Longitudinal Monitoring of Glutathione Stability in Different Microenvironments

Area of Science:

• Neuroscience
• Biochemistry
• Medical Diagnostics

Background:

• Glutathione (GSH) is a key antioxidant protecting cells from oxidative stress.
• Significant GSH depletion in the hippocampus is an early indicator of mild cognitive impairment (MCI) and Alzheimer's disease (AD).
• Validating GSH stability in vivo is crucial for its use as a reliable AD biomarker.

Purpose of the Study:

• To assess the longitudinal stability of glutathione (GSH) in various brain regions of healthy individuals.
• To compare GSH stability in the brain microenvironment with its stability in an in vitro phosphate buffer solution (PBS).
• To evaluate the potential of GSH as a stable biomarker for Alzheimer's disease.

Main Methods:

• Longitudinal monitoring of GSH levels in healthy subjects' brain regions (frontal cortex, parietal cortex, occipital cortex, cerebellum) using Magnetic Resonance Spectroscopy (MRS) with the MEGA-PRESS sequence on a 3T scanner.
• In vitro MRS assessments of GSH stability in a phosphate buffer solution (PBS) under identical study conditions.
• Analysis of GSH stability over time in both in vivo and in vitro settings.

Main Results:

• Glutathione (GSH) demonstrated stability over time within the brain microenvironment of healthy individuals.
• GSH exhibited susceptibility to oxidation and degradation when stored in a phosphate buffer solution (PBS) over time.
• MRS successfully monitored GSH levels longitudinally in different brain regions.

Conclusions:

• The stability of GSH in the healthy brain supports its potential as a reliable biomarker for Alzheimer's disease.
• GSH's instability in a phosphate buffer highlights the importance of considering the microenvironment when assessing biomarker candidates.
• Further research is warranted to explore GSH's diagnostic utility in neurodegenerative diseases.