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经活化的肺泡巨噬细胞（ＰＡＭ）能抑制Ｈｅｌａ细胞的增殖，其细胞毒性指数为５７．９０±２．４８（Ｐ＜０．０１）。ＰＡＭ的这种细胞毒功能可被大气飘尘（ＡＰ）降低，在ＡＰ浓度为１０～１００μｇ／ｍｌ范围内这种降低作用显示剂量－反应关系，在１０、５０、１００μｇ／ｍｌＡＰ作用下，ＰＡＭ对Ｈｅｌａ细胞的细胞毒指数分别为５１．９１±３．６７（Ｐ＞０．０５）、４０．８３±２．１４（Ｐ＜０．０１）、３２．３３±４．５５（Ｐ＜０．０１）。在５００μｇ／ｍｌＡＰ作用下，由于大量的ＰＡＭ脱落和死亡，其细胞毒指数仅为１４．９８±３．２９（Ｐ＜０．０１）。提示大气飘尘具有降低肺巨噬细胞抗肿瘤免疫的作用。
Activated alveolar macrophages (PAMs) inhibited Hela cell proliferation with a cytotoxicity index of 57.90 ± 2.48 (P <0.01). This cytotoxicity of PAM was reduced by atmospheric airborne dust (AP). The dose-response relationship was shown in the range of 10-100 μg / ml of AP. Under the action of 10, 50 and 100 μg / ml AP, The cytotoxicity index of Hela cells were 51.91 ± 3.67 (P> 0.05), 40.83 ± 2.14 (P <0.01) and 32.33 ± 4.55 (P <0. 01). At a concentration of 500 μg / ml AP, the cytotoxicity index was only 14.98 ± 3.29 (P <0.01) due to a large amount of PAM shedding and death. Prompted airborne dust has the effect of reducing anti-tumor immunity of lung macrophages.