Dl-3-n-butylphthalide-induced upregulation of antioxidant defense is involved in the enhancement of cross talk between CREB and Nrf2 in an Alzheimer's disease mouse model

Neurobiology of Aging
Chun-Yan WangJian-Hui Cai

Abstract

Synapse impairment in the Alzheimer's disease (AD) brain is an early event leading to cognitive dysfunction. Most oxidative stress localizes to the synapse, and synapse loss is the basis of cognitive decline in AD. Dl-3-n-butylphthalide (Dl-NBP), a small molecule compound has been shown to ameliorate oxidative stress. We evaluated the effects of a 5-month oral delivery with Dl-NBP on oxidative stress and cognitive function in APP/PS1 transgenic mice. Dl-NBP treatment reduced oxidative stress in the APP/PS1 mouse brain and alleviated learning and memory deficits. Dl-NBP supplementation meliorated synaptic plasticity, diminished soluble amyloid beta and amyloid beta oligomer in the APP/PS1 mouse brain. Dl-NBP administration caused an increase of cyclic adenosine monophosphate-response element binding protein (CREB)-binding protein (CBP)-associated Ser133-phosphorylated CREB (p-CREB) protein. Chromatin immunoprecipitation analysis revealed that Dl-NBP increased the recruitment of CBP to the promoters of best-characterized genes downstream of nuclear factor erythroid 2-related factor 2, nicotinamide adenine dinucleotide phosphate (NADPH) quinone oxidoreductase 1, and γ-glutamylcysteine synthetase modifier subunit. We demonstrate th...Continue Reading

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