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Group I metabotropic glutamate receptors in the primate motor thalamus: subsynaptic association with cortical and sub-cortical glutamatergic afferents

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Abstract

Preclinical evidence indicates that mGluR5 is a potential therapeutic target for Parkinson’s disease and L-DOPA-induced dyskinesia. However, the mechanisms through which these therapeutic benefits are mediated remain poorly understood. Although the regulatory role of mGluR5 on glutamatergic transmission has been examined in various basal ganglia nuclei, very little is known about the localization and function of mGluR5 in the ventral motor and intralaminar thalamic nuclei, the main targets of basal ganglia output in mammals. Thus, we used immuno-electron microscopy to map the cellular and subcellular localization of group I mGluRs (mGluR1a and mGluR5) in the ventral motor and caudal intralaminar thalamic nuclei in rhesus monkeys. Furthermore, using double immuno-electron microscopy, we examined the subsynaptic localization of mGluR5 in relation to cortical and sub-cortical glutamatergic afferents. Four major conclusions can be drawn from these data. First, mGluR1a and mGluR5 are expressed postsynaptically on the plasma membrane of dendrites of projection neurons and GABAergic interneurons in the basal ganglia- and cerebellar-receiving regions of the ventral motor thalamus and in CM. Second, the plasma membrane-bound mGluR5 immunoreactivity is preferentially expressed perisynaptically at the edges of cortical and sub-cortical glutamatergic afferents. Third, the mGluR5 immunoreactivity is more strongly expressed in the lateral than the medial tiers of CM, suggesting a preferential association with thalamocortical over thalamostriatal neurons in the primate CM. Overall, mGluR5 is located to subserve powerful modulatory role of cortical and subcortical glutamatergic transmission in the primate ventral motor thalamus and CM.

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Acknowledgements

Thanks are due to Jean-Francois Pare and Susan Jenkins for technical assistance.

Funding

This work was supported by the UDALL Center of Excellence Grant from the National Institutes of Health (P50NS098685 to YS) and the NIH/ORIP base Grant to the Yerkes Primate Center (P51OD011132).

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Correspondence to Gunasingh Jeyaraj Masilamoni.

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The authors declare that they have no conflict of interest.

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All animal procedures were approved by the Institutional Animal Care and Use Committee (IACUC) of Emory University, and were performed according to the Guide for the Care and Use of Laboratory Animals and the U.S. Public Health Service Policy on the Humane Care and Use of Laboratory Animals.

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Masilamoni, G.J., Smith, Y. Group I metabotropic glutamate receptors in the primate motor thalamus: subsynaptic association with cortical and sub-cortical glutamatergic afferents. Brain Struct Funct 224, 2787–2804 (2019). https://doi.org/10.1007/s00429-019-01937-2

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  • DOI: https://doi.org/10.1007/s00429-019-01937-2

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