大鼠成纤维细胞生长因子及相关基因的表达与鼠龄关系的初步研究
本文选题:成纤维细胞生长因子 切入点:牵引成骨 出处:《中南大学》2009年硕士论文
【摘要】: 目的: 通过对不同鼠龄大鼠在同样条件下牵引成骨效果的比较,研究成纤维细胞生长因子及相关基因在成骨局部的表达水平与年龄的关系,及其在大鼠胫骨牵引成骨过程中对新骨形成的影响。 方法: 鼠龄分别为3个月和12个月的健康雄性SD大鼠各10只,分为青年组(n=10)和老年组(n=10)。所有大鼠接受左胫骨中上段低能截骨,安置自制微型体外延长固定架。术后第二天起开始每天进行胫骨延长,速率为0.2mm/次,2次/天,共14天。术后第15天,处死大鼠,采集胫骨标本,分别进行影像学及组织学检查和RT-PCR (Reverse Transcription-Polymerase Chain Reaction)检测,以测定胫骨延长段骨痂中新生骨量及成纤维细胞生长因子及相关基因的表达。所有数据采用t检验,进行统计学处理。 结果: (1)青年组大鼠骨牵引区有大量骨痂,新生成骨面积和新生骨密度均显著高于老年组大鼠; (2)成纤维细胞生长因子及相关基因在老年组大鼠的表达水平明显低于青年组。 结论: 老年大鼠骨形成障碍可能与局部生长因子表达降低,从而导致成骨细胞功能低下密切相关。
[Abstract]:Objective:. By comparing the effects of distraction osteogenesis of rats of different ages under the same conditions, the relationship between the expression level of fibroblast growth factor and related genes in osteoblasts was studied. And its effect on the formation of new bone during distraction osteogenesis of rat tibia. Methods:. Ten male Sprague-Dawley rats aged 3 months and 12 months old were divided into two groups: the young group (n = 10) and the old group (n = 10). All the rats received a left middle and upper tibia osteotomy. From the second day after operation, the tibia was lengthened daily at the rate of 0.2mm/ twice a day for 14 days. On the 15th day after operation, the rats were sacrificed and the tibia specimens were collected. Imaging and histological examination and RT-PCR reverse Transcription-Polymerase Chain reaction were performed to determine the amount of new bone and the expression of fibroblast growth factor and related genes in callus of tibial lengthened segment. Results:. 1) there was a large amount of callus in the bone traction area of the young rats, and the area of new osteogenesis and the bone mineral density of the young rats were significantly higher than those of the elderly rats. (2) the expression of fibroblast growth factor and related genes in the aged group was significantly lower than that in the young group. Conclusion:. The dysfunction of bone formation in aged rats may be related to the decreased expression of local growth factor, which leads to the low function of osteoblasts.
【学位授予单位】:中南大学
【学位级别】:硕士
【学位授予年份】:2009
【分类号】:R363
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