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Sputum cytokine levels in patients undergoing hematopoietic SCT and comparison with healthy subjects and COPD: a pilot study

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Abstract

Patients undergoing hematopoietic SCT (HSCT) display an airway neutrophilic inflammation before transplantation that persists over the years. In this study, we have investigated the cytokine profile over a period of 1 year in the sputum supernatant of patients who underwent HSCT. We have measured sputum supernatant levels of TNF-α, TGF-β1, IL-4, IL-5, IL-6, IL-8, IL-10, IL-13, IL-17 and IFN-γ in 49 HSCT patients and compared the results with those found in 40 chronic obstructive pulmonary disease (COPD) and 54 healthy subjects matched for age. Compared with healthy subjects, before transplantation, HSCT patients exhibited raised levels of IL-6 (P<0.001) and IL-8 (P<0.05) while the other cytokines were generally poorly detectable. This picture was rather similar to that seen in COPD even if cytokine levels were much greater in the latter, with IL-8 being significantly greater in COPD than in HSCT patients (P<0.0001). In the 1 year following transplantation, sputum IL-6 and IL-8 did not differ from those in healthy subjects. Overall in HSCT patients, sputum IL-8 and IL-6 correlated with sputum neutrophil counts (r=0.4, P<0.0001; r=0.42, P<0.0001, respectively). In conclusion, sputum IL-6 and IL-8 may play a role in neutrophilic airway inflammation seen in patients undergoing HSCT.

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Acknowledgements

We would like to thank the lung function department of the CHU of Liege for their help in the collection of the data. The study was financially supported by TELEVIE (Grant F.N.R.S. 7.4.642.09.F) associated with the Fonds National de la Recherche Scientifique (FNRS) Belgium, PAI 6/35 and PAI 7/30 and Fonds Leon Fredericq.

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Correspondence to C Moermans.

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Supplementary Information accompanies this paper on Bone Marrow Transplantation website

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Moermans, C., Bonnet, C., Willems, E. et al. Sputum cytokine levels in patients undergoing hematopoietic SCT and comparison with healthy subjects and COPD: a pilot study. Bone Marrow Transplant 49, 1382–1388 (2014). https://doi.org/10.1038/bmt.2014.164

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