Electron microscopic pictures of
HeLa-TetOn/Rab9S21N cells incubated for 2 h at 37°C with a
monovalent conjugate of ricin B-chain covalently coupled to HRP. A and
B are from control cells, whereas C-F are from cells treated with 5 mM
mβCD/chol for 30 min at 37°C before addition of the ricin B-chain
conjugate. In control cells, well-developed Golgi stacks (Go) and TGN
labeled by ricin B-chain conjugate are seen. In contrast, following
incubation with mβCD/chol, the size of distinct Golgi stacks is
strongly reduced and numerous small vesicles accumulate instead. EL,
ricin B-chain conjugate labeled endosomes/lysosomes; Nu, nucleus; Bar,
1 m.