肌腱愈合过程中转化生长因子β1基因表达的变化

背景：近年来，生长因子在肌腱愈合与粘连形成中的作用受到关注，其中转化生长因子与组织粘连与瘢痕形成的关系更倍受重视。 目的：观察兔屈趾肌腱Ⅱ区伤口愈合过程中转化生长因子β1基因表达的变化。 设计：随机对照动物实验。 单位：青岛大学医学院附属医院骨科。 材料：选用清洁级成年新西兰大白兔60只，体质量4．0～4．5kg，雌雄不拘，由青岛市实验动物中心提供。所有动物的左前肢作为实验侧，同一动物右前肢作为对照侧。按术后1，7，14，21，28和56d6个时间点进行观察，每个时间点10只。其中6只进行原位杂交实验，4只进行免疫组织化学染色。实验过程中对动物的处置均符合动物伦理学标准。 方法：实验于2005—09/2006—07在青岛大学医学院附属医院动物实验中心完成。麻醉后将所有动物左前中趾Ⅱ区屈趾深肌腱切断并用使用标准Kessler缝合法修复，对照侧不进行干预。分别于术后1，7，14，21，28和56d麻醉后处死动物，实验侧沿原切口切开皮肤，切取肌腱与腱鞘。对照侧采取相同措施。 主要观察指标：将肌腱与腱鞘组织进行原位杂交和免疫组织化学染色，观察转化生长因子β1的表达情况。 结果：纳入的60只动物全部进入结果分析。①原位杂交结果：实验侧肌腱损伤后1d，转化生长因子β1 mRNA的表达明显升高，在肌腱损伤后的14～21d，转化生长因子β1 mRNA的表达持续升高达到最高峰，28d开始下降，56d时仍保持较高水平。修复部位周围的腱鞘组织转化生长因子β1 mRNA的表达水平更高，在相同时间点，腱鞘细胞内的转化生长因子β1 mRNA的表达均高于肌腱组织。对照侧肌腱组织和腱鞘内均存在着转化生长因子β1 mRNA的表达，但是水平较低。实验侧各时间点腱鞘与肌腱细胞转化生长因子β1 mRNA的表达明显高于对照组，差异有显?

Gene expression of transforming growth factor beta-1 in tendon healing

BACKGROUND： We have paid more attention on the effects of growth factors on tendon healing and adhesion formation, especially on the correlation of transforming growth factor with tissue adhesion and scar formation.
OBJECTIVE： To investigate the expression of transforming growth factor beta-1 mRNA in the zone Ⅱ flexor tendon of wound-healing rabbit models.
DESIGN： Randomized controlled animal study.
SETTING： Department of Orthopaedics, Affiliated Hospital of Medical College, Qingdao University.
MATERIALS： Sixty clean adult New Zealand white rabbits weighting 4.0-4.5 kg, of either sex, were provided by Qingdao Animal Experimental Center. Left forelimbs of each animal were as experimental side, and right forelimbs of each animal were as control. There were 6 time points, namely at days 1, 7, 14, 21, 28 and 56, 10 rabbits in each time point. Of the 10 rabbits, 6 rabbits received the in situ hybridization and 4 rabbits received the immunohistochemical staining. Animal intervention met the animal ethical standard.
METHODS： Experiments were performed at the Animal Experimental Center of Hospital Affiliated to Medical College of Qingdao University from September 2005 to July 2006. After anesthesia, each rabbit underwent complete transection of the profundus middle flexor tendon in zone II, and then the tendon was repaired by the Kessler method. Rabbits in the control group did not receive any intervention. Rabbits were anesthetized and killed 1, 7, 14, 21, 28 and 56 days after the surgery. Skin was incised along the original incision at the experimental sides to obtain tendons and tendon sheaths. The same measurements were performed in the control group.
MAIN OUTCOME MEASURES： Tenocytes and tendon sheath cells were detected with the in situ hybridization and the immunohistochemical staining to observe the expression of transforming growth factor beta-1.
RESULTS： Sixty rabbits were involved in the result analysis. ①The in situ hybridization results： Expression of transforming growth fa