Oral Administration of Synthetic Retinoid Am80 (Tamibarotene) Decreases Brain β-Amyloid Peptides in APP23 Mice

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The purpose of this study is to investigate whether a synthetic retinoid Am80 (tamibarotene) exhibits any improving effects on amyloid precursor protein (APP)23 mice, a model of Alzheimers disease. Am80 was orally administered in feed to 20-week (5-month)-old APP23 mice at a dose of 0 (control) or 0.5 mg/kg/d for 14 weeks. The Am80 treatment reduced significantly the insoluble Aβ levels in brain, in particular Aβ42, while it gave no apparent effects on the soluble Aβ levels. The results suggest that oral administration of Am80 may have potency to reduce the extracellular Aβ42 of insoluble and possibly oligomeric or protofibril forms, which are related to the cause and/or progression of Alzheimers disease. The Am80 treatment showed no significant effect on spatial learning and memory of APP23 mice by Morris water maze analysis. The main reason for the absence of significance seems based on the large deviation and some mice both in the treated and the non-treated groups would neither swim nor make efforts to reach the platform.