Effect of low dose cyclophosphamide on function of CD4~+CD25~+Treg cells of mice with Lewis lung cancer / 吉林大学学报(医学版)

ABSTRACT

Objective To study the effect of low dose cyclophosphamide on function of CD4+CD25+Treg of mice with Lewis lung cancer and investigate the relationship between CD4+CD25+Treg and the genesis and development of tumor.Methods The models were divided into three groupsCTX group,tumor group and control group.In CTX group,models were established by injection CTX(25 mg?kg-1) and subcultivated Lewis lung cancer cells were injected subcutaneously to the right axilla of C57BL/6 mice 7 d later.The dynamic changes of tumor volume were observed.The changes of the number of CD4+CD25+Treg were detected by flow cytometer and the expression of Foxp3 mRNA in spleen was analyzed by semi-quantitative RT-PCR.The changes of T lymphocyte proliferation in spleen were detected by MTT test.The changes of T lymphocyte killing function in spleen were detected by LDH releasing test.Results Compared with tumor group,CTX treatment might delay the development of tumor in 19 d-mice with Lewis lung cancer.The number of CD4+CD25+ Treg in spleen of mice in CTX group was lower than that in tumor group(P0.05).Conclusion After CTX injection,the number of CD4+CD25+Treg and the expression of Foxp3 mRNA in spleen of mice with Lewis lung cancer decrease,the immunological function of mice with Lewis lung cancer increase.It can provid experiment evidence for the tumor immunotherapy aimed directly at CD4+CD25+Treg.