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Updated: Jun 16, 2026
The 6-hydroxydopamine Rat Model of Parkinson's Disease
Published on: October 27, 2021
Morphologic and functional changes in the unilateral 6-hydroxydopamine lesion rat model for Parkinson's disease
Nadja Van Camp1, Ruth Vreys, Koen Van Laere
1Bio-Imaging Lab, University of Antwerp, Groenenborgerlaan 171, Antwerp, Belgium. nadja.vancamp@ua.ac.be
Object:
In the present study, we aimed to evaluate the impact of neurodegeneration of the nigrostriatal tract in a rodent model of Parkinson's disease on the different MR contrasts (T(2), T(1), CBF and CBV) measured in the striatum.
Material And Methods:
Animals were injected with 6-hydroxydopamine (6OHDA) in the substantia nigra resulting in massive loss of nigrostriatal neurons and hence dopamine depletion in the ipsilateral striatum. Using 7T MRI imaging, we have quantified T(2), T(1), CBF and CBV in the striata of 6OHDA and control rats. To validate the lesion size, behavioral testing, dopamine transporter muSPECT and tyrosine hydroxylase staining were performed.
Results:
No significant differences were demonstrated in the absolute MRI values between 6OHDA animals and controls; however, 6OHDA animals showed significant striatal asymmetry for all MRI parameters in contrast to controls.
Conclusions:
These PD-related asymmetry ratios might be the result of counteracting changes in both intact and affected striatum and allowed us to diagnose PD lesions. As lateralization is known to occur also in PD patients and might be expected in transgenic PD models as well, we propose that MR-derived asymmetry ratios in the striatum might be a useful tool for in vivo phenotyping of animal models of PD.
Insights
This study used MRI to detect asymmetry in rodent Parkinson's disease models. These findings suggest MR-derived asymmetry ratios can help phenotype animal models of Parkinson's disease.
Area of Science:
- Neuroscience
- Radiology
- Animal Models
Background:
- Parkinson's disease (PD) involves neurodegeneration of the nigrostriatal tract.
- Rodent models are crucial for studying PD pathogenesis and testing therapies.
Purpose of the Study:
- Evaluate the impact of nigrostriatal degeneration on MRI contrasts in a rodent PD model.
- Assess the utility of MR-derived asymmetry ratios for PD phenotyping.
Main Methods:
- Induced Parkinson's disease in rats using 6-hydroxydopamine (6OHDA) injection in the substantia nigra.
- Quantified T(2), T(1), cerebral blood flow (CBF), and cerebral blood volume (CBV) using 7T MRI.
- Validated lesion size with behavioral tests, dopamine transporter muSPECT, and tyrosine hydroxylase staining.
Main Results:
- No significant differences in absolute MRI values between 6OHDA and control rats.
- Significant striatal asymmetry observed for all MRI parameters in 6OHDA rats compared to controls.
Conclusions:
- PD-related striatal asymmetry ratios may reflect counteracting changes in affected and intact striata.
- MR-derived asymmetry ratios show promise as a tool for in vivo phenotyping of PD animal models.
- Lateralization observed in this model aligns with known PD patient lateralization.
