The U937 cells were treated with 10 μg/mL Dil-ox-LDL in RPMI 1640 medium including 10% FCS at 37 °C in 5% CO2 for 18 h [25 (link),32 (link),36 (link)]. After twice washing with PBS gently, immunofluorescence was observed using Keyence BZ-X710 microscope and analyzed with the Keyence BZ-X710 software (Osaka, Japan). The quantification of fluorescent intensity of red color per cells was calculated as described previously [25 (link),32 (link),36 (link)].
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