Lung injury-dependent oxidative status and chymotrypsin-like activity of skeletal muscles in hamsters with experimental emphysema

BMC Musculoskeletal Disorders

Flávia Alessandra Guarnier¹  Rubens Cecchini³  Sara Santos Bernardes²  Cláudia Roberta Brunnquell³  Alessandra Lourenço Cecchini²  Jair Tonon¹ 

[1] Laboratory of Free Radicals and Pathophysiology, Department of General Pathology, Rodovia Celso Garcia Cid, PR445, km 380 Campus Universitário, Londrina 86051-990, Brazil;Laboratory of Molecular Pathology, Department of General Pathology, Rodovia Celso Garcia Cid, PR445, km 380 Campus Universitário, Londrina, 86051-990, Brazil;Laboratory of Free Radicals and Pathophysiology, Department of General Pathology, Rodovia Celso Garcia Cid, PR445, km 380 Campus Universitário, Londrina, 86051-990, Brazil

关键词: Chymotrypsin-like activity;    Reactive oxygen species;    Skeletal muscle loss;    Cachexia;    Emphysema;   

Others  :  1134100
DOI  :  10.1186/1471-2474-14-39

 received in 2012-07-25, accepted in 2013-01-15,  发布年份 2013

【 摘 要 】

Background

Peripheral skeletal muscle is altered in patients suffering from emphysema and chronic obstructive pulmonary disease (COPD). Oxidative stress have been demonstrated to participate on skeletal muscle loss of several states, including disuse atrophy, mechanical ventilation, and chronic diseases. No evidences have demonstrated the occurance in a severity manner.

Methods

We evaluated body weight, muscle loss, oxidative stress, and chymotrypsin-like proteolytic activity in the gastrocnemius muscle of emphysemic hamsters. The experimental animals had 2 different severities of lung damage from experimental emphysema induced by 20 mg/mL (E20) and 40 mg/mL (E40) papain.

Results

The severity of emphysema increased significantly in E20 (60.52 ± 2.8, p < 0.05) and E40 (52.27 ± 4.7; crossed the alveolar intercepts) groups. As compared to the control group, there was a reduction on body (171.6 ± 15.9 g) and muscle weight (251.87 ± 24.87 mg) in the E20 group (157.5 ± 10.3 mg and 230.12 ± 23.52 mg, for body and muscle weight, respectively), which was accentuated in the E40 group (137.4 ± 7.2 g and 197.87 ± 10.49 mg, for body and muscle weight, respectively). Additionally, the thiobarbituric acid reactive substances (TBARS), tert-butyl hydroperoxide-initiated chemiluminescence (CL), carbonylated proteins, and chymotrypsin-like proteolytic activity were elevated in the E40 group as compared to the E20 group (p < 0.05 for all comparisons). The severity of emphysema significantly correlated with the progressive increase in CL (r = −0.95), TBARS (r = −0.98), carbonyl proteins (r = −0.99), and chymotrypsin-like proteolytic activity (r = −0.90). Furthermore, augmentation of proteolytic activity correlated significantly with CL (r = 0.97), TBARS (r = 0.96), and carbonyl proteins (r = 0.91).

Conclusions

Taken together, the results of the present study suggest that muscle atrophy observed in this model of emphysema is mediated by increased muscle chymotrypsin-like activity, with possible involvement of oxidative stress in a severity-dependent manner.

【 授权许可】

   
2013 Tonon et al.; licensee BioMed Central Ltd.

【 图 表 】

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