Cited by 228Neurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology ResearchIon Transport and Channel Regulation

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p38 MAPK Activation Elevates Serotonin Transport Activity via a Trafficking-independent, Protein Phosphatase 2A-dependent Process

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Abstract

Presynaptic, plasma membrane serotonin (5-hydroxytryptamine; 5-HT) transporters (SERTs) clear 5-HT following vesicular release and are regulated through trafficking-dependent pathways. Recently, we provided evidence for a trafficking-independent mode of SERT regulation downstream of adenosine receptor (AR) activation that is sensitive to p38 MAPK inhibitors. Here, we probe this pathway in greater detail, demonstrating elevation of 5-HT transport by multiple p38 MAPK activators (anisomycin, H(2)O(2), and UV radiation), in parallel with p38 MAPK phosphorylation, as well as suppression of anisomycin stimulation by p38 MAPK siRNA treatments. Studies with transporter-transfected Chinese hamster ovary cells reveal that SERT stimulation is shared with the human norepinephrine transporter but not the human dopamine transporter. Saturation kinetic analyses of anisomycin-SERT activity reveal a selective reduction in 5-HT K(m) supported by a commensurate increase in 5-HT potency (K(i)) for displacing surface antagonist binding. Anisomycin treatments that stimulate SERT activity do not elevate surface SERT surface density whereas stimulation is lost with preexposure of cells to the surface-SERT inactivating reagent, 2-(trimethylammonium)ethyl methane thiosulfonate. Guanylyl cyclase (1H-(1,2,4)-oxadiazolo[4,3-a]-quinoxalin-1-one) and protein kinase G inhibitors (H8, DT-2) block AR stimulation of SERT yet fail to antagonize SERT stimulation by anisomycin. We thus place p38 MAPK activation downstream of protein kinase G in a SERT-catalytic regulatory pathway, distinct from events controlling SERT surface density. In contrast, the activity of protein phosphatase 2A inhibitors (fostriecin and calyculin A) to attenuate anisomycin stimulation of 5-HT transport suggests that protein phosphatase 2A is a critical component of the pathway responsible for p38 MAPK up-regulation of SERT catalytic activity.

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  1. Launay, 1994, Am. J. Physiol., 266, R526
  2. Apparsundaram, 2001, J. Pharmacol. Exp. Ther., 299, 666
  3. Somwar, 2001, Biochem. J., 359, 639, 10.1042/bj3590639 · DOI
  4. Giros, 1992, Mol. Pharmacol., 42, 383
  5. Whitworth, 2002, J. Neurosci., 22, 1

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Metadata

Authors
Zhu, C.-B., Carneiro, A. M., Dostmann, W. R., Hewlett, W. A., & Blakely, R. D.
Affiliations
  • Vanderbilt University (US)
  • University of Vermont (US)
Corresponding author
Blakely, Randy D.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2005-04
Volume
280
Issue
16
Pages
15649-15658
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2124241220
Cited by
228
References
70
Citations by year
2026: 4 · 2025: 3 · 2024: 6 · 2023: 3 · 2022: 6 · 2021: 11 · 2020: 9 · 2019: 8 · 2018: 11 · 2017: 5 · 2016: 13 · 2015: 15 · 2014: 12 · 2013: 17 · 2012: 20
FWCI
5.18
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Vanderbilt University
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (HL 68991, R01HL068991)
  • National Institute of Mental Health (T32MH065782, T32-MH65782-02)
  • National Institute on Drug Abuse (DA-07390, R01DA007390)
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 › Molecular Biology › Ion Transport and Channel Regulation
Keywords
serotonin transporter, p38 MAPK, protein phosphatase 2A, anisomycin, adenosine receptors, protein kinase G, norepinephrine transporter, dopamine transporter, guanylyl cyclase inhibition, H8
MeSH terms
Animals, Cell Membrane, Cricetinae, Humans, Membrane Glycoproteins, Nerve Tissue Proteins, Phosphoprotein Phosphatases, Serotonin, Enzyme Activators, Membrane Transport Proteins, p38 Mitogen-Activated Protein Kinases, Serotonin Plasma Membrane Transport Proteins, Protein Phosphatase 2

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