# Efficacy and Safety of Cell-Assisted Acellular Adipose Matrix Transfer for Volume Retention and Regeneration Compared to Hyaluronic Acid Filler Injection

## TL;DR

This study compares a new cell-assisted fat matrix technique with hyaluronic acid fillers for tissue volume and regeneration, finding the new method to be safe and effective.

## Contribution

The study introduces and evaluates cell-assisted acellular adipose matrix transfer as a novel alternative to hyaluronic acid fillers.

## Key findings

- Cell-assisted AAM transfer showed better adipogenesis and collagen formation than hyaluronic acid fillers.
- CAT demonstrated superior angiogenesis and gene expression, with improved biocompatibility.
- CAT maintained similar volume to HA fillers while showing enhanced tissue regeneration.

## Abstract

Cell-assisted acellular adipose matrix (AAM) transfer is a novel technique for soft tissue volume restoration, where AAM acts as a scaffold for tissue proliferation and promotes host cell migration, vascularization, and adipogenesis. This study aimed to evaluate the efficacy and safety of in vivo cell-assisted AAM transfer compared to hyaluronic acid (HA) filler injection.

Human adipose tissue was used to manufacture AAM, and murine adipose-derived stem cells (ASCs) were prepared. Nude mice were divided into four groups: AAM transfer (AT), ASC-assisted AAM transfer (CAT), HA filler injection (HI), and ASC-assisted HA filler injection (CHI). Eight weeks post-transfer, in vivo graft volume/weight, histology, and gene expression were analyzed to assess efficacy and safety.

The AAM retained its three-dimensional scaffold structure without cellular components. AT/CAT showed lower volume retention than HA/CHA; however, CAT maintained a similar volume to HA. Histologically, adipogenesis and collagen formation were increased in AT/CAT compared to HA/CHA, with CAT showing the highest levels. CAT also demonstrated superior angiogenesis, adipogenesis, and gene expression (Vegf and Pparg), along with lower Il-6 expression, higher Il-10 expression, and reduced capsule formation, indicating better biocompatibility.

Cell-assisted AAM transfer is a promising technique for volume retention and tissue regeneration, offering a safe and effective alternative to HA filler injections.

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The online version contains supplementary material available at 10.1007/s00266-024-04408-0.