
Source | M.W. | CAS No. | |||
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Structural Info | |||||
Formulation | Lyophilized in sterile filtered solution of PBS. | ||||
Reconstitution | Before reconstitution, a brief spin is recommended todrive down any material dislodged from the bottom of the tube. The lyophilized protein should bereconstituted in sterile H2O to a desired concentration. | ||||
Stability | The lyophilized protein is stable for at least oneyear if stored at -80 °C. Reconstituted protein is stable for at least four weeks at 4 °C,but should be stored in aliquots at -80 °C for longer term. Avoidrepeated freeze and thaw. | ||||
Purity | Greater than 90% as determined by SDS-PAGE analysis | ||||
Biological Activity | The activity was determined by using a TCF reporter gene assay in cultured human cells.The EC50 ranges from 5 - 20 ng/ml in the presence of 10 ng/mL human WNT-3a. | ||||
Country of Origin | USA |
R-spondin-1 is a natural enhancer of the canonicalWNT pathway. When used together with WNT proteins that activate thebeta-catenin pathway, R-spondin-1 enhances the activity of canonical WNTproteins by binding to LGR5 and LGR4 (refs.)Injection of recombinant RSpondin-1 intomouse causes activation of the βcatenin pathway and proliferation of intestinal crypt cells, which forms the basis for aclinical trial in amelioration of chemotherapy-induced colitis.Thisproduct is the full-length R-Spondin-1 fused at its C-terminus to the Fc domainof human IgG1. This fusion increases thestability of the protein in vitro and in vivo without compromising itsbiological activity. StemRD’s R-Spondin-1 Fc fusion protein isproduced in human 293 cells as a secreted protein and purified by protein Achromatography.Refs: de Lau, et al, LGR5 homologuesassociate with Wnt receptors and mediate R-spondin signaling. Nature. 2011 July 4; 476: 293; Carmon, et al, R-spondins function as ligandsfor the orphan receptors LGR4 and LGR5 to regulate Wnt/beta-catenin signaling.PNAS. 2011 Jul 12; 108: 11452.
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谢谢谢
按照药品管理的用于血源筛查的体外诊断试剂和采用放射性核素标记的体外诊断试剂,不属于本办法管理范围。
第十七条 根据产品风险程度由低到高,体外诊断试剂分为第一类、第二类、第三类产品。
(一)第一类产品
1.微生物培养基(不用于微生物鉴别和药敏试验);
2.样本处理用产品,如溶血剂、稀释液、染色液等。
(二)第二类产品
除已明确为第一类、第三类的产品,其他为第二类产品,主要包括:
1.用于蛋白质检测的试剂;
2.用于糖类检测的试剂;
3.用于激素检测的试剂;
4.用于酶类检测的试剂;
5.用于酯类检测的试剂;
6.用于维生素检测的试剂;
7.用于无机离子检测的试剂;
8.用于药物及药物代谢物检测的试剂;
9.用于自身抗体检测的试剂;
10.用于微生物鉴别或者药敏试验的试剂;
11.用于其他生理、生化或者免疫功能指标检测的试剂。
(三)第三类产品
1.与致病性病原体抗原、抗体以及核酸等检测相关的试剂;
2.与血型、组织配型相关的试剂;
3.与人类基因检测相关的试剂;
4.与遗传性疾病相关的试剂;
5.与麻醉药品、精神药品、医疗用毒性药品检测相关的试剂;
6.与治疗药物作用靶点检测相关的试剂;
7.与肿瘤标志物检测相关的试剂;
8.与变态反应(过敏原)相关的试剂。
不知道发在这里合适不,实在是求助无门啊!版主手下留情。
第一,血清成分复杂,最好用密理博的Montage Albumin Deplete Kit去除血清里50%的白蛋白
第二,磷酸化蛋白提取蛋白的时候,最好加入原钒酸钠,和磷酸酶抑制剂,防止蛋白脱磷酸化。
第三,不要用牛奶做封闭剂,用BSA。因为牛奶中含有磷酸化酪蛋白,防止非特异带。
第四,如果条带杂带多,而且,条带弱,可以选择millipore的signal boost,增加条带特异性,而且,增强条带的亮度。
加入荧光标记探针,巧妙地把核算扩增、杂交、光谱分析和实时检测技术结合在一起,借助于荧光信号来检测PCR产物。一方面提高了灵敏度,另一方面还可以做到PCR每循环一次就收集一个数据,建立实时扩增曲线,准确地确定CT值,从而根据CT值确定起始DNA的拷贝数,做到真正意义上的DNA定量。另外由于CT值是一个完全客观的参数,CT值越小,模版DNA的起始拷贝数越小。因此,利用CT值确定DNA拷贝数实时PCR方法比普通终点定量方法更加准确

