Using a novel PV-Cre rat model to characterize pallidonigral cells and their terminations
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Abstract
In the present study, we generated a novel parvalbumin (PV)-Cre rat model and conducted detailed morphological and electrophysiological investigations of axons from PV neurons in globus pallidus (GP). The GP is considered as a relay nucleus in the indirect pathway of the basal ganglia (BG). Previous studies have used molecular profiling and projection patterns to demonstrate cellular heterogeneity in the GP; for example, PV-expressing neurons are known to comprise approximately 50% of GP neurons and represent majority of prototypic neurons that project to the subthalamic nucleus and/or output nuclei of BG, entopeduncular nucleus and substantia nigra (SN). The present study aimed to identify the characteristic projection patterns of PV neurons in the GP (PV-GP neurons) and determine whether these neurons target dopaminergic or GABAergic neurons in SN pars compacta (SNc) or reticulata (SNr), respectively. We initially found that (1) 57% of PV neurons co-expressed Lim-homeobox 6, (2) the PV-GP terminals were preferentially distributed in the ventral part of dorsal tier of SNc, (3) PV-GP neurons formed basket-like appositions with the somata of tyrosine hydroxylase, PV, calretinin and cholecystokinin immunoreactive neurons in the SN, and (4) in vitro whole-cell recording during optogenetic photo-stimulation of PV-GP terminals in SNc demonstrated that PV-GP neurons strongly inhibited dopamine neurons via GABAA receptors. These results suggest that dopamine neurons receive direct focal inputs from PV-GP prototypic neurons. The identification of high-contrast inhibitory systems on dopamine neurons might represent a key step toward understanding the BG function.
Keywords
Globus pallidus Basal ganglia Dopamine neuron Substantia nigraNotes
Acknowledgements
We thank Dr. N. Tamamaki (Kumamoto University) for providing the PV-Cre transgene construct.
Compliance and ethical standards
Conflict of interest
The authors declare no competing financial interest.
Funding
This study was funded by Grants-in-Aid from The Ministry of Education, Culture, Sports, Science, and Technology (MEXT) for Scientific Research (25282247 and 15K12770 to FF; 26350983 and 16H01622 to FK; 25560435, 16H02840, 16H01623, 16K13115, 16H06543 to ST); MIC SCOPE (152107008) to ST; and for Scientific Researches on Innovative Areas “Adaptive Circuit Shift” (26112001) to FF.
Supplementary material
References
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