过量摄入铜元素易引发老年痴呆
[font=Verdana, Arial, Tahoma][size=12px][b]A lifetime of too much copper in our diets may be contributing to Alzheimer's disease, US scientists say. [/b][/size][/font][font=Verdana, Arial, Tahoma][size=12px][b]一生的饮食中摄入过多铜元素可能引发阿尔茨海默症。[/b][/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]However, research is divided, with other studies suggesting copper may actually protect the [url=http://www.enread.com/plus/view.php?aid=93790]brain[/url]. [/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]The latest study in Proceedings of the National Academy of Sciences showed high levels of copper left the brain struggling to get rid of a protein thought to cause the dementia.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]Copper is a vital part of our diet and necessary for a healthy body.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]Tap water coming through copper pipes, red meat and shellfish as well as fruit and vegetables are all sources of dietary copper.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px][b]Barrier[/b][/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]The study on mice, by a team at the University of Rochester in New York, suggested that copper interfered with the brain's shielding - the [url=http://www.enread.com/plus/view.php?aid=93790]blood[/url] brain barrier. [/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]Mice that were fed more copper in their water had a greater build-up of the metal in the blood vessels in the brain. [/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]The team said this interfered with the way the barrier functioned and made it harder for the brain to get rid of a protein call beta amyloid.[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]One of the hallmarks of Alzheimer's disease is the formation of [b]plaques（斑块，瓷片） [/b]of [b]amyloid（淀粉体）[/b] in the dying brain. [/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]Lead researcher Dr Rashid Deane said: "It is clear that, over time, copper's cumulative effect is to impair the systems by which amyloid beta is removed from the brain."[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]He told the BBC that copper also led to more protein being produced: "It's a double [b]whammy（晦气，剧烈的打击）[/b] of increased production and decreased clearance of amyloid protein. [/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]"Copper is a very essential metal ion and you don't want a deficiency and many nutritious foods also contain [url=http://www.enread.com/plus/view.php?aid=93790]copper[/url]."[/size][/font]
[font=Verdana, Arial, Tahoma][size=12px]However, he said taking supplements may be "going overboard a bit".
[/size][/font]
[font=tahoma, helvetica, arial][size=14px]更多[/size][/font][b][size=24px][url=http://www.enread.com/news/index.html]英语新闻[/url][/size][/b]
页:
[1]