Abstract
BackgroundAutologous fat grafts have been widely in use for reconstruction, contour abnormalities, and cosmetic surgeries. However, the grafted fat one-year survival rate is unpredictable and always low (20%–80%). Standardizing the existing transplantation technology is difficult due to the limiting conditions. Scaffold materials or drugs are unsuitable to employ because of legal restrictions, complex production, and undetermined hazards. Therefore, a simpler and more effective approach to improve grafted fat survival rate is using commercial products as additives. Earlier studies proved that porcine acellular dermal matrix (PADM), a biomaterial clinically used for wound repair, could work as a scaffold for lipo-implantation. This study aimed at investigating the hitherto unclear effect of PADM on transplanted fat survival.MethodsThirty-two 8-week-old female nude mice were divided into two groups. Control mice received a 300 μl fat injection, while the PADM group mice were injected with a 300 μl PADM-fat mixture. After a 4-week treatment, fat weight and liquefaction ratio were assessed. Histological changes were quantified via hematoxylin & eosin (H&E) staining. Macrophage infiltration and vascular regeneration were revealed using an anti-CD34 antibody. Mouse and human mRNA expression levels were gauged via RNA-sequencing. On the third day post implantation, the mRNA expression levels of inflammatory genes Mcp-1 and Tnf-α were measured by qRT-PCR.ResultsThe weight of surviving grafted fat did not differ between the control and the PADM group. However, adding PADM significantly decreased fat liquefaction. H&E-stained sections showed that PADM decreased fat necrosis, increased fat tissue regeneration, and raised CD34 levels in the regenerated tissue. RNA-sequencing showed that, compared to controls, fats from PADM-added group expressed more mouse-related mRNA but less human-related mRNA. The following GO and KEGG analysis showed that added PADM increased extracellular matrix (ECM) genes expression levels. The qRT-PCR showed that adding PADM increased Mcp-1 and Tnf-α mRNA expression levels.ConclusionsIn summary, PADM addition increased fat survival rate by reducing fat liquefaction through an increased macrophage infiltration, ECM regeneration, and revascularization. Therefore, PADM addition is a workable application in autologous fat grafting.No Level AssignedThis journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266.
Highlights
Autologous fat grafting is defined as the transfer of a person’s own fat from one to another body area to enhance or restore volume
Earlier studies proved that porcine acellular dermal matrix (PADM), a biomaterial clinically used for wound repair
In 2018, He et al [18] found that during full thickness cutaneous wound healing, PADM induced M2 macrophage polarization and released a series of wound healing factors, including matrix metalloproteinases (MMPs) and growth factors, which promoted cell proliferation and angiogenesis while remodeling the extracellular matrix (ECM). These findings showed that PADM could advance wound healing and tissue regeneration, the effects of PADM in fat grafting have remained unclear
Summary
Autologous fat grafting is defined as the transfer of a person’s own fat from one to another body area to enhance or restore volume. The grafted fat survival rate was unpredictable. The necrotic adipocytes may release compounds inducing inflammation and even multiple complications, such as oil cysts, hematomata, calcifications, or tissue depressions [5,6,7,8,9]. This increases the patients’ burden, and hinders the clinical application of fat grafting. The grafted fat one-year survival rate is unpredictable and always low (20%–80%). A simpler and more effective approach to improve grafted fat survival rate is using commercial products as additives. Earlier studies proved that porcine acellular dermal matrix (PADM), a biomaterial clinically used for wound repair, Aesth Plast Surg (2021) 45:2426–2436 description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266
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