維他命D激活免疫系統功能是必不可少的

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Vitamin D is essential for activating immune system function
Thursday, July 29, 2010
by: David Gutierrez, staff writer

(NaturalNews) Researchers have discovered that vitamin D plays a crucial role in activating the immune system's ability to recognize and fight pathogens.
（NaturalNews）研究人員已發現維他命D在激活免疫系統的能力，去識別和打擊病原體方面扮演關鍵角色。

While scientists have long known that vitamin D plays a critical role in bone health, recent research has begun to suggest that it also serves to regulate the immune system, helping prevent infection, cancer and autoimmune disorders. Until now, the mechanism by which the vitamin acts on the immune system has been unknown.
雖然科學家早就知道維他命D在骨骼健康方面起著關鍵作用，最近的研究已開始提出，它亦有助於調節免疫系統，幫助預防感染、癌症和自身免疫性疾病。到目前為止，那維他命在免疫系統的機制作用仍然不明。

In a study published in the journal Nature Immunology, researchers from the University of Copenhagen found that when a variety of white blood cells known as a T-cell comes across a pathogen in the bloodstream, it extends a receptor in search of vitamin D. If it encounters the vitamin, the T cell becomes "activated." If there is not enough vitamin D in the blood, the cell remains passive and no immune response occurs.

The body produces vitamin D upon exposure to sunlight. It can also be found in eggs, fatty fish, fortified milk and in supplement form.

Once activated, a T-cell transforms into one of two kinds of cells. One type seeks out and destroys all traces of the infectious agent, while the other records information about the pathogen and transmits it to other parts of the immune system. These latter ("helper") cells help the immune system respond quickly should infection with a similar pathogen occur at a later date.

In addition to providing new information about the importance of vitamin D, the study provides hope for better understanding -- and perhaps prevention -- of the unhelpful immune responses that result in autoimmune disorders like allergies or Type 1 diabetes, as well as those that cause the body to reject transplanted organs. The researchers were able to determine what chemical steps occur to transform a T-cell from active to inactive, suggesting the possibility that doctors may eventually be able to initiate or block this process, depending on the patient's need.

Sources for this story include:
http://news.ku.dk/all_news/2010/2010.3/d_vitamin/;

http://www.naturalnews.com/029312_immune_system_vitamin_D.html

琴酒殿

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