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Proteinase K

蛋白酶K

Company: Roche Diagnostics
Catalog#: 03115879001
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Hyaluronan Isolation from Mouse Mammary Gland
Author:
Date:
2018-06-05
[Abstract]  The glycosaminoglycan hyaluronan (HA) is a key component of the extracellular matrix. The molecular weight of HA is heterogeneous and can reach from several million to several hundred daltons. The effect of HA on cell behavior is size dependent; fragmented HA acts as a danger signal, stimulates cell migration and proliferation and is proinflammatory, native high molecular weight HA suppresses inflammation. Therefore, it is important to analyze HA size distribution when studying the role of HA in tissue homeostasis and pathology. This protocol describes isolation of HA from mouse mammary glands but can also be applied to other tissues. The quality of the isolated HA is sufficient to analyze size distribution by gel electrophoresis (Calabro et al., 2000). [摘要]  糖胺聚糖透明质酸(HA)是细胞外基质的关键组分。 HA的分子量是不均匀的,可以达到几百万至几百道尔顿。 HA对细胞行为的影响与尺寸有关; 片段化的HA作为危险信号起作用,刺激细胞迁移和增殖并且是促炎性的,原生高分子量HA抑制炎症。 因此,在研究HA在组织稳态和病理学中的作用时,分析HA的大小分布非常重要。 该协议描述从小鼠乳腺分离HA,但也可以应用于其他组织。 分离的HA的质量足以通过凝胶电泳分析大小分布(Calabro等人,2000)。

【背景】糖胺聚糖HA由N-乙酰葡糖胺和β葡萄糖醛酸二糖组成,并且是细胞外基质的普遍存在的组分。 高分子量HA通过酶促降解和被活性氧和氮物质氧化而碎裂。 在健康组织中,大部分HA具有高分子量。 片段化HA的积累在病理过程中起着危险信号的作用(Tolg等人,2012和2017; Yuan等人,2015)。 例如,HA片段刺激炎症,而高分子量HA抑制炎症。 HA通过与细胞膜受体相互作用影响细胞行为,如细胞迁移和增殖,导致信号通路的激活。 由于受体-HA相互作用受HA大小的影响,HA对组织生物学的影响不仅取决于HA量,而且取决于各个细胞的HA大小分布和HA受体表达。

Estradiol Receptor (ER) Chromatin Immunoprecipitation in MCF-7 Cells
Author:
Date:
2013-07-20
[Abstract]  Steroid hormone receptors, for example estradiol receptor, act like transcription factors. In the cell, steroids bind to a specific receptor. Upon ligand binding, many steroid receptors dimerize and enter nuclei where they bind specific DNA sequences called Hormone Responsive Elements (HRE) and regulate gene transcription. ER is able to bind DNA sites that are not Estrogen Responsive Elements (ERE) so regulating also the transcription of genes that are not classically controlled by estrogens. [摘要]  类固醇激素受体,例如雌二醇受体,像转录因子一样起作用。 在细胞中,类固醇与特异性受体结合。 在配体结合时,许多类固醇受体二聚化并进入细胞核,其中它们结合称为激素应答元件(HRE)的特异性DNA序列并调节基因转录。 ER能够结合不是雌激素反应元件(ERE)的DNA位点,从而也调节不经典地由雌激素控制的基因的转录。

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