靶向凝血因子FⅨa-FⅧa复合物结合位点的新型抗栓抗体

doi:10.3969/j.issn.1674-8115.2021.09.001

上海交通大学学报(医学版) ›› 2021, Vol. 41 ›› Issue (9): 1133-1141.doi: 10.3969/j.issn.1674-8115.2021.09.001

• 创新团队成果专栏 •

靶向凝血因子FⅨa-FⅧa复合物结合位点的新型抗栓抗体

孙天瑶¹(), 蒋时枫²(), 徐沁², 刘俊岭¹, 党素英¹(), 樊雪梅¹()

^1.上海交通大学生物化学与分子细胞生物学系，上海 200025
^2.上海交通大学生命科学技术学院生物工程系，上海 200240

收稿日期:2021-03-09 出版日期:2021-08-24 发布日期:2021-08-24
通讯作者: 党素英,樊雪梅 E-mail:sty19950531@163.com;jack-carpenter@sjtu.edu.cn;suyingdang@shsmu.edu.com;fanxuemei@sjtu.edu.cn
作者简介:孙天瑶（1995—），女，硕士生；电子信箱：sty19950531@163.com
蒋时枫（1998—），男，本科生；电子信箱：jack-carpenter@sjtu.edu.cn。第一联系人：为共同第一作者。
基金资助:
国家自然科学基金(81970123);上海交通大学医学院高水平地方高校创新团队(SSMU-ZDCX20180101)

A novel antithrombotic antibody targeting the binding sites of the coagulation factor FⅨa-FⅧa complex

Tian-yao SUN¹(), Shi-feng JIANG²(), Qin XU², Jun-ling LIU¹, Su-ying DANG¹(), Xue-mei FAN¹()

^1.Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
^2.Department of Bioengineering, School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2021-03-09 Online:2021-08-24 Published:2021-08-24
Contact: Su-ying DANG,Xue-mei FAN E-mail:sty19950531@163.com;jack-carpenter@sjtu.edu.cn;suyingdang@shsmu.edu.com;fanxuemei@sjtu.edu.cn
Supported by:
National Natural Science Foundation of China(81970123);Innovative Research Team of High-level Local Universities in Shanghai(SSMU-ZDCX20180101)

摘要/Abstract

摘要：

目的·制备以内源性凝血途径中关键的凝血因子Ⅸa（coagulation factor Ⅸa，FⅨa）为靶点的单克隆抗体，并研究其抗栓功能及作用机制。方法·通过免疫小鼠、杂交瘤技术、单克隆抗体细胞表达纯化技术，制备高纯度的抗FⅨa单克隆抗体；通过酶联免疫吸附测定筛选与FⅨa具有高亲和力的单抗，利用活化部分凝血活酶时间（activated partial thromboplastin time，APTT）和凝血酶原时间（prothrombin time，PT）评估单抗的抗栓效果；然后利用发色底物法检测其对FⅨa酶活性的影响；采用计算机模拟蛋白-蛋白对接的方法预测抗体与FⅨa相互作用可能的结合位点，并通过竞争实验（间接通过发色底物法）对这一结合位点进行验证。结果·制备得到1种高亲和力抗FⅨa的单克隆抗体FⅨa-4；虽然它不影响PT和FⅨa的酶活性，但可显著延长APTT至88.8 s，是对照组（25.5 s）的3.5倍，并且具有浓度依赖性。蛋白-蛋白对接预测结果发现，FⅨa-4不直接与FⅨa的底物催化位点结合，而是占据了FⅨa和FⅧa的结合区域。竞争实验进一步验证了上述结果，FⅨa-4以剂量依赖的方式抑制FⅩa的生成，FⅨa-4的浓度达到400 pmol/L即可使FⅩa的生成几乎完全被抑制，而FⅧa可纠正抗体的抑制作用达到近50%。结论·获得抗FⅨa的单抗FⅨa-4；FⅨa-4与FⅧa竞争性结合FⅨa阻碍了FⅧa-FⅨa复合物形成，阻断FⅩ向FⅩa的转化，该抗体主要通过抑制内源性凝血途径发挥抗栓作用。

关键词: 凝血因子Ⅸa, 单克隆抗体, 活化部分凝血活酶时间, 酶活性, 凝血因子Ⅷa, 抗栓作用

Abstract:

Objective·To prepare a monoclonal antibody targeting coagulation factor Ⅸa (FⅨa), a key factor in endogenous coagulation pathways, and study its antithrombotic roles and mechanisms.

