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Epigenetic mechanisms in respiratory muscle dysfunction of patients with chronic obstructive pulmonary disease.

Puig-Vilanova E, Aguiló R, Rodríguez-Fuster A, Martínez-Llorens J, Gea J, Barreiro E - PLoS ONE (2014)

Bottom Line: Moreover, in the diaphragm of the COPD patients, muscle-specific microRNA expression was downregulated, while HDAC4 and myocyte enhancer factor (MEF)2C protein levels were higher, and DNA methylation levels, muscle fiber types and sizes did not differ between patients and controls.In the main respiratory muscle of COPD patients with a wide range of disease severity and normal body composition, muscle-specific microRNAs were downregulated, while HDAC4 and MEF2C levels were upregulated.These findings may offer novel therapeutic strategies to specifically target respiratory muscle dysfunction in patients with COPD.

View Article: PubMed Central - PubMed

Affiliation: Pulmonology Department-Muscle and Respiratory System Research Unit (URMAR), IMIM-Hospital del Mar, Parc de Salut Mar, Health and Experimental Sciences Department (CEXS), Universitat Pompeu Fabra (UPF), Barcelona Biomedical Research Park (PRBB), Barcelona, Spain; Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III (ISCIII), Madrid, Spain.

ABSTRACT
Epigenetic events are differentially expressed in the lungs and airways of patients with chronic obstructive pulmonary disease (COPD). Moreover, epigenetic mechanisms are involved in the skeletal (peripheral) muscle dysfunction of COPD patients. Whether epigenetic events may also regulate respiratory muscle dysfunction in COPD remains unknown. We hypothesized that epigenetic mechanisms would be differentially expressed in the main inspiratory muscle (diaphragm) of patients with COPD of a wide range of disease severity compared to healthy controls. In diaphragm muscle specimens (thoracotomy due to lung localized neoplasms) of sedentary patients with mild-to-moderate and severe COPD, with preserved body composition, and sedentary healthy controls, expression of muscle-enriched microRNAs, histone acetyltransferases (HATs) and deacetylases (HDACs), total DNA methylation and protein acetylation, small ubiquitin-related modifier (SUMO) ligases, muscle-specific transcription factors, and muscle structure were explored. All subjects were also clinically evaluated: lung and muscle functions and exercise capacity. Compared to healthy controls, patients exhibited moderate airflow limitation and diffusion capacity, and reduced exercise tolerance and transdiaphragmatic strength. Moreover, in the diaphragm of the COPD patients, muscle-specific microRNA expression was downregulated, while HDAC4 and myocyte enhancer factor (MEF)2C protein levels were higher, and DNA methylation levels, muscle fiber types and sizes did not differ between patients and controls. In the main respiratory muscle of COPD patients with a wide range of disease severity and normal body composition, muscle-specific microRNAs were downregulated, while HDAC4 and MEF2C levels were upregulated. It is likely that these epigenetic events act as biological adaptive mechanisms to better overcome the continuous inspiratory loads of the respiratory system in COPD. These findings may offer novel therapeutic strategies to specifically target respiratory muscle dysfunction in patients with COPD.

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Protein levels of transcription factors shown to be involved in myogenesis and muscle repair in the diaphragms of COPD patients and controls.Mean values and standard deviation (protein levels) of MyoD, Pax7, SRF, and BAF60c expression did not differ (n.s., non-significant) between the study subjects (n.s., non-significant, panels A, B, C, and D, respectively).
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pone-0111514-g007: Protein levels of transcription factors shown to be involved in myogenesis and muscle repair in the diaphragms of COPD patients and controls.Mean values and standard deviation (protein levels) of MyoD, Pax7, SRF, and BAF60c expression did not differ (n.s., non-significant) between the study subjects (n.s., non-significant, panels A, B, C, and D, respectively).

Mentions: Compared to controls, protein levels of MEF2C were increased in the diaphragm of the COPD patients (Figure 6A), whereas protein levels of myocyte-enhancer factor (MEF)2D, YY1, MyoD, Pax7, serum response factor (SRF) and BRG1/BRM-associated factor (BAF)60c did not differ between the study groups (Figures 6B–6C and 7A–7D).


