Cited by 111Neurotransmitter Receptor Influence on BehaviorNeurogenesis and neuroplasticity mechanismsNeuroscience and Neuropharmacology Research

Expression of serotonin transporter protein in developing rat brain

Zhou, Feng C, Sari, Youssef, Zhang, Jing K·2000·Developmental Brain Research

Abstract

Serotonin transporter (5-HTT), a transmembrane protein, has been shown in adult brain to be distributed not only on synaptic terminals but to a great extent on axons as well. Here we report the ontogeny of 5-HTT and its relationship with serotonin (5-HT) neurons using established 5-HTT and 5-HT antibodies. Both 5-HTT- and 5-HT-immunostaining (-im) appear in 5-HT neurons at embryonic day 12 (E12) in rostral raphe nuclei (RRN). Soon after appearing, 5-HTT-im is highly expressed on axons, similar to adult expression. However, in contrast to adult, 5-HTT-im also outlines the soma-dendrites. Rich 5-HTT-im appears along the entire length of projecting axons, extending to the growth tip. In the next 2 days, intensive 5-HTT-im axons from RRN travel a course preferentially in the floor plate and later, the medial forebrain bundle trajectory. A group of new 5-HT-im neurons and 5-HTT-im axons appear at E13 in caudal raphe nuclei. At E16-18, taking the exact trajectory course of 5-HT axons, 5-HTT-im axons reach ganglionic eminence, olfactory bulb, and cortex and disperse into many brain regions in E18-20. No 5-HTT-im cell bodies were seen in nigral, locus ceruleus, or hypothalamus. However, the transient expression of 5-HTT on non-serotonergic system was seen in cortical and striatal neuroepithelia at E12 and sensory thalamic pathways at P0-P10. Prominent 5-HTT-im fibers in thalamocortical bundles project from sensory thalamic nuclei through reticular nucleus, internal capsule bundle and form barrels in somatosensory cortices. No 5-HTT-im was seen in glia-like cells using currently available antibody. These observations indicate that 5-HTT is: (a) associated preferentially with 5-HT neurons in brainstem, (b) temporally co-expressed with 5-HT in 5-HT neurons, (c) expressed on axons prior to synaptical sites at target neurons, which strongly indicates a volumic (extrasynaptic) transmission, (d) expressed in non-5-HT neurons within a specific window, which may affect the development of the systems "borrowing" the 5-HT. The early appearance of 5-HTT may also endow functionality as well as vulnerabilities of 5-HT, sensory thalamic, and cortical neurons to 5-HTT targeting drugs during pregnancy and after birth.

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Crossref · 10.1016/s0165-3806(99)00152-2

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  • Receptors, transporters as well as synthesizing enzymes are already expressed (~E10 rodent and week 4-5 human) even when the actual axonal projections have not yet arrived in the PFC.

    “Receptors, transporters as well as synthesizing enzymes are already expressed (~E10 rodent and week 4–5 human) even when the actual axonal projections have not yet arrived in the PFC [236–240].”

    From Development of prefrontal cortex (2022) · cites this paper as [236]

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Research works printed but not linked: 3

  1. A. Frazier, J.G. Hensler, Serotonin, in: G.J. Siegel, B.W. Agranoff, R.W. Albers, P.B. Mollinoff (Eds.), Basic Neurochemistry: Melecular, Cellualr and Midical Aspects, 6th edn., Lippincotte-Raven publishing, Philadelphia, PA, 1999, pp. 263–292.
  2. Patel, 1993, Ontogeny and distribution of the serotonin-1A receptor in the developing rat brain, Abstr. Soc. Neurosci., 19, 129.18
  3. Zhou, 1993, Early development of 5-HT fibers, 1a receptors and laminin in cortex and hippocampus of the rats, Abstr. Soc. Neurosci., 19, 129.19

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Authors
Zhou, F. C., Sari, Y., & Zhang, J. K.
Affiliations
Indiana University School of Medicine (US)
Corresponding author
Zhou, Feng C
Venue
Developmental Brain Research
Publisher
Elsevier BV
Published
2000-01
Volume
119
Issue
1
Pages
33-45
ISSN
0165-3806 (ISSN-L)
OpenAlex
W1965084584
Cited by
111
References
47
Citations by year
2026: 1 · 2025: 3 · 2024: 2 · 2023: 3 · 2022: 1 · 2021: 4 · 2020: 4 · 2019: 1 · 2018: 3 · 2017: 3 · 2016: 8 · 2015: 5 · 2014: 1 · 2013: 7 · 2012: 2
FWCI
1.55
Type
journal article
Language
en
Open access
closed
Locations
  • Developmental Brain Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r03mh050602-02)
  • National Institute on Alcohol Abuse and Alcoholism (P50AA07611-11, P50AA007611)
  • National Institute of Mental Health (R03MH50602)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
serotonin transporter, serotonergic neurons, ontogeny, axon trajectory, floor plate, medial forebrain bundle, ganglionic eminence, olfactory bulb, thalamocortical circuits, sensory thalamus
MeSH terms
Animals, Axons, Brain, Brain Mapping, Carrier Proteins, Cerebral Cortex, Dendrites, Gestational Age, Immunohistochemistry, Membrane Glycoproteins, Nerve Fibers, Nerve Tissue Proteins, Neuroglia, Neurons, Organ Specificity, Raphe Nuclei, RNA, Messenger, Serotonin, Thalamus, Rats, Sprague-Dawley, Membrane Transport Proteins, Serotonin Plasma Membrane Transport Proteins, Rats

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