FIGURE 1.
Localization of nCT, dmCT E112K/KDEV, dmCT E112K/KDGL, and mCT E112K in T84 cells after incubation. Cells were fixed and analyzed 4 h after the start of Alexa Fluor 488-conjugated nCT, dmCT E112K/KDEV, dmCT E112K/KDGL, and mCT E112K uptake. To identify the intracellular destination, colocalization with ER-Tracker Blue-White p-xylene-bispyridinium bromide, a marker for the ER, is shown in quasi-red (A), whereas BODIPY TR-cer-amide, a marker for the Golgi apparatus, is shown in red (B). The merged signals appear yellow. Typical image pictures are presented for each group. The yellow color area of nCT (■), mCT E112K (▥), dmCT E112K/KDEV (▨), and dmCT E112K/KDGL () were quantified with ImageJ software (C). The values represent the mean ± 1 SEM for six pictures from two different experiments. Each picture covers 12.96 mm2 of culture surface, which was equal to 262,144 pixels. *, p < 0.05; **, p < 0.01, when compared with nCT; †, p < 0.05; ††, p < 0.01, when compared with mCT E112K.