目的观察不同fimA基因型牙龈卟啉单胞菌(Porphyrorrtonaz gingivalis,Pg)对人牙龈成纤维细胞基质金属蛋白酶(matrix metalloproteinases,MMP)表达水平的影响,探讨fimA基因型与如致病力之间的关系。方法PgATCC33277(I型)、WCSP115(Ⅱ型)、WCSP1.5(Ⅲ型)、W83(Ⅳ型)分别与牙龈成纤维细胞在标准条件下共同孵育(对照组为达尔伯克氏改良伊格尔培养基),于孵育后1、3、6和12h收集细胞和培养上清液,应用实时荧光定量反转录聚合酶链反应(RT—PCR)和ELISA法分别检测牙龈成纤维细胞MMP-1、MMP-2的mRNA及蛋白的动态表达。结果与对照组相比,聘刺激下牙龈成纤维细胞MMP-1、MMP-2的mRNA和蛋白水平表达量均明显上调(P〈0.01);其中Ⅱ型fimA型Pg的刺激作用强于其他各型,不同时间点MMP-1mRNA相对表达量及蛋白分泌水平分别为(28.88±3.12)-(231.01±24.99)、(1.35±0.17)-(3.084-1.20);MMP-2mRNA相对表达量及蛋白分泌水平分别为(20.42±2.21)~(188.34±37.37)、(2.57±0.76)~(18.08±1.15),与其他各型相比差异有统计学意义(P〈0.05);III型Pg的刺激作用较弱,不同时间点MMP-1mRNA相对表达量及蛋白分泌水平分别为[(5.11-4-0.55)~(72.84±8.84)]μg/L、[(0.68±0.13)~(1.464-0.94)]μg/L;MMP-2mRNA相对表达量及蛋白分泌水平分别为[(4.554-0.55)~(25.75±3.12)]μg/L、[(2.284-0.93)~(11.22±2.46)]μg/L,与其他各型相比差异有统计学意义(P〈0.05)。结论Pg可以诱导牙龈成纤维细胞过表达MMP,fimA基因型与堍的毒力作用相关,fimA型可能为魄致病力差异的基因基础。
Objective To investigate the mechanism of matrix metalloproteinases (MMP) regulations of human gingival fibroblasts (HGF) by challenge of Porphyromonas gingivalis (Pg) with different fimA genotypes. Methods Pg ATCC 33277 ( type Ⅰ ), WCSP115 ( type Ⅱ ), WCSP1.5 ( type Ⅲ), w83 (type Ⅳ ) were assessed for their inductions of MMP-1 and MMP-2 expression in HGK MMP mRNA levels of HGF were determined by real-time RT-PCR and MMP protein levels in culture supernatant were determined by ELISA at different time intervals (1, 3, 6 and 12 h) following continous co-culture of bacteria with HGF. Results When co-cultured with Pg, the MMP-1 and MMP-2 mRNA and protein expression of HGF significantly increased compared with the negative control group (P 〈 0. 01 ). The group of type Ⅱ showed greater up-regulated than other lima genotypes in the mRNA and protein expressions of MMP-1 and MMP-2, MMP-1 mRNA [ (28. 88 ±3. 12)-(231.01 ± 24. 99) ] and protein [ ( 1.35 -±0. 17)- (3.08 ± 1.20)] μg/L; MMP-2 mRNA [(20.42 4, 2. 21)-(188.34 ± 37. 37)] and protein [ (2. 57 ±0. 76) -( 18.08 _± 1.15) ] μg/L for different time periods; While the group of type HI was weaker than other fimA genotypes, the level of MMP-1 mRNA was [ (5. 11 ±0. 55)-(72. 84 ±8.84) ] and protein [ (0. 68 ± 0. 13) -( 1.46 ± 0. 94 ) ] μg/L, MMP-2 mRNA [ (4. 55 ± 0.55 ) -( 25. 75 ± 3.12 ) ] and protein [ (2. 28 ± 0. 93 ) - ( 11.22 ± 2.46) ]μg/L ( P 〈 0. 05 ). Conclusions Pg could induce HGF to over-express MMP, and fimA genotypes of Pg may be related to this pathogenicity, which might indicate fimA genotype is associated with pathogenesis of Pg.