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Histamine H3 Receptor Activation Modulates Glutamate Release in the Corticostriatal Synapse by Acting at CaV2.1 (P/Q-Type) Calcium Channels and GIRK (KIR3) Potassium Channels

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Abstract

The striatum is innervated by histaminergic fibers and expresses a high density of histamine H3 receptors (H3Rs), present on medium spiny neurons (MSNs) and corticostriatal afferents. In this study, in sagittal slices from the rat dorsal striatum, excitatory postsynaptic potentials (EPSPs) were recorded in MSNs after electrical stimulation of corticostriatal axons. The effect of H3R activation and blockers of calcium and potassium channels was evaluated with the paired-pulse facilitation protocol. In the presence of the H3R antagonist/inverse agonist clobenpropit (1 μM), the H3R agonist immepip (1 μM) had no effect on the paired-pulse ratio (PPR), but in the absence of clobenpropit, immepip induced a significant increase in PPR, accompanied by a reduction in EPSP amplitude, suggesting presynaptic inhibition. The blockade of CaV2.1 (P/Q-type) channels with ω-agatoxin TK (400 nM) increased PPR and prevented the effect of immepip. The CaV2.2 (N-type) channel blocker ω-conotoxin GVIA (1 μM) also increased PPR, but did not occlude the immepip action. Functional KIR3 channels are present in corticostriatal terminals, and in experiments in which immepip increased PPR, the KIR3 blocker tertiapin-Q (30 nM) prevented the effect of the H3R agonist. These results indicate that the presynaptic modulation by H3Rs of corticostriatal synapses involves the inhibition of Cav2.1 calcium channels and the activation of KIR3 potassium channels.

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Data Availability

Data can be obtained upon request to the corresponding author.

Abbreviations

D1-MSN:

D1 receptor-expressing medium spiny neuron

D2-MSN:

D2 receptor-expressing medium spiny neuron

EPSP:

Excitatory postsynaptic potential

GIRK:

G protein-activated inwardly rectifying potassium channel

H3R:

Histamine H3 receptor;

MSN:

Medium spiny neuron

PPR:

Paired-pulse ratio

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Acknowledgement

The acquisition software in LabViewTM was developed by Jesus Perez Ortega at IFC- UNAM.

Funding

This work was supported by Dirección General de Asuntos del Personal Académico (DGAPA), Universidad Nacional Autónoma de México (UNAM), Grant IN216019 to JB.

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Authors and Affiliations

Authors

Contributions

HV-V and CG-S: Investigated, performed, and analyzed all electrophysiological experiments. AVV: Investigation, results discussion, edited the manuscript, and helped to write the manuscript. J-AA-M: Conceived the idea, designed, supervised, and coordinated the project, analyzed the results, and wrote the manuscript. JB: Conceptualization, designed the experiments, methodology, formal analysis, analyzed the results, and wrote the manuscript. JB and J-AA-M contributed equally to this work.

Corresponding author

Correspondence to Jaime Barral.

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The authors declare that there is no conflict of interests regarding the publication of this paper.

Ethics Approval

All procedures were conducted in accordance with the ‘Guidelines for the Use of Animals in Neuroscience Research’ endorsed by the Society for Neuroscience, the declaration of Helsinki, the Official Mexican Norm 062–1999 and the guidelines approved by the Ethics Committee (CE/FESI/042019/1266) of Universidad Nacional Autónoma de México (UNAM).

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Vázquez-Vázquez, H., Gonzalez-Sandoval, C., Vega, A.V. et al. Histamine H3 Receptor Activation Modulates Glutamate Release in the Corticostriatal Synapse by Acting at CaV2.1 (P/Q-Type) Calcium Channels and GIRK (KIR3) Potassium Channels. Cell Mol Neurobiol 42, 817–828 (2022). https://doi.org/10.1007/s10571-020-00980-6

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  • DOI: https://doi.org/10.1007/s10571-020-00980-6

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