired with Vβ11, that recognize glycolipids, such as α-galactosylceramide (α-GalCer), presented by the MHC class I-like molecule CD1d. Vα24+iNKT cells capable of producing IFN-γ are reported to augment anti-tumor responses, which affects both NK cells and CD8+ cytotoxic T lymphocytes to eliminate MHC- and MHC+ tumor cells, respectively. Here we describe a ... [摘要]  抗原特异性T细胞来源的诱导多能干细胞(iPSCs)已显示重新分化为功能性T细胞,从而提供可用于癌症免疫治疗的T细胞的潜在来源。不变性自然杀伤T(Vα24 + iNKT)细胞的人Vα24 + 细胞是T细胞的子集,其特征在于与Vβ11配对的不变Vα24-Jα18的表达,其识别糖脂,如α-半乳糖神经酰胺(α-GalCer),由MHC I类分子CD1d呈递。据报道能够产生IFN-γ的Vα24 + i / KT细胞增加抗肿瘤反应,其影响NK细胞和CD8 +细胞毒性T淋巴细胞以消除MHC - 和MHC + 肿瘤细胞。在这里,我们描述了将人Vα24 + iNKT细胞重编程到iPSC中的鲁棒方案,然后将其重新分化为Vα24 + iNKT细胞(iPS-Vα24功能的iNKT)。我们进一步提供了测定iPS-Vα24 + iNKT细胞活性的方案。背景 以前有报道说,针对晚期非小细胞肺癌(NSCLC)和头颈部癌症的Vα24 + iNKT细胞癌免疫治疗的临床试验显示疗效,耐受性良好(Motohashi et al。等人,2009; Yamasaki等人,2011)。然而,已知来自外周血单核细胞(PBMC)的Vα24 ...

In vitro Assay to Assess Efficacy of Potential Antiviral Compounds against Enterovirus D68
Author:
Date:
2017-03-20
[Abstract]  In 2014 enterovirus D68 (EV-D68) caused the largest outbreak in the United States since the discovery of the virus. Distinct from before, the 2014 infections were associated with more severe respiratory disease and occasional neurological complications. So far, there are no available vaccines or antivirals for the prophylaxis or treatment of EV-D68 infections. In order to evaluate the antiviral activity of potential inhibitors of EV-D68 replication, a cell-based cytopathic effect (CPE) reduction assay was developed (Sun et al., 2015). [摘要]  2014年肠病毒D68(EV-D68)自发现病毒以来,在美国引起了最大的爆发。与之前不同的是,2014年感染与更严重的呼吸道疾病和偶尔的神经系统并发症有关。到目前为止,还没有可用的疫苗或抗病毒药物用于预防或治疗EV-D68感染。为了评估EV-D68复制潜在抑制剂的抗病毒活性,开发了基于细胞的细胞病变效应(CPE)降低测定法(Sun等,2015)。

背景 作为新出现的病原体,以前很少报道靶向EV-D68的抗病毒化合物。迫切需要建立和开发抗病毒方法来对抗潜在的EV-D68流行病。在这里,我们报告一个详细的方案,可用于识别选择性抗EV-D68化合物。为了筛选和鉴定潜在的抗病毒化合物,基于MTS的CPE降解测定法是可重复使用的,易于使用和省时的方法,被广泛使用。该方法依赖于化合物抑制EV-D68诱导的CPE降低的能力。当化合物主动抑制EV-D68的复制时,病毒诱导的CPE将被减少或不存在。因此,代谢活性细胞能够将黄色四唑盐底物(MTS / PMS)转化为棕色甲an制品。当化合物不具有抗病毒作用时,宿主细胞死于病毒诱导的CPE,其将缺乏代谢活性,并且黄色底物保持未代谢。比色转化是定量的,因为可以从该测定产生的数据计算EC 50。

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