实用医学杂志 ›› 2025, Vol. 41 ›› Issue (2): 271-277.doi: 10.3969/j.issn.1006-5725.2025.02.018

• 医学检查与临床诊断 • 上一篇    

基于施孔数法筛选抗胎儿血红蛋白单克隆抗体及其在初步诊断β地中海贫血方法中的应用

尹茉莉,徐婧哲,闫宇,童祯骁,刘磊,王会岩()   

  1. 吉林医药学院,吉林省抗体工程科技协同创新中心 (吉林 吉林 132013 )
  • 收稿日期:2024-09-06 出版日期:2025-01-25 发布日期:2025-01-26
  • 通讯作者: 王会岩 E-mail:zswhy518@163.com
  • 基金资助:
    吉林省科技厅项目(20210204186YY)

Screening of anti⁃fetal hemoglobin monoclonal antibodies based on trailing count method and its application in preliminary diagnostic method for β⁃thalassemia

Moli YIN,Jingzhe XU,Yu YAN,Zhenxiao TONG,Lei LIU,Huiyan. WANG()   

  1. Jilin Medical University,Jilin Collaborative Innovation Center for Antibody Engineering,Jilin 132013,Jilin,China
  • Received:2024-09-06 Online:2025-01-25 Published:2025-01-26
  • Contact: Huiyan. WANG E-mail:zswhy518@163.com

摘要:

目的 建立初步诊断β地中海贫血(BT)双抗体夹心ELISA方法。 方法 利用施孔数法筛选分泌抗胎儿血红蛋白(HbF)单抗的杂交瘤细胞株,采用ELISA、改良免疫细胞化学、Western blot方法进一步评价抗体的性质,采用戊二醛标记方法将碱性磷酸酶(ALP)和抗HbF单抗进行偶联,筛选最佳配对抗体用于双抗夹心ELISA方法,对40份临床血样进行检测。 结果 筛选到9株高亲和力分泌抗HbF单抗的杂交瘤细胞株,其中4株HbF单抗(3F7、4G1、6C1、9H7)与HbF特异性结合,与血红蛋白(HbA和HbA2)不发生交叉反应,抗体最高效价为1∶256 000,亲和力最高可达到2.36 × 108 L/mol。与高效液相色谱法比,以3F7作为捕获抗体与ALP-4G1配对建立的双抗夹心ELISA方法通过定量检测HbF含量以区分胎儿和健康人血样,其敏感度达80%。 结论 建立的夹心ELISA方法能够准确测量HbF水平,为临床上诊断BT提供帮助。

关键词: 胎儿血红蛋白, 单克隆抗体, 定量检测, 施孔数法

Abstract:

Objective To establish an initial diagnostic method for β-thalassemia (BT) using a double antibody sandwich ELISA approach. Methods The hybridoma producing monoclonal antibodies against anti-HbF were screened using a trailing count method. The mAbs were evaluated through ELISA, modified immunocytochemistry, and Western blot analysis. A double antibody-sandwich ELISA assay was established by labeling the pairs of mAbs with ALP using the glutaral method, and this detection system was used to analyze 40 serum samples. Results The results demonstrate the successful generation of nine hybridoma cell lines capable of secreting highly active anti-HbF monoclonal antibodies (mAbs). Specifically, four mAbs (3F7, 4G1, 6C1, and 9H7) exhibited exclusive reactivity towards HbF without any cross-reactivity with hemoglobin variants (HbA and HbA2). These four HbF-specific mAbs displayed exceptional specificity and sensitivity, with a maximum titer of 1∶256 000 and the highest affinity constant (Ka) recorded at 2.36×108 L/mol. Among these mAbs, optimal antibody pairing was achieved using capture antibody 3F7 in conjunction with ALP-4G1 for the development of a sandwich ELISA detection method. By employing this approach, fetal and healthy human blood samples were successfully quantified for HbF levels with an impressive detection sensitivity reaching up to 80%. Conclusion This sandwich ELISA demonstrated precise quantification of HbF levels, making it suiTab.for both research and diagnostic purposes in the field of β-thalassemia.

Key words: fetal hemoglobin, monoclonal antibody, quantitative detection, trailing count method

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