Alzheimer's disease(AD)is characterized by two pathological lesions: intracellular neurofibrillary tangles and extracellular amyloid deposits. Recently researchers accept the amyloid hypothesis which states that accumulation of amyloid-beta protein (Aβ) in the brain is the primary causal factor driving AD pathogenesis. Since estrogen has been demonstrated to be able to modulate the metabolism of amyloid-beta precursor protein, reduce the generation of Aβ, ameliorate the injury caused by inflammation and oxi...