可以使蠕虫打盹儿的蛋白质
文章来源:未知 文章作者:enread 发布时间:2016-03-08 06:32 字体: [ ]  进入论坛
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Sometimes, a nematode worm just needs to take a nap. In fact, its life may depend on it. New research has identified a protein that promotes a sleep-like state in the nematode Caenorhabditis elegans. Without the snooze-inducing molecule1, worms are more likely to die when confronted with stressful conditions, report researchers in the March 7, 2016 issue of the journal GENETICS. The C. elegans sleep-like behavior is surprisingly similar to the sleep of humans and other mammals. In this state, the worm stops moving, relaxes, and uncurls its body. It also shows reduced neuronal activity and is less responsive to stimuli2, but will then"wake up" if an experimenter pokes3 it too much. Like sleep-deprived humans, a worm that has been woken up repeatedly will fall back to sleep faster and will stay asleep longer than a well-rested worm.
 
The similarities are not just superficial: many of the molecules4 that regulate this process in C. elegans, including the epidermal5 growth factor receptor (EGFR), also influence sleep in mammals. This suggests that the worm sleep-like state is evolutionarily related to our own slumber6. Because C. elegans is easy to experimentally manipulate and has a simple nervous system, it can serve as a tool for understanding how human sleep-wake cycles are regulated.
 
Worms don't sleep on a day/night schedule like mammals. Instead, their sleep-like behavior occurs at specific stages during development; the worms enter this state each time they transition from one larval stage to another. They also sleep for several hours after a stressful event, including extremely hot or cold conditions or exposure to toxins7. If they don't get this post-stress nap, worms are less likely to survive the noxious8 event.
 
In the new research, the authors investigated whether a protein known to regulate rhythmic9 activities in C. elegans--like feeding, defecating, and reproducing--also regulates sleep. This protein, VAV-1, is active in a specific worm neuron that has previously10 been implicated11 in promoting sleep-like states via EGFR.


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1 molecule Y6Tzn     
n.分子,克分子
参考例句:
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈?f婘??妈?成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
2 stimuli luBwM     
n.刺激(物)
参考例句:
  • It is necessary to curtail or alter normally coexisting stimuli.必需消除或改变正常时并存的刺激。
  • My sweat glands also respond to emotional stimuli.我的汗腺对情绪刺激也能产生反应。
3 pokes 6cad7252d0877616449883a0e703407d     
v.伸出( poke的第三人称单数 );戳出;拨弄;与(某人)性交
参考例句:
  • He pokes his nose into everything. 他这人好管闲事。 来自《现代汉英综合大词典》
  • Only the tip of an iceberg pokes up above water. 只有冰山的尖端突出于水面。 来自辞典例句
4 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
参考例句:
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
5 epidermal 5766075fb8cff831ca9f6dcb335ab9bc     
adj. [解][生]表皮的,外皮的
参考例句:
  • Epidermal growth factor is a single-chain peptide with 53 amino-acid residue. 表皮生长因子(epidermal growth factor EGF)是最初从小鼠的下颌下腺提取的一种含有53个氨基酸残基的单链多肽。
  • Telia are dark brown or black, and shine from the intact host epidermal covering. 冬孢子堆呈暗褐色或黑色,覆盖在完整的寄生表皮下显得发亮。
6 slumber 8E7zT     
n.睡眠,沉睡状态
参考例句:
  • All the people in the hotels were wrapped in deep slumber.住在各旅馆里的人都已进入梦乡。
  • Don't wake him from his slumber because he needs the rest.不要把他从睡眠中唤醒,因为他需要休息。
7 toxins 18c3f40d432ba8dc33bad8fb82873ea8     
n.毒素( toxin的名词复数 )
参考例句:
  • The seas have been used as a receptacle for a range of industrial toxins. 海洋成了各种有毒工业废料的大容器。
  • Most toxins are naturally excreted from the body. 大部分毒素被自然排出体外。 来自《简明英汉词典》
8 noxious zHOxB     
adj.有害的,有毒的;使道德败坏的,讨厌的
参考例句:
  • Heavy industry pollutes our rivers with noxious chemicals.重工业产生的有毒化学品会污染我们的河流。
  • Many household products give off noxious fumes.很多家用产品散发有害气体。
9 rhythmic rXexv     
adj.有节奏的,有韵律的
参考例句:
  • Her breathing became more rhythmic.她的呼吸变得更有规律了。
  • Good breathing is slow,rhythmic and deep.健康的呼吸方式缓慢深沉而有节奏。
10 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
11 implicated 8443a53107b44913ed0a3f12cadfa423     
adj.密切关联的;牵涉其中的
参考例句:
  • These groups are very strongly implicated in the violence. 这些组织与这起暴力事件有着极大的关联。 来自《简明英汉词典》
  • Having the stolen goods in his possession implicated him in the robbery. 因藏有赃物使他涉有偷盗的嫌疑。 来自《现代汉英综合大词典》
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