Reactive metabolites and AGE/RAGE-mediated cellular dysfunction affect the aging process–a mini-review

TH Fleming, PM Humpert, PP Nawroth, A Bierhaus - Gerontology, 2011 - karger.com
TH Fleming, PM Humpert, PP Nawroth, A Bierhaus
Gerontology, 2011karger.com
Aging is a dynamic process in which its rate and subsequent longevity of an organism are
dependent upon the balance between the reactive intermediates of normal cellular
metabolism and the ability of the body to reduce these by-products through a multifaceted
antioxidant defence system. Every disturbance of this balance constitutes a clear and
present danger to the macromolecular integrity of the body. When defence mechanisms
become diminished or impaired, the resulting imbalance results in accumulation of …
Abstract
Aging is a dynamic process in which its rate and subsequent longevity of an organism are dependent upon the balance between the reactive intermediates of normal cellular metabolism and the ability of the body to reduce these by-products through a multifaceted antioxidant defence system. Every disturbance of this balance constitutes a clear and present danger to the macromolecular integrity of the body. When defence mechanisms become diminished or impaired, the resulting imbalance results in accumulation of endogenous agents, such as reactive oxygen and carbonyl species, and a state of increased cellular stress, which can accelerate the rate of aging. Glycation is the non-enzymatic glycosylation of proteins, nucleotides and lipids by saccharide derivatives. Glucose and other reducing sugars are important glycating agents, but the most reactive physiological relevant glycating agents, are the dicarbonyls, in particular methylglyoxal. Endogenously formed dicarbonyl compounds can react with proteins to form advanced glycation endproducts (AGEs). Experimental models have recently provided evidence that reduced detoxification of AGE precursors by the glyoxalase system, engagement of the cellular receptor RAGE and RAGE-dependent sustained activation of the pro-inflammatory transcription factor nuclear factor ĸB might significantly contribute to the rate of aging and the onset of age-related neurodegenerative, musculoskeletal and vascular diseases.
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