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Epithelial Tissues and Their Functions

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Updated: Jan 24, 2026

Minced Tissue in Compressed Collagen: A Cell-containing Biotransplant for Single-staged Reconstructive Repair
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A scaffold-free, collagen-guided self-assembling adipose construct for functional soft tissue reconstruction.

Yuchen Zhang1, Yucheng Luo1, Yuang Song1

  • 1Department of Plastic and Cosmetic Surgery, Nanfang Hospital, Southern Medical University, 1838 Guangzhou North Road, Guangzhou, Guangdong 510515, China.

Acta Biomaterialia
|January 22, 2026
PubMed
Summary

This study introduces Self-Assembly Fat (SAF), a novel scaffold-free adipose construct using collagen to improve soft-tissue repair. SAF⁺, enhanced with collagen, shows superior stability, vascularization, and regenerative capacity for better surgical outcomes.

Keywords:
CollagenExtracellular matrixRegenerationSelf-assembleTissue engineering

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Area of Science:

  • Biomaterials Engineering
  • Tissue Engineering
  • Plastic and Reconstructive Surgery

Background:

  • Autologous fat grafting for soft tissue defects often results in poor volume retention and slow vascularization.
  • Current biomaterial strategies face challenges with biocompatibility, foreign-body responses, and limited integration.
  • A need exists for improved, scaffold-free adipose constructs with enhanced regenerative potential.

Purpose of the Study:

  • To develop and characterize a collagen-guided, self-assembling adipose construct (SAF) from clinical lipoaspirate.
  • To investigate the effects of exogenous collagen supplementation (SAF⁺) on construct properties and regenerative capacity.
  • To elucidate the underlying molecular mechanisms of collagen-driven adipose tissue self-assembly and repair.

Main Methods:

  • Utilized clinical lipoaspirate to create self-assembling adipose constructs (SAF) driven by intrinsic type I collagen crosslinking.
  • Supplemented constructs with exogenous type I collagen (SAF⁺) to enhance mechanical and biological properties.
  • Conducted in vitro studies for adipogenic differentiation and stem cell recruitment, and in vivo studies for tissue repair, angiogenesis, and macrophage polarization.
  • Investigated the role of the integrin α2β1-FAK/Src signaling pathway.

Main Results:

  • SAF⁺ constructs demonstrated enhanced stiffness, elasticity, and resilience compared to SAF.
  • In vitro, SAF⁺ promoted adipogenic differentiation and stem cell recruitment.
  • In vivo, SAF⁺ significantly accelerated tissue repair, M2 macrophage polarization, angiogenesis, and stem cell homing.
  • The integrin α2β1-FAK/Src pathway was identified as a key mediator of these regenerative effects.

Conclusions:

  • Collagen-guided self-assembly provides a scaffold-free strategy for engineering stable adipose constructs.
  • SAF⁺ enhances mechanical properties and promotes a pro-regenerative microenvironment for soft-tissue repair.
  • This autologous approach offers improved handling, stability, and translational potential, bypassing limitations of synthetic scaffolds.