Nature news:[...]
To investigate the protective effects of acupuncture in the brain, a team led by Sabina Lim at Kyung Hee University in Seoul, South Korea, used a standard mouse model of Parkinson's disease, in which injections of a chemical known as MPTP kill off brain cells that manufacture dopamine.
Some of the injected mice then received acupuncture every two days in two spots, one behind the knee and one on top of the foot. In humans, says Lim, these points are traditionally considered to be involved in muscle movement, and thus could potentially be seen as targets for treatment of Parkinson's. Another group of mice received acupuncture in two spots on the hips, not believed to be effective for acupuncture. A third group had no acupuncture at all.
By the end of seven days, the MPTP injections had decreased dopamine levels both in the mice that had not had acupuncture, and in the mice that received 'pretend' acupuncture, to about half the normal amount. But in the acupuncture-treated group, dopamine levels declined much less steeply, and nearly 80% of the dopamine remained.
The mechanism for such an effect is still unknown, Lim says.
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http://www.bioedonline.org/news/news.cfm?art=3083&mid=12674