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• W2007183036 abstract "This study addresses the development of an animal model for human giant congenital nevomelanocytic nevi (GCNN). Skin grafts were made from 1) non-involved split-thickness skin from a 12-month-old GCNN patient, 2) nevus split-thickness skin from the same GCNN patient, 3) nevus full-thickness skin, and 4) cadaveric human split-thickness skin. For groups 1) and 2), human epidermal and dermal cells were enzymatically isolated and expanded in tissue culture. Composite grafts were made by placing the cultured dermal cells into a collagen-glycosaminoglycan (GAG) matrix, followed by placement of the epidermal cells onto the opposite, laminated side of the matrix. All grafts were placed onto full-thickness wounds of athymic mice and biopsies were obtained from 6 to 38 weeks later for light microscopy including S-100 immunoperoxidase staining, and electron microscopy. The GCNN cultured skin mice (group 2) developed black, raised skin in the healed wounds. None of the group 1 mice developed lesions, grossly or histologically. All of the nevus full-thickness mice retained the nevus grossly. Histopathologic examination at 38 weeks of the black, raised plaques of group 2 demonstrated a reconstituted dermis similar to group 3. Nevus cells were larger and more epithelioid in the upper dermis, as seen with true GCNN. These nevomelanocytes were not seen in the dermis at 24 weeks, suggesting that the nevus cells migrated from the epidermal component of the cultured graft to the dermis during this time frame (24-38 weeks). The melanocyte identity of these cells was confirmed with S-100 immunoperoxidase staining and electron microscopy. These findings are unique to this composite cultured graft system. The ability to culture specific types of melanocytes and place them int skin substitutes on athymic mice provides a basis for the study of GCNN and melanocyte biology in vivo." @default.
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• W2007183036 date "1991-10-01" @default.
• W2007183036 modified "2023-10-15" @default.
• W2007183036 title "Reconstitution of the Histologic Characteristics of a Giant Congenital Nevomelanocytic Nevus Employing the Athymic Mouse and a Cultured Skin Substitute" @default.
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• W2007183036 doi "https://doi.org/10.1111/1523-1747.ep12483707" @default.
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