AGEs RAGE Pathways: Alzheimer’s Disease

Abstract

Neurofibrillary tangles and plaques containing tau serve as the biological markers for Alzheimer disease (AD) and pathogenesis is widely believed to be driven by the production and deposition of the β-amyloid peptide (Aβ). The β-amyloid peptide (Aβ) that results from the modification of the amyloid precursor protein (APP) by builds up as amyloid deposits in neuronal cells. Thus, a protein misfolding process is involved in the production of amyloid. In a native, aqueous buffer, amyloid fibrils are usually exceedingly stable and nearly insoluble. Although amyloid is essentially a foreign substance made of self-proteins, the immune system has difficulty identifying and eliminating it as such for unknown reasons. While the amyloidal deposit may have a direct role in the disease mechanism in some disease states involving amyloidal deposition, this is not always the case. Current research has shown that PS1 (presenilin 1) and BACE (beta-site APP-cleaving enzyme) have – and -secretase activity that increases β-amyloid peptide (Aβ). Wealth of data has shown that oxidative stress and AD are closely connected that causes the death of neuronal cells by producing reactive oxygen species (ROS). Additionally, it has been demonstrated that advanced glycation end products (AGEs) and β-amyloidal peptide (Aβ) together increase neurotoxicity. The objective of this review is to compile the most recent and intriguing data of AGEs and receptor for advanced glycation end products (RAGE) pathways which are responsible for AD.

Key words

neurofibrillary tangles - AGEs - RAGE - Alzheimer disease - β-amyloid peptide

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