SOAT1 and Alzheimer disease: Activated microglia can engulf Aβ and nerve fiber tangles and secrete a variety of proinflammatory cytokines and chemokines through the Janus kinase/signal transducer and activator of transcription (JAK/STAT) signaling pathway, such as nitric oxide, tumor necrosis factor‐α, and interleukin‐6 (IL‐6), leading to the inflammatory response of AD.22