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mGluR4-containing corticostriatal terminals: synaptic interactions with direct and indirect pathway neurons in mice

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Abstract

Glutamatergic afferents from the cerebral cortex are the main excitatory drive of striatal projection neurons. The metabotropic glutamate receptor 4 (mGluR4) presynaptically modulates transmission at corticostriatal synapses, and is considered as a potent drug target for Parkinson’s disease and other brain disorders. To better characterize the anatomical substrate that underlies the functional effects of mGluR4 in the striatum, we undertook electron microscopic localization studies of mGluR4 expression in the mouse striatum. Our data demonstrate that more than 80 % mGluR4-immunoreactive structures are accounted for by unmyelinated axons and axon terminals, and that almost 50 % putative glutamatergic terminals (i.e. forming asymmetric synapses) express mGluR4 in the mouse striatum. Using vGluT1 as a presynaptic marker of glutamatergic corticostriatal boutons, our findings indicate: (1) all striatal mGluR4-positive terminals co-express vGluT1 immunoreactivity, (2) 44.3 % total striatal glutamatergic terminals co-express vGluT1 and mGluR4, and (3) mGluR4 is expressed in 73.4 % of total striatal vGluT1-positive terminals. To determine if mGluR4 terminals target preferentially direct vs. indirect pathway neurons, mGluR4 immunostaining was combined with D1 receptor immunoreactivity. These data showed that around 30 % mGluR4-immunoreactive glutamatergic terminals target D1 receptor-positive spines (i.e. direct pathway neurons), while almost 70 % formed synapses with D1 receptor-negative spines (i.e. putative indirect pathway neurons). Thus, these immuno-electron microscopic studies suggest that pre-synaptic mGluR4 in striatal glutamatergic terminals is expressed almost exclusively in cortical boutons to subserve regulatory influences upon a large contingent of corticostriatal terminals that preferentially target putative “indirect” pathway striatal projection neurons in mice. These observations provide a rationale for the use of mGluR4 allosteric potentiator as a potential therapy in Parkinson’s disease.

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Acknowledgments

This work was supported by grants from the National Institute of Health to YS (R01 NS037423; R01NS037948) and the Yerkes National Primate Center NIH base grant (P51-OD011132). Thanks are due to Susan Jenkins and Jean-Francois Pare for technical assistance.

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  1. Liliya Iskhakova

    Present address: Department of Medical Neurobiology (Physiology), The Hebrew University-Hadassa Medical School, P.O. Box 12272, Jerusalem, 91120, Israel

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  1. Yerkes National Primate Research Center, Department of Neurology, UDALL Center of Excellence for Parkinson’s Disease, Emory University, 954, Gatewood RD NE, Atlanta, GA, 30329, USA

    Liliya Iskhakova & Yoland Smith

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Correspondence to Yoland Smith.

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Iskhakova, L., Smith, Y. mGluR4-containing corticostriatal terminals: synaptic interactions with direct and indirect pathway neurons in mice. Brain Struct Funct 221, 4589–4599 (2016). https://doi.org/10.1007/s00429-016-1187-z

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