Research On August 11, 2008, it was announced that scientist had stopped the aging process in an entire organ. Associate Professor Ana Maria Cuervo, along with other researchers, stopped the aging process in mice livers by preventing harmful proteins inside organ's cells from building up (10). "As people age, their cells become less efficient at getting rid of damaged protein" (10). As a result, a toxic materials build up. These build-ups have been identified in individuals that have Alzheimer's, Parkinson's and other neurodegenerative disorders. Knowing this, scientist believe that increasing protein clearance will decrease the amount of function decline that accompanies old age (10). Experiments in which the livers of genetically modified mice between 22 to 26 months, the equivalent of humans between the ages of 80 and 90 years old, have been conducted. These mice were able to clean their blood as efficiently as other animals that were 1/4 of their age. The livers of normal mice, on the other hand, began to fail (10). ![]() Cuervo states that the information gathered during the experiments were relevant for neurodegenerative disorders like Parkinson's and Alzheimer's and that the cause for these diseases is due to damaged or "misbehaving" proteins that build up in neurons. By increasing protein clearance, scientist may be able to keep individuals inflicted with neurodegenerative diseases from experiencing symptoms longer (10). "If
the body's ability to dispose of cell debris within the cell were
enhanced across a wider range of tissues, it could extend life as well"
(10). Healthy organisms have a surveillance system within their cells
which is known as Chaperone-Medicated Autophagy (CMA). The CMA locates,
digests and destroys cells that are damaged. The "chaperones", or
specialized molecules, transport lysosomes, which are membrane-bound
sacs of enzymes. Once they've been delivered, "a receptor molecule
transfers the protein into the sac, where it is rapidly digested" (10).
As we grow older, these receptors become less efficient and don't work as well. As a result, faulty proteins build up and, in the liver, have been linked to insulin resistance, and the inability to metabolize sugar, fats, or alcohol in the liver. "The same breakdown of the cell's cleaning machinery can also impair the liver's ability to remove the toxic build-up of drugs at a stage in life when medication is often part of daily diet" (10). The mice within the experiment were genetically modified to compensate for the loss of these receptors. Doing so maintained a clean liver within the mice and it proved that cells that are kept clean work better (11). Although the information that was gained from the experiment was a huge step in age prevention, we are still a long way from discovering the secret that stops aging.
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Why Should You Care? In today's recession, sacrifices have made in order to compensate for the United States' lack of money. As students at Sheldon High School give up the privilege of having a library due to budget cuts, companies like Olay® continue to waste millions creating creams. If we uncovered the secret to age prevention, we would be able to use the extra money that would normally be used to produce useless creams for better purposes, such as purchasing new textbooks for classes or granting students a library. |
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