JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Adipose Tissue-Derived Microvascular Fragments Improve Vascularization, Lymphangiogenesis, and Integration of Dermal Skin Substitutes.

Full-thickness skin defects can be covered with dermal skin substitutes in combination with split-thickness skin grafts. However, slow vascularization of the matrices bears the risk of wound infection and extends the length of hospitalization. To overcome these problems, we describe a promising vascularization strategy. Green fluorescent protein+ adipose tissue-derived microvascular fragments (ad-MVF) were isolated from epididymal fat pads of C57BL/6-Tg(CAG-EGFP)1Osb/J mice. ad-MVF were seeded on collagen-glycosaminoglycan matrices, which were implanted into full-thickness skin defects in the dorsal skinfold chamber of wild-type C57BL/6 mice. Nonseeded matrices served as controls. Vascularization, lymphangiogenesis, and integration of the implants were studied by using intravital fluorescence microscopy, histology, and immunohistochemistry over 14 days. ad-MVF rapidly reassembled into microvascular networks within the implants, which developed interconnections to the host microvasculature. Accordingly, vascularization of the implants was markedly accelerated, as indicated by a significantly higher microvessel density when compared with controls. Moreover, dense lymphatic networks originating from the green fluorescent protein+ ad-MVF developed within the implants. This was associated with an improved implant integration. Hence, seeding ad-MVF on collagen-glycosaminoglycan matrices represents a potential strategy to reduce morbidity and hospitalization of patients undergoing the treatment of full-thickness skin defects.

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