Murine DCs were surface stained for 30 mins in the dark at 4°C with fluorescently labelled antibodies against
CD11c (clone N418, BD),
CD4 (clone RM4-5, BD),
CD8α (clone 53–6.7, BD),
GR1 (clone RB6.8C5, BD),
B220 (clone RA3.6B2, BD), CD40 (Biolegend, California, USA),
MHC class-I (Biolegend) and
MHC class-II (Biolegend). For intracellular lipid quantification, cells were incubated for 15 mins at 4°C in the dark with
BODIPY 493/503 (Invitrogen).
For staining molecules associated with lipid uptake, cells were fixed in 1%
paraformaldehyde (Sigma-Aldrich) and permeabilised with 0.1%
saponin (Sigma-Aldrich). Cells were incubated with fluorescently labelled
anti-CD36 (Biolegend),
anti-CD68 (Biolegend), LRP-1 (Santa Cruz, California, USA), LPL (Abcam, Cambridge, UK) and
VLDLr (Abcam) in the dark for 30 mins at 4°C. Before staining, mouse IgG
1 antibodies (LPL and
VLDLr) were directly conjugated to zenon reagents (Invitrogen) as per manufacturer’s instructions. Following LRP-1 staining, cells were sequentially incubated with anti-goat biotin (Dako, California, USA) and
streptavidin-V500 (BD) in the dark for 30 mins at 4°C.
Following staining, samples were washed twice and resuspended in FACS buffer for acquisition on a
FACSCanto II (BD) followed by analysis using FlowJo V10 software (Treestar, Oregon, USA). Isotype-matched antibodies were used as controls.
Gardner J.K., Mamotte C.D., McGonigle T., Dye D.E., Jackaman C, & Nelson D.J. (2014). Lipid-laden partially-activated plasmacytoid and CD4−CD8α+ dendritic cells accumulate in tissues in elderly mice. Immunity & Ageing : I & A, 11, 11.