As an important component of the skin, intradermal adipocytes are closely associated with skin homeostasis and wound healing. Although studies have focused on the role of fibroblasts, keratinocytes, and inflammatory cells in wound healing, the role of adipocytes has not been fully investigated. Here, we verified whether the induction of adipocyte regeneration in a wound bed can effectively promote wound healing, finding that the hydrogel from acellular porcine adipose tissue (HAPA) in combination with adipose-derived stem cells (ADSCs)can induce in situ adipogenesis in the wound microenvironment. The newly regenerated adipocytes enhanced fibroblast migration, accelerated wound closing, and enhanced wound epithelialization. More importantly, newly formed, intact skin structure was observed after treating the wound with ADSCs-loaded HAPA. These results demonstrated that HAPA might substantially improve re-epithelialization, angiogenesis, and skin-appendage regeneration, making it a promising therapeutic biomaterial for skin-wound healing.
Abdominal wall defects are a common medical problem, and inadequate repair methods can lead to serious complications. Abdominal wall reconstruction using autologous tissue, or non-biological, biological, or composite patches is often performed to repair defective areas. In particular, composite patches containing both polymeric and biological materials have gained increasing attention due to their good mechanical properties and biocompatibility. However, it is still unclear whether the quality of repairs using composite patches is superior to that of a biological patch. Based on the limitations of previous studies, we compared small intestinal submucosa (SIS) patches with SIS + polypropylene mesh (PPM) patches for repairing abdominal wall defects in adult beagle dogs. Forty-five female dogs were subjected to surgical resection to produce abdominal wall defects. SIS or SIS + PPM was used as patch for the defects. Morphology, biomechanics, and histological evaluations were performed to evaluate the efficacy and safety of such therapies. Our findings demonstrated that SIS had advantages over SIS + PPM considering biological activity and histocompatibility without increasing the risk of repair failure.
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