[Sheep acellular dermal matrix microparticle transplant for wound in rats]

To explore the healing effect on wound after transplanting sheep acellular dermal matrix (ADM) microparticle together with autoallergic skin microparticle.
 Methods: The rats were divided into three groups. Full-thickness skin wound at size about 4.0 cm×4.0 cm was generated on the back of every rat. Group A, the sheep ADM microparticle and autoallergic skin microparticle were mixed according to the ratio of 5:1, coating on wound of rat back. Group B, the sheep ADM microparticle and autoallergic skin microparticle were mixed according to the ratio of 2:1. Group C, autoallergic skin microparticle was only put on wound and be covered with heterograft. We observed the development of wound healing and compared the wound contraction rate among the three groups.
 Results: Three groups displayed same speed on extending of autoallergic skin microparticle and wound healing. The skin microparticles in Group A were wrapped up by around tissues and fused each other. A few renewal blood vessels were found in tissues, and ADM was replaced by around tissues and mixed with autoallergic skin microparticle. At the muscle surface, a few derma tissues distributed into point or patch, and the wound contraction rate was the lowest one among the 3 groups. The skin microparticles in Group B were mixed with more sheep ADMs than those in Group A. Some ADMs were wrapped by around tissues but could not been absorbed. Sheep ADM microparticles were free from around tissues, and the wound healing was delayed. The wound contraction rate in Group B was higher than that in Group A. The wound healing in Group C was faster than that in Group B, but there were few derma tissues under the skin. The wound contraction rate was the highest one.
 Conclusion: Mixing sheep ADM microparticle with autoallergic skin microparticle according to the ratio of 5:1 is good for regenerating derma tissues, and it can improve healing effect of wound.