Abstract
Recent studies have found that in the cerebellum, the δ2 glutamate receptor (GluRδ2) plays a key role in regulating the differentiation of parallel fiber-Purkinje synapses and mediating key physiological functions in the granule cell-Purkinje cell circuit. In the hotfoot mutant or GluRδ2 knockout mice, the absence of GluRδ2 expression results in impaired motor-related tasks, ataxia, and disruption of long-term depression at parallel fiber-Purkinje cell synapses. The goal of this study was to determine the long-term consequences of deletion of GluRδ2 expression in the hotfoot mutant (GluRδ2ho/ho) on Purkinje and granule cell survival and Purkinje cell dendritic differentiation. Quantitative estimates of Purkinje and granule cell numbers in 3-, 12-, and 20-month-old hotfoot mutants and wild-type controls showed that Purkinje cell numbers are within control values at 3 and 12 months in the hotfoot mutant but reduced by 20 % at 20 months compared with controls. In contrast, the number of granule cells is significantly reduced from 3 months onwards in GluRδ2ho/ho mutant mice compared to wild-type controls. Although the overall structure of Purkinje cell dendrites does not appear to be altered, there is a significant 27 % reduction in the cross-sectional area of Purkinje cell dendritic trees in the 20-month-old GluRδ2ho/ho mutants. The interpretation of the results is that the GluRδ2 receptor plays an important role in the long-term organization of the granule-Purkinje cell circuit through its involvement in the regulation of parallel fiber-Purkinje cell synaptogenesis and in the normal functioning of this critical cerebellar circuit.
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Acknowledgments
This work was supported by a UPMC LIA (Laboratoire international associé) grant to JM and by a visiting professor grant of UPMC to MWV. We thank Corinne Nantet for her histological assistance. This article was prepared while MWV was employed at the University of Maryland School of Medicine. The opinions expressed in this article are the authors’ own and do not reflect the view of the National Institutes of Health, the Department of Health and Human Services, or the US government.
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All authors had full access to the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Hadi Zanjani, Michael W. Vogel, and Jean Mariani were responsible for the study concept and design; Hadi Zanjani for the acquisition of data; Hadi Zanjani, Michael W. Vogel, and Jean Mariani for the analysis and interpretation of data; Hadi Zanjani and Michael W. Vogel for the drafting of the manuscript; Hadi Zanjani, Michael W. Vogel, and Jean Mariani for the critical revision of the manuscript for intellectual content; Hadi Zanjani and Michael W. Vogel for the statistical analysis; Jean Mariani for the obtained funding; Hadi Zanjani and Jean Mariani for the administrative, technical, and material support; and Hadi Zanjani, Michael W. Vogel, and Jean Mariani for the study supervision.
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Zanjani, H.S., Vogel, M.W. & Mariani, J. Deletion of the GluRδ2 Receptor in the Hotfoot Mouse Mutant Causes Granule Cell Loss, Delayed Purkinje Cell Death, and Reductions in Purkinje Cell Dendritic Tree Area. Cerebellum 15, 755–766 (2016). https://doi.org/10.1007/s12311-015-0748-7
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DOI: https://doi.org/10.1007/s12311-015-0748-7