神经生长因子促进烫伤创面释放内源性生长因子

Nerve growth factor promotes endogenous growth factor releasing from burn wounds

背景:研究证实神经生长因子促进创面组织释放内源性各类生长因子及生长因子受体,起到正性调节作用,促进修复细胞增殖,加速创面愈合,使创面愈合由以往的被动等待自愈发展到主动调控愈合。目的:观察局部应用神经生长因子对大鼠烫伤创面转化生长因子β1和碱性成纤维细胞因子表达的影响。方法:取24只成年SD大鼠,于背部制成深Ⅱ度烫伤创面,随机分为4组,烧伤创面清创后,分别予以两层浸湿有1,2.5,5mg/L神经生长因子溶液及等渗盐水纱布覆盖。治疗后3,5,9,14d观察创面愈合时间和创面残留率,切取创面组织进行组织学观察,检测创面转化生长因子β1,碱性成纤维细胞因子的表达及细胞DNA周期的变化。结果与结论:各治疗组创面愈合时间较对照组提前,尤以5mg/L神经生长因子治疗组最为明显(P<0.01),各治疗组创面残留率较对照组明显减小;创面组织学显示治疗组真皮浅层有核细胞数较对照组明显增多;各治疗组给药时间点转化生长因子β1,碱性成纤维细胞因子表达均强于对照组,第5天和第9天表达强于第3天和第14天;各治疗组细胞在S期的百分比较对照组明显增加,其中5mg/L神经生长因子组增加最为显著(P<0.01)。结果显示局部应用神经生长因子可通过促进创面转化生长因子β1及碱性成纤维细胞因子表达,刺激细胞有丝分裂,促使细胞增殖,加速大鼠烫伤创面愈合。

METHODS： Twenty-four adult Sprague Dawley rats were used in the study, and II degree deep burn wound was made on the back of rats. Then, these rats were randomly divided into four groups. After burn wound debridement, the wounds were covered with gauzes containing 1, 2.5 and 5 pg/mL nerve growth factor solution and normal saline respectively. At 3, 5, 9 and 14 days after treatment, the wound healing time and percentage of residual wound were observed. Then, wound tissues were cut for histological examination, in order to detect the expressions of transforming growth factor 61 and basic fibroblast growth factor in wounds, as well as the cellular DNA cycle. RESULTS AND CONCLUSION： The wound healing time in the treatment groups was shorter than that in the control group, especially in 5 ug/mL nerve growth factor treatment group （P 〈 0.01 ）, and the percentage of residual wound in the treatment groups was less than that in the control group. The histological examination showed the number of nucleated cells in the superficial dermis of the treatment groups was significant increasedwhen compared with that in the control group; the expressions of transforming growth factor ~1 and basic fibroblast growth factor in the treatment groups at different time points were stronger than those in the control group, and the expressions at 5 and 9 days were stronger than those at 3 and 14 days; percentage of cells in S phase of the treatment groups was significantly increased, especially in 5 mg/L nerve growth factor group （P 〈 0.01）. The results indicate that local application of nerve growth factor can accelerate wound healing by increasing the expressions of transforming clrowth factor 61 and basic fibroblast orowth factor..qtimHlatinn mitn.~i~ ~n^l nrnmnfinn nrnlif^r~finn