凝胶型胶原敷料修复糖尿病皮肤缺损及促进血管再生

Collagen gel dressings repair diabetic skin defects and promote angiogenesis

背景:胶原已经被证实能够促进受损组织创面的修复,加速创面愈合。目的:观察凝胶型活性胶原敷料对糖尿病皮肤缺损愈合的影响,以及在促进毛细血管再生方面的作用。方法:取SD大鼠160只,其中40只为正常对照,另120只腹腔注射链脲佐菌素制作糖尿病模型。造模9周后将120只大鼠随机均分为模型组、阳性对照组、实验组,连同正常对照组在大鼠背部制作全层皮肤缺损创面,正常对照组和模型组创面外敷灭菌凡士林,实验组外敷凝胶型胶原敷料,阳性对照组外敷重组人表皮生长因子凝胶,观察各组创面愈合面积及毛细血管新生情况。结果与结论:给药第1周,除正常对照组动物愈合较快外,其余各组动物创面愈合速度差异不大;给药第2周,正常对照组愈合速度最快,阳性对照组、实验组创面未愈合面积小于模型组;给药第3周,正常对照组及实验组创面未愈合面积小于模型组和阳性对照组;给药第4周,正常对照组及阳性对照组未愈合面积小于模型组和实验组;并且实验组给药第2,3周的创面愈合效果好于阳性对照组。实验组给药第1,2,3周的毛细血管数均多于其余3组。结果表明凝胶型胶原敷料可促进糖尿病缺损创面愈合速度并提高愈合质量。

BACKGROUND： Collagen has been shown to promote the restoration of damaged tissue wound and to accelerate wound healing. OBJECTIVE： To observe the effect of collagen gel dressing on defect healing of diabetic skin and its role to promote capillary regeneration. METHODS： Forty of 160 Sprague-Dawley rats were used as normal controls, and the other 120 rats were used to make diabetic models with intraperitoneal injection of streptozotocin. After 9 weeks, 120 model rats were randomly divided into model group, positive control group and experimental group. Then full-thickness skin wounds were made on the back of all rats. The normal group and model group were externally treated with vaseline. Experimental group was externally treated with collagen gel dressing, and recombinant human epidermal growth factor gel was used in the positive control group. Finally, the healing area of wounds and newborn capillaries were observed. RESULTS AND CONCLUSION： At 1 week of administration, animals in the normal control group showed faster wound healing, but the wound healing rates in the other groups were changed insignificantly; at 2 weeks of administration, the healing rate of the normal control group was fastest, and the nonhealing area in the model group was larger than that in the positive control and experimental groups; at 3 weeks of administration, the nonhealing area of the normal control and experimental groups was smaller than that of the model and positive control groups; at 4 weeks of administration, the nonhealing area of the normal control and positive control groups was smaller than that of the model and experimental groups. In addition, wound healing was better in the experimental group than the positive control group at 2 and 3 weeks of administration; while the number of capillaries in the experimental group was more than that of the other three groups at 1, 2, 3 weeks of administration. These results suggest that collagen gel dressings can promote healing of diabetic wounds and improve healing quality.