| Title: |
Lack or Inhibition of Dopaminergic Stimulation Induces a Development Increase of Striatal Tyrosine Hydroxylase-Positive Interneurons |
| Authors: |
Busceti, C. L.; Bucci, D.; Molinaro, G.; Di Pietro, P.; Zangrandi, L.; Gradini, R.; Moratalla, Rosario; Battaglia, G.; Bruno, V.; Nicoletti, Ferdinando; Fornai, F. |
| Publisher Information: |
Public Library of Science |
| Publication Year: |
2012 |
| Collection: |
Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| Description: |
We examined the role of endogenous dopamine (DA) in regulating the number of intrinsic tyrosine hydroxylase-positive (TH +) striatal neurons using mice at postnatal day (PND) 4 to 8, a period that corresponds to the developmental peak in the number of these neurons. We adopted the strategy of depleting endogenous DA by a 2-day treatment with α-methyl-p-tyrosine (αMpT, 150 mg/kg, i.p.). This treatment markedly increased the number of striatal TH + neurons, assessed by stereological counting, and the increase was highly correlated to the extent of DA loss. Interestingly, TH + neurons were found closer to the clusters of DA fibers after DA depletion, indicating that the concentration gradient of extracellular DA critically regulates the distribution of striatal TH + neurons. A single i.p. injection of the D1 receptor antagonist, SCH23390 (0.1 mg/kg), the D2/D3 receptor antagonist, raclopride (0.1 mg/kg), or the D4 receptor antagonist, L-745,870 (5 mg/kg) in mice at PND4 also increased the number of TH + neurons after 4 days. Treatment with the D1-like receptor agonist SKF38393 (10 mg/kg) or with the D2-like receptor agonist, quinpirole (1 mg/kg) did not change the number of TH + neurons. At least the effects of SCH23390 were prevented by a combined treatment with SKF38393. Immunohistochemical analysis indicated that striatal TH + neurons expressed D2 and D4 receptors, but not D1 receptors. Moreover, treatment with the α4β2 receptor antagonist dihydro-β-erythroidine (DHβE) (3.2 mg/kg) also increased the number of TH + neurons. The evidence that DHβE mimicked the action of SCH23390 in increasing the number of TH + neurons supports the hypothesis that activation of D1 receptors controls the number of striatal TH + neurons by enhancing the release of acetylcholine. These data demonstrate for the first time that endogenous DA negatively regulates the number of striatal TH + neurons by direct and indirect mechanisms mediated by multiple DA receptor subtypes. © 2012 Busceti et al. ; Peer Reviewed |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
Publisher's version; PLoS ONE 7 (2012); http://hdl.handle.net/10261/72700 |
| DOI: |
10.1371/journal.pone.0044025 |
| Availability: |
http://hdl.handle.net/10261/72700; https://doi.org/10.1371/journal.pone.0044025 |
| Rights: |
open |
| Accession Number: |
edsbas.BC44576F |
| Database: |
BASE |