Environmental influence on L1 retrotransposons in the adult hippocampus.

Environmental influence on L1 retrotransposons in the adult hippocampus.
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DOI:
10.1002/hipo.20564
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发表时间:
2009-10
期刊:
影响因子:
3.5
通讯作者:
Gage, Fred H.
Gage, Fred H.
中科院分区:
医学3区
文献类型:
--
作者:
Muotri, Alysson R.;Zhao, Chunmei;Marchetto, Maria C. N.;Gage, Fred H.

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众所周知,神经元回路可以由经验塑造。神经元可塑性可以通过突触竞争相互作用和在成人脑的神经源性区域中添加新的神经元单元来实现。最近的数据表明,神经元祖细胞可以容纳体细胞LINE-1(长分散核元件-1或L1)逆转录。基因组L1插入可以上调或下调基因表达的转录控制。在这里,我们表明,运动有一个积极的影响,在体内的L1-EGFP报告。我们发现,与久坐不动的动物相比,经历自愿运动的小鼠的神经元更有可能激活代表大脑中L1插入的EGFP报告标记。在海马,成年人大脑的神经源性区域,EGFP表达主要发现在细胞定位在齿状回的颗粒下层。这一观察结果表明,神经元祖细胞可能支持从头反转录后,暴露于一个新的环境。这些证据表明,经验依赖性L1反转录可能有助于神经元可塑性的生理后果。
It is well established that neuronal circuits can be shaped by experience. Neuronal plasticity can be achieved by synaptic competitive interactions and the addition of new neuronal units in neurogenic regions of the adult brain. Recent data have suggested that neuronal progenitor cells can accommodate somatic LINE-1 (Long Interspersed Nuclear Elements-1 or L1) retrotransposition. Genomic L1 insertions may up- or down-regulate transcriptional control of gene expression. Here, we show that exercise has a positive effect on a L1-EGFP reporter in vivo. We found that neurons from mice that experience voluntary exercise are more likely to activate an EGFP reporter marker, representing L1 insertions in the brain, when compared with sedentary animals. In the hippocampus, a neurogenic region of the adult brain, EGFP expression is mainly found in cells localized in the subgranular layer of the dentate gyrus. This observation implies that neuronal progenitor cells may support de novo retrotransposition upon exposure to a new environment. Such evidence suggests that experience-dependent L1 retrotransposition may contribute to the physiological consequences of neuronal plasticity.
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