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Cellular Adaptation II: Hypertrophy

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Induction of Acute Skeletal Muscle Regeneration by Cardiotoxin Injection
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Published on: January 1, 2017

Do inflammatory cells influence skeletal muscle hypertrophy?

Timothy J Koh1, Francis X Pizza

  • 1Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL 60612, USA. tjkoh@uic.edu

Frontiers in Bioscience (Elite Edition)
|June 2, 2009
PubMed
Summary

Inflammatory cells like macrophages are essential for muscle hypertrophy, a process of muscle growth. Further research is needed to understand the role of neutrophils and inflammatory signals in muscle adaptation.

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Area of Science:

  • Muscle physiology and immunology
  • Skeletal muscle adaptation and repair

Background:

  • Mechanical loading is a primary driver of muscle hypertrophy.
  • Emerging evidence suggests inflammatory cells, including neutrophils and macrophages, influence muscle growth.
  • Macrophages have been identified as essential for hypertrophy following synergist ablation.

Purpose of the Study:

  • To investigate the role of inflammatory cells, specifically neutrophils and macrophages, in skeletal muscle hypertrophy.
  • To explore the molecular signals that recruit and regulate inflammatory cells in muscle.
  • To further elucidate the functional activities of macrophages in promoting muscle hypertrophy.

Main Methods:

  • Studies involving mechanical loading models of muscle hypertrophy.
  • Experimental models utilizing synergist ablation to induce muscle growth.
  • Analysis of neutrophil and macrophage infiltration and function in skeletal muscle.

Main Results:

  • Macrophages are demonstrated to be essential for muscle hypertrophy after synergist ablation.
  • Non-steroidal anti-inflammatory drugs have been shown to impair skeletal muscle adaptive responses.
  • Macrophages produce growth-promoting factors during muscle hypertrophy.

Conclusions:

  • Inflammatory cells, particularly macrophages, play integral roles in regulating muscle hypertrophy.
  • Further research is required to understand the precise mechanisms and molecular signals involved.
  • The findings suggest a complex interplay between mechanical loading, inflammation, and muscle adaptation.