In this study, each siRNA is encapsulated in LNP (cationic lipid-A: PEG2000-DMPE: DOPE = 47.8: 5.18: 47.1 molar percent).With the neutral lipid for the LNP is
DOPE
, LNP exerts knock-down (KD) effecton macrophages and DCs and Liposome-containing
DOPE
shows fusogenicity.LNP/siRNA significantly suppresses CD45 protein expression at an inhibition rate of 30% on macrophages and DCs but not on monocytes, neutrophils, plasmacytoid DCs, or B cells.LNP has the potential to be an efficient siRNA delivery system not only for murine but also for human macrophages and DCs.