Abstract:
:The aim of this study was to test the hypothesis that systemic inflammation in patients with chronic obstructive pulmonary disease (COPD) is accompanied by enhanced interleukin 18 (IL-18) expression in skeletal muscle, which may precede muscle weight loss. Twenty patients with moderate to severe COPD [12 women, 66 +/- 9.4 years of age and forced expiratory volume in 1 second (FEV(1)) of 32% +/- 12 % of predicted value] and 20 healthy age-, gender-, and body mass index (BMI)-matched controls (10 nonsymptomatic smokers and 10 nonsmokers) were included in the study. Plasma levels of IL-18 were elevated in COPD patients (n = 20) versus healthy controls (n = 20) (221.2 pg/ml [196.0-294.2 pg/pl] vs. 164.8 pg/ml [144.4-193.3 pg/pl], p = 0.05) [corrected] and IL-18 was expressed in skeletal muscle, with IL-18 mRNA levels being elevated in biopsies from COPD patients (n = 19) versus healthy controls (n = 18) (4.3 [2.6-5.9] vs. 2.4 [1.6-3.1], p = 0.05) [corrected]. Immunohistochemical evaluation revealed a strong expression of IL-18 in Type II muscle fibers from COPD patients. Plasma levels and skeletal muscle mRNA levels of tumor necrosis factor alpha (TNF-alpha) and IL-6 did not differ between the groups. Elevated skeletal muscle expression of IL-18 was found in COPD patients with normal body weight, indicating that IL-18 potentially may be involved in the pathogenesis of COPD-associated muscle wasting.
journal_name
Lungjournal_title
Lungauthors
Petersen AM,Penkowa M,Iversen M,Frydelund-Larsen L,Andersen JL,Mortensen J,Lange P,Pedersen BKdoi
10.1007/s00408-007-9000-7subject
Has Abstractpub_date
2007-05-01 00:00:00pages
161-71issue
3eissn
0341-2040issn
1432-1750journal_volume
185pub_type
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