A Novel Protocol to Quantitatively Measure the Endocytic Trafficking of Amyloid Precursor Protein (APP) in Polarized Primary Neurons with Sub-cellular Resolution.

Alzheimer's disease's established primary trigger is β-amyloid (Aβ) (Mucke and Selkoe, 2012). The amyloid precursor protein (APP) endocytosis is required for Aβ generation at early endosomes (Rajendran and Annaert, 2012). APP retention at endosomes depends on its sorting for degradation in lysosomes ( Haass et al., 1992 ; Morel et al., 2013 ; Edgar et al., 2015 ; Ubelmann et al., 2017 ). The following endocytosis assay has been optimized to assess the amyloid precursor protein (APP) endocytosis and degradation by live murine cortical primary neurons ( Ubelmann et al., 2017 ).