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Related Concept Videos

Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
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Myocarditis I: Introduction01:21

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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
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Inflammation01:38

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Inflammatory Response I: Vascular and Cellular01:30

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The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
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Satellite Stem Cells and Muscular Dystrophy01:21

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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Related Experiment Video

Updated: Sep 9, 2025

Induction and Assessment of Exertional Skeletal Muscle Damage in Humans
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Induction and Assessment of Exertional Skeletal Muscle Damage in Humans

Published on: December 11, 2016

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Skeletal Muscle Damage and Inflammation.

Tyrone A Washington1, Eleanor R Schrems2

  • 1Exercise Muscle Biology Laboratory, Exercise Science Research Center, Department of Health, Human Performance and Recreation, University of Arkansas, Fayetteville, AR, USA. tawashin@uark.edu.

Advances in Experimental Medicine and Biology
|August 29, 2025
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Summary

Skeletal muscle regeneration depends on a timely inflammatory response. Immune cells like neutrophils and macrophages are crucial for clearing debris and promoting muscle repair after injury.

Keywords:
InjuryMacrophageNatural killer cellsNeutrophils

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Area of Science:

  • Muscle physiology and regeneration
  • Immunology and inflammation
  • Skeletal muscle injury models

Background:

  • Skeletal muscle possesses remarkable plasticity, enabling it to respond to various damaging stimuli.
  • Muscle damage triggers an inflammatory response essential for effective tissue regeneration.
  • Standardized methods, including eccentric exercise and myotoxin injections, are used to induce skeletal muscle damage.

Purpose of the Study:

  • To elucidate the role of the inflammatory response in skeletal muscle regeneration.
  • To detail the sequential infiltration and function of immune cells following muscle injury.
  • To highlight the importance of macrophage polarization in the myogenic process.

Main Methods:

  • Induction of skeletal muscle damage using established models.
  • Monitoring the infiltration and activation of immune cells, specifically neutrophils and macrophages.
  • Observing the transition of macrophages from a pro-inflammatory (M1) to an anti-inflammatory (M2) phenotype.

Main Results:

  • Neutrophils are the initial responders, clearing debris and recruiting macrophages.
  • Macrophages transition from an M1 phenotype, aiding debris clearance, to an M2 phenotype.
  • M2 macrophages are critical for initiating the myogenic response necessary for muscle repair.

Conclusions:

  • The inflammatory response is indispensable for optimal skeletal muscle recovery.
  • Disruptions in the inflammatory cascade, particularly macrophage polarization, impair muscle regeneration.
  • Understanding this process is key to developing therapeutic strategies for muscle injuries.