Contribution of interneuron subtype-specific GABAergic signalling to emergent sensory processing in somatosensory whisker barrel cortex in mouse

Contribution of interneuron subtype-specific GABAergic signalling to emergent sensory processing in somatosensory whisker barrel cortex in mouse
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中间神经元亚型特异性 GABA 信号对小鼠体感须桶皮层紧急感觉处理的贡献

DOI:
10.1101/2021.02.18.431791
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发表时间:
2021
期刊:
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影响因子:
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通讯作者:
Baruchin L
Baruchin L
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--
作者:
Baruchin L

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哺乳动物的新皮层对于感觉信息的有意识处理是重要的。该功能的基础是平衡的谷氨酸能和GABA能信号传导。然而,尽管对早期GABA能中间神经元(IN)回路的了解越来越多,但对这种相互作用如何在发育中的前脑中产生却知之甚少。为了进一步研究这一点,我们评估了特定的神经网络的发展的感觉处理在小鼠须桶皮质的贡献。具体来说,我们探讨了在速度编码和感觉适应的作用。在野生型动物中,速度处理和适应早在可塑性的第4层关键期就存在,并在此期间表现出细化,导致主动搅拌发作。然后,我们有条件地沉默动作电位依赖性GABA释放生长抑素(SST)或血管活性肠肽(VIP)的INS。这些遗传操作影响自发和感觉诱发的活动,在年龄和层依赖性的方式。沉默SST+ INs减少了早期自发活动,并取消了在对照组幼仔中观察到的感觉适应的促进作用。相比之下,VIP+ IN沉默对主动搅拌的开始有影响。沉默任一IN亚型对速度编码没有影响。我们的研究结果揭示了这些IN亚型如何在出生后的头几周内对早期感觉处理做出不同的贡献。
Mammalian neocortex is important for conscious processing of sensory information. Fundamental to this function is balanced glutamatergic and GABAergic signalling. Yet little is known about how this interaction arises in the developing forebrain despite increasing insight into early GABAergic interneuron (IN) circuits. To further study this, we assessed the contribution of specific INs to the development of sensory processing in the mouse whisker barrel cortex. Specifically we explored the role of INs in speed coding and sensory adaptation. In wild-type animals, both speed processing and adaptation were present as early as the layer 4 critical period of plasticity, and showed refinement over the period leading to active whisking onset. We then conditionally silenced action-potential-dependent GABA release in either somatostatin (SST) or vasoactive intestinal peptide (VIP) INs. These genetic manipulations influenced both spontaneous and sensory-evoked activity in an age and layer-dependent manner. Silencing SST+ INs reduced early spontaneous activity and abolished facilitation in sensory adaptation observed in control pups. In contrast, VIP+ IN silencing had an effect towards the onset of active whisking. Silencing either IN subtype had no effect on speed coding. Our results reveal how these IN subtypes differentially contribute to early sensory processing over the first few postnatal weeks.
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