Cited by 100Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchNeural dynamics and brain function

Developmental Excitation of Corticothalamic Neurons by Nicotinic Acetylcholine Receptors

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Kassam, Sameera M., Herman, Patrick M., Goodfellow, Nathalie M., Alves, Nyresa C., Lambe, Evelyn K.·2008·The Journal of Neuroscience

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 α 4 β 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, α 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 ∼50% of the subsequent current elicited by acetylcholine. An allosteric modulator of α 4 β 2 α 5 receptors resulted in a 2.5-fold potentiation of submaximal nicotinic currents. This result is consistent with the expression of the relatively rare α 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.

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Crossref · 10.1523/jneurosci.2645-08.2008

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  • Currents mediated through α5/β2 nAChRs are maximal in the early postnatal period.

    “Electrophysiological studies have shown that currents mediated through α5/β2 Ã nAChRs are maximal in the early postnatal period (Kassam et al. 2008).”

    From Mechanisms of Nicotine Addiction (2021) · cites this paper as Kassam et al. 2008

    The section “Nicotinic currents in layer VI pyramidal neurons change across development” reports that currents in rat prefrontal cortical neurons were highest in the first postnatal month. The paper separately says pharmacological results suggest involvement of α5-containing α4β2 receptors; it does not establish that the measured developmental peak was specifically a peak in currents mediated by that receptor subtype. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Layer VI neurons are modulated by β2* nAChRs responsible for strong activation of the layer VI neuronal population.

    “These neurons are modulated by β2* nAChRs that are responsible for the strong activation of the layer VI neuronal population (Kassam et al. 2008; Poorthuis et al. 2012).”
  • Lynx may bind to non-agonist interfaces, such as the α4-α4 interface in (α4)3(β2)2 receptors, or the allosterically important α4-α5 interface if the complex includes an α5 subunit.

    “A modest and obvious extension of this idea is that lynx may bind to non-agonist interfaces, such as the α4–α4 interface in (α4)3(β2)2 receptors, or the allosterically important α4–α5 interface if the complex includes an α5 subunit (113,126).”
  • There is evidence of nicotine-exposure induced alterations in the electrophysiological characteristics of corticothalamic projection neurons.

    “This is supported by evidence of nicotine-exposure induced alterations in the electrophysiological characteristics of corticothalamic projection neurons [67].”
  • The later period (postnatal weeks 2 and 3) coincides with the peak nAChR-mediated currents exhibited by corticothalamic neurons projecting from medial prefrontal cortex.

    “This later period coincides with the peak nAChR-mediated currents exhibited by corticothalamic neurons projecting from medial prefrontal cortex [67].”

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Authors
Kassam, S. M., Herman, P. M., Goodfellow, N. M., Alves, N. C., & Lambe, E. K.
Affiliations
University of Toronto (CA)
Corresponding author
Lambe, Evelyn K.
Venue
The Journal of Neuroscience
Published
2008-08-27
Volume
28
Issue
35
Pages
8756-8764
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2022503151
Cited by
100
References
59
Citations by year
2025: 5 · 2024: 5 · 2023: 3 · 2022: 1 · 2021: 5 · 2020: 5 · 2019: 7 · 2018: 6 · 2017: 3 · 2016: 7 · 2015: 6 · 2014: 12 · 2013: 10 · 2012: 8
FWCI
2.33
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Alliance for Research on Schizophrenia and Depression
  • Canada Research Chairs
  • Canadian Institutes of Health Research (89825_1, 83422_1, 82660, 82660_1)
  • Natural Sciences and Engineering Research Council of Canada
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
Keywords
corticothalamic neurons, nicotinic acetylcholine receptors, alpha4beta2 nicotinic receptor, postnatal development, allosteric modulation, mediodorsal thalamus, attention
MeSH terms
Acetylcholine, Age Factors, Analysis of Variance, Animals, Animals, Newborn, Dose-Response Relationship, Drug, Electric Stimulation, Male, Membrane Potentials, Neural Pathways, Neurons, Receptors, Nicotinic, Rhodamines, Tetrodotoxin, Thalamus, Prefrontal Cortex, Patch-Clamp Techniques, Cholinergic Agents, Excitatory Amino Acid Antagonists, Statistics, Nonparametric, Sodium Channel Blockers, Rats

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