ABSTRACT
OBJECTIVE@#To explore the regulatory effect of chidamide on CD8+ T cells in T-cell acute lymphoblastic leukemia.@*METHODS@#The expression levels of CXCL9 and CXCL3 mRNA in Jurkat cells, lymphocytes treated with chidamide and lymphocytes co-cultured with chidamide-treated Jurkat cells were detected by fluorescence quantitative PCR. The proportion of CD8+ T cells in lymphocytes treated with chidamide and lymphocytes co-cultured with chidamide-treated Jurkat cells was determined by flow cytometry.@*RESULTS@#Chidamide upregulated CXCL9 mRNA expression in Jurkat cell line in a dose-dependent manner (r=0.950). The mRNA expression of CXCL9 in chidamide 5 μmol/L group was 164 times higher than that in control group. Chidamide upregulated CXCL9 mRNA expression in lymphocytes, but the up-regulated level was significantly lower than that in Jurkat cell line treated with the same concentration of chidamide. Co-culture with chidamide treated Jurkat cells upregulated the proportion of CD8+ T cells in lymphocytes.@*CONCLUSION@#In T-cell acute lymphoblastic leukemia, chidamide may increase the concentration of CXCL9 in the tumor microenvironment by up-regulating the expression of CXCL9 in tumor cells, leading to an increase in the number of CD8+ T cells.