textcopyright 2017, Company of Biologists Ltd. All rights reserved. The human A$42 peptide is associated with Alzheimer's disease through its deleterious effects in neurons. Expressing the human peptide in adult Drosophila in a tissue- and time-controlled manner, we show that A$42 is also toxic in non-neural cells, neurosecretory and epithelial cell types in particular. This form of toxicity includes the aberrant signaling by Wingless morphogen leading to the eventual activation of Caspase 3. Preventing Caspase 3 activation by means of p53 keeps epithelial cells from elimination but maintains the A$42 toxicity yielding more severe deleterious effects to the organism. Metabolic profiling by nuclear magnetic resonance (NMR) of adult flies at selected ages post A$42 expression onset reveals characteristic changes in metabolites as early markers of the pathological process. All morphological and most metabolic features of A$42 toxicity can be suppressed by the joint overexpression of PI3K.
- Amyloid $
- Epithelial cells