A Self-Microemulsifying Formulation of Oxyresveratrol Prevents Amyloid Beta Protein-Induced Neurodegeneration in Mice

Abstract

The polyphenol compound, oxyresveratrol (OXY) possesses potent antioxidant and neuroprotective properties of potential utility in the treatment of Alzheimerʼs disease. However, the low oral bioavailability limits its neuroprotective effect and clinical application. The neuroprotective effect of orally administered OXY-loaded self-microemulsifying drug delivery system (OXY-SMEDDS) was compared with free OXY in vivo. Mice were orally administered either free OXY or OXY-SMEDDS once daily at a dose of 90, 180, or 360 mg/kg for 14 d. Mice received a single intracerebroventricular injection of the neurotoxic amyloid β (Aβ)_{25 – 35} peptide at day 8 during oral treatment. The OXY-SMEDDS formulation resulted in four-times reduction of the free OXY dose required for prevention of neurotoxicity effects due to Aβ _{25 – 35} peptide as demonstrated by a significant decline in behavior impairments, lipid oxidation levels, and neuronal cell loss in all hippocampal subfields (p < 0.0001). These results indicate the potential of OXY-SMEDDS by oral delivery to improve the efficacy of this compound in the treatment of Alzheimerʼs disease.

Key words

Alzheimerʼs disease - neuroprotection - oxyresveratrol - oral delivery - self-microemulsifying drug delivery systems - bioavailability - Artocarpus lacucha - Moraceae

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