肥厚腰椎黄韧带中成纤维细胞生长因子、转化生长因子及结缔组织生长因子的表达

摘要

背景：腰椎黄韧带肥厚是临床上引起腰椎管狭窄的主要因素之一，但其分子机制仍不是非常清楚。目的：分析纤维化相关细胞因子碱性成纤维细胞生长因子、转化生长因子β1和结缔组织生长因子在腰椎黄韧带肥厚过程中的作用。方法：取临床手术所取黄韧带，对照组6例(椎管内占位且无腰椎不稳患者黄韧带)、突出组(单纯腰椎间盘突出症患者黄韧带)6例、腰椎管狭窄症组6例。采用实时定量RT-PCR的方法检测各组黄韧带中碱性成纤维细胞生长因子、转化生长因子β1、结缔组织生长因子及Ⅰ、Ⅲ、Ⅴ型胶原蛋白的mRNA含量，分析3个细胞因子在黄韧带肥厚过程中的作用。结果与结论：腰椎管狭窄症组碱性成纤维细胞生长因子mRNA表达均明显高于突出组和对照组(均P <0.05)；腰椎管狭窄症组转化生长因子β1mRNA在3组中的表达明显高于对照组和突出组(均P <0.01)；结缔组织生长因子 mRNA 3组间差异无显著性意义(P >0.05)。腰椎管狭窄症组Ⅰ型胶原蛋白mRNA表达明显高于突出组和对照组(均P <0.05)；Ⅲ型胶原蛋白、Ⅴ型胶原蛋白mRNA表达3组之间差异无显著性意义(P >0.05)。结果说明碱性成纤维细胞生长因子、转化生长因子β1在腰椎黄韧带肥厚形成过程中有重要作用，引起黄韧带肥厚的主要胶原产物为Ⅰ型胶原蛋白。%BACKGROUND:Ligamentum flavum hypertrophy is one of the most important factors of lumbar spinal stenosis, but the molecular mechanism is stil not very clear. OBJECTIVE:To explore the role of basic fibroblast growth factor, connective tissue growth factor and transforming growth factor β1 in hypertrophy of the lumbar ligamentum flavum. METHODS: The ligamentum flavum samples were divided into three groups according to different diseases: control group (acquired from the patients with lumbar spinal canal tumor,n=6), lumbar disc herniation (LDH) group (acquired from the patients with LDH,n=6) and lumbar spinal stenosis (LSS) group (acquired from the patients with LSS,n=6). Then the mRNA expressions of basic fibroblast growth factor, connective tissue growth factor, transforming growth factor β1 and colagen I, III, V of the ligamentum flavum were detected using real-time quantitative RT-PCR method. The roles of basic fibroblast growth factor, connective tissue growth factor and transforming growth factor β1 were explored. RESULTS AND CONCLUSION:The expression of basic fibroblast growth factor mRNA in the LSS group was significantly higher than that in the LDH and control groups (bothP < 0.05); the expression of connective tissue growth factor mRNA was not found statisticaly different among the three groups, although it was slightly higher in the LSS group (P> 0.05); the expression of transforming growth factor β1 mRNA was significantly higher in the LSS group than in the LDH and control groups (bothP < 0.01). The colagen I mRNA expressed significantly higher in the LSS group than the LDH and control groups (bothP < 0.05), but both the colagen III and V mRNA showed no significant difference among the three groups (P> 0.05). This study indicate that both basic fibroblast growth factor and transforming growth factor β1 play important roles in the formation process of the lumbar ligamentum flavum hypertrophy, and the main type of the colagen in the hypertrophied ligamentum flavum is colagen I.