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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Nicotinic receptors regulate the survival of newborn neurons in the adult olfactory bulb.
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Nicotinic receptors regulate the survival of newborn neurons in the adult olfactory bulb.

机译:烟碱受体调节成年嗅球中新生神经元的存活。

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摘要

Cholinergic axons and nicotinic receptors are abundant in all layers of the olfactory bulb (OB), the main region of newborn neuron integration in the adult brain. Here, we report that the OB granule cell layer in mice lacking the predominant form of brain high-affinity nicotinic acetylcholine receptors (beta(2)(-/-) mice) displayed nearly 50% more newborn neurons and significantly fewer apoptotic cells than did beta(2)(+/+) mice. Conversely, in vivo chronic nicotine exposure significantly decreased the number of newborn granule cells in beta(2)(+/+) but not beta(2)(-/-) adult mice, confirming that the survival of newborn neurons can be controlled by the activation of beta(2)-containing nicotinic acetylcholine receptors. Unexpectedly, investigating the behavioral consequence of an increased number of granule cells in beta(2)(-/-) mice revealed that these animals have a less robust short-term olfactory memory than their wild-type counterparts. Taken together, these results provide evidence that high-affinity nicotinic receptors are involved in the maturation of adult OB local circuits. They also indicate that an increase in the number of granule cells does not necessarily correlate with better olfactory performance and further highlight the importance of cholinergic afferents for olfactory processing.
机译:胆碱能轴突和烟碱样受体在嗅球(OB)的所有层中都很丰富,嗅球是成年人大脑中新生神经元整合的主要区域。在这里,我们报告缺少主要形式的大脑高亲和力烟碱型乙酰胆碱受体(β(2)(-/-)小鼠)的小鼠中的OB颗粒细胞层显示的新生神经元数和凋亡细胞数均比正常情况下高近50% beta(2)(+ / +)小鼠。相反,体内慢性尼古丁暴露可显着减少beta(2)(+ / +)中新生颗粒细胞的数量,但不会减少beta(2)(-/-)成年小鼠中的新生颗粒细胞的数量,这证实了新生神经元的存活可以通过控制含β(2)的烟碱乙酰胆碱受体的激活。出乎意料的是,调查增加数量的行为在β(2)(-/-)小鼠中的颗粒细胞的行为结果表明,这些动物的短期嗅觉记忆力不及野生动物。综上所述,这些结果提供了证据,表明高亲和力的烟碱样受体参与了成年OB局部回路的成熟。他们还表明,颗粒细胞数量的增加并不一定与更好的嗅觉性能相关,并且进一步突出了胆碱能传入物质对嗅觉加工的重要性。

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