白细胞介素-34对人外周血单核细胞来源的巨噬细胞极化和迁移能力的影响

Effect of interleukin-34 on the polarization and migration ability of macrophages derived from human peripheral blood monocytes

目的探讨白细胞介素(IL)-34对人外周血单核细胞来源的巨噬细胞极化和迁移能力的影响。方法采用免疫磁珠分选法从人外周血单核细胞中分选CD14+单核细胞,并使用流式细胞仪检测CD14+单核细胞纯度。将CD14+单核细胞分为M1型组、IL-34-M1型组、M2型组、IL-34-M2型组,M1型组和IL-34-M1型组细胞加入粒细胞-巨噬细胞集落刺激因子(GM-CSF)诱导5 d后,半量换液,加入干扰素-γ、脂多糖、IL-6和GM-CSF继续诱导4 d;M2型组和IL-34-M2型组细胞加入巨噬细胞集落刺激因子(M-CSF)诱导5 d后,半量换液,加入M-CSF、IL-4、IL-6和IL-13继续诱导4 d。IL-34-M1型组和IL-34-M2型组细胞于诱导开始和诱导第5天加入IL-34进行共诱导。诱导第9天,采用流式细胞术检测各组细胞中CD14+CD86+细胞(M1型巨噬细胞)和CD14+CD163+细胞(M2型巨噬细胞)比例,采用Transwell小室实验检测M2型组、IL-34-M2型组细胞迁移能力。结果通过磁珠分选法获得了高纯度的CD14+单核细胞,CD14阳性率为(96.77±2.72)%,可用于巨噬细胞的诱导。M1型组、IL-34-M1型组中CD14+CD86+细胞比例分别为(43.20±7.59)%、(27.87±2.06)%,M2型组、IL-34-M2型组中CD14+CD163+细胞比例分别为(47.70±4.49)%、(58.95±3.65)%;IL-34-M1型组中CD14+CD86+细胞比例显著低于M1型组(P<0.05),IL-34-M2型组中CD14+CD163+细胞比例显著高于M2型组(P<0.05)。M2型组、IL-34-M2型组巨噬细胞迁移数分别为(97.8±9.0)、(205.6±21.9)个;IL-34-M2型组巨噬细胞迁移数显著多于M2型组(P<0.05)。结论IL-34可抑制人单核细胞来源的巨噬细胞向M1型极化,促进巨噬细胞向M2型极化,并可增强M2型巨噬细胞的迁移能力。

Objective To investigate the effects of interleukin(IL)-34 on the polarization and migration ability of macrophages derived from human peripheral blood monocytes.Methods The CD14+monocytes were isolated from human peripheral blood monocytes by immunomagnetic bead sorting,and the purity of CD14+monocytes was detected by flow cytometry.The CD14+monocytes were divided into M1 type group,IL-34-M1 type group,M2 type group and IL-34-M2 type group.The cells in the M1 type group and IL-34-M1 type group were added granulocyte-macrophage colony stimulating factor(GM-CSF)to induce for 5 days,and half of the fluid was changed,and then the interferon-γ,lipopolysaccharides,IL-6 and GM-CSF were added for another 4-day induction;the cells in the M2 type group and IL-34-M2 type group were added macrophage colony stimulating factor(M-CSF)to induce for 5 days,and half of the fluid was changed,and M-CSF,IL-4,IL-6,and IL-13 were added for another 4-day induction.The cells in IL-34-M1 group and IL-34-M2 group were co-induced with IL-34 at the beginning of induction and on the 5 th day of induction.On the 9 th day of induction,the proportion of CD14+CD86+cells(M1 type macrophages)and CD14+CD163+cells(M2 type macrophages)in each group was detected by flow cytometry,and the migration ability of cells in the M2 type group and IL-34-M2 type group was detected by the Transwell chamber experiments.Results High purity CD14+monocytes were obtained through magnetic bead sorting,with a CD14 positive rate of(96.77±2.72)%,which could be used for macrophage induction.The proportion of CD14+CD86+cells in the M1 type group and IL-34-M1 type group was(43.20±7.59)%and(27.87±2.06)%,respectively.The proportion of CD14+CD163+cells in the M2 type group and IL-34-M2 type group was(47.70±4.49)%and(58.95±3.65)%,respectively;the proportion of CD14+CD86+cells in the IL-34-M1 type group was significantly lower than that in the M1 type group(P<0.05),while the proportion of CD14+CD163+cells in the IL-34-M2 type group was significantly higher than that in the M2 type group(P<0.05).The number of migrating cells of macrophages in the M2 type group and IL-34-M2 type group was 97.8±9.0 and 205.6±21.9,respectively;the number of migrating cells of macrophages in the IL-34-M2 type group was significantly higher than that in the M2 type group(P<0.05).Conclusion IL-34 can inhibit the polarization of macrophages derived from human monocytes cells towards M1 type,promote the polarization of macrophages towards M2 type,and enhance the migration ability of M2 type macrophages.