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(单词翻译:双击或拖选)
A friend’s four year old daughter recently complained to me about how badly her mosquito bite itched2. She was about to burst into tears. The fact that an uncomfortable itchy sensation can drive many of us to distraction3 led many scientists to believe that the nervous system deals with itch1 much as it does pain. Others spent years looking, unsuccessfully, for neurons that tell us to scratch rather than that we just hurt.
Now, according to a study in the August 7th issue of the journal Science, researchers say they’ve finally found specific itch neurons in mice. They located them in the mouse spinal4 cord by following up on previous research that showed that some mice respond to itchy stimuli5 more than others.
When scientists knocked out the itch neurons, the mice no longer had the urge to scratch in response to known itchy stimulus6. But they could still sense and avoid pain, showing that itch and pain are processed independently.The researchers hope that these findings could eventually lead to better treatments for chronic7 itch, by targeting the specific biochemical pathways involved. As for the four-year-old? She forgot about her itchy bug8 bite as soon as lunch arrived.
1 itch | |
n.痒,渴望,疥癣;vi.发痒,渴望 | |
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2 itched | |
v.发痒( itch的过去式和过去分词 ) | |
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3 distraction | |
n.精神涣散,精神不集中,消遣,娱乐 | |
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4 spinal | |
adj.针的,尖刺的,尖刺状突起的;adj.脊骨的,脊髓的 | |
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5 stimuli | |
n.刺激(物) | |
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6 stimulus | |
n.刺激,刺激物,促进因素,引起兴奋的事物 | |
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7 chronic | |
adj.(疾病)长期未愈的,慢性的;极坏的 | |
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8 bug | |
n.虫子;故障;窃听器;vt.纠缠;装窃听器 | |
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