Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-017-19105-z
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Funding
- National Health Research Institutes [NHRI-102A1-PDCO-03010201]
- National Science Council [NSC 102-2314-B-037-052]
- Ministry of Health [EODOH01]
- Kaohsiung Medical University Aim for the Top Universities Grant [KMU-TP-103-A03, KMU-TP105A02, KMU-TP104A10]
- Kaohsiung Medical University Hospital Research Foundation [KMUH102-2T04]
- Academic Sinica Taiwan [BM-102021170]
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CD14(+) monocytes contain precursors for macrophages and fibrocytes, known to be involved in regulating airway remodeling in human asthma and distinguishable by the PM-2K marker. We sought to identify circulating subsets of PM-2K(+) macrophage-like cells and evaluate their relationships to lung function, severity and control status. Circulating PM-2K(+) macrophage-like cells and fibrocytes could be identified and distinguished between normal individuals (N = 152) and asthmatic subjects (N = 133) using multi-parametric flow cytometry. PM-2K(+) macrophage-like cells were found to be significantly lower in asthmatic subjects, particularly noted for the CD14(-)PM-2K(+) subset and PM-2K(+) CCR7(-)CD86(+) cells in subjects with poor lung function (FEV%/FVC% < 80%) as compared to those of normal subjects and asthmatics with normal lung function, whereas the frequency of fibrocytes was higher in asthmatics and the CCR7-CD86(+) subset distribution was significantly different in subjects with varying severity. Moreover, exogenous transforming growth factor beta 1 (TGF-beta 1) was found to inhibit the generation of PM-2K(+) macrophage-like cells, but promote the growth of fibrocytes, from CD14(+) monocytes, and monocyte-derived TGF-beta 1 was found to correlate with the lung function, severity and control status in asthmatic patients. Collectively, aberrant differentiation of monocytes into PM-2K(+) macrophage-like cell subsets and fibrocytes, together with increased monocyte-derived TGF-beta 1, characterized patients with severe asthma.
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