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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Updated: Jun 3, 2025

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MicroSphere 3D Structures Delay Tissue Senescence through Mechanotransduction.

Ziang Li1, Jincheng Tang1, Liang Zhou1

  • 1Department of Orthopedics, The First Affiliated Hospital of Soochow University, 899 Pinghai Road, Soochow, Jiangsu 215000, China.

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Summary
This summary is machine-generated.

Biomimetic microgels promote nucleus pulposus cell regeneration and reduce intervertebral disc degeneration. These engineered extracellular matrix structures enhance cell activity and possess anti-aging properties for tissue repair.

Keywords:
ECMIVDcellular morphologymechanotransductionsenescence

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cell Biology

Background:

  • Extracellular matrix (ECM) plays a crucial role in cellular signaling and tissue homeostasis.
  • The impact of biomimetic ECM structures on aging and degeneration, particularly in the nucleus pulposus (NP), remains unclear.
  • Understanding cellular responses to engineered ECM is vital for developing effective regenerative therapies.

Purpose of the Study:

  • To investigate how anisotropic biomaterial microgels influence nucleus pulposus (NP) cell behavior and their potential to counteract intervertebral disc (IVD) degeneration.
  • To explore the mechanisms by which engineered ECM regulates cellular activities and promotes tissue repair.

Main Methods:

  • Fabrication of anisotropic biomaterial microgels (MicroRod and MicroSphere) using physical extrusion and controlled cross-linking.
  • Culturing NP cells on microgels to assess cell alignment, proliferation, and apoptosis.
  • Investigating cellular signaling pathways (YAP/TAZ, cGAS-STING) involved in NP cell response.
  • In vivo implantation of MicroRod with NP cells into degenerated IVD models.

Main Results:

  • NP cells demonstrated aligned growth, enhanced proliferation, and reduced apoptosis on MicroRod structures.
  • Cellular responses indicated adhesion, mechanosensing, and cytoskeletal remodeling in response to microgel cues.
  • Activation of YAP/TAZ and cGAS-STING pathways was observed, suggesting a role in rectifying aging mechanisms.
  • In vivo studies showed reduced inflammation and protease secretion, alongside NP tissue regeneration in degenerated discs.

Conclusions:

  • Anisotropic biomaterial microgels can effectively regulate NP cell behavior and promote tissue regeneration.
  • Mechanical stress and biomimetic ECM cues are critical for maintaining cellular activity and anti-aging effects.
  • Engineered ECM holds promise for developing antidegenerative therapies for intervertebral disc disease.