BDNF and Alzheimer disease: Liposomes, polymeric micelles, dendrimers, magnetic nanoparticles, and quantum dots functionalized with NGF effectively deliver this neurotrophin both in neuronal cell culture and/or in animal model of AD leading to neurite outgrowth, diminution of cerebral Aβ accumulation, rescue in cholinergic functions, improved viability, and neuroprotection (Angelova et al., 2013; Zhao et al., 2016; Faustino et al., 2017; Marcus et al., 2018; Mitra et al., 2019; Tosi et al., 2020).