
- Purity>97%, by SDS-PAGE under reducing conditions and visualized by silver stain
- Endotoxin Level<0.01 eu="" per="" 1="" μg="" of="" the="" protein="" by="" the="" lal="">0.01>
- ActivityMeasured in a cell proliferation assay using PHA-activated human peripheral blood lymphocytes (PBL). Yokota, T. et al. (1986) Proc. Natl. Acad. Sci. USA 83:5894. The ED50 for this effect is 0.15-0.3 ng/mL.
- SourceE. coli-derived Glu26-Ile154, with an N-terminal Met
- Accession #
- N-terminal Sequence
AnalysisGlu26 - Predicted Molecular Mass15 kDa
- Sasson, S.C. et al. (2006) Curr. Drug Targets 7:1571.
- Barata, J.T. et al. (2006) Exp. Hematol. 34:1133.
- Goodwin, R.G. et al. (1990) Proc. Natl. Acad. Sci. USA 86:302.
- Namen, A.E. et al. (1988) Nature 333:571.
- Shalapour, S. et al. (2012) PLoS ONE 7: e31939.
- Saini, M. et al. (2009) Blood 113:5793.
- Park, J.H. et al. (2004) Immunity 21:289.
- Vranjkovic, A. et al. (2007) Int. Immunol. 19:1329.
- Sudo, T. et al. (1993) Proc. Natl. Acad. Sci. 90:9125.
- Seddon, B. et al. (2003) Nat. Immunol. 4:680.
- Schluns, K.S. et al. (2000) Nat. Immunol. 5:426.
- Peschon, J.J. et al. (1994) J. Exp. Med. 180:1955.
- Pribyl, J.A. and T.W. LeBien (1996) Proc. Natl. Acad. Sci. 93:10348.
- Johnson, K. et al. (2012) J. Immunol. 188:6084.
- Nodland, S.E. et al. (2011) Blood 118:2116.
- Long Name:Interleukin 7
- Entrez Gene IDs:3574 (Human); 16196 (Mouse); 25647 (Rat)
- Alternate Names:IL7; IL-7; IL-7interleukin-7; interleukin 7; Lymphopoietin-1; PBGF
Background:
IL-7 (interleukin-7) is a 25 kDa cytokine of the hemopoietin family that plays important roles in lymphocyte differentiation, proliferation, and survival (1-4). Mouse IL-7 cDNA encodes 154 amino acids (aa) that include a 25 aa signal peptide (4). Mouse IL-7 shares approximately 88% aa sequence identity with rat IL-7 and 58-60% with human, equine, bovine, ovine, porcine, feline and canine IL-7. Human and mouse IL-7 exhibit cross-species activity (2, 3). IL-7 is produced by a wide variety of cells in primary and secondary lymphoid tissues, including stromal epithelial cells of the thymus, bone marrow, and intestines (1, 2, 5). Circulating IL-7 is limiting in healthy animals, but increases during lymphopenia (1, 6). IL-7 signals through a complex of the IL-7 Receptor alpha subunit (IL-7 R alpha, also known as CD127) with the commongammachain ( gamma c) (1). Thegamma c is also a subunit of the receptors for IL-2, -4, -9, -15, and -21 (1). IL-7 R alphais expressed on double negative (CD4-CD8-) and CD4+ or CD8+ single positive naïve and memory T cells, but undergoes IL-7-mediated down‑regulation and shedding during antigen-driven T cell proliferation, and is absent on regulatory T cells (1, 2, 6-11). IL-7 contributes to the maintenance of all naïve and memory T cells, mainly by promoting expression of the anti-apoptotic protein Bcl-2 (9-11). It is required for optimal T cell-dendritic cell interaction (6). IL-7 is expressed early in B cell development prior to the appearance of surface IgM (1, 5, 9). In mouse, IL-7 activation of IL-7 R alphais critical for both T cell and B cell lineage development, while in humans, it is required for T cell but not for B cell development (4, 9, 12, 13). However, IL-7 functions in both mouse and human pro-B cells to suppress premature Ig light chain recombination during proliferative growth (14, 15).
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2.加大辣根过氧化物酶标记的链霉亲和素;
我现在用商品化的试剂盒进行夹心法ELISA测定某抗体的浓度,盒子给定了4个标准品,标准品抗体浓度为70000~1000单位,测定步骤中要求对样品进行1:1000稀释后测定。
但是有的样本按照1:1000稀释后,最终OD值大于70000浓度的标准品的OD值,然后使用ELISACALC软件进行四参数拟合,超过了标准曲线的范围,就算不出来这个样品的浓度,但是如果在1000-70000之间的OD值就可以算出相应浓度。请教大神们,接下来我是否可以对样品进行1:2000,1:4000浓度稀释,算出结果后再×2、×4,算作此样品的浓度呢?还是直接给一个>70000的定性结果?或者可以有能算出来的其他软件?
Ps试剂盒中提及Dilutionlinearity(稀释线性?)为141%,这个是什么意思呢?
多谢!!
请大家帮帮忙,第一步加完抗原后必须封闭吗
目前,我用该蛋白的鼠源性单抗来包被ELISA板子,5%BSA37度封闭二小时后,洗涤四次后将板子分三个组加入抗原:其中一个组中加入的是我重组的蛋白,另一个组为用其它方法证实含该蛋白的人体内血清,最后一个组加入PBS。37度一小时后洗涤四次后每孔加入我制备的兔源性多抗。37度一小时洗涤六次后我再加入酶标记的抗兔的抗体37度40分钟后洗涤六次后TMB显色。
问题就在我显色后所有的孔都是阳性,其中以抗原为我的重组蛋白组与PBS组OD值最高,两组都可以达到1.8以上,而加入的抗原为人体血清组低,为0.6-1.0不等。
后面我优化条件,封闭液用过5%的脱脂奶粉,2%的BSA,包被的单抗浓度摸了梯度,加入的多抗也摸了梯度,酶标的抗体也摸了梯度。结果都没有改变,连趋势每次都是一样以重组蛋白组与PBS组OD最高。
今天我还试着把抗原换成其它蛋白也做出了强阳性?
请教各位高手,我的ELISA该如何往下面做了啊,是不是我的抗体本身有问题呢?
对了,我包被用的单抗是用GE公司的预装柱纯化的,很纯,在考染中是看不到一条杂带的。
ELISA双抗体夹心法(enzyme linked immunosorbent assay——sandwich technique)的原理是将特异性抗体结合到固相载体上形成固相抗体,然后和待检血清中的相应抗原结合形成免疫复合物,洗涤后再加酶标记抗体,与免疫复合物中抗原结合形成酶标抗体-抗原-固相抗体复合物,加底物显色,判断抗原含量。
生物帮有相关介绍。编码RNA http://doc.bio1000.com/show-3399.html
(2)封闭:将已包被的板用洗涤液洗涤2次,每孔加入120 μL封闭液,封闭一段时间,取出,甩干备用。
(3)竞争反应:在制备好的板中每孔加入50 μL系列浓度的标准品溶液和50 μL稀释好的酶标抗体溶液,孵育一段时间。
(4)洗板:用洗涤液洗涤5次。
(5)显色反应:每孔加入显色溶液100 μL,孵育一段时间。
(6)终止:每孔各加入终止液,在酶标仪上测定各孔的吸光值。


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