碱性成纤维细胞生长因子转染对半月板纤维软骨细胞增殖、细胞周期及胶原合成影响的研究

目的探索携带碱性成纤维细胞生长因子(bas ic fibrob last grow th factor,bFGF)基因的重组慢病毒载体转染半月板纤维软骨细胞的效能,观察半月板纤维软骨细胞对bFGF基因转染的反应。方法将从1只3月龄新西兰大白兔分离培养的第1代半月板纤维软骨细胞分为实验组(A组)、对照组(B组)和空白组(C组),3组细胞分别以2×104个/孔接种于24孔培养板。细胞生长至60%融合时,A组与克隆有bFGF基因的重组慢病毒载体悬液共培养,B组与不携带任何基因的慢病毒悬液共培养,C组未接受外加处理。共培养48 h后检测3组的细胞周期、胶原合成能力、培养液中bFGF的表达及不同时间各组细胞的细胞增殖能力的变化。结果共培养48 h后在A组测出bFGF浓度为870±60 pg/m l,而B、C组培养液中未能检测出bFGF的表达;共培养6 d后,M TT法检测,A组吸光度(A)值0.427±0.037与B组0.320±0.042和C组0.308±0.034比较差异有统计学意义(P<0.01)。A组细胞周期较B、C组缩短,A组细胞G1期,S期和G2/M期的时间分别为16.28、12.60和11.04 h;而B、C组分别为23.61、16.90和21.33 h及21.56、19.80和21.41 h;A组与B、C组比较差异有统计学意义(P<0.05)。A组细胞每分衰变数(7 281.69±805.50)高于B组(5 916.40±698.11)和C组(5 883.57±922.63),比较差异有统计学意义(P<0.05)。结论借助慢病毒载体能有效实现bFGF基因在半月板纤维软骨细胞的转染;bFGF基因转染能促进半月板纤维软骨细胞的增殖和胶原合成能力。

EFFECTS OF BASIC FIBROBLAST GROWTH FACTOR GENE TRANSFECTION ON BIOCHEMISTRY OF MENISCAL FIBROCHONDROCYTES

OBJECTIVE: To explore the effects of the basic fibroblast growth factor(bFGF) gene transfection on the meniscal fibrochondrocytes with the reconstructed lentivirus and to observe the response of the meniscal fibrochondrocytes to the bFGF gene transfection. METHODS: The cultured meniscal fibrochondrocytes were isolated from the same 3-month-old New Zealand rabbit. The cultured first-generation meniscal fibrochondrocytes were divided into 3 groups:Group A (experimental group), Group B (control group), and Group C (blank group). Each group comprised the cells in a 24-hole flask in which each hole contained 2 x 10(4) cells. At the confluence of 60%, the fibrochondrocytes in Group A were cultured with the reconstructed lentivirus carrying the bFGF gene. The fibrochondrocytes in Group B were cultured with the lentivirus carrying no bFGF gene. The fibrochondrocytes in Group C were cultured without any intervention. After 48 h, the cell cycle, the collagen synthesis ability, the expression of bFGF, and the cell proliferation ability in each group were investigated. RESULTS: In Group A, the bFGF expression of 870+/-60 pg/ml was detected in the cells 48 h after the co-culture; however, in Group B and Group C, no expression of bFGF was found. After the co-culture for 6 days, the results of the MTT colorimetry revealed that the cells in Group A had an absorbtance of 0.427 +/-0.037, which had a significant difference when compared with that in Group B and Group C (0.320+/-0.042, 0.308 +/-0. 034,P<0. 01). The cell cycle was significantly shorter in Group A than in Group B and Group C (P<0. 05); The durations of G, S and G2M of the cells in Group A were 16.28, 12.60 and 11.04 h, but those in Group B and Group C were 23.61, 16.90, 21.33 h and 21.56, 19.80, 21.41 h, respectively. The disintegration per minute of the cells was significantly greater in Group A than in Group B and Group C (7 281.69+/-805.50 vs 5 916. 40+/-698. 11 and 5 883. 57 +/-922.63.P<0. 05). CONCLUSION: The lentivirus vector can transfer the bFGF gene into the meniscal fibrochondrocytes, resulting in an increase of the cell proliferation and the collagen synthesis.