CD206 upregulation in monocytes within whole blood cultures correlates with lung function in Cystic Fibrosis: a pilot study
Martinez-Pomares, L.; Singh, S.; Longmate, J.; Onion, D.; Williams, P.; Camara, M.; Smyth, A. R.; Barr, H.
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Chronic inflammation dominates disease pathogenesis in Cystic Fibrosis (CF) and there is a need to characterise CF immunity. Whole blood cultures offer a cost-effective and non-invasive approach to investigate immune responses within the host environment. Here we used whole blood cultures to investigate the differentiation potential of monocytes (CD45+CD14+ cells) in CF (N=10) and controls (N=8) in the presence and absence of exogenous macrophage-colony stimulatory factor (M-CSF) or granulocyte-macrophage (GM)-CSF with and without interleukin (IL)-4. In CF and control cultures, CD45+CD14+ cells upregulated HLA-DR expression in all instances, and increased CD206 in the presence of GM-CSF with and without IL-4, and CD209 in the presence of GM-CSF and IL-4. In CF, we consistently observed reduced upregulation of CD206 in response to GM-CSF and a positive correlation between CD206 expression and lung function (FEV1). This was unique to cultured monocytes, and not seen with any other marker. These results highlight the potential of whole blood cultures to reveal cellular characteristics in differentiating monocytes related to clinical parameters that could guide the identification of novel biomarkers in CF.
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