| CD 3254RXRα agonist,potent and selective |

Sample solution is provided at 25 µL, 10mM.
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Cell Stem Cell.2017 Nov 20. pii: S1934-5909(17)30375-2.Quality Control & MSDS
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- Purity = 98.00%
- COA (Certificate Of Analysis)
- MSDS (Material Safety Data Sheet)
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Chemical structure


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| Cas No. | 196961-43-0 | SDF | Download SDF |
| Chemical Name | (E)-3-(4-hydroxy-3-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydronaphthalen-2-yl)phenyl)acrylic acid | ||
| Canonical SMILES | OC1=CC=C(/C=C/C(O)=O)C=C1C2=C(C)C=C3C(C)(C)CCC(C)(C)C3=C2 | ||
| Formula | C24H28O3 | M.Wt | 364.48 |
| Solubility | Soluble in DMSO | Storage | Store at -20°C |
| Physical Appearance | A crystalline solid | Shipping Condition | Evaluation sample solution : ship with blue ice.All other available size:ship with RT , or blue ice upon request |
| General tips | For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months. | ||
CD3254 is a potent and selective agonist of Retinoid X receptors (RXRα).
Retinoid X receptors (RXRs) are nuclear receptors that act as ligand-dependent transcription factors and function as the homodimer or as heterodimers with other nuclear receptors, such as retinoic acid receptors (RARs), peroxisome proliferator-activated receptors (PPARs), or liver X receptors (LXRs). RXR plays essential roles in the regulation of glucose metabolism, lipid metabolism and immune response. Retinoid X receptors (RXRs) contains three family members including RARα, RARβ or RARγ receptors. RXRα belongs to the NR2B nuclear receptor family and primarily expressed in the liver, intestines, kidneys, and epidermis.
CD3254 and its’ analogue bexarotene have been reported as a treatment for cutaneous T-cell lymphoma (CTCL), despite the fact that treatment with CD3254 can evoke reactions by disturbing other RXR-heterodimer receptor pathways. Of the seven displayed novel exacerbates, all analogs animate RXR-controlled translation in mammalian 2 hybrid and RXRE-interceded tests, have equivalent or hoisted natural action in view of EC50 profiles, and hold comparative or enhanced apoptotic movement in CTCL assays contrasted with CD3254. Every single novel compound show selectivity for RXR and insignificant hybrid onto the retinoic corrosive receptor (RAR) contrasted with all-trans-retinoic corrosive, with select analogs likewise decreasing hindrance of other RXR-subordinate pathways (e.g., VDR-RXR) [1].
In vivo, CD3254 induced the phenotypes of malformations after 5 days exposure at low concentration (20 μg/l) to those after the 1st d exposure at high concentrations (50 and 100 μg/L) [2].
References:Modeling, synthesis, and biological evaluation of potential retinoid X receptor (RXR) selective agonists: novel analogues of 4-[1-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydro-2-naphthyl)ethynyl]benzoic acid (bexarotene) and (E)-3-(3-(1,2,3,4-tetrahydro-1,1,4,4,6-pentamethylnaphthalen-7-yl)-4-hydroxyphenyl)acrylic acid (CD3254). J Med Chem. 2013 Nov 14;56(21):8432-54. doi: 10.1021/jm4008517. Epub 2013 Nov 1.Divergent teratogenicity of agonists of retinoid X receptors in embryos of zebrafish (Danio rerio). Ecotoxicology. 2012 Jul;21(5):1465-75. doi: 10.1007/s10646-012-0900-9. Epub 2012 Apr 10.
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与小分子siRNAs相比,尽管两者在分子特性、生物起源等方面是相似的,但也存在不少的差异.siRNAs是由dsDNA在Dicer酶切割下产生,而成熟miRNAs的产生要复杂一些,首先pri-miRNA在核内由一种称为Drosha酶处理后成为大约70nt的带有茎环结构的Precursor miRNAs (pre-miRNAs)(Denli et al.,2004; Gregory et al.,2004; Han et al.,2004);这些pre-miRNAs在Exportin-5帮助下转运到细胞核外之后再由胞质Dicer酶进行处理,酶切后成为成熟的miRNAs(Lund et al.,2004; Yi et al.,2003).两者的作用机制上也存在差别,成熟的miRNAs则是通过与miRNP核蛋白体复合物结合,识别靶mRNA,并与之发生部分互补,从而阻遏靶mRNA的翻译.在动物中,成熟的单链miRNAs与蛋白质复合物miRNP结合,引导这种复合物通过部分互补结合到mRNA的3′UTR(非编码区域),从而阻遏翻译.而在siRNA通路中,单链的siRNA结合到RISC复合物中,引导复合物与mRNA完全互补,通过其自身的解旋酶活性,解开siRNAs,通过反义siRNA链识别目的mRNA片段,通过内切酶活性切割目的片段,接着再通过细胞外切酶进一步降解目的片段.除此之外,miRNA也可以切割完全互补的mRNA,而siRNA也可以阻遏3′UTR具有短片断互补的mRNA的翻译.
