Correlation between the availability of dopamine transporter and olfactory function in healthy subjects

Area of Science:

• Neuroscience
• Neurology
• Radiology

Background:

• Olfactory dysfunction often precedes Parkinson's disease symptoms.
• Dopamine transporter (DAT) availability is a marker for dopaminergic neuron integrity.

Purpose of the Study:

• To investigate the relationship between olfactory function and striatal DAT availability in healthy subjects.
• To determine if this association is influenced by age.

Main Methods:

• Utilized data from the Parkinson's Progression Markers Initiative (PPMI) database.
• Assessed olfactory function using the University of Pennsylvania Smell Identification Test (UPSIT).
• Quantified striatal DAT availability via ¹²³I-FP-CIT SPECT imaging.

Main Results:

• Reduced specific binding ratios (SBRs) in the caudate nucleus, putamen, and striatum were observed with increasing age.
• SBRs in these striatal regions positively correlated with UPSIT scores.
• Striatal SBRs significantly influenced UPSIT scores, even after controlling for age.

Conclusions:

• Olfactory function is independently associated with striatal DAT availability in healthy individuals.
• This finding highlights a potential link between olfactory decline and dopaminergic system changes.
• The study provides insights into early markers relevant to Parkinson's disease research.