Skin graft vascularization involves precisely regulated regression and replacement of endothelial cells through both angiogenesis and vasculogenesis

Plastic and Reconstructive Surgery
Jennifer M CaplaGeoffrey C Gurtner

Abstract

Long-term survival of a skin graft is dependent on eventual revascularization. The authors' aim in the present study was to determine whether skin graft vascularization occurs by (1) simple reconnection of vessels, (2) ingrowth of recipient vasculature, (3) outgrowth of donor-derived vessels, and/or (4) recruitment of bone marrow-derived endothelial progenitor cells. Full-thickness skin grafts (1 x 1 cm) were transferred between wild-type FVB/N mice (n = 20) and transgenic tie2/lacZ mice (n = 20), where lacZ expression is controlled by the endothelial specific tie2 promoter, allowing differentiation of recipient and donor endothelial cells. The contribution of endothelial progenitor cells to skin graft neovascularization was determined using a bone marrow transplant model where tie2/lacZ bone marrow was transplanted into wild-type mice (n = 20). Vascular regression in the graft was observed at the periphery starting on day 3 and moving centrally through day 21, sparing graft vessels in the absolute center of the graft. At the same time, vascular ingrowth occurred from the wound bed to replace the regressing vessels. Furthermore, bone marrow-derived endothelial progenitor cells contributed to these new vessels starting as early ...Continue Reading

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