摘要目的:观察生物燃料颗粒物（BMF）对肺泡巨噬细胞（AM）的络氨酸激酶抑制剂受体（SIRPα）、肺表面活性蛋白（SP）A和D的表达及吞噬功能的影响。方法:将72只雄性SD大鼠使用随机数字表分为BMF组和清洁空气组，通过蛋白印迹法和免疫荧光检测BMF暴露4 d、1及6个月大鼠AM的SIRPα、SPA和SPD的表达，采用荧光标记金黄色葡萄糖球菌和铜绿假单胞菌，检测三个时间点大鼠AM吞噬细菌的能力。结果:BMF暴露4 d，SIRPα和SPD的蛋白与清洁空气组相比，差异无统计学意义（ P>0.05）；BMF暴露1个月SIRPα和SPD的蛋白相对表达量为（1.73±0.64）和（2.01±0.78），BMF暴露6个月SIRPα和SPD的蛋白相对表达量为（1.49±0.28）和（1.48±0.34），均高于清洁空气组（ P<0.05）。BMF暴露1个月大鼠AM吞噬金黄色葡萄球菌和铜绿假单胞菌的MFI相对比为（0.56±0.16）和（0.80±0.09），BMF暴露6个月大鼠AM吞噬金黄色葡萄球菌和铜绿假单胞菌的MFI相对比为（0.67±0.11）和（0.76±0.16），均低于清洁空气组（ P<0.05）。 结论:BMF诱导AM的SIRPα和SPD的表达上调，抑制AM的吞噬功能。

abstractsObjective:To observe the expression of signal-regulatory protein α (SIRPα), surfactant protein (SP) A, and SPD by, and the phagocytic function of alveolar macrophages (AMs) in the rats exposed to biomass ambient particulate matter (BMF).Methods:Seventy-two male SD rats were randomly divided into BMF group and clean air group. Protein levels of SIRPα, SPA, and SPD in AMs were determined by Western blotting and immunofluorescent assay after 4 days, 1 month, and 6 months of BMF exposure. Fluorescent labeled Glucose aureus and Pseudomonas aeruginosa were used to detect the phagocytic ability of AMs in rats at three time points. Results:After 4 days of BMF exposure, there was no significant difference in the protein levels of SIRPα and SPD compared with the clean air group ( P>0.05). The relative levels of SIRPα and SPD were (1.73±0.64) and (2.01±0.78) at 1 month of BMF exposure, and those at 6 months of BMF exposure were (1.49±0.28) and (1.48±0.34), both of which were higher than those in the clean air group ( P<0.05). The relative level of Staphylococcus aureus median fluorescence intensity (MFI) and Pseudomonas aeruginosa MFI at 1 month BMF group were (0.56±0.16) and (0.80±0.09), and those at 6 months BMF group were (0.67±0.11) and (0.76±0.16), both of which were lower than those in clean air group, and the difference was statistically significant ( P<0.05). Conclusions:BMF induces upregulation of SIRPα and SPD in AMs and inhibits the phagocytosis of AMs.