الأحد، 5 فبراير 2012

ScienceDaily: Health & Medicine News

ScienceDaily: Health & Medicine News

Identical twins reveal mechanisms behind aging

Posted: 02 Feb 2012 12:11 PM PST

Researchers compared the DNA of identical twins at different ages. They showed that structural modifications of the DNA, where large or small DNA segments change direction, are duplicated or completely lost, are more common in older people. The results may in part explain why the immune system is impaired with age.

Early bone growth linked to bone density in later life

Posted: 02 Feb 2012 12:10 PM PST

Researchers have shown that growth in early childhood can affect bone density in adult life, which could lead to an increased risk of developing bone diseases like Osteoporosis. The study is part of ongoing work in assessing the causes of common diseases at different stages of life from before conception through to old age, and the ways in which environmental influences affect gene expression to produce disease.

Alzheimer's disease may spread by 'jumping' from one brain region to another

Posted: 01 Feb 2012 02:32 PM PST

For decades, researchers have debated whether Alzheimer's disease starts independently in vulnerable brain regions at different times, or if it begins in one region and then spreads to neuroanatomically connected areas. A new study strongly supports the latter, demonstrating that abnormal tau protein, a key feature of the neurofibrillary tangles seen in the brains of those with Alzheimer's, propagates along linked brain circuits, "jumping" from neuron to neuron.
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