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WHAT ARE FREE RADICALS??? WHAT FIGHTS FREE RADICAL DAMAGE?
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Background
The free radical theory of aging was conceived by Denham Harman in the 1950s, when prevailing scientific opinion held that free radicals were too unstable to exist in biological systems.[10] This was also before anyone invoked free radicals as a cause of degenerative diseases.[11] Two sources inspired Harman: 1) the rate of living theory, which holds that lifespan is an inverse function of metabolic rate which in turn is proportional to oxygen consumption, and 2) Rebbeca Gershman's observation that hyperbaric oxygen toxicity and radiation toxicity could be explained by the same underlying phenomenon: oxygen free radicals.[10][12] Noting that radiation causes "mutation, cancer and aging", Harman argued that oxygen free radicals produced during normal respiration would cause cumulative damage which would eventually lead to organismal loss of functionality, and ultimately death.[10][13]
In later years, the free radical theory was expanded to include not only aging per se, but also age-related diseases.[11] Free radical damage within cells has been linked to a range of disorders including cancer, arthritis, atherosclerosis, Alzheimer's disease, and diabetes.[14] There has been some evidence to suggest that free radicals and some reactive nitrogen species trigger and increase cell death mechanisms within the body such as apoptosis and in extreme cases necrosis.[15]
In 1972, Harman modified his original theory to what became known as the mitochondrial theory of aging.[11] In its current form, this theory proposes that reactive oxygen species that are produced in the mitochondria, causes damage to certain macromolecules including lipids, proteins and most importantly mitochondrial DNA.[16] This damage then causes mutations which leads to an increase of ROS production and greatly enhances the accumulation of free radicals within cells.[17] This mitochondrial theory has been more widely accepted that it could play a major role in contributing to the aging process.[18]
Since Harman first proposed the free radical theory of aging, there have been continual modifications and extensions to his original theory
http://en.wikipedia.org/wiki/Free-radical_theory_of_aging