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Originally posted by Frogs
If I'm reading this right, aging is apparently one of the body's ways of stopping cancer by destroying or shutting down damaged cells.
Originally posted by SaturnFX
reply to post by DevolutionEvolvd
I am reading doubletalk in this article. most people have no concept of the telomere issue and so wont question their hypothesis...I smell a rat.
Originally posted by DevolutionEvolvd
reply to post by SaturnFX
Oh yeah, double-talk indeed. It's really old news and it's quite evident that researchers have a long way to go.
One of the biggest puzzles in biology – how and why living cells age – has been solved by an international team based at Newcastle University, in north-east England.
Each kind of tissue has its own turnover time, related at least partially to the workload endured by its cells. Epidermic cells, forming the easily damaged skin of the body, are recycled every two weeks or so. Red blood cells, in constant motion on their journey through the circulatory system, last only 4 months. As for the liver, the human body's detoxifier, its cells' lives are quite short - an adult human liver cell has a turnover time of 300 to 500 days.
Cells lining the surface of the gut, known by other methods to last for only five days, are among the shortest-lived in the whole body. Ignoring them, the average age of intestinal cells is 15.9 years, Dr Frisén found. Skeletal cells are a bit older than a decade and cells from the muscles of the ribs have an average age of 15.1 years. When looking into the brain cells, all of the samples taken from the visual cortex, the region responsible for processing sight, were as old as the subjects themselves, supporting the idea that these cells do not regenerate. 'The reason these cells live so long is probably that they need to be wired in a very stable way,' Frisén speculates. Other brain cells are more short-lived. Dr Frisén found that the heart, as a whole, does generate new cells, but he has not yet measured the turnover rate of the heart's muscle cells. And the average age of all the cells in an adult's body may turn out to be as young as 7 to 10 years, according to him.
Why then, if the body remains so eminently capable of renewing its tissues, doesn't the regeneration continue forever? Some scientists believe this is explained by the accumulation of mutations in the DNA, which gradually degrades its information. Another theory blames mitochondrial DNA, which lack the repair mechanisms available for the chromosomes, whilst a third theory postulates that stem cells, which are the source of new cells in each tissue, eventually grow feeble with age.