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Cell specific ingrowth hydrogels.

Mona Bracher1, Deon Bezuidenhout, Matthias P Lutolf

  • 1Cardiovascular Research Unit, Chris Barnard Division of Cardiothoracic Surgery, University of Cape Town, Department of Health Sciences, Cape Town, South Africa.

Biomaterials
|June 20, 2013
PubMed
Summary
This summary is machine-generated.

Researchers engineered synthetic extracellular matrix mimics. By using specific enzyme-cleavable peptides, they selectively controlled the invasion of vascular smooth muscle cells and fibroblasts, offering new avenues for tissue engineering.

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Tissue Engineering

Background:

  • Extracellular matrix (ECM) mimics are crucial for understanding cell behavior and developing tissue regenerative strategies.
  • Hydrogels composed of polyethylene glycol (PEG) and peptide crosslinkers can be engineered to mimic ECM properties.
  • Matrix metalloproteinases (MMPs) play a key role in ECM remodeling and cell invasion.

Purpose of the Study:

  • To investigate the selective invasion of fibroblasts and vascular smooth muscle cells (VSMCs) into engineered hydrogels.
  • To determine if MMP-specific peptide crosslinkers can differentially control cell invasion.
  • To explore the potential of these hydrogels in tissue engineering and regenerative medicine.

Main Methods:

  • Fabrication of polyethylene glycol (PEG) hydrogels crosslinked with peptides.
  • Incorporation of peptides selectively cleaved by matrix metalloproteinases (MMPs), specifically MMP-14 and MMP-9.
  • Quantification of fibroblast and VSMC invasion into hydrogels with varying peptide crosslinkers.
  • Comparison of cell invasion rates between different cell types and hydrogel compositions.

Main Results:

  • Both fibroblasts and VSMCs invaded hydrogels with generally permissive MMP cleavage sites equally.
  • VSMCs showed a two-fold increase in invasion into MMP-14 selective hydrogels compared to permissive hydrogels.
  • Fibroblast invasion into MMP-14 selective hydrogels decreased by two-fold relative to permissive hydrogels (p < 0.01).

Conclusions:

  • Selective control of cell invasion into synthetic ECM mimics is achievable by tailoring the protease specificity of peptide crosslinkers.
  • The differential response of VSMCs and fibroblasts to MMP-14 selective hydrogels highlights the potential for cell-type specific engineering.
  • These findings suggest broad applicability in tissue regeneration and engineering by precisely controlling cell behavior within biomaterial scaffolds.