As described previously [9 (link), 10 (link)], PBMCs of COPD patients (administrated at the Second Affiliated Hospital of Xi’an Jiao Tong University, Xi’an, China) were collected via lymphocyte separation medium (Sigma, Shanghai, China). The resulting PBMCs were cultured in DMEM plus 10% FBS, and necessary supplements [30 (link)]. Experiments and protocols requiring human samples were approved by the Ethics Committee and Internal Review Board of Xi’an Jiao Tong University. Written-informed consent was provided by each patient.
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