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• W2022503151 abstract "In this study, we show robust nicotinic excitation of pyramidal neurons in layer VI of prefrontal cortex. This layer contains the corticothalamic neurons, which gate thalamic activity and play a critical role in attention. Our experiments tested nicotinic excitation across postnatal development, using whole-cell recordings in prefrontal brain slices from rats. These experiments showed that layer VI neurons have peak nicotinic currents during the first postnatal month, a time period of intensive cortical development in rodents. We demonstrate that these currents are mediated directly by postsynaptic nicotinic receptors and can be suppressed by a competitive antagonist of alpha(4)beta(2)* nicotinic receptors. To record from identified corticothalamic neurons, we performed stereotaxic surgery to label the neurons projecting to medial dorsal thalamus. As hypothesized, recordings from these retrogradely labeled neurons in layer VI showed prominent nicotinic currents. Finally, we examined the effects of the drug nicotine on layer VI neurons and probed for the potential involvement of the accessory subunit, alpha(5), in their receptors. A level of nicotine similar to that found in the blood of smokers elicits a stable inward current in layer VI neurons, yet this exposure desensitizes approximately 50% of the subsequent current elicited by acetylcholine. An allosteric modulator of alpha(4)beta(2)alpha(5) receptors resulted in a 2.5-fold potentiation of submaximal nicotinic currents. This result is consistent with the expression of the relatively rare alpha(5) nicotinic subunit in layer VI. In summary, we show that layer VI corticothalamic neurons can be strongly excited during development by an unusual subtype of nicotinic receptor." @default.
• W2022503151 created "2016-06-24" @default.
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• W2022503151 date "2008-08-27" @default.
• W2022503151 modified "2023-09-30" @default.
• W2022503151 title "Developmental Excitation of Corticothalamic Neurons by Nicotinic Acetylcholine Receptors" @default.
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• W2022503151 doi "https://doi.org/10.1523/jneurosci.2645-08.2008" @default.
• W2022503151 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2909269" @default.
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