Alzheimer Disease/drug therapy; Hypericum/chemistry; Microglia/drug effects; Multidrug Resistance-Associated Proteins/metabolism; Phytotherapy; Plant Preparations/therapeutic use; Alzheimer Disease/complications; Alzheimer Disease/genetics; Alzheimer Disease/pathology; Amyloid beta-Peptides/metabolism; Amyloid beta-Peptides/pharmacology; Amyloid beta-Protein Precursor/genetics; Animals; Brain/drug effects; Brain/metabolism; Brain/pathology; Disease Models, Animal; Dose-Response Relationship, Drug; Gene Expression Regulation/drug effects; Maze Learning/drug effects; Mice; Mice, Transgenic; Peptide Fragments/metabolism; Peptide Fragments/pharmacology; Phagocytes/drug effects; Phloroglucinol/analogs & derivatives; Phloroglucinol/therapeutic use; Plant Preparations/chemistry; Plaque, Amyloid/drug therapy; Plaque, Amyloid/etiology; Terpenes/therapeutic use; Time Factors