Abstract:
STUDY OBJECTIVES:The Fas-Fas ligand (FasL) pathway is a representative system of apoptosis-signaling receptor molecules. We previously described that this pathway may play an important role in the pathogenesis of fibrosing lung diseases. In this study, we hypothesized that soluble form of Fas (sFas) and FasL (sFasL) may also be associated with this disorder. MEASUREMENTS AND RESULTS:We measured sFas and sFasL levels in BAL fluid (BALF) from patients with idiopathic pulmonary fibrosis (IPF), interstitial pneumonia associated with collagen vascular diseases (CVD-IP), and bronchiolitis obliterans organizing pneumonia (BOOP), using enzyme-linked immunosorbent assay. BALF from all patients was obtained before prednisolone therapy. sFasL levels were relatively increased in IPF patients (p = 0.084), and significantly increased in CVD-IP patients (p < 0.05) and BOOP patients (p < 0.05), compared with control subjects. BALF sFasL levels were elevated in the IPF or CVD-IP subgroups with an indication for prednisolone therapy, compared with those without an indication for therapy. The BALF sFasL level in IPF patients was correlated with the number of total cells and lymphocytes. The BALF sFasL level in BOOP patients was relatively or significantly correlated with the number of total cells or lymphocytes, respectively. The BALF sFas level was significantly increased in BOOP patients, but not in IPF or CVD-IP patients. CONCLUSIONS:We conclude that BALF sFasL levels may be associated with the accumulation of inflammatory cells and reflect the degree of lymphocyte alveolitis in IPF. The elevation of sFasL may be associated with the deterioration of IPF and CVD-IP. The elevation of the BALF sFas level may abrogate the cytotoxicity of FasL in BOOP patients, which may be associated with better prognosis of BOOP, compared with IPF or CVD-IP.
journal_name
Chestjournal_title
Chestauthors
Kuwano K,Kawasaki M,Maeyama T,Hagimoto N,Nakamura N,Shirakawa K,Hara Ndoi
10.1378/chest.118.2.451subject
Has Abstractpub_date
2000-08-01 00:00:00pages
451-8issue
2eissn
0012-3692issn
1931-3543pii
S0012-3692(15)51807-2journal_volume
118pub_type
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