Figure 6From: Neurotrophins regulate ApoER2 proteolysis through activation of the Trk signaling pathwayPI3K activity regulates the constitutive levels of ApoER2 CTF but is not involved in ApoER2 shedding induced by NGF. (A) PC12-ApoER2 cells were serum-starved and pre-treated with 10 μM DAPT and 50 μM LY294002 or 5 μM ZSTK474 for 1 h. Then, the cells were incubated with 100 ng/mL NGF for 2 h. ApoER2 and p75NTR were recognized using antibodies directed against their intracellular regions. The activation of PI3K, induced by NGF, was determined by detection of phospho-AKT. α-tubulin is shown as a loading control. The blot levels of ApoER2 CTF (B and C) and of p75NTR CTF (D and E) were normalized to the loading control α-tubulin and plotted as the average ± SD of three independent experiments. One way ANOVA, Holm-Sidak post-hoc test, *P < 0.01; N.S, not significant.Back to article page