Cited by 303Neurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Conditional anterograde tracing reveals distinct targeting of individual serotonin cell groups (B5-B9) to the forebrain and brainstem

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Muzerelle, Aude, Scotto-Lomassese, Sophie, Bernard, Jean François, Soiza-Reilly, Mariano, Gaspar, Patricia·2016·Brain Structure and Function

Abstract

Serotoninergic innervation of the central nervous system is provided by hindbrain raphe nuclei (B1-B9). The extent to which each raphe subdivision has distinct topographic organization of their projections is still unclear. We provide a comprehensive description of the main targets of the rostral serotonin (5-HT) raphe subgroups (B5-B9) in the mouse brain. Adeno-associated viruses that conditionally express GFP under the control of the 5-HT transporter promoter were used to label small groups of 5-HT neurons in the dorsal (B7d), ventral (B7v), lateral (B7l), and caudal (B6) subcomponents of the dorsal raphe (DR) nucleus as well as in the rostral and caudal parts of the median raphe (MR) nucleus (B8 and B5, respectively), and in the supralemniscal (B9) cell group. We illustrate the distinctive and largely non-overlapping projection areas of these cell groups: for instance, DR (B7) projects to basal parts of the forebrain, such as the amygdala, whereas MR (B8) is the main 5-HT source to the hippocampus, septum, and mesopontine tegmental nuclei. Distinct subsets of B7 have preferential brain targets: B7v is the main source of 5-HT for the cortex and amygdala while B7d innervates the hypothalamus. We reveal for the first time the target areas of the B9 cell group, demonstrating projections to the caudate, prefrontal cortex, substantia nigra, locus coeruleus and to the raphe cell groups. The broad topographic organization of the different raphe subnuclei is likely to underlie the different functional roles in which 5-HT has been implicated in the brain. The present mapping study could serve as the basis for genetically driven specific targeting of the different subcomponents of the mouse raphe system.

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  • Serotonergic projections from the dorsal and medial Raphe nuclei are among the first to emerge and arrive in the PFC around E16/E17 in rodents and postnatal weeks 10-13 in humans.

    “The brain matures from the brainstem to the more frontal cortical regions, and it is therefore not surprising that serotonergic projections from both the dorsal as well as the medial Raphe nuclei (DRN, MRN respectively) are among the first to emerge and are set towards cortical regions where they arrive in the PFC around E16/E17 in rodent and week postnatal 10–13 in humans [113–116].”

    From Development of prefrontal cortex (2022) · cites this paper as [115]

    The Results sections on the ventral dorsal raphe (B7v) and median raphe (B8) report serotonergic innervation of the medial prefrontal cortex, supporting the projection-to-PFC part of the claim. The paper does not establish that these projections are among the first to emerge or that they arrive at E16/E17 in rodents or postnatal weeks 10–13 in humans; its mapping study concerns mice, not human developmental timing. The indexed copy provides section labels but no page numbers for these passages. (LLM, conf=0.87)

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  • Axons seen in hippocampus likely originated from Vglut3+ cells in MR.

    “[Note that axons seen in hippocampus likely originated from Vglut3+ cells in MR (Muzerelle et al., 2016), though the majority of labeled somata were located in the ventral portion of pDR; see Figure 7—figure supplement 3C].”
  • The MR serotonin neurons project to structures near the midline, whereas the DR serotonin neurons target more lateral regions.

    “The MR serotonin neurons project to structures near the midline, whereas the DR serotonin neurons target more lateral regions (Jacobs and Azmitia, 1992; Muzerelle et al., 2016; Vertes, 1991; Vertes et al., 1999).”
  • DRN 5-HT neurons send highly divergent projections that target many functionally distinct brain regions.

    “DRN 5-HT neurons send highly divergent projections that target many functionally distinct brain regions (Azmitia and Segal, 1978; Muzerelle et al., 2016; Vertes, 1991).”

    From Molecular and anatomical organization of the dorsal raphe nucleus (2019) · cites this paper as Muzerelle et al., 2016

  • The dorsolateral subregion innervates many subcortical sensory and hypothalamic nuclei, in addition to motor nuclei in the brainstem.

    “The dorsolateral subregion innervates many subcortical sensory and hypothalamic nuclei, in addition to motor nuclei in the brainstem (Lee et al., 2008; Muzerelle et al., 2016).”

    From Molecular and anatomical organization of the dorsal raphe nucleus (2019) · cites this paper as Muzerelle et al., 2016

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Authors
Muzerelle, A., Scotto-Lomassese, S., Bernard, J. F., Soiza-Reilly, M., & Gaspar, P.
Affiliations
Inserm (FR)
Venue
Brain Structure and Function
Published
2014-11-18
Volume
221
Issue
1
Pages
535-561
ISSN
  • 1863-2653 (ISSN-L)
  • 1863-2661
OpenAlex
W2064063251
Cited by
303
References
82
Citations by year
2026: 15 · 2025: 22 · 2024: 34 · 2023: 25 · 2022: 24 · 2021: 34 · 2020: 48 · 2019: 27 · 2018: 24 · 2017: 27 · 2016: 15 · 2015: 8
FWCI
7.61
Type
journal article
Language
en
Open access
Locations
  • Brain Structure and Function (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, cc-by)
Funders
  • Agence Nationale de la Recherche
  • Institut National de la Santé et de la Recherche Médicale
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
serotonin, raphe nuclei, dorsal raphe nucleus, median raphe, topographic organization, forebrain, brainstem, amygdala, hippocampus, hypothalamus, prefrontal cortex, substantia nigra, locus coeruleus, caudate nucleus, mice
MeSH terms
Animals, Brain Stem, Mice, Inbred C57BL, Mice, Transgenic, Neural Pathways, Serotonin, Prosencephalon, Integrases, 5' Untranslated Regions, Serotonin Plasma Membrane Transport Proteins, Neuroanatomical Tract-Tracing Techniques, Serotonergic Neurons, Midbrain Raphe Nuclei

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