PMID- 15753633 OWN - NLM STAT- MEDLINE DCOM- 20050531 LR - 20151119 IS - 0025-7931 (Print) IS - 0025-7931 (Linking) VI - 72 IP - 1 DP - 2005 Jan-Feb TI - Increased levels of interleukin-18 in bronchoalveolar lavage fluid of patients with idiopathic nonspecific interstitial pneumonia. PG - 39-45 AB - BACKGROUND: Interleukin-18 (IL-18) is a proinflammatory cytokine that can induce interferon-gamma (IFN-gamma), and it plays an important role in T-helper 1 responses. Among idiopathic interstitial pneumonia (IIP), nonspecific interstitial pneumonia (NSIP) has an increased number of lymphocytes in bronchoalveolar lavage (BAL) fluid compared with usual interstitial pneumonia (UIP). However, the difference in their pathogenesis is unclear. OBJECTIVE: The present study aims to investigate the roles of IL-18 in patients with idiopathic UIP and idiopathic NSIP. METHODS: We measured the serum and BAL fluid (BALF) levels of IL-18 and IFN-gamma in 22 patients with IIP (12 with UIP, 10 with NSIP) and 9 healthy volunteers. RESULTS: Lymphocyte proportions in BALF were significantly higher in NSIP than in UIP and healthy subjects. No significant differences were observed in the serum IL-18 levels of all subjects, while the BALF levels of IL-18 in patients with NSIP were significantly higher than in patients with UIP (p < 0.005) and in healthy subjects (p < 0.005). Among all subjects, the levels of IL-18 in BALF correlated significantly with those in serum and the lymphocyte proportions in BALF. The serum IFN-gamma levels of all subjects were below sensitivity, but there was significant reverse correlation between the levels of IFN-gamma and the lymphocyte proportions in BALF. CONCLUSION: The lymphocytosis in BALF of patients with idiopathic NSIP and a part of idiopathic UIP might be associated with the high levels of IL-18. CI - Copyright (c) 2005 S. Karger AG, Basel. FAU - Ishii, Hiroshi AU - Ishii H AD - Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan. FAU - Mukae, Hiroshi AU - Mukae H FAU - Kadota, Jun-ichi AU - Kadota J FAU - Fujii, Takeshi AU - Fujii T FAU - Abe, Koh AU - Abe K FAU - Ashitani, Jun-ichi AU - Ashitani J FAU - Kohno, Shigeru AU - Kohno S LA - eng PT - Comparative Study PT - Journal Article PL - Switzerland TA - Respiration JT - Respiration; international review of thoracic diseases JID - 0137356 RN - 0 (Antigens) RN - 0 (Antigens, Neoplasm) RN - 0 (Biomarkers) RN - 0 (Glycoproteins) RN - 0 (Interleukin-18) RN - 0 (MUC1 protein, human) RN - 0 (Mucin-1) RN - 0 (Mucins) RN - 0 (Pulmonary Surfactant-Associated Protein A) RN - 82115-62-6 (Interferon-gamma) SB - IM CIN - Respiration. 2005 Jan-Feb;72(1):28-9. PMID: 15753630 MH - Adult MH - Aged MH - Antigens/blood MH - Antigens, Neoplasm MH - Biomarkers/metabolism MH - Biopsy MH - Bronchoalveolar Lavage Fluid/*cytology/immunology MH - CD4-CD8 Ratio MH - Enzyme-Linked Immunosorbent Assay MH - Eosinophils/cytology MH - Female MH - Flow Cytometry MH - Fluorescent Antibody Technique, Direct MH - Glycoproteins/blood MH - Humans MH - Interferon-gamma/metabolism MH - Interleukin-18/immunology/*metabolism MH - Lung Diseases, Interstitial/immunology/*metabolism/pathology MH - Lymphocytosis/*immunology/pathology MH - Macrophages, Alveolar/cytology/immunology MH - Male MH - Middle Aged MH - Mucin-1 MH - Mucins MH - Neutrophils/cytology MH - Pulmonary Surfactant-Associated Protein A/blood EDAT- 2005/03/09 09:00 MHDA- 2005/06/01 09:00 CRDT- 2005/03/09 09:00 PHST- 2003/07/22 00:00 [received] PHST- 2004/06/07 00:00 [accepted] PHST- 2005/03/09 09:00 [pubmed] PHST- 2005/06/01 09:00 [medline] PHST- 2005/03/09 09:00 [entrez] AID - 83399 [pii] AID - 10.1159/000083399 [doi] PST - ppublish SO - Respiration. 2005 Jan-Feb;72(1):39-45. doi: 10.1159/000083399.