title: Interleukin-1 receptor antagonist in pleural effusion due to inflammatory and malignant lung disease.
abstract: Interleukin (IL)-1 is a key cytokine in inflammatory reactions. To clarify the mechanism of inflammation in the pleural cavity, we investigated the contribution of IL-1 and its antagonism to inflammatory processes in the pleural cavity. Interleukin-1 receptor antagonist (IL-1Ra) levels as well as IL-1 beta and interferon-gamma (IFN-gamma) levels were measured by enzyme immunoassay in pleural effusions from 70 patients. Pleural macrophages were also examined as possible sources of these cytokines in 10 patients. IL-1Ra was detectable in 28 patients (40%) out of 70 patients with pleural effusions. Patients with tuberculosis had significantly higher IL-1Ra as well as IFN-gamma levels in pleural effusion than patients with lung cancer. Transudative pleural effusions had low or undetectable IL-IRa levels. On the other hand, IL-1 beta levels were low, except in cases of parapneumonic pleural effusion. Spontaneous production of IL-1Ra pleural macrophages was observed in six patients, and IL-4 significantly augmented its production. Although spontaneous production of IL-1 beta was observed in only two patients, pleural macrophages produced significant amounts of IL-1 beta in response to lipopolysaccharide in all 10 patients examined. These results suggest that interleukin-1 receptor antagonist regulates various reactions by interleukin-1 in pleural effusion, and that pleural macrophages may act in situ as a source of interleukin-1 receptor antagonist.
authors.affiliation: Third Dept of Internal Medicine, University of Tokushima School of Medicine, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yanagawa
authors.forename: S
authors.initials: S
authors.lastname: Yano
authors.forename: T
authors.initials: T
authors.lastname: Haku
authors.forename: Y
authors.initials: Y
authors.lastname: Ohmoto
authors.forename: S
authors.initials: S
authors.lastname: Sone
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1 / Q000032:analysis*; D008175:Lung Neoplasms / Q000150:complications / Q000503:physiopathology; D016676:Macrophages, Alveolar / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D010996:Pleural Effusion / Q000209:etiology / Q000276:immunology*; D016066:Pleural Effusion, Malignant / Q000276:immunology / Q000378:metabolism; D011014:Pneumonia / Q000150:complications / Q000503:physiopathology; D012795:Sialoglycoproteins / Q000032:analysis*
chemical_list: C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D012795:Sialoglycoproteins