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Invitrogen™

Human Silencer Select siRNA INV IN PLATES

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货号 4427030
价格(CNY)
-
Human Silencer Select siRNA INV IN PLATES
规格
Unit Size0.1 nmol

常见问题解答 (FAQ)

使用载体介导的RNAi技术有什么优势?

载体介导的技术使您能够:

•实现瞬时或稳定的靶点敲低
•在所有细胞类型中实现RNAi,甚至是难转染、原代和不分裂细胞
•通过siRNA的诱导表达,调控基因抑制效应
•可以筛选稳定表达某个siRNA序列的单一细胞群
•利用组织特异性启动子控制体内基因表达

我的细胞为何在转染后快要死了?

我们建议进行一个转染试剂对照实验,确定您的细胞是否对转染试剂敏感。此外,您可以尝试其他细胞密度和siRNA浓度以减少转染本身的毒性。

我转染了siRNA并且mRNA水平降低了,但是蛋白水平没有降低,这是什么原因所致?

在一些情况下,即使mRNA已经被敲低,蛋白的敲低效果也会受蛋白降解速率等其他变量的影响。另外,相比于mRNA,蛋白可能需要更长的时间才能看到敲低效果。

我的目的基因没有被敲低,可能的原因有哪些?

请参考以下可能的原因和建议:

•您测试了多少个siRNA?有任何敲低效果吗?如果所有siRNA都没有敲低效果(<10%),那么可能是检测方法本身的问题。试试使用其他qRT-PCR assay评估敲低效果。
•qRT-PCRassay的靶位点和siRNA切割位点的相对位置如何?如果两者相差3,000碱基以上,问题可能是其它剪接转录本的存在造成的。
•实验的Ct值是多少?在40循环的qRT-PCR实验中它们应该低于35。
•您确定siRNA转染进入细胞中了吗?我们建议使用一个经过验证的阳性对照siRNA来检查转染效率。

我的siRNA没有获得任何基因敲低效果,对此您有何建议?

请参考以下可能的原因和建议:

•是检测的mRNA水平吗?最可靠的方法是实时PCR。在一些情况下,即使mRNA已经被敲低,蛋白的敲低效果也可能会受蛋白降解速率等其它变量的影响。
•RNA是如何提取的?检测提取的RNA的质量了吗?应确保RNA没有降解。
•使用阳性对照了吗?这可以帮助确定试剂是否有效以及siRNA是否被正确递送进细胞。请在进行实验的同时使用阳性对照siRNA。
•使用转染对照了吗?被转染细胞的百分比是多少?
•进行不同时间的检测了吗?通常,基因沉默可以早在转染后24小时测定。但是,基因敲低的持续时间和程度取决于所用的细胞类型和siRNA的浓度。
•优化过转染条件吗?您可以尝试使用不同的细胞密度和siRNA浓度。
•您使用了多大浓度的siRNA?我们建议测试 5 nM到100 nM之间的多个浓度。

引用和文献 (133)

引用和文献
Abstract
Expression of CYP4A1 in U251 human glioma cell induces hyperproliferative phenotype in vitro and rapidly growing tumors in vivo.
Authors:Guo AM, Sheng J, Scicli GM, Arbab AS, Lehman NL, Edwards PA, Falck JR, Roman RJ, Scicli AG
Journal:J Pharmacol Exp Ther
PubMed ID:18591218
Exogenous 20-hydroxyeicosatetraenoic acid (20-HETE) increases the growth of human glioma cells in vitro. However, glioma cells in culture show negligible 20-HETE synthesis. We examined whether inducing the expression of a 20-HETE synthase in a human glioma U251 cell line would increase proliferation. U251 cells transfected with CYP4A1 cDNA (termed ... More
S100A16, a novel calcium-binding protein of the EF-hand superfamily.
Authors:Sturchler E, Cox JA, Durussel I, Weibel M, Heizmann CW
Journal:J Biol Chem
PubMed ID:17030513
S100A16 protein is a new and unique member of the EF-hand Ca(2+)-binding proteins. S100 proteins are cell- and tissue-specific and are involved in many intra- and extracellular processes through interacting with specific target proteins. In the central nervous system S100 proteins are implicated in cell proliferation, differentiation, migration, and apoptosis ... More
alpha(v)beta(3) Integrin-mediated drug resistance in human laryngeal carcinoma cells is caused by glutathione-dependent elimination of drug-induced reactive oxidative species.
Authors:Brozovic A, Majhen D, Roje V, Mikac N, Jakopec S, Fritz G, Osmak M, Ambriovic-Ristov A
Journal:Mol Pharmacol
PubMed ID:18441044
As a model for determination of the role of integrins in drug resistance, we used alpha(v)beta(3) integrin-negative human laryngeal carcinoma cell line (HEp2) and three HEp2-derived cell clones with a gradual increase of alpha(v)beta(3) integrin expression. The alpha(v)beta(3) integrin expression protects cells from cisplatin, mitomycin C, and doxorubicin. ... More
Transforming growth factor-beta-stimulated endocardial cell transformation is dependent on Par6c regulation of RhoA.
Authors:Townsend TA, Wrana JL, Davis GE, Barnett JV
Journal:J Biol Chem
PubMed ID:18343818
Valvular heart disease due to congenital abnormalities or pathology is a major cause of mortality and morbidity. Understanding the cellular processes and molecules that regulate valve formation and remodeling is required to develop effective therapies. In the developing heart, epithelial-mesenchymal transformation (EMT) in a subpopulation of endocardial cells in the ... More
IL-10 inhibits cysteinyl leukotriene-induced activation of human monocytes and monocyte-derived dendritic cells.
Authors:Woszczek G, Chen LY, Nagineni S, Shelhamer JH
Journal:J Immunol
PubMed ID:18490762
The immunoregulatory cytokine IL-10 plays an essential role in down-modulating adaptive and innate immune responses leading to chronic inflammatory diseases. In contrast, cysteinyl leukotrienes (cysLTs), important proinflammatory mediators of cell trafficking and innate immune responses, are thought to enhance immune reactions in the pathogenesis of diseases, such as bronchial asthma, ... More