Applying Spatial Metabolomics To Investigate Age- and Drug-Induced Neurochemical Changes

Area of Science:

• Neuroscience
• Metabolomics
• Biochemistry

Background:

• Population aging increases neurodegenerative disease burden.
• Understanding brain senescence mechanisms is crucial.
• Neurochemical alterations accompany aging.

Purpose of the Study:

• To perform spatial metabolomics analysis of age-induced neurochemical changes in the mouse brain.
• To examine age-dependent effects of tacrine, an acetylcholinesterase inhibitor.
• To visualize age-related lipid signaling and neurotransmission alterations.

Main Methods:

• Negative ionization mode mass spectrometry imaging (MSI).
• Fourier-transform ion cyclotron resonance (FT-ICR) for ultrahigh mass resolution.
• Trapped ion mobility spectrometry time-of-flight (TIMS-TOF) for speed and lateral resolution.
• Detection and identification of metabolites including amino acids and sphingolipids.

Main Results:

• Significant, age-dependent alterations in brain lipids, particularly sulfatides and lysophosphatidic acids.
• Sulfatide levels varied with age based on carbon chain length and hydroxylation.
• Lysophosphatidic acids decreased with age in cortical and hippocampal regions.
• Tacrine administration revealed an age-dependent increase in the glutamine/glutamate ratio.

Conclusions:

• Spatial metabolomics effectively visualizes age-related neurochemical pathways.
• Age-induced alterations in specific lipids (sulfatides, lysophosphatidic acids) are identified.
• Tacrine impacts glia-neuron interconnection and potential neurotoxicity markers in aging brains.
• This approach aids in elucidating age-related neurochemical pathways and neurodegenerative mechanisms.