BDNF and Alzheimer disease: This treatment reduced the hippocampal amyloid plaque number, increased protein expression of the ACh–synthesizing enzyme, choline acetyltransferase (CHAT), and the levels of a cholinergic differentiating factor, BMP9, and of trophic factors NGF, BDNF, NT3 and IGF1, as well as a marker of neurogenesis, doublecortin (DCX), indicating that IGF2 exhibits efficacy as an AD treatment in this model.