Imiquimod 以 TLR7非依赖途径诱导THP-1来源的巨噬细胞凋亡

Imiquimod induces the apoptosis of THP-1 derived macrophages through TLR7 independent pathway

目的：探讨TLR7在imiquimod引起的THP-1来源的巨噬细胞凋亡中的作用。方法选择TLR7表达强度不同的细胞系（ THP-1巨噬细胞、MDCK细胞和HUVEC细胞），通过MTT法分别检测经不同浓度imiquimod处理后细胞的存活率。酶联免疫吸附试验检测通过TLR7抑制剂氯喹、TLR7-siRNA处理减少TLR7表达后，细胞上清液中IL-6的水平。流式细胞术进一步检测抑制TLR7表达后，imiquimod对THP-1巨噬细胞凋亡的影响。结果 Imiquimod能引起THP-1巨噬细胞、MDCK细胞和HUVEC细胞这3种细胞的凋亡。氯喹和TLR7-siRNA处理减少TLR7表达后，能显著降低IL-6的水平，但不影响imiquimod引起的THP-1巨噬细胞凋亡。结论 Imiquimod可通过TLR7非依赖方式引起细胞凋亡。

Objective To investigate the effects of TLR7 on imiquimod induced apoptosis of THP-1 derived macrophages.Methods Three cell lines （ THP-1 derived macrophages, MDCK cell line and HUVEC cell line） with different capabilities of expressing TLR7 were selected.The survival rates of cells af-ter the treatment with different concentrations of imiquimod were detected by MTT assay.The levels of IL-6 in the supernatants of TLR7 inhibitor chloroquine or TLR7-siRNA treated cells were detected by enzyme-linked immunosorbent assay.The apoptosis of cells was detected by flow cytometry after inhibiting the ex-pression of TLR7.Results Imiquimod induced the apoptosis of THP-1 derived macrophages, MDCK cell lines and HUVEC cell lines.The levels of IL-6 were significantly decreased as the expression of TLR7 was inhibited by treating THP-1 derived macrophages with chloroquine or TLR7-siRNA.Treating THP-1 derived macrophages with chloroquine or TLR7-siRNA did not affect the cell apoptosis induced by imiquimod.Con-clusion Imiquimod could induce the apoptosis of THP-1 derived macrophages through TLR7 independent pathway.