Methods·Immunization of mice, hybridoma technology, cell expression and purification were used to prepare the anti-FⅨa monoclonal antibodies of high purity. The monoclonal antibodies with high affinity for FⅨa were screened by enzyme-linked immunosorbent assay. The activated partial thromboplastin time (APTT) and prothrombin time (PT) were used to evaluate the antithrombotic effects of the monoclonal antibody. And then chromogenic substrate method was used to detect the effect of monoclonal antibody on the enzyme activity of FⅨa. The method of computer simulation of protein-protein docking was adopted to predict the possible binding sites between FⅨa and the antibody, and the binding site, was verified by competitive experiments (indirectly through the chromatic substrate method).

Results·FⅨa-4, an anti-FⅨa monoclonal antibody with high affinity, was generated. Although FⅨa-4 did not affect PT and the enzyme activity of FⅨa, it significantly prolonged APTT to 88.8 s, which was 3.5 times of the control group (25.5 s), in a concentration-gradient dependence. The protein-protein docking prediction results revealed that FⅨa-4 did not directly bind to substrate catalytic sites of FⅨa, but occupied the binding region of FⅨa and FⅧa. Competitive experiments further verified the above results. FⅨa-4 inhibited FⅩa production in a dose-dependent manner, almost completely inhibiting FⅩa production at the concentrations of 400 pmol/L, and FⅧa could correct the inhibition effect of the antibody up to nearly 50%.

Conclusion·The monoclonal antibody against FⅨa-4 is obtained. FⅨa-4 competes with FⅧa to bind FⅨa, and inhibits the conversion of FⅩ to FⅩa which is catalyzed by FⅧa-FⅨa complex; it plays an antithrombotic role mainly by inhibiting endogenous coagulation pathway.

Key words: coagulation factor Ⅸa (FⅨa), monoclonal antibody, activated partial thromboplastin time (APTT), enzyme activity, coagulation factor Ⅷa (FⅧa), antithrombosis

中图分类号:

孙天瑶, 蒋时枫, 徐沁, 刘俊岭, 党素英, 樊雪梅. 靶向凝血因子FⅨa-FⅧa复合物结合位点的新型抗栓抗体[J]. 上海交通大学学报(医学版), 2021, 41(9): 1133-1141.

Tian-yao SUN, Shi-feng JIANG, Qin XU, Jun-ling LIU, Su-ying DANG, Xue-mei FAN. A novel antithrombotic antibody targeting the binding sites of the coagulation factor FⅨa-FⅧa complex[J]. JOURNAL OF SHANGHAI JIAOTONG UNIVERSITY (MEDICAL SCIENCE), 2021, 41(9): 1133-1141.

图/表 5

图1 FⅨa-4与FⅨa的亲和力及对内源性和外源性凝血途径的影响Note： A. Affinity of FⅨa-4 antibodies to FⅨa. B. Effect of FⅨa-4 on APTT. C. Effect of FⅨa-4 on PT.

Fig 1 Affinity between FⅨa-4 and FⅨa and its effect on endogenous and exogenous coagulation pathways

图2 FⅨa-4对FⅨa催化活性的影响

Fig 2 Effect of FⅨa-4 on FⅨa catalytic activity

表1 FⅨa与FⅨa-4结合面上的接触残基

Tab 1 Most frequent residues of FⅨa contacting with FⅨa-4

Residue	Contact frequency/%
Asn-c 93^①	62
Ala-c 95^②	34
Lys-c 98^②	32
Lys-c 126	87
Asn-c 129	45
Lys-c 132^①	48
Asp-c 164^②	30
Arg-c 165^①	90
Lys-c 173^②	33
Thr-c 175^①	33
Tyr-c 177^②	45
Asn-c 178	93
Lys-c 230	46
Arg-c 233	95
Asn-c 236	36

图3 FⅨa-4（红色）与FⅨa催化结构域（蓝色）的结合面预测Note： A. Active site of FⅨa (green) was not blocked by the binding of FⅨa-4. B. Contact surface between FⅨa-4 and FⅨa overlaped part of the predicted binding sites between FⅨa and FⅧa (yellow). C. Back view of B.

Fig 3 Binding surface prediction between the antibody FⅨa-4 (red) and FⅨa catalytic domains (blue)

图4 FⅨa-4与FⅧa竞争性结合FⅨa的验证Note： A. Inhibition of FⅨa-4 on the production of FⅩa. B. Correction of FⅧa in the inhibition of FⅨa-4.

Fig 4 Verification of FⅨa-4 competed with FⅧa in combination with FⅨa

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靶向凝血因子FⅨa-FⅧa复合物结合位点的新型抗栓抗体

A novel antithrombotic antibody targeting the binding sites of the coagulation factor FⅨa-FⅧa complex

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