AD is the most common dementia occurs among the elderly people. It is a progressive and neurodegenerative disorder affects regions of the brain that control cognition,memory, language, speech and awareness [2,3]. The two major pathological hallmarks of AD are the progressive loss of cholinergic neural transmission, formation of a beta-amyloid plaques (Aβ-plaques) that forms senile plaques (SPs) and neurofibrillary tangles (NFTs) of hyperphosphorylated tau protein [4,5]. Hence, two hypotheses including cholinergic and β-amyloid [6-8] were developed to interpret this phenomena, which, in essence, states that the cognitive decline in Alzheimer’s
disease is due (at least in part) to a loss of cholinergic neurotransmission [9] and the deposition beta-amyloid protein which is toxic to the neuron system. Anti-Aβ therapies are thought to be a pivotal strategy for the cure of AD [10,11].