Muscle metabolic status in patients with severe COPD with and without long-term prednisolone

Both abnormalities in high energy phosphate metabolism and a decreased oxidative enzyme capacity have been reported in skeletal muscle of stable chronic obstructive pulmonary disease (COPD) patients. The first aim of this study was to investigate whether these findings are present in anterior tibialis muscle and whether or not they are associated. Abnormalities in mitochondrial structure and function as well as signs of myopathy have been found during corticosteroid treatment. The second aim of this study, therefore, was to investigate whether in COPD patients prolonged use of low dose prednisolone has effects on muscle energy metabolism and qualitative morphology. In a cross-sectional study 15 COPD patients (forced expiratory volume in one second (FEV1) 33+/-9 (mean+/-SD) % predicted) who were steroid-naive (CORT-) were compared with 10 healthy control subjects (HC) and with 14 COPD patients (FEV1 30+/-11 % pred), who had been using oral prednisolone for at least 1 yr (CORT+). It was found that adenosine triphosphate (ATP)/adenosine diphosphate was lower in CORT- compared to HC (5.7 versus 6.2, p=0.03). Inosine monophosphate was detected in 13 of 15 CORT- compared to 3 of 10 HC (p=0.004). However, although indications were found for an imbalance in production and utilization of ATP, comparing CORT- and HC, no differences in oxidative (citrate synthase and 3-hydroxy-acyl-coenzyme A dehydrogenase) and glycolytic (hexokinase, lactate dehydrogenase and phosphofructokinase) enzyme capacities were found. When, comparing steroid-treated and steroid-naive patient subgroups, no differences in the above mentioned parameters of muscle energy metabolism and of muscle qualitative morphology were found.

This article has been cited by other articles:

				H. R. Gosker, M. K. C. Hesselink, H. Duimel, K. A. Ward, and A. M. W. J. Schols Reduced mitochondrial density in the vastus lateralis muscle of patients with COPD Eur. Respir. J., July 1, 2007; 30(1): 73 - 79. [Abstract] [Full Text] [PDF]

				M. Hayot, A. Michaud, C. Koechlin, M-A. Caron, P. LeBlanc, C. Prefaut, and F. Maltais Skeletal muscle microbiopsy: a validation study of a minimally invasive technique Eur. Respir. J., March 1, 2005; 25(3): 431 - 440. [Abstract] [Full Text] [PDF]

				W D-C Man, M G G Soliman, D Nikoletou, M L Harris, G F Rafferty, N Mustfa, M I Polkey, and J Moxham Non-volitional assessment of skeletal muscle strength in patients with chronic obstructive pulmonary disease Thorax, August 1, 2003; 58(8): 665 - 669. [Abstract] [Full Text] [PDF]

				Y. F. Heijdra, V. Pinto-Plata, R. Frants, J. Rassulo, L. Kenney, and B. R. Celli Muscle Strength and Exercise Kinetics in COPD Patients With a Normal Fat-Free Mass Index Are Comparable to Control Subjects Chest, July 1, 2003; 124(1): 75 - 82. [Abstract] [Full Text] [PDF]

				M. P. Engelen, N. E. Deutz, R. Mostert, E. F. Wouters, and A. M. Schols Response of whole-body protein and urea turnover to exercise differs between patients with chronic obstructive pulmonary disease with and without emphysema Am. J. Clinical Nutrition, April 1, 2003; 77(4): 868 - 874. [Abstract] [Full Text] [PDF]

				H. R Gosker, M. P. Engelen, H. van Mameren, P. J van Dijk, G. J van der Vusse, E. F. Wouters, and A. M. Schols Muscle fiber type IIX atrophy is involved in the loss of fat-free mass in chronic obstructive pulmonary disease Am. J. Clinical Nutrition, July 1, 2002; 76(1): 113 - 119. [Abstract] [Full Text] [PDF]