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A novel model of wound healing in the SCID mouse using a cultured human skin substitute.

Studies of skin graft behaviour in rodent excisional wound models are limited by the dominance of wound contracture and graft sloughing as primary healing responses. To slow skin contraction, polytetrafluoroethylene (Teflon) rings were inserted into dorso-lateral full-thickness wounds in SCID mice. Cultured skin substitutes (OrCel), composed of cultured human keratinocytes and fibroblasts in a bovine collagen sponge, were implanted within the rings. Examination and histology of grafts 14 days later showed graft take in four of six recipients, with 90% epithelialization and wound contraction of 31-47%. Immunohistochemical studies, using human-specific antisera to distinguish graft from host tissues, showed that regenerated tissue was predominantly human. Staining with anticytokeratin, revealed a multilayered, stratified neoepidermis. HBG were identified in keratinocytes in all epidermal layers. Langerhans cells were absent. Antihuman vimentin, used as a fibroblast marker, confirmed that cells of the neodermis were primarily of human origin. Neoepidermal keratinocytes, primarily in the basal and suprabasal layers, were also stained. Results suggest that the poly(tetrafluoroethylene) ring inhibited graft sloughing and provided a more favourable environment for the skin substitute to regenerate a substantially normal human skin.

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Expression of cyclooxygenase-2 in choroidal neovascular membranes from age-related macular degeneration patients.

The objective of this study was to investigate the expression of cyclooxygenase (COX)-2 in human choroidal neovascular membranes.

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Adipogenesis induced by human adipose tissue-derived stem cells.

Adipose tissue-derived stem cells (ASCs), including preadipocytes, may play an important role in de novo adipogenesis and are expected to be a useful external source of cells for adipose tissue engineering. In this study, we examined in vivo adipogenesis up to 24 weeks after implantation, induced by human ASCs that were isolated from adipose tissues and expanded in vitro. ASCs proliferated in vitro in the presence of basic fibroblast growth factor (bFGF), and the number of cells increased by more than 1000-fold at the fourth passage. The ability to differentiate into mature adipocytes was maintained up to the third passage. We incorporated designated numbers of third-passage-expanded cells into a type I collagen scaffold and implanted them into the back of nude mice with or without controlled-release bFGF. After the implantation of 2 x 10(6) ASCs with controlled-release bFGF, the greatest cross-sectional surface area of adipose tissue in the scaffold was 1.19 mm(2) at 12 weeks and 2.14 mm(2) at 24 weeks. About 2 x 10(6) ASCs with controlled-release bFGF was the best condition for total adipogenesis. Immunohistochemical analysis with antihuman vimentin antibody showed that the area of human-origin adipose tissue was maximum in the group with 8 x 10(6) ASCs incorporated in a scaffold at both 12 and 24 weeks. The amount of human-origin adipose tissue increased in all groups with implanted ASCs from 12 to 24 weeks. Only trace of human-origin adipose tissue was observed in other groups implanted ASCs. Our results show that human ASCs not only function as progenitor cells for in vivo adipogenesis, but also induce de novo adipogenesis for long period.

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