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Engineering 3D functional tissue constructs using self-assembling cell-laden microniches.

Dan Xing1, Wei Liu2, Jiao Jiao Li3

  • 1Arthritis Clinic & Research Center, Peking University People's Hospital, Peking University, Beijing 100044, China; Arthritis Institute, Peking University, Beijing 100044, China.

Acta Biomaterialia
|August 11, 2020
PubMed
Summary
This summary is machine-generated.

This study developed self-assembling 3D tissue constructs from microscopic hydrogels. These constructs enhance mesenchymal stem cell (MSC) function and successfully regenerate cartilage tissue in vivo.

Keywords:
Cartilage repairExtracellular matrixFunctional tissue constructHydrogelSelf-assembly

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Traditional tissue engineering faces limitations in producing macroscopic tissues.
  • Injectable biomaterials and fixed scaffolds struggle with scale and functionality.
  • Developing functional, macroscopic tissues requires novel approaches.

Purpose of the Study:

  • To engineer 3D functional tissue constructs via self-assembly of cell-laden microcryogels.
  • To investigate the impact of self-assembly on mesenchymal stem cell (MSC) viability, stemness, and function.
  • To demonstrate the application of these constructs in in vivo articular cartilage repair.

Main Methods:

  • Fabrication of cell-laden gelatin microcryogels (microniches).
  • Induction of microniches self-assembly using a 3D printed frame.
  • Analysis of extracellular matrix (ECM) accumulation and its effect on cell interactions.
  • Assessment of MSC stemness, senescence, and paracrine activity within self-assembled constructs.
  • In vivo evaluation of construct efficacy in articular cartilage defect repair.

Main Results:

  • Self-assembly of microniches led to ECM accumulation, strengthening cell-cell and cell-ECM interactions.
  • Self-assembled constructs created a biomimetic microenvironment, preserving MSC viability and function.
  • MSCs in self-assembled constructs exhibited improved stemness maintenance, reduced senescence, and enhanced paracrine activity.
  • The constructs successfully regenerated hyaline-like cartilage in vivo without additional factors.

Conclusions:

  • Self-assembly of microcryogel-based microniches is a promising strategy for creating functional 3D tissue constructs.
  • This approach optimizes MSC function and creates biomimetic environments for tissue regeneration.
  • The developed constructs hold significant potential for generating tissue-engineered organoids and repairing challenging tissue defects.