摘要目的:探究牙龈卟啉单胞菌( Porphyromonas gingivalis, P． gingivalis)菌体表面菌毛素(fimbrillin, FimA)在 P. gingivalis促进食管鳞癌(esophageal squamous cell carcinoma, ESCC)进展过程中的作用。 方法:野生型 P. gingivalis与 fimA基因缺失型 P. gingivalis( fimA-/-P. gingivalis)经形态学和PCR鉴定后感染ESCC细胞，免疫荧光、CCK-8、Transwell小室检测 fimA-/-对 P. gingivalis侵入细胞、增殖、迁移和侵袭能力影响，Western blot检测pSmad2/3变化，裸鼠皮下成瘤检测荷瘤生长。 结果:fimA-/-P． gingivalis与野生型 P. gingivalis比较，FimA缺失可能降低菌体间黏附， fimA-/-P. gingivalis侵入NE6-T细胞内细菌数目减少，刺激NE6-T和KYSE30细胞增殖、迁移和侵袭能力降低，pSmad2/3激活降低， fimA-/-P. gingivalis感染的KYSE30在裸鼠皮下生长较野生型 P. gingivalis明显降低。 结论:FimA介导了 P. gingivalis促进ESCC演进的作用，是阻断 P. gingivalis促肿瘤作用的潜在靶点分子。

abstractsObjective:To investigate the effects of Porphyromonas gingivalis ( P. gingivalis) fimbrillin (FimA) on the progression of esophageal squamous cell carcinoma (ESCC). Methods:Wild-type P. gingivalis and fimA gene-deleted P. gingivalis ( fimA-/-P. gingivalis) were used to infect ESCC cells after morphology and PCR identification. Immunofluorescence, CCK-8 and Transwell chamber were used to detect the effects of FimA on the infectivity of P. gingivalis and it influences on cell invasion, proliferation and migration. Western blot was used to detect pSmad2/3 changes. The growth of tumor was detected in a nude mouse model bearing subcutaneous tumor. Results:Deletion of FimA might reduce the interbacterial adhesion of P. gingivalis. Compared with wild-type P. gingivalis, less fimA-/-P. gingivalis could infect NE6-T cells. Moreover, the proliferation, migration and invasion of NE6-T and KYSE30 cells as well as the activation of pSmad2/3 induced by P. gingivalis were inhibited after deletion of FimA. The growth of KYSE30 infected by fimA-/-P. gingivalis in nude mice was significantly slower than that of the wild-type P. gingivalis group. Conclusions:FimA mediated the effects of P. gingivalis on promoting the evolution of ESCC and was a potential target molecule to block the tumor-promoting effect of P. gingivalis.