Cited by 175Neuroscience and Neuropharmacology ResearchNeurotransmitter Receptor Influence on BehaviorDeep Brain Stimulation and Movement Disorders

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Cholinergic Interneurons Mediate Fast VGluT3-Dependent Glutamatergic Transmission in the Striatum

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Abstract

The neurotransmitter glutamate is released by excitatory projection neurons throughout the brain. However, non-glutamatergic cells, including cholinergic and monoaminergic neurons, express markers that suggest that they are also capable of vesicular glutamate release. Striatal cholinergic interneurons (CINs) express the Type-3 vesicular glutamate transporter (VGluT3), although whether they form functional glutamatergic synapses is unclear. To examine this possibility, we utilized mice expressing Cre-recombinase under control of the endogenous choline acetyltransferase locus and conditionally expressed light-activated Channelrhodopsin2 in CINs. Optical stimulation evoked action potentials in CINs and produced postsynaptic responses in medium spiny neurons that were blocked by glutamate receptor antagonists. CIN-mediated glutamatergic responses exhibited a large contribution of NMDA-type glutamate receptors, distinguishing them from corticostriatal inputs. CIN-mediated glutamatergic responses were insensitive to antagonists of acetylcholine receptors and were not seen in mice lacking VGluT3. Our results indicate that CINs are capable of mediating fast glutamatergic transmission, suggesting a new role for these cells in regulating striatal activity.

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Crossref · 10.1371/journal.pone.0019155

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Figures

Figure 1 ChR2-mediated activation of striatal cholinergic interneurons. (Ai) Confocal image of mCherry-positive ChR2-expressing neurons in the dorsal striatum of a ChAT-IRES-Cre mouse injected with AAV encoding DFI-ChR2-mCherry. (Aii) Fluorescence immunohistochemical staining for ChAT reveals cholinergic neurons. (Aiii) Merged image. (B) inset, Schematic diagram of the recording conditions: cell-attached recordings were made from ChR2-expressing CINs (red) in the dorsal striatum and blue light was delivered to the surrounding area (blue circle) through the microscope objective. main panel, Example action potential recorded in cell-attached mode from a ChR2-expressing CIN evoked by a 4 ms pulse of 473 nm light.
Figure 1 ChR2-mediated activation of striatal cholinergic interneurons. (Ai) Confocal image of mCherry-positive ChR2-expressing neurons in the dorsal striatum of a ChAT-IRES-Cre mouse injected with AAV encoding DFI-ChR2-mCherry. (Aii) Fluorescence immunohistochemical staining for ChAT reveals cholinergic neurons. (Aiii) Merged image. (B) inset, Schematic diagram of the recording conditions: cell-attached recordings were made from ChR2-expressing CINs (red) in the dorsal striatum and blue light was delivered to the surrounding area (blue circle) through the microscope objective. main panel, Example action potential recorded in cell-attached mode from a ChR2-expressing CIN evoked by a 4 ms pulse of 473 nm light.CC BY · PubMed Central
Figure 2 Light-evoked CIN action potentials evoke glutamatergic responses in MSNs. (A) inset, Schematic diagram of the recording conditions: whole-cell recordings were made from MSNs that neighbored ChR2-expressing CINs (red). The blue circle indicates the region stimulated by blue light. main panel, Example EPSP recorded in an MSN in response to a 4 ms light pulse (blue bar). (B) Amplitudes of light-evoked EPSPs in the presence of antagonists of GABAA (Picrotoxin, Ptx), muscarinic (Scopolamine, Scop), and nicotinic (Mecamylamine, Mec) receptors and following application of the AMPA/kainate glutamate receptor antagonist NBQX. (C) Example of light evoked (blue bar) CIN-mediated EPSCs in a voltage-clamped MSN at holding potentials of −70 and +40 mV demonstrating the large current that is visible more than 100 ms after the light pulse at +40 mV. The amplitudes of the rapid −70 and prolonged +40 mV EPSC components were measured in the periods indicated by the gray bars. (D) Confocal image of mCherry-positive ChR2-expressing fibers in the motor cortex, white matter (WM) and underlying striatum (Str). Large bundles of corticofugal fibers (white arrowheads) and diffuse small axonal collaterals are visible throughout the dorsolateral striatum. Scale bar 200 µm. (E) inset, Schematic diagram of the recording conditions: whole-cell recordings were made from MSNs neighboring ChR2-expressing corticostriatal fibers (red), and blue light was delivered to the region indicated by the blue circle. main panel, Example EPSCs recorded in an MSN in response to a blue light pulse at the indicated holding potentials. (F) left, Average amplitudes of light-evoked EPSCs measured in MSNs held at either −70 or +40 mV in response to ChR2-mediated activation of either CINs or corticostriatal fibers (Cx). right, Average ratio of +40/−70 mV current amplitudes measured following ChR2-mediated activation of either CINs or corticostriatal fibers.
Figure 2 Light-evoked CIN action potentials evoke glutamatergic responses in MSNs. (A) inset, Schematic diagram of the recording conditions: whole-cell recordings were made from MSNs that neighbored ChR2-expressing CINs (red). The blue circle indicates the region stimulated by blue light. main panel, Example EPSP recorded in an MSN in response to a 4 ms light pulse (blue bar). (B) Amplitudes of light-evoked EPSPs in the presence of antagonists of GABAA (Picrotoxin, Ptx), muscarinic (Scopolamine, Scop), and nicotinic (Mecamylamine, Mec) receptors and following application of the AMPA/kainate glutamate receptor antagonist NBQX. (C) Example of light evoked (blue bar) CIN-mediated EPSCs in a voltage-clamped MSN at holding potentials of −70 and +40 mV demonstrating the large current that is visible more than 100 ms after the light pulse at +40 mV. The amplitudes of the rapid −70 and prolonged +40 mV EPSC components were measured in the periods indicated by the gray bars. (D) Confocal image of mCherry-positive ChR2-expressing fibers in the motor cortex, white matter (WM) and underlying striatum (Str). Large bundles of corticofugal fibers (white arrowheads) and diffuse small axonal collaterals are visible throughout the dorsolateral striatum. Scale bar 200 µm. (E) inset, Schematic diagram of the recording conditions: whole-cell recordings were made from MSNs neighboring ChR2-expressing corticostriatal fibers (red), and blue light was delivered to the region indicated by the blue circle. main panel, Example EPSCs recorded in an MSN in response to a blue light pulse at the indicated holding potentials. (F) left, Average amplitudes of light-evoked EPSCs measured in MSNs held at either −70 or +40 mV in response to ChR2-mediated activation of either CINs or corticostriatal fibers (Cx). right, Average ratio of +40/−70 mV current amplitudes measured following ChR2-mediated activation of either CINs or corticostriatal fibers.CC BY · PubMed Central
Figure 3 CIN-mediated glutamatergic currents in MSNs require VGluT3 expression. (A) Example light-evoked EPSCs at 32–34°C in an MSN held at −70 or +40 mV in an acute striatal slice of a DFI-ChR2-mCherry AAV injected ChAT-IRES-Cre mouse. (B) As in Panel A, showing recordings at 32–34°C obtained from an MSN in an acute slice of a DFI-ChR2-mCherry AAV injected GM60 mouse that expresses Cre under control of a BAC spanning the ChAT genomic locus. (C) As in Panel B, showing failures to evoke EPSCs in an MSN of a DFI-ChR2-mCherry AAV injected GM60; VGluT3−/− mouse. (D) Average light-evoked EPSC amplitudes measured in MSNs at holding potentials of −70 and +40 mV in acute slices prepared from mice of the indicated genotypes.
Figure 3 CIN-mediated glutamatergic currents in MSNs require VGluT3 expression. (A) Example light-evoked EPSCs at 32–34°C in an MSN held at −70 or +40 mV in an acute striatal slice of a DFI-ChR2-mCherry AAV injected ChAT-IRES-Cre mouse. (B) As in Panel A, showing recordings at 32–34°C obtained from an MSN in an acute slice of a DFI-ChR2-mCherry AAV injected GM60 mouse that expresses Cre under control of a BAC spanning the ChAT genomic locus. (C) As in Panel B, showing failures to evoke EPSCs in an MSN of a DFI-ChR2-mCherry AAV injected GM60; VGluT3−/− mouse. (D) Average light-evoked EPSC amplitudes measured in MSNs at holding potentials of −70 and +40 mV in acute slices prepared from mice of the indicated genotypes.CC BY · PubMed Central

