Cell culture
RAW264.7 macrophages were obtained from the cell bank of the Chinese Academy of Sciences (Shanghai, China). J774A.1 macrophages were purchased from BeNa Culture Collection (Jiangsu, China). Human THP-1 and HEK293T cells were purchased from American Type Culture Collection (Manassas, VA, USA). Cells were cultured in DMEM or RPMI 1640 supplemented with 10% FBS. Cells were maintained at 37 °C under a humidified atmosphere of 5 % CO2 in an incubator.