Lipoic acid as a novel treatment for Alzheimer's disease and related dementias

Holmquist, Lina, Stuchbury, Grant, Berbaum, Katrin, Muscat, Sonja, Young, Simon, Hager, Klaus, Engel, Jürgen, and Münch, Gerald (2007) Lipoic acid as a novel treatment for Alzheimer's disease and related dementias. Pharmacology and Therapeutics, 113 (1). pp. 154-164.

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Abstract

Alzheimer's disease (AD) is a progressive neurodegenerative disorder that destroys patient memory and cognition, communication ability with the social environment and the ability to carry out daily activities. Despite extensive research into the pathogenesis of AD, a neuroprotective treatment – particularly for the early stages of disease – remains unavailable for clinical use. In this review, we advance the suggestion that lipoic acid (LA) may fulfil this therapeutic need. A naturally occurring precursor of an essential cofactor for mitochondrial enzymes, including pyruvate dehydrogenase (PDH) and α-ketoglutarate dehydrogenase (KGDH), LA has been shown to have a variety of properties which can interfere with pathogenic principles of AD. For example, LA increases acetylcholine (ACh) production by activation of choline acetyltransferase and increases glucose uptake, thus supplying more acetyl-CoA for the production of ACh. LA chelates redox-active transition metals, thus inhibiting the formation of hydroxyl radicals and also scavenges reactive oxygen species (ROS), thereby increasing the levels of reduced glutathione. Via the same mechanisms, downregulation redox-sensitive inflammatory processes is also achieved. Furthermore, LA can scavenge lipid peroxidation products such as hydroxynonenal and acrolein. The reduced form of LA, dihydrolipoic acid (DHLA), is the active compound responsible for most of these beneficial effects. R-α-LA can be applied instead of DHLA, as it is reduced by mitochondrial lipoamide dehydrogenase, a part of the PDH complex. In this review, the properties of LA are explored with particular emphasis on how this agent, particularly the R-α-enantiomer, may be effective to treat AD and related dementias.

Item ID: 2463
Item Type: Article (Refereed Research - C1)
Keywords: Alzheimer's disease; reactive oxygen species; Lipoic acid
Additional Information:

ISSN: 0163-7258
Date Deposited: 21 Jul 2009 05:29
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1109 Neurosciences > 110999 Neurosciences not elsewhere classified @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920111 Nervous System and Disorders @ 100%
Citation Count from Web of Science Web of Science 92
Downloads: Total: 2
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