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You'll find a rather interesting paper (abstract and full PDF are available) at the Annals of the New York Academy of Sciences on the topic of manipulating autophagy to repair some classes of age-related damage to cells and cellular components.
Aging denotes a post-maturational deterioration of cells and organisms with the passage of time, an increased vulnerability to challenges and prevalence of age-associated diseases, and a decreased ability to survive. Causes may be found in an enhanced production of reactive oxygen species (ROS) and oxidative damage and not completed housekeeping.
Caloric restriction is the most robust anti-aging intervention known so far. Similar beneficial effects on median and maximum life-span were obtained by feeding animals a 40% reduced diet or by every-other-day ad libitum feeding. In both instances, animals are forced to spend a great part of their time in a state of fasting and activated autophagy.
Autophagy is a highly conserved process in eukaryotes, in which the cytoplasm, including excess or aberrant organelles, is sequestered into double-membrane vesicles and delivered to the lysosome/vacuole, for breakdown and eventual recycling of the resulting macromolecules.
This process has an essential role in adaptation to fasting and changing environmental conditions, cellular remodeling during development, accumulation of altered ROS-hypergenerating organelles in older cells. Several pieces of evidence show that autophagy is involved in aging and is an essential part in the anti-aging mechanism of caloric restriction.
As an application, intensification of autophagy, by the administration of antilipolytic drug, rescued older cells from accumulation of altered [mitochondrial] DNA in less than 6 hours. It is concluded that the pharmacological intensification of autophagy [has] anti-aging effects and might prove to be a big step towards retardation of aging and prevention of age-associated diseases in humans.
Autophagy is a form of maintenance, the first step in the process of replacing damaged components with newly built components. It is promising that even today there are tools that could be applied to enhancing that process, or more likely serve as a starting point for the development of better, safer tools in the years to come.
You'll find more on autophagy as a process and its relationship to aging, mitochondria and calorie restriction back in the Fight Aging! archives:
Posted by Reason at October 16, 2007 8:17 PM
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