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FisherbrandTM SureOneTM Aerosol Barrier Pipette Tips

Company: Fisher Scientific
Catalog#: 02-707-430
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Extraction of Small Molecules from Fecal Samples and Testing of Their Activity on Microbial Physiology
Author:
Date:
2018-04-20
[Abstract]  The human body is colonized by vast communities of microbes, collectively known as microbiota, or microbiome. Although microbes colonize every surface of our bodies that is exposed to the external environment, the biggest collection of microbes colonizing humans and other mammals can be found in the gastrointestinal tract. Given the fact that the human gut is colonized by several hundred microbial species, our group hypothesized that the chemical diversity of this environment should be significant, and that many of the molecules present in that environment would have important signaling roles. Therefore, we devised a protocol to extract these molecules from human feces and test their signaling properties. Potentially bioactive extracts can be tested through addition to culture medium and ... [摘要]  人体被巨大的微生物群体统称为微生物群体或微生物群体。尽管微生物在我们身体的每一个暴露于外部环境的表面上定殖,但人类和其他哺乳动物中最大量的微生物可以在胃肠道中找到。鉴于人类肠道已被数百种微生物物种繁殖,我们的团队假设这种环境的化学多样性应该是显着的,并且该环境中存在的许多分子将具有重要的信号传导作用。因此,我们制定了一个协议,从人类粪便中提取这些分子并测试其信号特性。可以通过添加培养基并分析细菌生长和基因表达以及其他性质来测试潜在的生物活性提取物。本文描述的方案提供了一种简便且快速的方法,用于使用肠道沙门氏菌作为模型生物体从粪便样品中提取和测试代谢物。该方案还可以适用于从其他基质如培养的哺乳动物细胞,组织,体液和无菌微生物培养物中提取小分子,并且可以针对各种微生物物种测试所得提取物。

【背景】复杂的微生物群落生活在人类和人类身上,将暴露于外部环境的每个表面都定殖。几十年来,这些社区已经获得了几个教派,其中包括正常的植物群,微生物群和最近的微生物群(Sekirov等人,2010年; ...

FACS-based Isolation of Neural and Glioma Stem Cell Populations from Fresh Human Tissues Utilizing EGF Ligand
Author:
Date:
2017-12-20
[Abstract]  Direct isolation of human neural and glioma stem cells from fresh tissues permits their biological study without prior culture and may capture novel aspects of their molecular phenotype in their native state. Recently, we demonstrated the ability to prospectively isolate stem cell populations from fresh human germinal matrix and glioblastoma samples, exploiting the ability of cells to bind the Epidermal Growth Factor (EGF) ligand in fluorescence-activated cell sorting (FACS). We demonstrated that FACS-isolated EGF-bound neural and glioblastoma populations encompass the sphere-forming colonies in vitro, and are capable of both self-renewal and multilineage differentiation. Here we describe in detail the purification methodology of EGF-bound (i.e., EGFR+) human neural and ... [摘要]  从新鲜组织中直接分离人类神经和胶质瘤干细胞允许其在没有事先培养的情况下进行生物学研究,并且可以在其天然状态中捕获其分子表型的新方面。最近,我们展示了前瞻性地从新鲜人类生发基质和胶质母细胞瘤样品中分离干细胞群的能力,利用细胞在荧光激活细胞分选(FACS)中结合表皮生长因子(EGF)配体的能力。我们证明FACS分离的EGF结合的神经和成胶质细胞瘤细胞群体在体外包含球体形成的集落,并且能够自我更新和多向分化。在此我们详细描述了具有来自新鲜死亡和手术组织的干细胞特性的EGF-结合(即EGFR +)人类神经和胶质瘤细胞的纯化方法。利用天然配体结合能力前瞻性分离干细胞群的能力为了解非培养条件下的正常和肿瘤细胞生物学打开了新的门,并且适用于在种群和单细胞分辨率下的各种下游分子测序研究。

【背景】由于缺乏通用的神经和神经胶质瘤干细胞标志物(Lathia et al。,2015)以及频繁依赖于培养的细胞,理解人神经和胶质瘤干细胞的内在生物学一直是一个挑战比那些直接从组织分离的。跨膜糖蛋白Prominin或CD133是分离神经(Uchida等,2000)和神经胶质瘤干细胞(GSC)(Singh等,2000)的最好描述和经常使用的干细胞标记物之一。等人,2003; Singh等人,2004; ...

Primary Culture System for Germ Cells from Caenorhabditis elegans Tumorous Germline Mutants
Author:
Date:
2017-08-05
[Abstract]  The Caenorhabditis elegans germ line is an important model system for the study of germ stem cells. Wild-type C. elegans germ cells are syncytial and therefore cannot be isolated in in vitro cultures. In contrast, the germ cells from tumorous mutants can be fully cellularized and isolated intact from the mutant animals. Here we describe a detailed protocol for the isolation of germ cells from tumorous mutants that allows the germ cells to be maintained for extended periods in an in vitro primary culture. This protocol has been adapted from Chaudhari et al., 2016. [摘要]  秀丽隐杆线虫种系是胚芽干细胞研究的重要模型系统。 野生型C。 线虫生殖细胞是合胞体,因此不能在体外培养中分离。 相比之下,来自肿瘤突变体的生殖细胞可以完全被细胞化并从突变动物中完整分离。 在这里,我们描述了从肿瘤突变体中分离生殖细胞的详细方案,其允许生殖细胞在体外原代培养中长时间维持。 该协议已从2016年Chaudhari等人改编。
【背景】秀丽生殖细胞在位于两个性腺臂的远端区域的两个成体干细胞龛中产生(Hansen和Schedl,2013; Kimble和Seidel,2013)。在野生型雌雄同体中,有丝分裂生殖细胞仅限于性腺臂的远端,干细胞生态位。野生型生殖细胞是合胞体,并且包含延伸通过性腺臂中心区域的共同细胞质的开口。 ℃。线虫肿瘤种系突变体在整个性腺中增加了生殖细胞的有丝分裂增殖。我们发现肿瘤种系突变体通常具有完整的细胞生殖细胞,其含有完整的质膜(Chaudhari等人,2016)。这种细胞化允许生殖细胞的分离及其在培养中的维持。该方案描述了分离和维持培养物中肿瘤突变体的生殖细胞的方法学和组织培养基。虽然已经描述了用于C的主要培养物的培养基。 elegans 胚胎和幼虫细胞(Strange等人,2007; Zhang和Kuhn,2013),生殖细胞在这种培养基中不能存活(Chaudhari等人。 ...

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