Abstract
This study was designed to determine the ability of human umbilical vein endothelial cells (HUVEC) in dermal equivalent (DE) to form microvessel-like tubes after transplantation into normal rats. A mixture of rat fibroblasts and HUVEC was inosculated into collagen-chitosan sponges to prepare endothelialized dermal equivalents (EDE). After culture in vitro for 24 hours, inosculated cells dispersed throughout the sponges and the equivalents were transplanted subcutaneously into the back of normal Lewis rats. Anti-human specific CD31 antibody was used for immunohistochemical localization of human endothelial cells in sections of EDE excised from rats after grafting. HUVEC in EDE organized into microvessel-like tubes at the end of the first week after transplantation, which still persisted after two weeks. The host microvessels began to pervade both DE and EDE during the second week after transplantation. These results demonstrated that HUVEC in EDE was able to persist and form microvessel-like tubes after transplantation into normal rats, and this is the first time to transplant DE containing HUVEC into normal rats.
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