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Spared caudal brainstem SERT binding in early Parkinson's disease
Roger L Albin1, Robert A Koeppe, Nicolaas I Bohnen
1Geriatrics Research, Education, and Clinical Center, Ann Arbor VA, Ann Arbor, MI, USA. ralbin@umich.edu
Summary
Parkinson's disease (PD) shows reduced serotonin transporter (SERT) binding, particularly in the forebrain. This PET imaging study found no asymmetry, with the medulla being relatively spared in early PD patients.
Area of Science:
- Neuroscience
- Neurology
- Radiology
Background:
- Postmortem studies suggest a loss of serotoninergic neurons in Parkinson's disease (PD).
- The serotonin transporter (SERT) is a key marker for serotoninergic neurons.
- Understanding SERT changes in early PD is crucial for diagnosis and treatment.
Purpose of the Study:
- To examine the distribution and changes of SERT using positron emission tomography (PET) and a specific radioligand in early PD subjects.
- To quantify SERT binding in various brain regions in PD patients compared to healthy controls.
Main Methods:
- Utilized 3-amino-4-(2-dimethylaminomethyl-phenylsulfaryl)-benzonitril (DASB), a SERT radioligand, with PET imaging.
- Studied five early PD subjects (Hoehn and Yahr stages 1-2.5) and eight normal controls.
- Analyzed SERT binding across brain regions, including forebrain and brainstem.
Main Results:
- Reduced SERT binding was observed in PD subjects compared to controls.
- The reduction in DASB binding was more pronounced in forebrain regions than in brainstem regions.
- No significant asymmetry of diminished SERT binding was detected between hemispheres.
- DASB binding in the medulla was relatively preserved, contrasting with some pathological descriptions.
Conclusions:
- Early Parkinson's disease is associated with widespread reductions in serotonin transporter binding, predominantly in the forebrain.
- PET imaging with DASB can detect these changes and may help in understanding PD neurodegeneration.
- The relative sparing of medullary SERT binding warrants further investigation regarding PD pathology progression.
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