Cited by 156Neurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology ResearchSchizophrenia research and treatment

5-HT1A receptor agonists enhance pyramidal cell firing in prefrontal cortex through a preferential action on GABA interneurons

Llado-Pelfort, L., Santana, N., Ghisi, V., Artigas, F., Celada, P.·2012·Cerebral Cortex

Abstract

5-HT(1A) receptors (5-HT1AR) are expressed by pyramidal and γ-aminobutyric acidergic (GABAergic) neurons in medial prefrontal cortex (mPFC). Endogenous serotonin inhibits mPFC pyramidal neurons via 5-HT1AR while 5-HT1AR agonists, given systemically, paradoxically excite ventral tegmental area-projecting pyramidal neurons. This enhances mesocortical dopamine function, a process involved in the superior efficacy of atypical antipsychotic drugs on negative and cognitive symptoms of schizophrenia. Moreover, the 5-HT1AR-induced increase of pyramidal discharge may also contribute to the maintenance of activity patterns required for working memory, impaired in schizophrenia. Given the importance of these processes, we examined the neurobiological basis of pyramidal activation through 5-HT1AR using the prototypical agent 8-OH-DPAT. (±)8-OH-DPAT (7.5 μg/kg i.v.) increased discharge rate and c-fos expression in rat mPFC pyramidal neurons. Local blockade of GABA(A) inputs with gabazine (SR-95531) avoided (±)8-OH-DPAT-induced excitations of pyramidal neurons. Moreover, (±)8-OH-DPAT administration reduced the discharge rate of mPFC fast-spiking GABAergic interneurons at doses exciting pyramidal neurons. Activation of other 5-HT1AR subpopulations (raphe nuclei or hippocampus) does not appear to contribute to pyramidal excitations. Overall, the present data suggest a preferential action of (±)8-OH-DPAT on 5-HT1AR in GABAergic interneurons. This results in pyramidal disinhibition and subsequent downstream excitations of subcortical structures reciprocally connected with PFC, such as midbrain dopaminergic neurons.

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Crossref · 10.1093/cercor/bhr220

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  • CBD rapidly increases extracellular serotonin and glutamate levels in mouse cortex.

    “CBD rapidly increases extracellular serotonin and glutamate levels in mouse cortex (Llado-Pelfort et al., 2012)”

    From The endocannabinoid system as a target for novel anxiolytic drugs (2017) · cites this paper as Llado-Pelfort et al., 2012

  • CBD amplifies 5-HT1A-R-mediated inhibition of GABAergic interneurons to disinhibit glutamatergic output in downstream structures.

    “amplifies 5-HT1A-R-mediated inhibition of GABAergic interneurons (Santana et al., 2004) to disinhibit glutamatergic output in downstream structures (Llado-Pelfort et al., 2012).”

    From The endocannabinoid system as a target for novel anxiolytic drugs (2017) · cites this paper as Llado-Pelfort et al., 2012

  • CBD's amplification of 5-HT1A-R-mediated inhibition is likely to augment activity at 5-HT neurons in the dorsal raphe nucleus, enhancing 5-HT in corticolimbic projection fields.

    “This in turn is likely to augment activity at 5-HT neurons in the dorsal raphe nucleus (DRN) (Llado-Pelfort et al., 2012), enhancing 5-HT in corticolimbic projection fields to complete a system-level functional loop.”

    From The endocannabinoid system as a target for novel anxiolytic drugs (2017) · cites this paper as Llado-Pelfort et al., 2012

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Authors
Llado-Pelfort, L., Santana, N., Ghisi, V., Artigas, F., & Celada, P.
Affiliations
Consejo Superior de Investigaciones Científicas (ES)
Venue
Cerebral Cortex
Published
2011-09-05
Volume
22
Issue
7
Pages
1487-1497
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2129506769
Cited by
156
References
96
Citations by year
2026: 6 · 2025: 10 · 2024: 6 · 2023: 8 · 2022: 10 · 2021: 16 · 2020: 17 · 2019: 7 · 2018: 4 · 2017: 10 · 2016: 12 · 2015: 13 · 2014: 12 · 2013: 13 · 2012: 9
FWCI
4.90
Type
journal article
Language
en
Open access
closed
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
Keywords
5-HT1A receptor agonist, 8-OH-DPAT, medial prefrontal cortex, pyramidal neurons, GABAergic interneurons, fast-spiking interneurons, disinhibition, gabazine, Fos expression, schizophrenia, mesocortical dopamine, working memory
MeSH terms
Action Potentials, Animals, gamma-Aminobutyric Acid, Interneurons, Male, Neural Pathways, Rats, Wistar, 8-Hydroxy-2-(di-n-propylamino)tetralin, Prefrontal Cortex, Pyramidal Cells, Rats, Serotonin 5-HT1 Receptor Agonists

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