RESUMO
OBJECTIVE: To observe the protein expression of ferritin light chain(FTL) in alveolar macrophages(AM) of patients with occupational silicosis(hereinafter referred to as silicosis). METHODS: The male patients with silicosis at stage Ⅰ, Ⅱ, and Ⅲ were separately selected as the silicosis groupⅠ, Ⅱ, and Ⅲ using judgment sampling method, with 15 patients in each group. Meanwhile, 15 male silicon dust workers with small lung shadows but not diagnosed as silicosis were selected as the control group. Bronchoalveolar lavage fluid was collected from the four groups, and AM was separated and purified, and protein was extracted after lysis of the AM. Western blotting was used to detect the relative expression of FTL protein in the AM. RESULTS: The relative expression of FTL protein in AM of silicosis groupⅠ, Ⅱ, and Ⅲ was lower than that in the control group(all P<0.05). The relative expression of FTL protein in AM decreased with the increase of silicosis stage(P<0.05).CONCLUSION: The expression of FTL protein in AM was down-regulated in patients with silicosis in a dose-response manner. It is speculated that FTL may have a negative regulatory effect in the progress of silicosis fibrosis.