Cited by 118Neuroinflammation and Neurodegeneration MechanismsPharmacological Receptor Mechanisms and EffectsNeuroscience and Neuropharmacology Research

Neuronal activity increases translocator protein (TSPO) levels

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Notter, Tina, Schalbetter, Sina M., Clifton, Nicholas E., Mattei, Daniele, Richetto, Juliet, Thomas, Kerrie, Meyer, Urs, Hall, Jeremy·2021·Molecular Psychiatry

Abstract

The mitochondrial protein, translocator protein (TSPO), is a widely used biomarker of neuroinflammation, but its non-selective cellular expression pattern implies roles beyond inflammatory processes. In the present study, we investigated whether neuronal activity modifies TSPO levels in the adult central nervous system. First, we used single-cell RNA sequencing to generate a cellular landscape of basal TSPO gene expression in the hippocampus of adult (12 weeks old) C57BL6/N mice, followed by confocal laser scanning microscopy to verify TSPO protein in neuronal and non-neuronal cell populations. We then quantified TSPO mRNA and protein levels after stimulating neuronal activity with distinct stimuli, including designer receptors exclusively activated by designer drugs (DREADDs), exposure to a novel environment and acute treatment with the psychostimulant drug, amphetamine. Single-cell RNA sequencing demonstrated a non-selective and multi-cellular gene expression pattern of TSPO at basal conditions in the adult mouse hippocampus. Confocal laser scanning microscopy confirmed that TSPO protein is present in neuronal and non-neuronal (astrocytes, microglia, vascular endothelial cells) cells of cortical (medial prefrontal cortex) and subcortical (hippocampus) brain regions. Stimulating neuronal activity through chemogenetic (DREADDs), physiological (novel environment exposure) or psychopharmacological (amphetamine treatment) approaches led to consistent increases in TSPO gene and protein levels in neurons, but not in microglia or astrocytes. Taken together, our findings show that neuronal activity has the potential to modify TSPO levels in the adult central nervous system. These findings challenge the general assumption that altered TSPO expression or binding unequivocally mirrors ongoing neuroinflammation and emphasize the need to consider non-inflammatory interpretations in some physiological or pathological contexts.

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Authors
Notter, T., Schalbetter, S. M., Clifton, N. E., Mattei, D., Richetto, J., Thomas, K., Meyer, U., & Hall, J.
Affiliations
  • Cardiff University (GB)
  • University of Zurich (CH)
Corresponding author
Notter, Tina
Venue
Molecular Psychiatry
Published
2020-05-12
Volume
26
Issue
6
Pages
2025-2037
ISSN
  • 1359-4184 (ISSN-L)
  • 1476-5578
OpenAlex
W3016299128
Cited by
118
References
65
Citations by year
2026: 9 · 2025: 13 · 2024: 24 · 2023: 20 · 2022: 20 · 2021: 24 · 2020: 8
FWCI
6.97
Type
journal article
Language
en
Open access
Locations
  • Molecular Psychiatry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (acceptedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, cc-by)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, cc-by)
  • Zurich Open Repository and Archive (University of Zurich)
Funders
  • National Science Foundation
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (PZ00P3_18009/1, 188524, 174868, 310030)
  • Universität Zürich
  • Medical Research Council (MR/L010305/1)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pharmacological Receptor Mechanisms and Effects
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
translocator protein (TSPO), neuronal activity, neuroinflammation biomarkers, hippocampus, medial prefrontal cortex, amphetamine, astrocytes, microglia, vascular endothelial cells, single-cell RNA sequencing
MeSH terms
Animals, Neurons, Microglia, Receptors, GABA, Endothelial Cells, Positron-Emission Tomography, Mice

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