Journal of Southern Medical University ›› 2012, Vol. 32 ›› Issue (07): 919-.

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An anti-human ovarian carcinoma and CD3 bispecific single-chain antibody mediates CDR3 spectratype drift of T cell receptor alpha and beta chains

LUO Wei, WEN Qian, ZHOU Mingqian, MA Li   

  1. 南方医科大学生物技术学院分子免疫学研究所
  • Online:2012-07-20 Published:2012-07-20

Abstract: Objective To analyze the drift of T cell receptor (TCR) Vα and Vβ gene family CDR3 spectratype in response to
ovarian carcinoma cells mediated by an anti-human ovarian carcinoma/CD3 bispecific single-chain antibody (BHL-1), and
explore the mechanism of the bispecific single-chain antibody-mediated T cell immune response. Methods Immunoscopic
spectratyping technique was used to analyze the TCR repertoire diversity (CDR3 spectratype distribution) of the T cells from 6
healthy donors before and after stimulation of the cells with human ovarian carcinoma in the presence of BHL-1. The
predominant usage of TCR α and β chain CDR3 was analyzed after the stimulation, and sequence analysis was performed for
the CDR3 region of the monoclonal T cells. Results The spectratypes of Vα and Vβ gene family TCR CDR3 region showed a
Gaussian distribution before stimulation of the T cells from the 6 donors. After stimulation of the T cells, CDR3 spectratype
drift occurred in the T cells, and some TCR Vα and Vβ families showed an anomalous and oligoclonal expansion. Different
CDR3 sequences of the Vα and Vβ gene family TCR were found in the monoclonal T cells stimulated with BHL-1. Conclusion
CDR3 spectratype drift occurs in TCR α and β chains of T cells after stimulation with human ovarian carcinoma cells and
BHL-1, indicating that the predominant usage of TCR Vα and Vβ families is associated with the specific T cell immune
response mediated by BHL-1.