Macrophages differentiated from PBMCs on cover slips were treated with RBCEVs and fixed at different timepoints with 10% formalin. The cells were then washed with PBS containing 2% FBS prior to permeabilization with 0.1% Triton X‐100. The cells were then incubated with the appropriate primary antibody against markers for EEA, late endosomes, or lysosomes‐late endosomes (i.e., EEA, LBPA and LAMP1, respectively), followed by incubation with the appropriate secondary antibody (AlexaFluor 488/594/647‐conjugated mouse I) prior to imaging with the
Olympus FV3000 confocal microscope (Olympus Corporation). Primary antibodies used for immunofluorescent staining were
anti‐LAMP1 antibody (Abcam, Cat #: ab25630 or Cell Signaling Technology, Cat #: 9091S), anti‐EEA antibody (Cell Signalling Technology, Cat #: 2411S),
anti‐LBPA (Sigma‐Aldrich, Cat #: MABT837), anti‐SLC48A1 (HRG1) (Thermofisher Scientific, Cat #: PA5‐42191), and anti‐human BAND 3 (Santa Cruz Biotechnology, Cat #: sc‐133190)
Pham T.T., Le A.H., Dang C.P., Chong S.Y., Do D.V., Peng B., Jayasinghe M.K., Ong H.B., Hoang D.V., Louise R.A., Loh Y., Hou H.W., Wang J, & Le M.T. (2023). Endocytosis of red blood cell extracellular vesicles by macrophages leads to cytoplasmic heme release and prevents foam cell formation in atherosclerosis. Journal of Extracellular Vesicles, 12(8), 12354.