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ISSN: 2161-0460

Journal of Alzheimers Disease & Parkinsonism
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Review Article

Aluminum and Alzheimer ’ s Disease: An Update

Yasumasa Ohyagi1* and Katsue Miyoshi2

1Department of Neurological Therapeutics, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan

2Department of Neurology, Kushiro-Kita Hospital, Kushiro 084-0902, Japan

Corresponding Author:
Yasumasa Ohyagi
Department of Neurological Therapeutics
Graduate School of Medical Sciences Kyushu University
3-1-1 Maidashi, Higashi-ku
Fukuoka 812-8582, Japan
Tel: +81-92-642-5340
Fax: +81-92-642-5352
E-mail: [email protected]

Received date: March 04, 2013; Accepted date: July 05, 2013; Published date: July 10, 2013

Citation: Ohyagi Y, Miyoshi K (2013) Aluminum and Alzheimer’s Disease: An Update. J Alzheimers Dis Parkinsonism 3:118. doi: 10.4172/2161-0460.1000118

Copyright: © 2013 Ohyagi Y, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Alzheimer’s disease (AD) is the most common form of dementia in the elderly. AD is characterized by senile plaques and neurofibrillary tangles (NFTs) comprised of amyloid-β protein (Aβ) deposits and hyper-phosphorylated tau protein (p-tau), respectively. Oxidative stress-induced neuronal damage is also involved in AD pathogenesis. In the 1970s, studies showed increased levels of aluminum (Al) in the AD brain, and neurofibrillary changes upon its injection into the brain, thus leading to the suggestion that Al may be one of the major causes of AD. However, later reports contradicted this hypothesis as studies revealed that Al-induced neurofibrillary changes were different from NFT sin AD, and intake of high dose Al-containing antacid drugs did not induce AD. Other in vitro and in vivo studies found that Al was neurotoxic, and possibly promoting aggregation of Aβ and p-tau. Here, we review and verify the validity of Al pathogenesis in AD. Despite the multitude of studies, no direct evidence currently exists that specifically links Al with AD pathogenesis. Therefore, more advanced cohort studies are necessary to better understand the absolute risk of Al for AD, and to rigorously compare this link using other neurotoxic metals. Taken together, Al may be an environmental factor promoting cognitive impairment in AD patients, as well as other free radical-generating metal ions such as iron, copper and zinc.

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