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细胞角蛋白20抗体
包装与价格:
产品名称 Cytokeratin 20 Mouse mAb 产品介绍
细胞角蛋白20抗体 商品属性
中文名称细胞角蛋白20抗体 别 名CK 20; CK20; 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Mouse 克隆类型Monoclonal 克 隆 号18F9 交叉反应Human,Mouse,Rat 产品应用IHC-P=1:100-500,IHC-F=1:100-500,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KLH conjugated synthetic peptide derived from human CK20 亚 型IgG2b,k 纯化方法affinity purified by Protein A 缓 冲 液Liquid in PBS containing 50% Glycerol, 0.5% BSA and 0.02% Proclin300. 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型酸性细胞角蛋白家族成员,与CK8等II型角蛋白形成异二聚体,参与上皮细胞骨架构建。其核心特点包括: 组织特异性:主要表达于胃肠道上皮(小肠、结肠黏膜)、尿路上皮及 Merkel 细胞,正常情况下不表达于肺、乳腺、前列腺等组织,是消化道肿瘤诊断的“金标准”标志物; 肿瘤诊断价值:在结直肠癌、胃癌、胰腺癌等腺癌中高表达,而肺鳞癌、乳腺癌等则阴性,可用于肿瘤来源鉴别(如转移癌原发灶判断); 生理功能:维持肠上皮角蛋白纤维结构稳定,磷酸化状态下参与小肠黏蛋白分泌,与上皮损伤修复相关。 实验操作关键要点
IHC-P病理诊断(结直肠癌组织): 抗原修复:采用柠檬酸钠缓冲液(pH6.0) 微波修复20分钟(95℃),冷却至室温; 阳性定位:癌细胞胞质弥漫性棕黄色着色,正常肠黏膜上皮细胞呈阳性,神经内分泌细胞和潘氏细胞阴性(可排除干扰); 对照设置:必须包含正常结肠组织(阳性对照)和肺鳞癌组织(阴性对照,验证特异性)。 WB检测(SW480结肠癌细胞): 样本处理:使用含1mM NaF(磷酸酶抑制剂) 的RIPA裂解液冰上裂解30分钟,12000g离心15分钟取上清; 电泳条件:10% SDS-PAGE凝胶,恒压120V电泳90分钟,转膜选用0.45μm PVDF膜; 抗体孵育:单抗1:20000稀释(5% BSA+TBST),4℃孵育过夜,HRP二抗1:10000室温孵育1小时,曝光时间5-10秒(避免信号过强)。 流式细胞术(肠上皮细胞分选): 样本制备:新鲜肠组织用EDTA消化为单细胞悬液,4%多聚甲醛固定15分钟,0.1% Triton X-100透化10分钟; 抗体染色:抗体1:1000稀释,4℃避光孵育30分钟,流式细胞仪检测(激发波长488nm,发射波长525nm)。 公司正在出售的产品
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