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Glacial acetic acid

Glacial acetic acid

Company: Sigma-Aldrich
Catalog#: 1005706
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Using Stable Isotopes in Bone Marrow Derived Macrophage to Analyze Metabolism
Author:
Date:
2018-09-05
[Abstract]  Using gas chromatography mass spectrometry (GC-MS) to analyze the citric acid cycle (CAC) and related intermediates (such as glutamate, glutamine, GABA, and aspartate) is an analytical approach to identify unexpected correlations between apparently related and unrelated pathways of energy metabolism. Intermediates can be as expressed as their absolute concentrations or relative ratios by using known amounts of added reference standards to the sample. GC-MS can also distinguish between heavy labeled molecules (2H- or 13C-labeled) and the naturally occurring most abundant molecules. Applications using tracers can also assess the turnover of specific metabolic pools under various physiological and pathological conditions as well as for pathway discovery.

The ...
[摘要]  使用气相色谱质谱(GC-MS)分析柠檬酸循环(CAC)和相关中间体(如谷氨酸,谷氨酰胺,GABA和天冬氨酸)是一种分析方法,用于识别明显相关和不相关的能量途径之间的意外相关性代谢。通过使用已知量的样品添加的参考标准,中间体可以表示为它们的绝对浓度或相对比例。 GC-MS还可以区分重标记分子( 2 H-或 13 C-标记的)和天然存在的最丰富的分子。使用示踪剂的应用还可以评估在各种生理和病理条件下以及用于途径发现的特定代谢池的周转。

以下方案是一种相对简单的方法,不仅对小浓度的代谢中间体敏感,而且还可以 in vivo 或 in vitro 用于确定各种新陈代谢的完整性途径,如特定代谢物池内的通量变化。我们使用该协议来确定磷酸烯醇丙酮酸羧激酶1 ( Pck1 )基因在小鼠巨噬细胞中的作用,以确定 13 C将葡萄糖标记为特定的CAC代谢物库

【背景】随着细胞和小鼠中基因表达改变的发展,需要了解这些缺失或过表达的基因如何影响代谢途径的调节。在该方案中,我们使用稳定同位素来确定进入CAC的葡萄糖通量如何改变葡萄糖对柠檬酸盐,琥珀酸盐和苹果酸盐的贡献。使用稳定同位素和目标分析代谢只是在细胞培养中使用稳定同位素的一个好处。

本方案中描述的用于细胞内代谢物功能定量的方法是通过在U- 13 ...

Protocols to Study Declarative Memory Formation in Mice and Humans: Optogenetics and Translational Behavioral Approaches
Author:
Date:
2018-06-20
[Abstract]  Declarative memory formation depends on the hippocampus and declines in aging. Two functions of the hippocampus, temporal binding and relational organization (Rawlins and Tsaltas, 1983; Eichenbaum et al., 1992; Cohen et al., 1997), are known to decline in aging (Leal and Yassa, 2015). However, in the literature distinct procedures have been used to study these two functions. Here, we describe the experimental procedures used to investigate how these two processes are related in the formation of declarative memory and how they are compromised in aging (Sellami et al., 2017). First, we studied temporal binding using a one-trial learning procedure: trace fear conditioning. It is classical Pavlovian conditioning requiring temporal binding since a brief temporal gap ... [摘要]  陈述性记忆的形成取决于海马体和老化程度的下降。已知海马,时间结合和关系组织的两种功能(Rawlins和Tsaltas,1983; Eichenbaum等人,1992; Cohen等人,1997),已知老龄化下降(Leal和Yassa,2015)。但是,在文献中已经使用不同的程序来研究这两个功能。在这里,我们描述了用于研究这两个过程如何与陈述性记忆的形成以及它们如何在衰老中受到损害有关的实验程序(Sellami et。,2017)。首先,我们使用单一试验性学习程序研究了时间绑定:追踪恐惧条件反射。这是经典的巴甫洛夫条件需要时间约束,因为短暂的时间间隔将条件刺激(CS)和无条件刺激(US)呈现分开。我们将追踪恐惧条件程序与光遗传学方法相结合,并且我们表明时间依赖性依赖于背侧(d)CA1活性在时间间隙上的依赖性。然后,我们研究了时间绑定和关系组织之间在声明性记忆形成中的相互作用,这种相互作用使用了小鼠中的两阶段径向迷宫任务及其在人类中的虚拟类比。行为过程包括一个初始学习阶段,在这个阶段中,受试者获得每个手臂持续的奖励/无奖赏价值,然后是测试阶段,其中武器中的奖励突发事件保持不变,但武器重新组合以评估灵活性,陈述性记忆。我们证明了dCA1依赖的时间结合对于记忆的关系组织的发展是必需的,这允许灵活的陈述记忆表达。此外,在衰老过程中,陈述性记忆的退化是由于时间约束能力的减少而阻碍了关系组织。 ...

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