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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

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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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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 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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Video Experimental Relacionado

Updated: Sep 9, 2025

Induction and Assessment of Exertional Skeletal Muscle Damage in Humans
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Daño e inflamación del músculo esquelético

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
PubMed
Resumen

La regeneración del músculo esquelético depende de una respuesta inflamatoria oportuna. Las células inmunes como los neutrófilos y los macrófagos son cruciales para limpiar los desechos y promover la reparación muscular después de una lesión.

Palabras clave:
Las lesionesLos macrófagosLas células asesinas naturalesLos neutrófilos

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Área de la Ciencia:

  • Fisiología y regeneración muscular
  • Inmunología y inflamación
  • Modelos de lesiones del músculo esquelético

Sus antecedentes:

  • El músculo esquelético posee una notable plasticidad, lo que le permite responder a varios estímulos dañinos.
  • El daño muscular desencadena una respuesta inflamatoria esencial para la regeneración eficaz de los tejidos.
  • Se utilizan métodos estandarizados, incluido el ejercicio excéntrico y las inyecciones de miotoxina, para inducir el daño del músculo esquelético.

Objetivo del estudio:

  • Para aclarar el papel de la respuesta inflamatoria en la regeneración del músculo esquelético.
  • Para detallar la infiltración secuencial y la función de las células inmunes después de la lesión muscular.
  • Para resaltar la importancia de la polarización de los macrófagos en el proceso miogénico.

Principales métodos:

  • Inducción del daño del músculo esquelético utilizando modelos establecidos.
  • Monitoreo de la infiltración y activación de las células inmunes, específicamente los neutrófilos y los macrófagos.
  • Observación de la transición de los macrófagos de un fenotipo proinflamatorio (M1) a uno antiinflamatorio (M2).

Principales resultados:

  • Los neutrófilos son los primeros en responder, limpiando los desechos y reclutando macrófagos.
  • La transición de los macrófagos de un fenotipo M1, que ayuda a eliminar los desechos, a un fenotipo M2.
  • Los macrófagos M2 son críticos para iniciar la respuesta miogénica necesaria para la reparación muscular.

Conclusiones:

  • La respuesta inflamatoria es indispensable para una recuperación óptima del músculo esquelético.
  • Las interrupciones en la cascada inflamatoria, particularmente la polarización de los macrófagos, perjudican la regeneración muscular.
  • Comprender este proceso es clave para desarrollar estrategias terapéuticas para las lesiones musculares.