Objective: To investigate the application value of acellular dermal matrix (ADM) loaded collagen binding domain-vascular endothelial growth factor (CBD-VEGF) patch in the repair of urethral wound in beagles. Methods: Twenty-one healthy adult beagles were selected to establish urethral wound model and randomly divided into 3 groups, which were treated with different repair methods. CBD-VEGF patch was prepared and instantaneous implantation was performed as the models were successfully built. The blank control group was treated without any repair materials;the ADM group was treated with collagen patch for repair and the ADM loaded with CBD-VEGF group was treated with collagen patch loaded with VEGF for repair. The safety and effectiveness of the three groups of materials implanted into the urethral wound model at 6 months after surgery were compared. Urodynamic examination, urethral angiography and pathological examination were used to evaluate the recovery of urethral tissue in the three groups. Result: Compared with blank control group and ADM patch group, there was no complications or other adverse conditions in the ADM-loaded CBD-VEGF patch group. Urethrography was performed to measure the diameter of the urethra in the experimental segment, the mean urethral diameter of blank control group [(3.07±0.43) mm] was significantly smaller than that of ADM patch group [(3.73±0.11) mm] and ADM loaded CBD-VEGF patch group [(3.64±0.32) mm], with statistical difference (P<0.05). Pathological examination with HE and Masson staining showed more proliferative blood vessels in the ADM loaded CBD-VEGF patch group. HE staining indicated that there were more proliferative vessels in the group of CBD-VEGF patch loaded with ADM. Masson staining showed that the positive area percentage of collagen tissue in the three groups was 34.27%±7.40%, 29.08%±3.79% and 28.02%±2.39%, respectively, with no statistical difference between the three groups(all P>0.05). There was no excessive deposition of collagen tissue in the two groups using collagen patch. The percentage of positive staining per unit area in the three groups were 1.4%±0.1%,1.8%±0.1%3.1%±0.2%, respectively, and the difference was statistically significant among three groups and between every two groups (all P<0.01), indicating the vascular density of CBD-VEGF group loaded with ADM was the highest. Conclusion: ADM loaded CBD-VEGF patch is a good biological support material for covering the wound after urethral surgery, and it provides an alternative direction for promoting the healing of the urethral wound.
目的： 本研究探讨脱细胞真皮基质（ADM）负载胶原蛋白结合域-血管内皮生长因子（CBD-VEGF）补片在辅助比格犬尿道伤口修复中的应用价值。 方法： 选用21只健康成年比格犬，建立尿道伤口模型，随机分为3组，分别采用不同的修复方法。CBD-VEGF补片于模型构建成功时植入。其中，空白对照组不使用修复材料；ADM组使用胶原蛋白补片覆盖修复；ADM负载CBD-VEGF补片组使用加载VEGF的胶原蛋白补片覆盖修复。术后6个月，比较3组材料植入尿道伤口模型的安全性和有效性。采用尿动力学检查、尿道血管造影和组织病理学检查评估3组尿道组织恢复情况。 结果： 与空白对照组和ADM补片组相比，ADM负载CBD-VEGF补片组未出现相关并发症或其他不良情况。尿道造影测量实验段尿道直径，空白对照组［（3.07±0.43）mm］小于ADM补片组［（3.73±0.11）mm］和ADM负载CBD-VEGF补片组［（3.64±0.32）mm］（均P<0.05）。组织病理学检查HE染色显示ADM负载CBD-VEGF补片组可见较多增生血管。Masson染色显示3组胶原组织阳性面积百分比分别为34.27%±7.40%、29.08%±3.79%和28.02%±2.39%，组间差异无统计学意义（P>0.05）。使用抗vWF抗体染色显示增生的血管，3组单位面积阳染百分比分别为1.4%±0.1%，1.8%±0.1%和3.1%±0.2%，组间差异均有统计学意义（均P<0.01）。 结论： ADM负载CBD-VEGF补片是一种良好的用于比格犬尿道手术术后覆盖伤口的生物支撑材料，为促进尿道伤口愈合提供一种可选择的方向。.