hTIGIT

品系全名

C57BL/6JSmo-Tigittm1(hTIGIT)Smoc

目录号

NM-HU-00053

品系状态

胚胎冻存

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基因信息

基因名
TIGIT

品系描述

通过同源重组,将小鼠基因Tigit进行人源化修饰。与此相似的品系还有hTIGIT(NM-HU-200244),详细信息请咨询技术顾问。
应用领域:免疫治疗;肿瘤研究;药物筛选

验证数据

RT-PCR验证数据

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Fig1. Detection of TIGIT expression by RT-PCR. 

Wild type: only one band at 305 bp with primers F2/R2(mTigit);

Homozygous: only one band at 300 bp with primers F1/R1(hTIGIT); 

Abbr.. M, DNA marker; HO, homozygous; HE, heterozygous; WT, wild type.


流式验证数据


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图2.  FACS 检测 TIGIT 人源化小鼠极化 CD4+T 细胞中人源 TIGIT 表达。Tigit 人源化杂合子小鼠分离脾脏 Naive CD4+T 细胞,经细胞因子和抗体体外刺激激活扩增后,再使用 PMA/ ionomycin 重刺激,FACS 检测极化后 CD4+T 细胞人源 TIGIT 表达。结果显示:在 TIGIT 人源化小鼠极化CD4+T 细胞中可以检测到人源 TIGIT 的活跃表达,并且人源 TIGIT 和鼠源 Tigit 表达趋势类似。


单药药效验证数据

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图3 TIGIT人源化小鼠Hepa1-6荷瘤模型体内抗肿瘤药效验证。TIGIT人源化纯合子小鼠接种Hepa1-6 肝癌细胞系肿瘤平均生长至约110mm3 时给药。结果显示:针对TIGIT 靶点阳性药物Tiragolumab给药表现出显著的疗效。


联合用药药效验证数据

tigit 药效.png

tigit 药效-1.png

图4. TIGIT人源化小鼠MC38荷瘤模型体内抗肿瘤药效验证。TIGIT人源化纯合子小鼠接种MC38 结肠癌细胞系第8天,肿瘤平均生长至约130mm3 时,将动物随机分组(n=7)用药。结果显示:针对人的TIGIT抗体单独给药未见明显抗肿瘤效果,但针对TIGIT 抗体与PD-L1 抗体联合给药表现出显著的疗效。以上数据证明, TIGIT人源化小鼠模型是评估人TIGIT抗体体内药效的有效工具。

Case Study 1

1 月 6 日,信达生物制药研发的1类新药 IBI939 获批临床,其中用于申报的重要体内实验数据来自于南模生物的TIGIT人源化小鼠。IBI939 成为国内首个获批临床的TIGIT抗体,拟用于治疗晚期肿瘤(血液肿瘤和实体瘤)。


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