4.6 Article

Does oxidative stress modulate limb muscle atrophy in severe COPD patients?

Journal

EUROPEAN RESPIRATORY JOURNAL
Volume 40, Issue 4, Pages 851-862

Publisher

EUROPEAN RESPIRATORY SOC JOURNALS LTD
DOI: 10.1183/09031936.00137211

Keywords

Muscle protein loss; oxidative stress; quadriceps muscle dysfunction; severe chronic obstructive pulmonary disease; signalling pathways; ubiquitin-proteasome system

Funding

  1. FUCAP
  2. Marato TV3 (Spain) [MTV3-07-1010]
  3. BIO-BRIDGE [LSHG-CT-2006-037939]
  4. European Respiratory Society COPD Research Award
  5. [FES 06/1043]
  6. [FIS 11/02029]
  7. [CIBERES]
  8. [SAF 2007-62719]
  9. [2005-SGR01060]
  10. [2009-SGR-393]
  11. [SEPAR 2008]
  12. [SEPAR 2010]
  13. [FUCAP 2008]

Ask authors/readers for more resources

Oxidative stress may differentially regulate protein loss within peripheral muscles of severe chronic obstructive pulmonary disease (COPD) patients exhibiting different body composition. Oxidation levels of proteins, myosin heavy chain (MyHC) and myonuclei, superoxide anion, antioxidants, actin, creatine kinase, carbonic anhydrase-3, ubiquitin-proteasome system, redox-signalling pathways, inflammation and muscle structure, and damage were quantified in limb muscles of severe COPD patients with and without muscle wasting, and in sedentary controls. Compared with controls, in the quadriceps of muscle-wasted COPD patients, levels of protein carbonylation, oxidation of MyHC and myonuclei, superoxide anion production, superoxide dismutase, total protein ubiquinitation, E2(14k), atrogin-1, FoxO1 and p65 were higher, while content of MyHC, creatine kinase, carbonic anhydrase-3, myogenin, and fast-twitch fibre size were decreased. Importantly, in nonwasted COPD patients, where MyHC was more oxidised than in controls, its content was preserved. Muscle inflammation and glutathione levels did not differ between patients and controls. In all patients, muscle structure abnormalities were increased, while muscle force and exercise capacity were reduced. In severe COPD, while muscle oxidative stress increases regardless of their body composition, protein ubiquitination and loss of MyHC were enhanced only in patients exhibiting muscle atrophy. Oxidative stress does not seem to directly modulate muscle protein loss in these patients.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available