Cited by 51Neuroscience and Neuropharmacology ResearchCellular transport and secretionNeurotransmitter Receptor Influence on Behavior

Three-photon microscopy shows that somatic release can be a quantitatively significant component of serotonergic neurotransmission in the mammalian brain

Kaushalya, S.K., Desai, R., Arumugam, S., Ghosh, H., Balaji, J., Maiti, S.·2008·Journal of Neuroscience Research

Abstract

Recent experiments on monoaminergic neurons have shown that neurotransmission can originate from somatic release. However, little is known about the quantity of monoamine available to be released through this extrasynaptic pathway or about the intracellular dynamics that mediate such release. Using three-photon microscopy, we directly imaged serotonin autofluorescence and investigated the total serotonin content, release competence, and release kinetics of somatic serotonergic vesicles in the dorsal raphe neurons of the rat. We found that the somata of primary cultured neurons contain a large number of serotonin-filled vesicles arranged in a perinuclear fashion. A similar distribution is also observed in fresh tissue slice preparations obtained from the rat dorsal raphe. We estimate that the soma of a cultured neuron on an average contains about 9 fmoles of serotonin in about 450 vesicles (or vesicle clusters) of < or =370 nm average diameter. A substantial fraction (>30%) of this serotonin is released with a time scale of several minutes by K(+)-induced depolarization or by para-chloroamphetamine treatment. The amount of releasable serotonin stored in the somatic vesicles is comparable to the total serotonin content of all the synaptic vesicles in a raphe neuron, indicating that somatic release can potentially play a major role in serotonergic neurotransmission in the mammalian brain.

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Crossref · 10.1002/jnr.21794

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  • 5-HT can be released somatodendritically and from 5-HT axon terminals in the DRN.

    “As 5-HT can be released somatodendritically and from 5-HT axon terminals in the DRN (Colgan et al., 2012; de Kock et al., 2006; Kaushalya et al., 2008), we examined the expression patterns of 5-HT receptors in the dataset to infer local 5-HT signaling.”

    From Molecular and anatomical organization of the dorsal raphe nucleus (2019) · cites this paper as Kaushalya et al., 2008

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Authors
Kaushalya, S. K., Desai, R., Arumugam, S., Ghosh, H., Balaji, J., & Maiti, S.
Affiliations
  • Tata Institute of Fundamental Research (IN)
  • University of California, Los Angeles (US)
Corresponding author
Maiti, S.
Venue
Journal of Neuroscience Research
Publisher
Wiley
Published
2008-08-15
Volume
86
Issue
15
Pages
3469-3480
ISSN
  • 0360-4012 (ISSN-L)
  • 1097-4547
OpenAlex
W2088872749
Cited by
50
References
50
Citations by year
2024: 2 · 2023: 3 · 2022: 1 · 2021: 2 · 2020: 3 · 2019: 4 · 2018: 4 · 2017: 3 · 2016: 2 · 2015: 7 · 2014: 4 · 2013: 3 · 2012: 8
FWCI
0.58
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neuroscience Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
Wellcome Trust (05995/Z/99/Z/HH/KO)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
serotonergic neurotransmission, dorsal raphe neurons, monoaminergic neurons, serotonin storage, release kinetics, potassium depolarization, three-photon microscopy
MeSH terms
Animals, Brain, Cells, Cultured, Female, Immunohistochemistry, Microscopy, Microscopy, Fluorescence, Synaptic Transmission, Neurons, Organ Culture Techniques, Serotonin, Vacuoles, Rats, Wistar, Rats

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