Dataset Information

5-Caffeoylquinic Acid Ameliorates Cognitive Decline and Reduces A? Deposition by Modulating A? Clearance Pathways in APP/PS2 Transgenic Mice.

ABSTRACT: The accumulation of amyloid ? (A?) in the brain is a major pathological feature of Alzheimer's disease (AD). In our previous study, we demonstrated that coffee polyphenols (CPP) prevent cognitive dysfunction and A? deposition in the brain of an APP/PS2 transgenic mouse AD model. The underlying mechanisms, however, remain to be elucidated. Here, we investigated the effects of the chronic administration of 5-caffeoylquinic acid (5-CQA), the most abundant component of CPP, on cognitive dysfunction in APP/PS2 mice to identify the role of CPP in A? elimination. Relative to the untreated controls, the mice fed a 5-CQA-supplemented diet showed significant improvements in their cognitive function assessed by Y-maze and novel object recognition tests. Histochemical analysis revealed that 5-CQA substantially reduced A? plaque formation and neuronal loss in the hippocampi. Moreover, 5-CQA upregulated the gene encoding low-density lipoprotein receptor-related protein 1, an A? efflux receptor, and normalized the perivascular localization of aquaporin 4, which facilitates A? clearance along the paravascular pathway. These results suggest that 5-CQA reduces A? deposition in the brain by modulating the A? clearance pathways and ameliorating cognitive decline and neuronal loss in APP/PS2 mice. Thus, 5-CQA may be effective in preventing cognitive dysfunction in AD.

SUBMITTER: Ishida K

PROVIDER: S-EPMC7071270 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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5-Caffeoylquinic Acid Ameliorates Cognitive Decline and Reduces Aβ Deposition by Modulating Aβ Clearance Pathways in APP/PS2 Transgenic Mice.

Ishida Keiko K Misawa Koichi K Nishimura Hitomi H Hirata Tomoya T Yamamoto Masaki M Ota Noriyasu N

Nutrients 20200214 2

The accumulation of amyloid β (Aβ) in the brain is a major pathological feature of Alzheimer's disease (AD). In our previous study, we demonstrated that coffee polyphenols (CPP) prevent cognitive dysfunction and Aβ deposition in the brain of an APP/PS2 transgenic mouse AD model. The underlying mechanisms, however, remain to be elucidated. Here, we investigated the effects of the chronic administration of 5-caffeoylquinic acid (5-CQA), the most abundant component of CPP, on cognitive dysfunction ...[more]

PMID: 32075202

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Project description:BACKGROUND:Exposure to benzo(a)pyrene (BaP) was associated with cognitive impairments and some Alzheimer's disease (AD)-like pathological changes. However, it is largely unknown whether BaP exposure participates in the disease progression of AD. OBJECTIVES:To investigate the effect of BaP exposure on AD progression and its underlying mechanisms. METHODS:BaP or vehicle was administered to 4-month-old APPswe/PS1dE9 transgenic (APP/PS1) mice and wildtype (WT) mice for 2?months. Learning and memory ability and exploratory behaviors were evaluated 1?month after the initiation/termination of BaP exposure. AD-like pathological and biochemical alterations were examined 1?month after 2-month BaP exposure. Levels of soluble beta-amyloid (A?) oligomers and the number of A? plaques in the cortex and the hippocampus were quantified. Gene expression profiling was used to evaluate alternation of genes/pathways associated with AD onset and progression. Immunohistochemistry and Western blot were used to demonstrate neuronal loss and neuroinflammation in the cortex and the hippocampus. Treatment of primary neuron-glia cultures with aged A? (a mixture of monomers, oligomers, and fibrils) and/or BaP was used to investigate mechanisms by which BaP enhanced A?-induced neurodegeneration. RESULTS:BaP exposure induced progressive decline in spatial learning/memory and exploratory behaviors in APP/PS1 mice and WT mice, and APP/PS1 mice showed severer behavioral deficits than WT mice. Moreover, BaP exposure promoted neuronal loss, A? burden and A? plaque formation in APP/PS1 mice, but not in WT mice. Gene expression profiling showed most robust alteration in genes and pathways related to inflammation and immunoregulatory process, A? secretion and degradation, and synaptic formation in WT and APP/PS1 mice after BaP exposure. Consistently, the cortex and the hippocampus of WT and APP/PS1 mice displayed activation of microglia and astroglia and upregulation of inducible nitric oxide synthase (iNOS), glial fibrillary acidic protein (GFAP), and NADPH oxidase (three widely used neuroinflammatory markers) after BaP exposure. Furthermore, BaP exposure aggravated neurodegeneration induced by aged A? peptide in primary neuron-glia cultures through enhancing NADPH oxidase-derived oxidative stress. CONCLUSION:Our study showed that chronic exposure to environmental pollutant BaP induced, accelerated, and exacerbated the progression of AD, in which elevated neuroinflammation and NADPH oxidase-derived oxidative insults were key pathogenic events.

Dataset Information

5-Caffeoylquinic Acid Ameliorates Cognitive Decline and Reduces A? Deposition by Modulating A? Clearance Pathways in APP/PS2 Transgenic Mice.

Publications

5-Caffeoylquinic Acid Ameliorates Cognitive Decline and Reduces Aβ Deposition by Modulating Aβ Clearance Pathways in APP/PS2 Transgenic Mice.

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