Epigenetic mechanisms in respiratory muscle dysfunction of patients with chronic obstructive pulmonary disease.

Puig-Vilanova E, Aguiló R, Rodríguez-Fuster A, Martínez-Llorens J, Gea J, Barreiro E - PLoS ONE (2014)

Protein levels of transcription factors shown to be involved in myogenesis and muscle repair in the diaphragms of COPD patients and controls.Mean values and standard deviation (protein levels) of MyoD, Pax7, SRF, and BAF60c expression did not differ (n.s., non-significant) between the study subjects (n.s., non-significant, panels A, B, C, and D, respectively).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4219759&req=5

pone-0111514-g007: Protein levels of transcription factors shown to be involved in myogenesis and muscle repair in the diaphragms of COPD patients and controls.Mean values and standard deviation (protein levels) of MyoD, Pax7, SRF, and BAF60c expression did not differ (n.s., non-significant) between the study subjects (n.s., non-significant, panels A, B, C, and D, respectively).
Mentions: Compared to controls, protein levels of MEF2C were increased in the diaphragm of the COPD patients (Figure 6A), whereas protein levels of myocyte-enhancer factor (MEF)2D, YY1, MyoD, Pax7, serum response factor (SRF) and BRG1/BRM-associated factor (BAF)60c did not differ between the study groups (Figures 6B–6C and 7A–7D).

Bottom Line: Moreover, in the diaphragm of the COPD patients, muscle-specific microRNA expression was downregulated, while HDAC4 and myocyte enhancer factor (MEF)2C protein levels were higher, and DNA methylation levels, muscle fiber types and sizes did not differ between patients and controls.In the main respiratory muscle of COPD patients with a wide range of disease severity and normal body composition, muscle-specific microRNAs were downregulated, while HDAC4 and MEF2C levels were upregulated.These findings may offer novel therapeutic strategies to specifically target respiratory muscle dysfunction in patients with COPD.

View Article: PubMed Central - PubMed

Affiliation: Pulmonology Department-Muscle and Respiratory System Research Unit (URMAR), IMIM-Hospital del Mar, Parc de Salut Mar, Health and Experimental Sciences Department (CEXS), Universitat Pompeu Fabra (UPF), Barcelona Biomedical Research Park (PRBB), Barcelona, Spain; Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III (ISCIII), Madrid, Spain.

ABSTRACT
Epigenetic events are differentially expressed in the lungs and airways of patients with chronic obstructive pulmonary disease (COPD). Moreover, epigenetic mechanisms are involved in the skeletal (peripheral) muscle dysfunction of COPD patients. Whether epigenetic events may also regulate respiratory muscle dysfunction in COPD remains unknown. We hypothesized that epigenetic mechanisms would be differentially expressed in the main inspiratory muscle (diaphragm) of patients with COPD of a wide range of disease severity compared to healthy controls. In diaphragm muscle specimens (thoracotomy due to lung localized neoplasms) of sedentary patients with mild-to-moderate and severe COPD, with preserved body composition, and sedentary healthy controls, expression of muscle-enriched microRNAs, histone acetyltransferases (HATs) and deacetylases (HDACs), total DNA methylation and protein acetylation, small ubiquitin-related modifier (SUMO) ligases, muscle-specific transcription factors, and muscle structure were explored. All subjects were also clinically evaluated: lung and muscle functions and exercise capacity. Compared to healthy controls, patients exhibited moderate airflow limitation and diffusion capacity, and reduced exercise tolerance and transdiaphragmatic strength. Moreover, in the diaphragm of the COPD patients, muscle-specific microRNA expression was downregulated, while HDAC4 and myocyte enhancer factor (MEF)2C protein levels were higher, and DNA methylation levels, muscle fiber types and sizes did not differ between patients and controls. In the main respiratory muscle of COPD patients with a wide range of disease severity and normal body composition, muscle-specific microRNAs were downregulated, while HDAC4 and MEF2C levels were upregulated. It is likely that these epigenetic events act as biological adaptive mechanisms to better overcome the continuous inspiratory loads of the respiratory system in COPD. These findings may offer novel therapeutic strategies to specifically target respiratory muscle dysfunction in patients with COPD.

Show MeSH
Related in: MedlinePlus