Diffusion Kurtosis Imaging Detects Microstructural Changes in a Methamphetamine-Induced Mouse Model of Parkinson's...

Area of Science:

• Neuroscience
• Radiology
• Toxicology

Background:

• Methamphetamine (METH) abuse is linked to increased Parkinson's disease (PD) risk due to its neurotoxic effects on dopaminergic neurons.
• A METH-induced mouse model replicates PD-like neurodegeneration and motor deficits, providing a platform for studying disease mechanisms.

Purpose of the Study:

• To investigate microstructural brain changes in a METH-induced Parkinson's disease (PD) mouse model using diffusion kurtosis imaging (DKI).
• To assess the utility of DKI as a biomarker for detecting neurodegeneration and potential recovery in the METH PD model.

Main Methods:

• Mice were administered METH or saline and underwent DKI at 5 days and 1 month post-treatment.
• DKI data were analyzed to detect changes in grey and white matter microstructure.
• Tract-based spatial statistics were employed for white matter analysis.

Main Results:

• At 5 days, decreased kurtosis was observed in the substantia nigra, striatum, and sensorimotor cortex, suggesting dopaminergic neuron loss.
• At 1 month, increased kurtosis was found in the striatum, sensorimotor cortex, and hippocampus, potentially indicating recovery processes.
• White matter analysis at 1 month revealed increased kurtosis in specific tracts, including the ventral nucleus of the lateral lemniscus and lateral thalamic nuclei.

Conclusions:

• Diffusion kurtosis imaging effectively detects microstructural alterations in both grey and white matter within the METH PD model.
• Kurtosis appears to be a promising biomarker for monitoring brain changes in Parkinson's disease and other neurodegenerative conditions.