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Evidence for limited D1 and D2 receptor coexpression and colocalization within the dorsal striatum of the neonatal mouse
Author(s) -
Biezonski Dominik K.,
Trifilieff Pierre,
Meszaros Jozsef,
Javitch Jonathan A.,
Kellendonk Christoph
Publication year - 2015
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.23730
Subject(s) - striatum , biology , colocalization , basal ganglia , neuroscience , dopamine receptor d2 , medium spiny neuron , dopamine , indirect pathway of movement , ventral striatum , tyrosine hydroxylase , receptor , direct pathway of movement , central nervous system , genetics
The striatum is the major input nucleus of the basal ganglia involved in reward processing, goal‐directed behaviors, habit learning, and motor control. The striatum projects to the basal ganglia output nuclei via the "direct" and "indirect" pathways, which can be distinguished by their projection fields and their opposing effects on behavior. In adult animals, the functional opposition is modulated by the differential actions of D1 and D2 dopamine receptors (D1R, D2R), the expression of which is largely separated between these pathways. To determine whether a similar degree of separation exists earlier in development, we used dual‐label immunohistochemistry to map dorsal‐striatal D1R and D2R expression at the promoter level in postnatal day 0 (PD0) Drd1a‐tdTomato/Drd2‐GFP BAC transgenic mice, and at the receptor level by costaining for native D1R and D2R in wildtype (WT) PD0 animals. To assess for potential molecular interactions between D1R and D2R we also employed a recently developed proximity‐ligation assay (PLA). Limited coexpression and colocalization of the D1R and D2R proteins was found in clusters of neurons endemic to the "patch" compartment as identified by costaining with tyrosine hydroxylase, but not outside these clusters. Moreover, in contrast to our recent findings where we failed to detect a D1R‐D2R PLA signal in the adult striatum, in PD0 striatum we did identify a clear PLA signal for this pair of receptors. This colocalization at close proximity points to a possible role for D1R/D2R‐mediated crosstalk in early striatal ontogeny. J. Comp. Neurol. 523:1175–1189, 2015. © 2015 Wiley Periodicals, Inc.