A,B) Micrographs of macrophages expressing control (A) or Vps33B shRNA (B) visualize TLR4-positive endosomes and the indicated Rabs or dextran preloaded into lysosomes, following LPS stimulation chases for the indicated times. Scale bar: 10 µm.
C–F) Quantification of the fraction of TLR4 colocalizing with the indicated Rabs or dextran-labeled lysosomes at different times after LPS stimulation. Note that the lower colocalization of TLR4 with lysosomes at 120 min in control macrophages primarily reflects the low amounts of TLR4 remaining in these cells. All data here are representative of 3 independent experiments.