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40 mL Tisssue Grinder, Dounce

Company: WHEATON
Catalog#: 357546
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Microvesicle Isolation from Rat Brain Extract Treated Human Mesenchymal Stem Cells
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Date:
2017-07-05
[Abstract]  Microvesicle (MVs) are submicron-sized membranous vesicles that are either actively released from cells via secretory compartments or shed from cell surface membranes. MVs are generated by many cell types and serve as vehicles that transfer biological information (e.g., protein, mRNA, and miRNA) to distant cells, thereby affecting their gene expression, proliferation, differentiation, and function. Although their physiological functions are not clearly defined, recent studies have shown their therapeutic potential for tissue repair and regeneration. While MVs can be isolated readily from mesenchymal stem cells (MSCs) and other cell types from various sources, the yield of MVs under conventional culture condition in vitro is one of the limiting factors for both the in ... [摘要]  微囊泡(MV)是亚微米尺寸的膜泡囊,其通过分泌室从细胞中积极释放或从细胞表面膜脱落。 MV由许多细胞类型产生并且用作将生物信息(例如,蛋白质,mRNA和miRNA)转移到远端细胞的载体,从而影响其基因表达,增殖,分化和功能。 虽然他们的生理功能没有明确定义,但最近的研究已经显示出其组织修复和再生的治疗潜力。 虽然MV可以从间充质干细胞(MSC)和来自各种来源的其他细胞类型容易地分离,但在体外常规培养条件下MV的产量是限制因素之一, 功能研究以及体外分析分析。 在这里,我们提供了一个通过大鼠脑提取物预处理MSC增加微泡产量的方案。
【背景】通过直接重编程或利用间充质干细胞进行细胞替代治疗来产生神经干细胞或神经细胞是神经变性疾病的潜在选择(Adib等人,2015)。最近的研究已经证明,来自MSC的微泡代表了增强组织再生,例如神经元再生,免疫调节,脑损伤中的血管发生的其他细胞替代方法的新颖且安全的替代方案(Kim等人,2013) ; Porro等,,2015; Lee等人,2016)。对受损组织外源信号如何影响微泡数量和组成的了解甚少。 MSCs的功能分泌物的含量和数量可以根据微环境的显着变化(Qu等人,2007)。例如,已知缺血性脑提取物或缺氧诱导合成有益于组织再生过程的许多细胞因子和生长因子(Chen等,2007; Shin et ...

Measuring Cyanobacterial Metabolism in Biofilms with NanoSIMS Isotope Imaging and Scanning Electron Microscopy (SEM)
Author:
Date:
2017-05-05
[Abstract]  To advance the understanding of microbial interactions, it is becoming increasingly important to resolve the individual metabolic contributions of microorganisms in complex communities. Organisms from biofilms can be especially difficult to separate, image and analyze, and methods to address these limitations are needed. High resolution imaging secondary ion mass spectrometry (NanoSIMS) generates single cell isotopic composition measurements, and can be used to quantify incorporation and exchange of an isotopically labeled substrate among individual organisms. Here, incorporation of cyanobacterial extracellular organic matter (EOM) by members of a cyanobacterial mixed species biofilm is used as a model to illustrate this method. Incorporation of stable isotope labeled (15N and 13 ... [摘要]  为了提高对微生物相互作用的理解,解决复杂群落中微生物代谢贡献的重要性越来越重要。生物膜的生物体特别难以分离,形成和分析,需要解决这些局限性的方法。高分辨率成像二次离子质谱(NanoSIMS)产生单细胞同位素组成测量,可用于量化在各生物体内同位素标记的底物的掺入和交换。在这里,使用由蓝藻混合物种生物膜的成员掺入的蓝细菌胞外有机物(EOM)作为模型来说明该方法。通过两组(蓝细菌和相关的异养微生物)掺入稳定同位素( 15 N和 13 C)EOM的量化。描述了用于定量生物膜中稳定同位素标记的EOM摄取的样品的生成,制备和分析方法。

背景 与NanoSIMS(“NanoSIP”)结合的稳定同位素标记是一种确定的稳定同位素标记底物掺入到单个微生物细胞中的方法,然后可将其推断以估计细胞群体的掺入(例如,Lechene et al。 ,2006和Woebken等人,2012)。可以将多个稳定同位素标记(例如, 13 C和 15 ...

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