Advanced glycation end-products (AGEs) are compounds that form when proteins or lipids react with sugars through a process known as glycation. This process is a normal part of metabolism, but it becomes accelerated in conditions such as high blood glucose, oxidative stress, and as a natural part of aging. AGEs are not only markers of aging but also active contributors to cellular and tissue damage, playing a significant role in the pathogenesis of various age-related diseases. Understanding their formation and effects, and how to mitigate them, is crucial for promoting healthy aging and longevity.
The formation of AGEs is a non-enzymatic process that involves a series of reactions. It begins with the reaction of reducing sugars, such as glucose or fructose, with amino groups on proteins, lipids, or nucleic acids. This initial reaction forms a Schiff base, which is unstable, and then undergoes further rearrangement to form a stable Amadori product. Over time, these Amadori products undergo additional, complex reactions to produce advanced glycation end-products. These AGEs are diverse in structure and can be found in various tissues, including the skin, blood vessels, kidneys, and brain. The chronic presence of AGEs is problematic because they can alter the structure and function of proteins and lipids, impairing cellular processes, and promoting oxidative stress and inflammation.
One of the major ways in which AGEs contribute to aging is through their interactions with cell surface receptors called Receptor for Advanced Glycation End-products (RAGE). RAGE receptors are found on numerous cell types, and the binding of AGEs to RAGE triggers intracellular signaling pathways that activate inflammation and oxidative stress. This activation leads to increased production of inflammatory cytokines, such as IL-6 and TNF-α, which contribute to chronic low-grade inflamma....
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