Crossed Connections From Insular Cortex to the Contralateral Thalamus.

Crossed Connections From Insular Cortex to the Contralateral Thalamus.
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DOI:
10.3389/fncir.2021.710925
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发表时间:
2021
影响因子:
3.5
通讯作者:
Lee CC
Lee CC
中科院分区:
医学3区
文献类型:
--
作者:
Adeyelu T;Gandhi T;Lee CC

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除嗅觉外,所有形式的感觉信息在随后传递到大脑皮层之前都在丘脑水平进行处理。这种传入的感觉流在丘脑中通过起源于第6层的许多下行皮质丘脑投射进行细化和调制,最终改变感觉特征的敏感性和选择性。一般来说,这些感觉丘脑-皮质-丘脑回路被认为是严格单侧的,即,皮层和丘脑之间没有对侧串扰然而,在这种典型的观点相反,我们在这里描述了一个突出的对侧皮质丘脑投射起源于岛叶皮质,利用逆行追踪和Cre-lox介导的病毒顺行追踪策略与Ntsr 1-Cre转基因小鼠系。从我们的研究中,我们发现,岛对侧皮质丘脑投射起源于一个单独的人口比同侧皮质丘脑投射的第6层神经元。此外,对侧投影的目标是一个地形不同的子区域的丘脑比同侧投影。这些发现表明,一个独特的双边机制,自上而下的完善上升的感觉信息。
Sensory information in all modalities, except olfaction, is processed at the level of the thalamus before subsequent transmission to the cerebral cortex. This incoming sensory stream is refined and modulated in the thalamus by numerous descending corticothalamic projections originating in layer 6 that ultimately alter the sensitivity and selectivity for sensory features. In general, these sensory thalamo-cortico-thalamic loops are considered strictly unilateral, i.e., no contralateral crosstalk between cortex and thalamus. However, in contrast to this canonical view, we characterize here a prominent contralateral corticothalamic projection originating in the insular cortex, utilizing both retrograde tracing and cre-lox mediated viral anterograde tracing strategies with the Ntsr1-Cre transgenic mouse line. From our studies, we find that the insular contralateral corticothalamic projection originates from a separate population of layer 6 neurons than the ipsilateral corticothalamic projection. Furthermore, the contralateral projection targets a topographically distinct subregion of the thalamus than the ipsilateral projection. These findings suggest a unique bilateral mechanism for the top-down refinement of ascending sensory information.
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