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Increased platelet binding to circulating monocytes in idiopathic pulmonary fibrosis.

Crooks, Michael; Fahim, Ahmed; Hart, Simon; Crooks, Michael G.; Morice, Alyn; Morice, Alyn H.; Hart, Simon P.


Michael Crooks

Ahmed Fahim

Simon Hart

Michael G. Crooks

Alyn Morice

Alyn H. Morice

Simon P. Hart


Purpose Idiopathic pulmonary fibrosis (IPF) is the most common idiopathic interstitial pneumonia and its prognosis is poor. Epidemiological evidence suggests an association of IPF with vascular disease and thrombotic tendency, which may be related to platelet activation. Methods Platelet–monocyte adhesion in peripheral blood was examined by flow cytometry in patients with IPF (n = 19), interstitial lung disease (ILD) other than IPF (n = 9), and control subjects without pulmonary fibrosis (n = 14). Expression of platelet activation markers P-selectin (CD62P), PSGL-1 (CD162), and CD40 ligand (CD40L) on leukocytes and platelets were studied. Plasma concentrations of soluble P-selectin and CD40L were measured by ELISA. Results Significantly elevated levels of platelet–monocyte binding were found in patients with IPF (35.6 ± 4.34 % [mean ± SEM]) compared with patients with non-IPF ILD (23.5 ± 3.68 %) and non-ILD control subjects (16.5 ± 2.26 %; P < 0.01). There was a trend towards increased divalent cation-independent platelet–monocyte binding in IPF (6.0 ± 0.77 % [mean ± SEM]) compared with non-IPF ILD (4.3 ± 1.38 %) and control subjects without ILD (3.1 ± 1.75 %; P = 0.058). There was no differential surface expression of platelet activation markers on subsets of leukocytes or platelets. Plasma concentrations of CD40L and soluble P-selectin did not differ between IPF and control subjects. Platelet–monocyte binding had no significant correlation with percent predicted TLco or FVC. Conclusions Platelet–monocyte binding is increased in IPF, suggesting increased platelet activation. This conjugation is predominantly calcium-dependent, but there may be more calcium-independent adhesion in IPF. These findings support further research into the role of platelet activation in IPF.

Journal Article Type Article
Publication Date 2014-04
Journal Lung
Print ISSN 0341-2040
Electronic ISSN 1432-1750
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 192
Issue 2
Pages 277-284
APA6 Citation Fahim, A., Crooks, M. G., Morice, A. H., & Hart, S. P. (2014). Increased platelet binding to circulating monocytes in idiopathic pulmonary fibrosis. Lung, 192(2), 277-284.
Keywords Idiopathic pulmonary fibrosis, Interstitial lung disease, Monocytes, Platelets, Platelet-monocyte complexes
Publisher URL
Additional Information This is a description of an article published in Lung, 2014, v.192 issue 2. It is not available in this repository.

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