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Interpret with caution Most scientists working on aging urge caution in extrapolating promising results in animal studies to humans. For instance, cheap jordan shoes , one of the most promising early candidates for a rejuvenation factor from young blood was a protein called GDF11. Reports in 2013 and 2014 concluded that GDF11 levels in blood decline with age; restoring the protein in old animals could reverse some heart problems, cheap jordans online , improve muscle strength and spur nerve cell growth in the brain. ?Since those reports, other researchers have disputed the protein’s revitalizing powers. In a recent study, cheap jordans , researchers measured GDF11 levels in 140 people aged 21 to 93. Levels of the protein didn’t decline with age, cheap Authentic jordans , Mayo Clinic researchers reported in the June 14 Cell Metabolism. Previous researchers may have gotten GDF11 mixed up with a similar protein called myostatin, cheap jordans for sale , which does dip as people get older. Not only does GDF11 not decline with age, cheap real jordans , having too much of it could be bad, the Mayo team found. People with higher blood levels of the protein were more likely to be frail, cheap jordans free shipping , have diabetes and heart problems, and have a more difficult time recovering from surgery than people with lower levels of the protein. Beyond the blood experiments, scientists have examined various ideas about what goes wrong in aging and have devised strategies to counteract it. For instance, some evidence suggests that stem cells run out of steam as they get older. Restoring old stem cells to youthful vigor may enable them to repair or replace damaged tissues and turn back the biological clock. Keeping stem cells youthful may involve sheltering them from inflammation or things that could damage their DNA, cheap air jordans . http://psychologie-ge....wtopic.php?f=2&t=9464 http://users.atw.hu/fi...rum_topic&topic=11888 http://forum.drimmi.ru...4&p=604406#post604406 |