Figure 3.
Autophagic degradation is impeded in Tsg101- and Vps24-depleted cells. HeLa cells stably expressing GFP-LC3 (green) were transfected with control (A), Vps24 (B), or Tsg101 (C) siRNA for 5 d and processed for immunofluorescence analysis. Cells were labeled with antibodies against p62 (red) and analyzed by confocal microscopy. Colocalization is indicated in yellow. Bar, 10 μm. (D) The total level of p62 and GFP-LC3 (normalized to control cells) and their degree of colocalization (% of total) in control and Tsg101- and Vps24-depleted cells were quantified using the Zeiss LSM 510 Meta software. 30 cells from three independent experiments were used for quantification. Error bars = SEM. (E) Western blot showing accumulation of LC3-II and p62 in HeLa cells depleted of Vps24 and Tsg101. p62 also accumulates in the insoluble fraction (bottom picture), indicating a shift to a more aggregated form upon depleted of Vps24 and Tsg101. (F) Western blot showing that LC3-II levels were similar in control and Vps24-depleted cells treated with Bafilomycin A.