Abstract
Background
Although Parkinson’s disease (PD) is characterized by progressive neurodegeneration of multiple neurotransmitter systems, 6-hydroxydopamine (6-OHDA) as a model substance is mainly used to selectively damage the nigrostriatal dopaminergic neurons and induce parkinsonian-like motor disturbances in rats. We hypothesized that high doses of this neurotoxin affecting other monoaminergic systems may also evoke the depressive-like behavior.
Methods
The impact of 6-OHDA (8, 12, 16 μg/4 μl) administered unilaterally into the medial forebrain bundle on the sucrose solution intake (a measure of anhedonia) and on the tissue levels of noradrenaline (NA), dopamine (DA) and serotonin (5-HT) in the striatum (STR), substantia nigra (SN), prefrontal cortex (PFC) and hippocampus (HIP) was examined in rats pretreated or non-pretreated with desipramine.
Results
The highest dose of 6-OHDA reduced the preference for 3% sucrose solution both in rats without and with desipramine pretreatment. All used doses of 6-OHDA dramatically decreased DA content in the studied brain structures on the ipsilateral side. NA levels were severely decreased in the ipsilateral STR, HIP and PFC of rats non-pretreated with desipramine and to a much lesser extent in those pretreated with desipramine. In the SN, moderate decreases in NA level were found both in rats pretreated and non-pretreated with desipramine. Higher doses of 6-OHDA reduced 5-HT content in the ipsilateral STR, HIP and PFC, but not in the SN, only in rats non-pretreated with desipramine.
Conclusions
Administration of the highest dose of 6-OHDA without desipramine pretreatment evoked neurochemical and behavioral changes resembling the advanced PD with coexisting depression.
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Abbreviations
- APO:
-
apomorphine
- DA:
-
dopamine
- HIP:
-
hippocampus
- 5-HT:
-
serotonin
- LC:
-
locus coeruleus
- MFB:
-
medial forebrain bundle
- NA:
-
noradrenaline
- 6-OHDA:
-
6-hydroxydopamine
- PD:
-
Parkinson’s disease
- PFC:
-
prefrontal cortex
- SN:
-
substantia nigra
- STR:
-
striatum
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Kamińska, K., Lenda, T., Konieczny, J. et al. Depressive-like neurochemical and behavioral markers of Parkinson’s disease after 6-OHDA administered unilaterally to the rat medial forebrain bundle. Pharmacol. Rep 69, 985–994 (2017). https://doi.org/10.1016/j.pharep.2017.05.016
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DOI: https://doi.org/10.1016/j.pharep.2017.05.016