Figure 7.

Surface expression of GPI-anchored and transmembrane proteins after cholesterol depletion. (A) FRT cells expressing PLAP, NTR-PLAP, gD1-DAF, p75NTR, or PLAP-PS321 were grown on filters and treated with mevinolin (Mev.; 10 μM) for 48 h and M-β-CD (10 mM) for 60 min. Cells were then pulse labeled for 30 min, chased for 2 h, and biotinylated as usual. (B) Amounts of labeled proteins were quantified in three independent experiments and are shown as means ± SD. Hatched bars represent apical (Ap) proteins, and black bars represent basolateral (BL) proteins. Removal of cholesterol does not alter the surface expression of apical and basolateral GPI-anchored and transmembrane proteins.