二:主要功能:①运输功能②在逆转录作用中作为合成互补链DNA链的引物。③在细菌细胞壁、叶绿素、脂多糖和氨酰磷脂酰甘油的合成中都与某些tRNA的参与有关。
PNA是一种人工合成的核酸的类似物,与核酸相似,它也是由携带ATGC四种碱基的四种单体首尾相连所构成的链状结构,从而保证这种物质能够像核酸一样靠碱基堆积力形成Watson-Crick碱基对,与DNA、RNA形成杂交分子PNA/DNA或PNA/RNA这就是PNA作为杂交探针的理论基础。所不同的是构成PNA骨架的单体不是通常的带负电的磷酸核糖而是N-(2-氨已基)-甘氨酸,单体之间靠酰胺键连接成长链。这种电中性的骨架结构赋予肽核酸探针优良的杂交特性。
首先PNA/DNA杂交分子的性质很稳定,从化学动力学角度看,PNA/DNA的结合常数有明显提高,一旦形成了双链,即使加入上百倍的寡核苷酸也不能使它解离。据报道,对于含有高度反向重复序列的超螺旋DNA,PNA/DNA杂交分子比DNA/DNA双链的结合常数提高了五万倍;从热力学角度看,PNA/DNA杂交分子的Tm也高于相同序列的DNA/DNA双链,通常,在100mmol/L的NaCl溶液中,PNA/DNA杂合子与相应的DNA/DNA双链相比,每个碱基对的Tm值要高出1℃。也就是说,15个碱基对的PNA/DNA平均Tm值约为70℃,比同样的DNA/DNA要高出15℃。从而使检测过程中的灵敏度大为提高。此外,中性骨架还使PNA与DNA的杂交摆脱了对杂交液盐度的依赖,这一重要性质不仅意味着杂交过程中省去了提高盐浓度的操作,更有意义的是,只要保证杂交体系足够低的离子强度,就能抑制非特异性的杂交和靶DNA序列的自身复性对灵敏度的损害。
不但如此,这种高度的灵敏度并没有像其他种类的探针一样引起特异性的下降,相反它对于碱基错配的容纳力更小。在16bp的PNA/DNA杂合子中,一个碱基的错配会导致Tm值下降15℃,而对于同样的DNA双链,Tm值只下降11℃
原文地址:http://tahepna.com/file_news_read.asp?id=59&class=%D1%D0%BE%BF%BD%F8%D5%B9&fo=4&flag=
编码线虫的氨基酰tRNA合成酶是否和编码大鼠的氨基酰tRNA合成酶的基因相同?
最近测序做了TRNAfragment,但是在验证测序结果上遇到了问题,TRF大小在30左右,按照mirna设计颈环引物跑PCR,结果测序为0的数据也能跑出来,后来师兄分析可能把成熟的TRNA也检测出来了,不知道有哪位大神可以指导下TRF的引物应该如何设计啊?
②成熟的tRNA分子中有许多的稀有碱基,因此tRNA在甲基转移酶催化下,某些嘌呤生成甲基嘌呤如A→mA,G→mA。有些尿嘧啶还原为双氢尿嘧啶。尿嘧啶核苷转变不假尿嘧啶核苷。某些腺苷酸脱氨基为成为次黄嘌呤核苷酸(Ⅰ)
③3’末端加上CCA:在核苷酸转移酶作用下,3’--末端除去个别碱基后,换上tRNA分子统一的CCA-OH末端,完成tRNA分子中的氨基酸臂结构。
n.[医] (对伤处等的) 针探,探查; [医] 探针,取样器; 探测仪;探头;
vt.探索,调查; 用探针(或探测器等)探查,探测;
vt.盘问; (用试探性袭击等)侦察(敌情) ; 用尖物刺穿(物件); 用力使向前推进;
The more they probed into his background, the more inflamed their suspicions would become
他们越调查他的背景,疑团就越多。
大家好,近期在用lipo2000做悬浮细胞HL-60的siRNA转染,siRNA是由公司合成的三个siRNA,但是敲除效率很低,并且每次qPCR后做出来的结果都不一样:有时是第一个siRNA敲除作用好点,但有时是第二个或第三个siRNA效果好。由于结果不稳,并且细胞不好转我就将细胞换成了A549,但是换成了贴壁细胞后发现每次转染后进行qPCR检测时结果还是不稳,另外,我还设置了不同siRNA的组合,有时结果显示siRNA1+siRNA3效果好,但有时显示siRNA1+2+3效果好。光做这个siRNA转染已经几个月了,到现在都没有确定具体哪个片段起作用或效果最好,也没有一个稳定的趋势。请问造成这种敲除效率不稳定的原因到底是为什么?急切等待回复,谢谢!
siRNA (Small interfering RNA),是一种小RNA分子(~21-25核苷酸),由Dicer(RNAase Ⅲ家族中对双链RNA具有特异性的酶)加工而成。SiRNA是siRISC的主要成员,激发与之互补的目标mRNA的沉默。

