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细胞角蛋白20重组兔单抗
包装与价格:
产品名称 CK20 Recombinant Rabbit mAb 产品介绍
细胞角蛋白20重组兔单抗 商品属性
中文名称细胞角蛋白20重组兔单抗 别 名Cytokeratin 20; CK 20; Cytokeratin20; K20; Keratin 20; Keratin type I cytoskeletal 20; Keratin20; KRT 20; KRT 21; KRT20; KRT21; MGC35423; Protein IT; K1C20_HUMAN. 抗体来源Rabbit 克隆类型Recombinant 克 隆 号1F10 交叉反应Human,Rat 产品应用WB=1:1000-5000,IHC-P=1:200-1000,IHC-F=1:200-1000,IF=1:200-1000,Flow-Cyt=1ug/Test,ICC/IF=1:100-500 not yet tested in other applications. optimal dilutions/concentrations should be determined by the end user. 理论分子量48 kDa 检测分子量 细胞定位细胞浆 性 状Liquid 浓 度1mg/ml 免 疫 原A synthesized peptide derived from human Cytokeratin 20: 400-424 亚 型IgG 纯化方法affinity purified by Protein A 缓 冲 液0.01M TBS (pH7.4) with 1% BSA, 0.02% Proclin300 and 50% Glycerol. 保存条件Shipped at 4℃. Store at -20℃ for one year. Avoid repeated freeze/thaw cycles. 注意事项This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications. PubMedPubMed 产品介绍Cytokeratin 20 is a type I keratin which is primarily expressed in gastric and intestinal epithelium, urothelium, and Merkel-cells. The keratins are intermediate filament proteins responsible for the structural integrity of epithelial cells and are subdivided into cytokeratins and hair keratins. The type I cytokeratins consist of acidic proteins which are arranged in pairs of heterotypic keratin chains. Their genes are clustered in a region of chromosome 17q12-q21. Cytokeratin 20 is a major cellular protein of mature enterocytes and goblet cells and is specifically expressed in the gastric and intestinal mucosa. It is also expressed in adenocarcinomas of the colon, stomach, pancreas and the bile system and is present in mucinous ovarian tumors, transitional-cell and Merkel-cell carcinomas. Notably, the squamous cell carcinomas and adenocarcinomas of the breast, lung, and endometrium, non-mucinous tumors of the ovary, and small cell carcinomas lack cytokeratin 20. 靶点与功能
细胞角蛋白20(Cytokeratin 20, CK20)是I型酸性角蛋白,分子量约46kDa,主要表达于胃肠道上皮、尿路上皮及 Merkel 细胞。其核心功能与临床价值包括: 组织特异性:正常情况下仅在小肠、结肠、胃黏膜上皮表达,是胃肠道腺癌的特异性标志物; 肿瘤诊断:结直肠癌(阳性率90%)、胃癌(60-70%)、 Merkel 细胞癌(100%)中高表达,与CK7联合检测可区分原发灶(如CK7⁻/CK20⁺提示结直肠来源); 预后意义:结直肠癌中CK20表达强度与淋巴结转移呈正相关,可作为预后评估辅助指标。 实验操作关键要点
IHC-P病理诊断(结直肠癌样本): 抗原修复:采用EDTA缓冲液(pH9.0) 高压修复5分钟(针对福尔马林固定石蜡切片),冷却后用3% H₂O₂封闭10分钟; 阳性定位:肿瘤细胞胞质呈棕黄色颗粒状阳性,典型特征为“灶状或散在分布”(与CK7弥漫表达不同); 抗体稀释:推荐1:1000稀释(5% BSA+TBST),4℃孵育过夜,HRP聚合物二抗室温孵育30分钟。 WB验证(细胞裂解液): 样本选择:阳性对照用结直肠癌细胞系(如HCT116),阴性对照用肺癌细胞系(如A549); 电泳条件:10% SDS-PAGE凝胶,恒压80V浓缩胶、120V分离胶,转膜用0.45μm PVDF膜(250mA恒流1.5小时); 结果判断:46kDa处出现单一特异性条带,阴性对照无条带。 ✨ 重组兔单抗技术优势 相比传统鼠源单抗,重组兔单抗在CK20检测中表现出以下优势: 更高特异性:兔源抗体可识别CK20独特C端表位,避免与CK7/CK19等角蛋白交叉反应; 低背景染色:重组表达工艺减少批次差异,尤其适合IHC中复杂组织(如淋巴结转移灶)的弱信号检测; 宽稀释范围:1:500-2000稀释仍保持稳定信号,降低实验成本。 公司正在出售的产品
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