Abstract
Alzheimers disease (AD) is the most common form of dementia. Recently, a number of epidemiological studies have shown that some dietary factors such as low antioxidants and vitamins intake could increase the risk of AD. In the opposite, diets rich in unsaturated fatty acids, in polyphenols, vitamins and antioxidants were identified as preventive factors. Several studies have reported that adherence to the Mediterranean diet (MeDi) was associated with a reduction in incidence of dementia. The beneficial effect of MeDi may be the result of the association of some individual and nonidentified food components and high consumption of olive oil. In this study we have investigated the protective effects of two components of olive oil, tyrosol (Tyr) and hydroxytyrosol (OH-Tyr), against Aβ-induced toxicity. In cultured neuroblastoma N2a cells, we found that Aβ25-35 (100 μg/ml) treatment induced a decrease of glutathione (GSH), and the activation of the transcription factor NF-κB and cell death. Our results demonstrated that the number of cell death decreased when cells were co-treated with Aβ and Tyr or OH-Tyr. However, neither of these phenolic compounds was able to prevent the decrease of GSH induced by H2O2 or Aβ. We found that the increase in the nuclear translocation of the NF-κB subunits after Aβ exposure was attenuated in the presence of Tyr or OH-Tyr. These results identified two individual food components of the MeDi as neuroprotective agent against Aβ and their potential involvement in the beneficial effect of the MeDi for the prevention of AD.
Keywords: Antioxidants, phenolic compounds, Alzheimer's disease, NF-κB, glutathione, NF-kB, radical-mediated damages, neuronal loss, AD pathology, astrocytes, fibrillar form
Current Alzheimer Research
Title: Tyrosol and Hydroxytyrosol Two Main Components of Olive Oil, Protect N2a Cells Against Amyloid-β-Induced Toxicity. Involvement of the NF-κB Signaling
Volume: 8 Issue: 5
Author(s): C. St-Laurent-Thibault, M. Arseneault, F. Longpre and C. Ramassamy
Affiliation:
Keywords: Antioxidants, phenolic compounds, Alzheimer's disease, NF-κB, glutathione, NF-kB, radical-mediated damages, neuronal loss, AD pathology, astrocytes, fibrillar form
Abstract: Alzheimers disease (AD) is the most common form of dementia. Recently, a number of epidemiological studies have shown that some dietary factors such as low antioxidants and vitamins intake could increase the risk of AD. In the opposite, diets rich in unsaturated fatty acids, in polyphenols, vitamins and antioxidants were identified as preventive factors. Several studies have reported that adherence to the Mediterranean diet (MeDi) was associated with a reduction in incidence of dementia. The beneficial effect of MeDi may be the result of the association of some individual and nonidentified food components and high consumption of olive oil. In this study we have investigated the protective effects of two components of olive oil, tyrosol (Tyr) and hydroxytyrosol (OH-Tyr), against Aβ-induced toxicity. In cultured neuroblastoma N2a cells, we found that Aβ25-35 (100 μg/ml) treatment induced a decrease of glutathione (GSH), and the activation of the transcription factor NF-κB and cell death. Our results demonstrated that the number of cell death decreased when cells were co-treated with Aβ and Tyr or OH-Tyr. However, neither of these phenolic compounds was able to prevent the decrease of GSH induced by H2O2 or Aβ. We found that the increase in the nuclear translocation of the NF-κB subunits after Aβ exposure was attenuated in the presence of Tyr or OH-Tyr. These results identified two individual food components of the MeDi as neuroprotective agent against Aβ and their potential involvement in the beneficial effect of the MeDi for the prevention of AD.
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St-Laurent-Thibault C., Arseneault M., Longpre F. and Ramassamy C., Tyrosol and Hydroxytyrosol Two Main Components of Olive Oil, Protect N2a Cells Against Amyloid-β-Induced Toxicity. Involvement of the NF-κB Signaling, Current Alzheimer Research 2011; 8 (5) . https://dx.doi.org/10.2174/156720511796391845
DOI https://dx.doi.org/10.2174/156720511796391845 |
Print ISSN 1567-2050 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5828 |
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Aims and Scope: Introduction: Alzheimer's disease (AD) poses a significant global health challenge, with an increasing prevalence that demands concerted efforts to advance our understanding and strategies for prevention, diagnosis, treatment, and rehabilitation. This thematic issue aims to bring together cutting-edge research and innovative approaches from multidisciplinary perspectives to address ...read more
Current updates on the Role of Neuroinflammation in Neurodegenerative Disorders
Neuroinflammation is an invariable hallmark of chronic and acute neurodegenerative disorders and has long been considered a potential drug target for Alzheimer?s disease (AD) and dementia. Significant evidence of inflammatory processes as a feature of AD is provided by the presence of inflammatory markers in plasma, CSF and postmortem brain ...read more
Deep Learning for Advancing Alzheimer's Disease Research
Alzheimer's disease (AD) poses a significant global health challenge, with an increasing number of individuals affected yearly. Deep learning, a subfield of artificial intelligence, has shown immense potential in various domains, including healthcare. This thematic issue of Current Alzheimer Research explores the application of deep learning techniques in advancing our ...read more
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Dementia affects 18 million people worldwide. Dementia is a syndrome of symptoms caused by brain disease, usually chronic or progressive, clinically characterized by multiple impairments of higher cortical functions such as memory, thinking, orientation, and learning. In addition, in the course of dementia, cognitive deficits are observed, which often hinder ...read more
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