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Wang, Xiaoyun; Zhang, Duo; Higham, Andrew; Wolosianka, Sophie; Gai, Xiaoyan; Zhou, Lu; Petersen, Hans; Pinto-Plata, Victor; Divo, Miguel; Silverman, Edwin K; Celli, Bartolome; Singh, Dave; Sun, Yongchang; Owen, Caroline A
Respiratory research, 07/2020, Letnik: 21, Številka: 1Journal Article
A disintegrin and metalloproteinase domain-15 (ADAM15) is expressed by activated leukocytes, and fibroblasts in vitro. Whether ADAM15 expression is increased in the lungs of COPD patients is not known. ADAM15 gene expression and/or protein levels were measured in whole lung and bronchoalveolar lavage (BAL) macrophage samples obtained from COPD patients, smokers, and non-smokers. Soluble ADAM15 protein levels were measured in BAL fluid (BALF) and plasma samples from COPD patients and controls. Cells expressing ADAM15 in the lungs were identified using immunostaining. Staining for ADAM15 in different cells in the lungs was related to forced expiratory volume in 1 s (FEV ), ratio of FEV to forced vital capacity (FEV /FVC), and pack-years of smoking history. ADAM15 gene expression and/or protein levels were increased in alveolar macrophages and whole lung samples from COPD patients versus smokers and non-smokers. Soluble ADAM15 protein levels were similar in BALF and plasma samples from COPD patients and controls. ADAM15 immunostaining was increased in macrophages, CD8 T cells, epithelial cells, and airway α-smooth muscle (α-SMA)-positive cells in the lungs of COPD patients. ADAM15 immunostaining in macrophages, CD8 T cells and bronchial (but not alveolar) epithelial cells was related inversely to FEV and FEV /FVC, but not to pack-years of smoking history. ADAM15 staining levels in airway α-SMA-positive cells was directly related to FEV /FVC. Over-expressing ADAM15 in THP-1 cells reduced their release of matrix metalloproteinases and CCL2. These results link increased ADAM15 expression especially in lung leukocytes and bronchial epithelial cells to the pathogenesis of COPD.
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