To map how membrane lipids vary across adult mouse brain regions, cell types, neural connections, and physiological states.
Approach:
Imaging: Researchers used MALDI mass spectrometry imaging on 109 brain sections from 11 mice, collecting lipid data at 7.2 million locations.
Analysis: After quality filtering and annotation, analyses focused on 172 high-confidence, nonredundant lipids. Data were aligned with the Allen Mouse Brain Atlas.
Key Findings:
Computational analysis identified 539 lipid-defined regions, or “lipizones,” distinguishing structures including grey and white matter, cortical layers, and ventricles.
Oligodendrocyte- and myelin-associated lipid patterns varied across white matter; some lipid patterns linked distant but connected brain regions.
Pregnancy was associated with broader lipid changes than differences between male and nonpregnant female mice, including white-matter sphingolipid changes and localized remodeling in cortical layer 4.
Interpretation:
The study authors describe the atlas as a reference for interpreting lipid measurements in anatomical context and for investigating lipid biomarkers. Physiological state may also affect lipid patterns.
Limitations:
The study does not establish diagnostic biomarkers.
Findings from mice require validation in human tissue and clinical samples.
Conclusion:
The spatial lipid atlas may support future comparisons with mouse models of neurological disease and help distinguish disease-related changes from normal regional variation.
In a rare anti-vimentin encephalitis case, molecular imaging detected abnormalities that declined alongside neurologic improvement following immunotherapy.
