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Related Concept Videos

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Related Experiment Video

Updated: Sep 9, 2025

Induction of Acute Skeletal Muscle Regeneration by Cardiotoxin Injection
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Regulatory T Cell Attracting Therapy Accelerates Skeletal Muscle Functional Recovery Following Injury.

Matthew A Borrelli1, Jordan Jp Warunek2, Steven R Little1

  • 1University of Pittsburgh.

Research Square
|September 2, 2025
PubMed
Summary
This summary is machine-generated.

Targeting regulatory T cells (Treg) with CCL22-delivering microparticles (CCL22MP) significantly improved muscle repair and limb function after injury. This approach enhances Treg accumulation, accelerating recovery from skeletal muscle damage.

Keywords:
ImmunomodulationInjuryMicroparticlesSkeletal MuscleTissue RepairTreg

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Area of Science:

  • Muscle regeneration and immunology
  • Biomaterials for therapeutic delivery

Background:

  • Skeletal muscle injuries are common and impact physical activity.
  • Regulatory T cells (Treg) are key in immune responses post-injury.
  • CCL22 chemokine attracts Treg to inflammatory sites.

Purpose of the Study:

  • To investigate if targeted Treg delivery accelerates muscle injury resolution.
  • To evaluate the efficacy of CCL22-loaded microparticles (CCL22MP) in a muscle injury model.

Main Methods:

  • Cardiotoxin (CTx)-induced muscle injury model in rodents.
  • Administration of sustained-release polymeric microparticles delivering CCL22 (CCL22MP).
  • Assessment of limb function, histology, and local immune cell populations.

Main Results:

  • CCL22MP treatment significantly improved limb function on days 3 and 5 post-injury.
  • Histology revealed a reduced area of injury in CCL22MP treated limbs.
  • Increased Treg, myeloid-derived suppressor cells, and neutrophils were observed locally.

Conclusions:

  • Amplifying local Treg concentrations at damaged sites promotes skeletal muscle repair.
  • CCL22MP offers a promising therapeutic strategy for accelerating recovery from muscle injuries.