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Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair
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Published on: March 22, 2024

Neuronal pathways in tendon healing.

Paul W Ackermann1, Paul T Salo, David A Hart

  • 1Orthopedic Laboratory, Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden. paul.ackermann@karolinska.se

Frontiers in Bioscience (Landmark Edition)
|June 2, 2009
PubMed
Summary
This summary is machine-generated.

The nervous system actively regulates tendon repair and pain through autonomic, sensory, and glutamatergic pathways. Understanding these neuronal signals in healthy, healing, and injured tendons is crucial for future therapies.

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Area of Science:

  • Neuroscience
  • Orthopedics
  • Regenerative Medicine

Background:

  • Tendon homeostasis and repair mechanisms are incompletely understood.
  • The nervous system, beyond sensory input, actively influences pain, inflammation, and tissue repair via efferent pathways.
  • Three key neuronal signaling pathways (autonomic, sensory, glutamatergic) are implicated in tendon function.

Purpose of the Study:

  • To elucidate the role of neuronal signaling in normal, healing, and tendinopathic tendons.
  • To investigate the distribution and function of neural elements in different tendon states.
  • To explore the potential of neuronal mediators in treating tendon disorders.

Main Methods:

  • Analysis of neuronal signaling pathways (autonomic, sensory, glutamatergic) in various tendon conditions.
  • Histological examination of nerve distribution in healthy, healing, and diseased tendons.
  • Assessment of neuromediator presence and temporal dynamics during tendon repair.

Main Results:

  • Healthy tendons primarily feature neural elements in the paratenon, with minimal innervation of the tendon proper.
  • Tendon repair involves significant nerve ingrowth into the tendon proper, accompanied by sensory, autonomic, and glutamatergic mediator expression.
  • Tendinopathy may involve excessive sensory and glutamatergic signaling, contributing to inflammation and tissue changes.

Conclusions:

  • The nervous system plays a critical role in regulating tendon homeostasis, inflammation, and repair.
  • Aberrant neuronal signaling in tendinopathy contributes to pathology.
  • Neuronal mediators offer potential therapeutic targets for tendon disorders.