RESUMO
Objective:To investigate the gene expression of TCR V? subfamily T cells and clonality in peripheral blood CD4+ and CD8+ cells from patients with chronic myelogenous leukemia-chronic phase(CML-CP).Methods:The complementarity determining region 3(CDR3)of TCR V? subfamily genes in peripheral blood mononuclear cells(PBMCs),sorted CD4+ and CD8+ cells from 19 CML-CP patients were amplified using RT-PCR,the products were further by genescan analysis to identify the clonality of T cells.Results:Only 1 to 21 V? subfamilies were detected in peripheral blood CD4+ and CD8+ cells from patients with CML.The most frequent expression of V? subfamily was V?13 followed by V?9.Clonal expanded T cells in some V? subfamilies could be identified in both CD4+ and CD8+ cells,especially in CD8+ cells.The clonal expanded of V?21 subfamily in CD4+ cells and V?11 subfamily in CD8+ cells were identified most frequently.Conclusion:The restricted distribution of TCR V? repertoire has been found in CD4+ and CD8+ cells in patients with CML.Clonal expanded CD4+ cells and CD8+ cells have been identified which may relate to host immune response to CML antigen and may play a important role in anti-CML effect.