Expression of PD-L1 and OX40L on blood DCs. Upper panel: expression (% positive blood DCs) of OX40L on blood mDCs (A) and PD-L1 on blood pDCs (B) of 21 never-smokers (Never-Smoker), 21 current smokers with normal lung function (Smoker) and 54 patients with COPD (COPD). Lowe panel: expression (% positive blood DCs) of OX40L on blood mDCs (C) and PD-L1 on blood pDCs (D) in those 27 COPD patients with less than 2 elevated markers of systemic inflammation (no systemic inflammation) and those 27 COPD patients with at least 2 elevated markers of systemic inflammation (systemic inflammation).
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