Localization and behaviors in null mice suggest that ASIC1 and ASIC2 modulate responses to aversive stimuli.

Localization and behaviors in null mice suggest that ASIC1 and ASIC2 modulate responses to aversive stimuli.
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DOI:
10.1111/gbb.12108
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发表时间:
2014-02
期刊:
Genes, brain, and behavior
影响因子:
--
通讯作者:
Welsh MJ
Welsh MJ
中科院分区:
其他
文献类型:
--
作者:
Price MP;Gong H;Parsons MG;Kundert JR;Reznikov LR;Bernardinelli L;Chaloner K;Buchanan GF;Wemmie JA;Richerson GB;Cassell MD;Welsh MJ

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酸传感离子通道 (ASIC) 产生 H+ 门控 Na+ 电流,有助于神经元功能和动物行为。与 ASIC1 一样,ASIC2 亚基在大脑中表达,并与 ASIC1 多聚化,以影响酸诱发电流并促进 ASIC1 定位于树突棘。为了更好地了解 ASIC2 如何促进大脑功能,我们定位了该蛋白质并测试了 ASIC2 基因破坏的行为后果。为了进行比较,我们还定位了 ASIC1 并研究了 ASIC1−/− 小鼠。 ASIC2 在高突触密度区域显着表达,除少数例外,ASIC1 和 ASIC2 定位表现出大量重叠。 ASIC1 或 ASIC2 的缺失会降低情境和听觉线索恐惧条件反射实验中对捕食者气味的反应以及对二氧化碳吸入的反应中的冻结行为。此外,ASIC1 或 ASIC2 的缺失增加了强迫游泳试验中的活性。这些数据表明 ASIC2 与 ASIC1 一样,在确定对厌恶刺激的防御反应中发挥着关键作用。他们还提出了一个问题:ASIC1 和 ASIC2 的基因变异是否会影响人类的恐惧和恐慌。
Acid sensing ion channels (ASICs) generate H+-gated Na+ currents that contribute to neuronal function and animal behavior. Like ASIC1, ASIC2 subunits are expressed in the brain and multimerize with ASIC1 to influence acid-evoked currents and facilitate ASIC1 localization to dendritic spines. To better understand how ASIC2 contributes to brain function, we localized the protein and tested the behavioral consequences of ASIC2 gene disruption. For comparison, we also localized ASIC1 and studied ASIC1−/− mice. ASIC2 was prominently expressed in areas of high synaptic density, and with a few exceptions, ASIC1 and ASIC2 localization exhibited substantial overlap. Loss of ASIC1 or ASIC2 decreased freezing behavior in contextual and auditory cue fear conditioning assays, in response to predator odor, and in response to CO2 inhalation. In addition, loss of ASIC1 or ASIC2 increased activity in a forced swim assay. These data suggest that ASIC2, like ASIC1, plays a key role in determining the defensive response to aversive stimuli. They also raise the question of whether gene variations in both ASIC1 and ASIC2 might affect fear and panic in humans.
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