Cited by 26Neurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology ResearchCellular transport and secretion

An interplay between the serotonin transporter (SERT) and 5-HT receptors controls stimulus-secretion coupling in sympathoadrenal chromaffin cells

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Brindley, Rebecca L., Bauer, Mary Beth, Blakely, Randy D., Currie, Kevin P.M.·2016·Neuropharmacology

Abstract

Adrenal chromaffin cells (ACCs), the neuroendocrine arm of the sympathetic nervous system, secrete catecholamines to mediate the physiological response to stress. Although ACCs do not synthesize 5-HT, they express the serotonin transporter (SERT). Genetic variations in SERT are linked to several CNS disorders but the role(s) of SERT/5-HT in ACCs has remained unclear. Adrenal glands from wild-type mice contained 5-HT at ≈ 750 fold lower abundance than adrenaline, and in SERT(-/-) mice this was reduced by ≈80% with no change in catecholamines. Carbon fibre amperometry showed that SERT modulated the ability of 5-HT1A receptors to inhibit exocytosis. 5-HT reduced the number of amperometric spikes (vesicular fusion events) evoked by KCl in SERT(-/-) cells and wild-type cells treated with escitalopram, a SERT antagonist. The 5-HT1A receptor antagonist WAY100635 blocked the inhibition by 5-HT which was mimicked by the 5-HT1A agonist 8-OH-DPAT but not the 5-HT1B agonist CP93129. There was no effect on voltage-gated Ca(2+) channels, K(+) channels, or intracellular [Ca(2+)] handling, showing the 5-HT receptors recruit an atypical inhibitory mechanism. Spike charge and kinetics were not altered by 5-HT receptors but were reduced in SERT(-/-) cells compared to wild-type cells. Our data reveal a novel role for SERT and suggest that adrenal chromaffin cells might be a previously unrecognized hub for serotonergic control of the sympathetic stress response.

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Crossref · 10.1016/j.neuropharm.2016.08.015

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Authors
Brindley, R. L., Bauer, M. B., Blakely, R. D., & Currie, K. P. M.
Affiliations
Vanderbilt University (US)
Corresponding author
Currie, Kevin P.M.
Venue
Neuropharmacology
Publisher
Elsevier BV
Published
2016-11
Volume
110
Issue
Pt A
Pages
438-448
ISSN
0028-3908 (ISSN-L)
OpenAlex
W2513237461
Cited by
26
References
62
Citations by year
2025: 4 · 2023: 7 · 2022: 2 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 3
FWCI
1.68
Type
journal article
Language
en
Open access
Locations
  • Neuropharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (R21 NS081429, P50 M096972)
  • Department of Anesthesiology at Vanderbilt University Medical Center
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 › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
serotonin transporter, 5-HT1A receptor, adrenal chromaffin cells, catecholamine release, stimulus-secretion coupling, exocytosis, vesicle fusion, SERT knockout mice, WAY-100635, 8-OH-DPAT, escitalopram
MeSH terms
Adrenal Glands, Animals, Calcium, Cations, Divalent, Cells, Cultured, Exocytosis, Male, Membrane Potentials, Mice, Inbred C57BL, Receptors, Serotonin, Serotonin, Mice, Knockout, Serotonin Agents, Chromaffin Cells, Calcium Channels, N-Type, Potassium Channels, Voltage-Gated, Serotonin Plasma Membrane Transport Proteins

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