To investigate the effectiveness of adipose tissue-derived stem cells sheet combined with atelocollagen matrix on a mouse model of radiation-induced skin injury, adipose tissue-derived stem cells were harvested from the bilateral groin of mice and were screened out by fluorescence-activated cell sorting. Cell sheets were created on a temperature-responsive cell culture surface. The wound recovery rate was detected by measuring the injury area and the recovery shapes of wound were monitored by hematoxylin–eosin, Masson’s trichrome, and immunohistochemical staining. Quantitative reverse transcription polymerase chain reaction and Western blot analysis were conducted to detect relative mRNA expression level of interleukin-1β and protein expression level of vascular endothelial growth factor, respectively. As results, the three-layer adipose tissue-derived stem cells sheet combined with atelocollagen matrix treatment promoted wound healing significantly compared to other treatments. More collagen, higher vessel density, and milder inflammation were observed in the group of three-layer adipose tissue-derived stem cells sheet combined with atelocollagen matrix compared with other treatments. Moreover, both mRNA expression level of interleukin-1β and protein expression level of vascular endothelial growth factor were drastically decreased in that group. In conclusion, three-layer adipose tissue-derived stem cells sheet combined with atelocollagen matrix could promote wound healing synergistically, providing a substantial advance in cell-based tissue engineering and wound healing.
Background and Objectives: The keystone design perforator island flap (KDPIF) is often used to cover defects in reliable blood supply and similar skin patterns, but its mobility is limited, especially when the wound is large or occurs around joints. Here, we describe a modified KDPIF, boat-shaped flap. We added a V shape along the lateral arc, forming a V-Y flap on KDPIF's outer arc shapes like a sail. This paper also describes a clinical study to evaluate this method.Method: From September 2014 to March 2017, 31 patients were operated on using the boat-shaped flap in our department and were followed up annually with clinical evaluation. The wound locations included joints (n = 11), trunk (n = 18), and face (n = 2). Fifteen defects were ≥5 × 5 cm 2 .Results: After 6 to 24 months of follow-up, 29 patients had first-intention healing and were satisfied with the morphology and function. Secondary healing was observed in two patients, and the wounds were closed after dressing treatment for 2 weeks. Conclusion:The boat-shaped flap enhances the mobility and achieves strong resistance to tension. The modified curvilinear shape prevents the joint activity from being restricted, with visually concealed scars. It is particularly applicable for repairing large wounds and defects around joints. K E Y W O R D Sjoints, keystone design perforator island flap, mobility, repair, tension
Objective: Decellularized adipose-derived matrix (DAM) can promote adipogenic differentiation and adipose tissue remodeling, but the biological impact of tissue origin on DAM remains unknown. The present study aimed to investigate the effects of tissue origins on the adipogenic capacity of the decellularized matrix by comparing the cellular and tissue responses of DAM versus acellular dermal matrix (ADM).Methods: The in vitro response of adipose-derived stem/stromal cells (ADSCs) to DAM and ADM was characterized by proliferation and differentiation. The in vivo remodeling response was evaluated in the subcutaneous injection model of immunocompromised mice, using histology, protein expression, and transcriptome analysis.Results: Both DAM and ADM exhibited excellent decellularization effects and cytocompatibility. In the absence of exogenous stimuli, DAM could induce adipogenic differentiation of ADSCs compared with ADM. In the animal model, the levels of PDGF, VEGF, and ACRP30 were higher in the DAM groups than in the ADM group, and more neovascularization and extensive adipose tissue remodeling were observed. The mRNA-seq analysis indicated that the DAM implant regulated tissue remodeling by modulating Lat1/2 expression along with Hippo Signaling pathway in the early stage.Conclusion: Tissue origin can influence the biological response of the decellularized matrix. DAM can retain favorable tissue-specific characteristics after the decellularization process and have unique adipogenic effects in vitro and vivo, which can be fully utilized for soft tissue repair and regeneration.
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