Categorization of biologically relevant chemical signals in the medial amygdala.

Categorization of biologically relevant chemical signals in the medial amygdala.
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DOI:
10.1016/j.brainres.2009.01.048
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发表时间:
2009-03-31
期刊:
影响因子:
2.9
通讯作者:
Meredith M
Meredith M
中科院分区:
医学3区
文献类型:
--
作者:
Samuelsen CL;Meredith M

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许多物种使用化学信号在同一物种的成员之间传递信息(同种),但化学信号也可以向另一个物种提供信息(异种)。在这里,我们发现同种化学信号(雄性,雌性小鼠的尿液)增加了雄性小鼠杏仁内侧前核和后内侧杏仁核的即刻早期基因蛋白(IEG)的表达,而大多数异种化学信号(例如:仓鼠阴道液,牛尿)只在杏仁内侧前核增加了表达。这种对杏仁内侧核反应的分类与我们之前报道的雄性仓鼠的发现一致。相同的IEG表达特征模式出现在每个物种的杏仁内侧核中,以响应该物种的同种刺激。这些结果表明,杏仁核根据被测试物种的生物相关性对刺激进行分类。因此,引起小鼠行为回避的异种捕食者(猫圈)刺激,增加了小鼠杏仁内侧后核IEG的表达(类似于同种刺激)。进一步的分析表明,与生殖相关的潜在威胁刺激会在杏仁内侧后核不同的亚区(分别是背侧和腹侧)产生更高的IEG表达。杏仁内侧核IEG的这些表达模式可能提供了化学感觉信号的三级分类的一瞥,超越了化学感觉神经元的一级选择性和主、副嗅球的二级分类。
Many species employ chemical signals to convey messages between members of the same species (conspecific), but chemosignals may also provide information to another species (heterospecific). Here, we found that conspecific chemosignals (male, female mouse urine) increased immediate early gene-protein (IEG) expression in both anterior and posterior medial amygdala of male mice, whereas most heterospecific chemosignals (e.g.: hamster vaginal fluid, steer urine) increased expression only in anterior medial amygdala. This categorization of responses in medial amygdala conforms to our previously reported findings in male hamsters. The same characteristic pattern of IEG expression appears in the medial amygdala of each species in response to conspecific stimuli for that species. These results suggest that the amygdala categorizes stimuli according to the biological relevance for the tested species. Thus, a heterospecific predator (cat collar) stimulus, which elicited behavioral avoidance in mice, increased IEG expression in mouse posterior medial amygdala (like conspecific stimuli). Further analysis suggests reproduction related and potentially threatening stimuli produce increased IEG expression in different sub-regions of posterior medial amygdala (dorsal and ventral, respectively). These patterns of IEG expression in medial amygdala may provide glimpses of a tertiary sorting of chemosensory signals beyond the primary-level selectivity of chemosensory neurons and the secondary sorting in main and accessory olfactory bulbs.
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