Abstract
Background
Sarcoidosis is a disease characterized by granulomatous lesions involving multiple organ systems. The etiology of sarcoidosis remains unknown, and reliable biomarkers have not been identified. Tenascin-C is an extracellular matrix molecule expressed during wound healing in various tissues. The present study aimed to investigate the role of tenascin-C in sarcoidosis.
Methods
Enzyme-linked immunosorbent assays were used to measure tenascin-C levels in serum and bronchoalveolar lavage fluid (BALF) from 31 patients with sarcoidosis and 15 healthy individuals. Relationships between tenascin-C concentrations in BALF and serum samples and clinical parameters in patients with sarcoidosis were evaluated.
Results
BALF tenascin-C levels were significantly higher in patients with sarcoidosis than in healthy individuals, but serum levels were no different. BALF tenascin-C levels showed positive correlations with serum lactic dehydrogenase levels and the ratio of lymphocytes in BALF. BALF tenascin-C levels were also higher in patients with parenchymal infiltration on chest radiographs than in those without.
Conclusions
The present results demonstrated that the BALF tenascin-C level was correlated with pulmonary infiltrates on chest radiographs in patients with sarcoidosis. Although measurement of serum tenascin-C levels has a limited role and measurement of BALF tenascin-C levels might be impractical, tenascin-C in the lung might play a role in the pathogenesis of sarcoidosis. Further studies are necessary to determine the role of BALF tenascin-C in sarcoidosis.
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Acknowledgments
The authors thank Mr. Atsushi Yokoyama (Nagasaki University Hospital) for excellent technical assistance. This study was supported in part by KAKENHI, Nonprofit Organization Aimed to Support Community Medicine Research in Nagasaki, and a grant to the Diffuse Lung Diseases Research Group from the Ministry of Health, Labour and Welfare, Japan.
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The authors have no conflicts of interest or financial ties to disclose.
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Fujita, H., Sakamoto, N., Ishimatsu, Y. et al. Elevated Tenascin-C Levels in Bronchoalveolar Lavage Fluid of Patients with Sarcoidosis. Lung 190, 537–543 (2012). https://doi.org/10.1007/s00408-012-9400-1
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DOI: https://doi.org/10.1007/s00408-012-9400-1