| 货号 | 7148C |
| 描述 | CSTs PathScan® Phospho-HER2/ErbB2 (Tyr1221/1222) Sandwich ELISA Kit is a solid phase sandwich enzyme-linked immunosorbent assay (ELISA) that detects endogenous levels of phospho-HER2/ErbB2 (Tyr1221/1222) protein. A HER2/ErbB2 Mouse mAb #2170* has been coated onto the microwells. After incubation with cell lysates, both phospho- and nonphospho-HER2/Erb2 Receptor proteins are captured by the coated antibody. Following extensive washing, Phospho-HER2/ErbB2 (Tyr1221/1222) Antibody #2243* is added to detect the captured phospho-HER2/ErbB2 protein. Anti-rabbit IgG, HRP-linked Antibody #7074* is then used to recognize the bound detection antibody. HRP substrate, TMB, is added to develop color. The magnitude of optical density for this developed color is proportional to the quantity of phospho-HER2/ErbB2 (Tyr1221/1222) protein. * Antibodies in kit are custom formulations specific to kit. |
| 反应种属 | Human |
| 应用 | ELISA |
| 目标/特异性 | CSTs PathScan® Phospho-HER2/ErbB2 (Tyr1221/1222) Sandwich ELISA Kit detects endogenous levels of phospho-HER2/ErbB2 (Tyr1221/1222) protein. As shown in Figure 1, using PathScan® Phospho-HER2/ErbB2 (Tyr1221/1222) Sandwich ELISA Kit, a high level of phospho-HER2/ErbB2 (Tyr1221/1222) protein is detected in Calu-3 cells, and the levels are significantly reduced in Calu-3 cells treated with λ protein phosphastase. This kit detects proteins from the indicated species, as determined through in-house testing, but may also detect homologous proteins from other species. |
| 供应商 | CST |
| 背景 | The ErbB2 (HER2) proto-oncogene encodes a 185 kDa transmembrane, receptor-like glycoprotein with intrinsic tyrosine kinase activity (1). While ErbB2 lacks an identified ligand, ErbB2 kinase activity can be activated in the absence of a ligand when overexpressed and through heteromeric associations with other ErbB family members (2). Amplification of the ErbB2 gene and overexpression of its product are detected in almost 40% of human breast cancers (3). Binding of the c-Cbl ubiquitin ligase to ErbB2 at Tyr1112 leads to ErbB2 poly-ubiquitination and enhances degradation of this kinase (4). ErbB2 is a key therapeutic target in the treatment of breast cancer and other carcinomas and targeting the regulation of ErbB2 degradation by the c-Cbl-regulated proteolytic pathway is one potential therapeutic strategy. Phosphorylation of the kinase domain residue Tyr877 of ErbB2 (homologous to Tyr416 of pp60c-Src) may be involved in regulating ErbB2 biological activity. The major autophosphorylation sites in ErbB2 are Tyr1248 and Tyr1221/1222; phosphorylation of these sites couples ErbB2 to the Ras-Raf-MAP kinase signal transduction pathway (1,5). |
| 存放说明 | 4C |
| 参考文献 | Muthuswamy, S.K. et al. (1999) Mol Cell Biol 19, 6845-57. Qian, X. et al. (1994) Proc Natl Acad Sci USA 91, 1500-4. Dittadi, R. and Gion, M. (2000) J Natl Cancer Inst 92, 1443-4. Klapper, L.N. et al. (2000) Cancer Res 60, 3384-8. Kwon, Y.K. et al. (1997) J Neurosci 17, 8293-9. |
Figure1: Phosphorylation of HER2/ErbB2 at Tyr1221/1222 detected by PathScan® Phospho-HER2/ErbB2 (Tyr1221/1222) Sandwich ELISA kit #7148. HER2/ErbB2 receptor kinases in Calu-3 cells are known to be constitutively activated. Treatment of Calu-3 cell lysates with λ protein phosphatase (37ºC for 60 minutes) abolished the phosphorylation of HER2/ErbB2 in the lysates shown in both sandwich ELISA and Western analysis. OD 450 readings are shown in the top figure, while the corresponding Western blots, using Phospho-HER2/ErbB2 (Tyr1221/1222) Antibody #2243 (right panel) or HER2/ErbB2 Antibody #2242 (left panel), is shown in the bottom figure.图1：用PathScan® Phospho-HER2/ErbB2 (Tyr1221/1222) Sandwich ELISA kit #7148能够检测到HER2/ErbB2 上Tyr1221/1222位点的磷酸化。已知HER2/ErbB2 受体激酶在Calu-3细胞上组成型激活。Ｓandwich ELISA 和Western 检测显示用λ protein phosphatase (37ºC for 60 minutes)处理Calu-3 细胞后，其裂解液中HER2/ErbB2的磷酸化被破坏。上图显示OD450nm下的读值，下图显示用抗体Phospho-HER2/ErbB2 (Tyr1221/1222) Antibody #2243（右道）或抗体HER2/ErbB2 Antibody #2242（左道）进行免疫印迹检测的结果。 | |
Figure 2: The relationship between protein concentration of untreated and LPP-treated Calu-3 cell lysates (see the legend of Figure 1) and kit assay optical density readings.图2：Calu-3细胞经过和未经LPP刺激后其裂解液中蛋白含量和试剂盒检测读值之间的关系。（见图１注释） |
