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Chronic obstructive pulmonary disease is a common, preventable, and treatable respiratory disorder characterized by persistent symptoms and progressive airflow limitation. This limitation results from a combination of small-airway disease (obstructive bronchiolitis) and parenchymal destruction (emphysema), both driven by chronic inflammation from exposure to harmful particles or gases.The disease includes two main pathological entities: emphysema, marked by destruction of alveolar walls and...
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Epigenetics and muscle dysfunction in chronic obstructive pulmonary disease.

Esther Barreiro1, Joaquim Gea1

  • 1Respiratory Medicine Department-Muscle and Respiratory System Research Unit, Institute of Medical Research of Hospital del Mar (IMIM)-Hospital del Mar, Parc de Salut Mar, Barcelona Biomedical Research Park (PRBB), Barcelona, Spain; Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III (ISCIII), Madrid, Spain.

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Epigenetic modifications, including DNA methylation and microRNAs, contribute to skeletal muscle dysfunction in chronic obstructive pulmonary disease (COPD). Understanding these mechanisms is key to addressing COPD-related muscle wasting and improving patient quality of life.

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Area of Science:

  • Pulmonary Medicine
  • Molecular Biology
  • Skeletal Muscle Physiology

Background:

  • Chronic obstructive pulmonary disease (COPD) is a global health issue associated with significant morbidity and mortality.
  • Systemic manifestations, particularly skeletal muscle dysfunction, severely impact COPD patients' exercise capacity and quality of life.
  • Epigenetic mechanisms are increasingly recognized as crucial factors in the development of COPD-related muscle dysfunction.

Purpose of the Study:

  • To review the role of epigenetic mechanisms in muscle development and adaptation.
  • To discuss epigenetic events implicated in COPD muscle dysfunction and mass loss.
  • To present findings on microRNA expression profiles in COPD patient muscles.

Main Methods:

  • Literature review of epigenetic mechanisms in muscle.
  • Analysis of epigenetic events in COPD muscle pathology.
  • Examination of microRNA expression in diaphragm and vastus lateralis muscles from COPD patients.

Main Results:

  • Epigenetic modifications like DNA methylation, histone acetylation, and microRNAs are involved in COPD muscle dysfunction.
  • Altered expression of muscle-specific microRNAs observed in COPD patients.
  • Protein hyperacetylation may enhance muscle protein catabolism in limb muscles of COPD patients.

Conclusions:

  • Epigenetic dysregulation plays a significant role in skeletal muscle dysfunction in COPD.
  • Further research is needed to fully elucidate the triggers and pathways of epigenetic mechanisms in COPD muscle wasting.
  • Targeting epigenetic modifications may offer novel therapeutic strategies for COPD-related muscle dysfunction.