Related Experiment Video

Updated: May 4, 2026

Promotion of Survival and Differentiation of Neural Stem Cells with Fibrin and Growth Factor Cocktails after Severe Spinal Cord Injury
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TGF-β-induced fibrotic scar formation limits recovery of spinal cord injury

Dayu Pan1, Panfeng Wu1, Kathleen Noller1,2

  • 1Departments of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Bone Research
|February 25, 2026
PubMed

Insights

Inhibiting fibrotic scar formation after spinal cord injury (SCI) significantly improved recovery in mice. Blocking transforming growth factor-beta (TGF-β) activation or neutralizing TGF-β reduced scarring and enhanced functional outcomes.

Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Immunology

Background:

  • Spinal cord injury (SCI) leads to long-term disability due to limited regeneration.
  • Fibrotic scar formation at the injury site impedes functional recovery after SCI.

Purpose of the Study:

  • To investigate the role of fibrotic scar formation in SCI recovery.
  • To identify molecular pathways driving scar formation after SCI.
  • To evaluate therapeutic strategies targeting scar formation for SCI treatment.

Main Methods:

  • Investigated macrophage and mesenchymal stromal/stem cell (MSC) interactions post-SCI in mice.
  • Examined the role of transforming growth factor-beta 1 (TGF-β1) in scar development.
  • Utilized genetic knockouts (KOs) and TGF-β-neutralizing antibodies to inhibit scar formation.
  • Compared SCI recovery in adult and neonatal mice.

Main Results:

  • Elevated macrophages after SCI produce TGF-β1, promoting MSC differentiation into fibroblasts and scar formation.
  • Activated TGF-β1 also induces pericyte differentiation into fibroblasts, contributing to scarring.
  • Inhibition of TGF-β1 pathways via genetic KOs or antibody treatment reduced scarring and improved functional recovery in adult mice.
  • Neonatal mice exhibited scarless recovery with minimal active TGF-β at the injury site.

Conclusions:

  • Fibrotic scarring after SCI is driven by elevated TGF-β activation.
  • Targeting TGF-β activation or neutralizing TGF-β presents a promising therapeutic strategy for improving SCI outcomes.
  • Understanding scar formation mechanisms is crucial for developing effective SCI regeneration therapies.

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