ABSTRACT
Objective To investigate the role of RUNX3 in the regulation of macrophage polarization so as to provide a new therapeutic approach for immunity-related diseases.Methods ① After RAW264.7 cells were stimulated by IFN-γ,LPS and IL-4,respectively,the expressions of their surface markers(arginase-1 and iNOS) were detected by RT-PCR to observe whether RAW264.7 cells polarized to M1 or M2 after stimulation by IFN-γ, LPS and IL-4.The cells stimulated by IFN-γ and LPS were named group M1 and those stimulated by IL-4 were group M2;the control group was group M0.② The expression of RUNX3 was detected by immunofluorescence and RT-PCR methods in each cell group(M1,M2 and M0).③ RUNX3 over-expression vector was established.The RUNX3 gene in RAW264.7 cells was silenced.Cell lines with stable expression were screened with G 418 culture medium.The expressions of cell surface markers iNOS and CD86 were detected by RT-PCR;cell secretion(TNF-α) was detected using ELESA method.Results ① Stimulation of RAW264.7 cells with IFN-γ and LPS could induce RAW264.7 cells to polarize into M1 type macrophages.The mRNA expression of iNOS in M1 group was higher than that in group M0 detected by RT-PCR(P= 0.002),while using IL-4 to stimulate RAW264.7 cells could induce RAW264.7 cells to polarize into M2 macrophages.The results of RT-PCR detection showed that the expression of arginase-1 was higher in M2 group than in group M0(P=0.021).② The expression of RUNX3 mRNA in the M1 cells group was higher than that in the M0 cells group(P= 0.001),but the expression in the M2 cells group was decreased(P=0.041).③ After silencing of RUNX3,the expressions of RAW264.7 cell surface markers CD86 and iNOS(P=0.005)and the cells secretion of TNF-α(P＜0.001)were decreased compared with those in the control group.Conclusion RUNX3 transcriptional activation may promote the differentiation of macrophages into M1 type.