ApplicationsCD47-SIRPα轴研究工具与药物开发应用
一、CD47-SIRPα轴的生物学基础与治疗价值1.1 "别吃我"信号与肿瘤免疫逃逸CD47(整合素相关蛋白)是免疫球蛋白超家族成员,在多种肿瘤细胞表面高表达。SIRPα(信号调节蛋白α)高表达于髓系细胞表面,包括巨噬细胞、树突状细胞、中性粒细胞和单核细胞。两者的相互作用传递"别吃我"信号,抑制巨噬细胞的吞噬功能,是肿瘤细胞实现免疫逃逸的关键机制。临床相关性
一、CD47-SIRPα轴的生物学基础与治疗价值
1.1 "别吃我"信号与肿瘤免疫逃逸
CD47(整合素相关蛋白)是免疫球蛋白超家族成员,在多种肿瘤细胞表面高表达。SIRPα(信号调节蛋白α)高表达于髓系细胞表面,包括巨噬细胞、树突状细胞、中性粒细胞和单核细胞。两者的相互作用传递"别吃我"信号,抑制巨噬细胞的吞噬功能,是肿瘤细胞实现免疫逃逸的关键机制。
临床相关性:
- CD47过表达与急性髓系白血病(AML)、非霍奇金淋巴瘤、多发性骨髓瘤等多种血液肿瘤的不良预后相关
- 实体瘤中,CD47高表达与食管癌、乳腺癌、胃癌等预后不良相关
- 从意义未明的单克隆丙种球蛋白病(MGUS)进展到多发性骨髓瘤过程中,CD47表达显著上调
1.2 靶向治疗策略的科学依据
阻断CD47-SIRPα轴可恢复巨噬细胞对肿瘤细胞的吞噬功能,是当前肿瘤免疫治疗的热点方向。主要策略包括:
- 抗CD47单克隆抗体(如Hu5F9-G4/Magrolimab)
- SIRPα-Fc融合蛋白(如TTI-621、TTI-622、Evorpacept)
- 双特异性抗体(如IMM0306,CD20 mAb与SIRPα CD47结合域融合)
二、产品系列与科研应用
2.1 CD47重组蛋白产品系列
货号 | 产品名称 (Product Name) | 物种 | 标签 | 产品规格 |
Recombinant Human CD47 Protein | Human | No tag | 25ug/100ug/500ug | |
Recombinant Human CD47 | Human | C-His | 25ug/100ug/500ug/1mg | |
Recombinant Human CD47 Protein | Human | C-His | 25ug/100ug/500ug | |
Recombinant Human CD47 Protein | Human | C-hFc | 25ug/100ug/500ug | |
Recombinant Rat CD47 Protein | Rat | C-hFc | 50ug/100ug/500ug | |
Recombinant Mouse CD47 Protein | Mouse | C-His | 25ug/100ug/500ug | |
Recombinant Mouse CD47 Protein | Mouse | C-hFc | 25ug/100ug/500ug | |
Recombinant Biotinylated Human CD47 Protein | Human | C-His-Avi | 25ug/100ug/500ug | |
Recombinant Biotinylated Human CD47 Protein | Human | C-hFc-Avi | 25ug/100ug/500ug | |
Recombinant FITC-Labeled Human CD47 Protein | Human | C-His | 25ug/100ug/500ug | |
Recombinant Biotinylated Mouse CD47 Protein | Mouse | C-His-Avi | 100ug |
2.2 SIRPα重组蛋白产品系列(V1-V8剪接变体)
货号 | 产品名称 (Product Name) | 物种 | 标签 | 产品规格 |
Recombinant Human SIRP alpha/CD172a | human | C-His | 25ug/100ug/500ug | |
Recombinant Human SIRP alpha/CD172a Protein | human | C-hFc | 25ug/100ug/500ug | |
Recombinant Mouse SIRP alpha/CD172a Protein | Mouse | C-His | 25ug/100ug/500ug | |
Recombinant Mouse SIRP-α/CD172A Protein | Mouse | C-hFc | 100ug/500ug | |
Recombinant Rat SIRP-α/CD172a Protein | Rat | C-hFc | 100ug/500ug | |
Recombinant Rat SIRP-α/CD172a Protein | Rat | C-His | 100ug/500ug | |
Recombinant Cynomolgus SIRP alpha/CD172a Protein | Cynomolgus | C-His | 25ug/100ug/500ug | |
Recombinant Human SIRP alpha V2/CD172a Protein | human | C-His | 25ug/100ug/500ug | |
Recombinant Human SIRP alpha V2/CD172a | human | C-hFc | 25ug/100ug/500ug | |
Recombinant Human SIRP alpha V3 Protein | human | C-His-Avi | 25ug/100ug/500ug | |
Recombinant Human SIRP alpha V5 Protein | human | C-His-Avi | 25ug/100ug/500ug | |
Recombinant Human SIRP alpha V6 Protein | human | C-His-Avi | 25ug/100ug/500ug | |
Recombinant Human SIRP alpha V8 Protein | human | C-His-Avi | 25ug/100ug/500ug |
三、核心应用场景与实验方案
CD47-SIRPα相互作用检测
应用实例:TR-FRET高通量筛选。根据已发表研究方法,使用生物素标记的SIRPα与His标记的CD47可建立时间分辨荧光共振能量转移(TR-FRET)检测体系。
巨噬细胞吞噬功能检测(ADCP)
实验原理: 肿瘤细胞过表达CD47 → 与巨噬细胞SIRPα结合 → 传递"别吃我"信号 → 抑制吞噬加入SIRPα-hFc融合蛋白 → 竞争性阻断CD47-SIRPα相互作用 → 恢复巨噬细胞吞噬功能
双特异性抗体开发参考
IMM0306机制研究模型: IMM0306是CD20 mAb与SIRPα CD47结合域的融合蛋白,通过同时结合CD20和CD47激活巨噬细胞和NK细胞。
SIRPα剪接变体功能研究
SIRPα存在多种剪接变体(V1-V8),不同变体在胞外域长度和糖基化模式上存在差异,可能影响与CD47的结合亲和力。比较不同剪接变体与CD47的结合亲和力,筛选最优治疗性融合蛋白骨架。
四、产品数据展示
Human CD47 on Bis-Tris PAGE under reduced condition. The purity is greater than 95%
The purity of Human CD47 is greater than 95% as determined by SEC-HPLC
Immobilized Human CD47, No Tag at 5μg/ml (100μl/well) on the plate. Dose response curve for Human SIRP alpha, hFc Tag with the EC50 of 0.24μg/ml determined by ELISA
95088ES# Recombinant Human CD47 Protein数据展示
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