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Metadata

Authors
Higley, M. J., Gittis, A. H., Oldenburg, I. A., Balthasar, N., Seal, R. P., Edwards, R. H., Lowell, B. B., Kreitzer, A. C., & Sabatini, B. L.
Affiliations
  • Howard Hughes Medical Institute (US)
  • University of California, San Francisco (US)
  • Beth Israel Deaconess Medical Center (US)
Corresponding author
Sabatini, Bernardo L.
Venue
PLoS ONE
Published
2011-04-22
Volume
6
Issue
4
Pages
e19155
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2137833675
Cited by
175
References
35
Citations by year
2026: 4 · 2025: 6 · 2024: 8 · 2023: 10 · 2022: 14 · 2021: 11 · 2020: 14 · 2019: 10 · 2018: 12 · 2017: 16 · 2016: 14 · 2015: 16 · 2014: 12 · 2013: 10 · 2012: 13
FWCI
5.30
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Explore Bristol Research (publishedVersion)
  • Figshare (submittedVersion, cc-by)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • KiltHub Repository (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
  • Bristol Research (University of Bristol) (submittedVersion)
  • KiltHub Repository (cc-by)
Funders
  • Howard Hughes Medical Institute
  • W. M. Keck Foundation
  • Parkinson's Disease Foundation
  • National Alliance for Research on Schizophrenia and Depression
  • National Institutes of Health (DK057521, DK046200, DA10154, NS046579)
  • National Institute of Mental Health (F32MH068085, MH50712, R01MH050712, R37MH050712, F31MH093026)
  • National Institute on Drug Abuse (P01DA010154, DA-10154)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK057521, R01DK075632, P30DK046200, DK075632)
  • National Institute of Neurological Disorders and Stroke (NS064984, R01NS046579, F32NS063663, R01NS064984, R37NS046579, NS063663, NS046579)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Health Sciences › Medicine › Clinical Neurology › Deep Brain Stimulation and Movement Disorders
Keywords
cholinergic interneurons, striatum, VGLUT3, glutamatergic neurotransmission, medium spiny neurons, NMDA receptor, choline acetyltransferase, channelrhodopsin-2, optogenetic stimulation
MeSH terms
Channelrhodopsins, Central Nervous System Stimulants, Animals, Corpus Striatum, Evoked Potentials, Female, Interneurons, Male, Mecamylamine, Picrotoxin, Receptors, Cholinergic, Scopolamine, Receptors, N-Methyl-D-Aspartate, Amino Acid Transport Systems, Acidic, Mice

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