Researchers at EPFL created a 3D map of mouse brain lipids, identifying 539 distinct chemical zones. The atlas reveals complex patterns in white matter and changes during pregnancy.
Scientists at the École Polytechnique Fédérale de Lausanne (EPFL) have created the first detailed three-dimensional map of lipids in the mouse brain. The study, published in the journal Nature, identifies 539 distinct chemical zones, which the researchers named "lipizones." These findings reveal a complex organization of fatty molecules that traditional brain maps have missed.
Lipids are essential for brain structure and communication, forming cell membranes and myelin insulation. However, conventional imaging techniques have struggled to distinguish individual lipid molecules, leaving a gap in understanding their distribution. To address this, a team led by Giovanni D'Angelo, Luca Fusar Bassini, and Gioele La Manno used mass spectrometry imaging to analyze thin sections of brain tissue.
The researchers examined 172 different lipids in 109 brain slices collected from 11 mice. This process generated approximately 7 million measurements, which were combined into a comprehensive 3D reconstruction using machine learning tools developed for the project. The resulting atlas shows that lipids are arranged in highly organized patterns, with each zone having a characteristic chemical signature.
"So scientists have had only a blurry picture of how lipids differ from one part of the brain to another," says Giovanni D'Angelo, professor at The Kristian Gerhard Jebsen Foundation Chair in Nutrition and Metabolism at EPFL. "That gap matters, because changes in brain lipids are increasingly linked to conditions from depression to Alzheimer's disease."
The atlas revealed that white matter, the tissue containing nerve fibers that connect different brain regions, is not chemically uniform as previously thought. Instead, it contains numerous distinct lipid zones. This suggests that the cells responsible for producing myelin are more chemically diverse than their genetic makeup alone would indicate.
"This shows that the cells which make myelin are far more varied in their chemistry than their genes alone would suggest," says Luca Fusar Bassini.
The study also identified unexpected chemical boundaries in the choroid plexus, the structure responsible for producing cerebrospinal fluid, and in the tissues lining the brain's internal cavities. Some of the identified regions correspond to established anatomical structures, while others reveal connections between distant nerve cell bodies that were difficult to detect using maps based on gene activity.
"In effect, lipids work like postal codes, giving distant but related parts of the brain the same chemical address," says D'Angelo.
Beyond mapping structure, the atlas provided insights into how brain chemistry changes during pregnancy. Researchers found substantial shifts in lipid composition across numerous brain regions in pregnant mice. These changes were more pronounced than the typical lipid differences observed between male and female mice.
The cortex, which forms the brain's outer layer, showed particularly extensive changes. Additionally, levels of galactosyl ceramide, an important component of myelin, increased sharply throughout much of the brain's white matter.
"Together, these shifts suggest the brain retunes its own wiring to meet the demands of pregnancy," says Gioele La Manno. "The Atlas reveals that the brain constantly adjusts its lipids to meet the body's changing needs."
The Lipid Brain Atlas is freely available online and serves as a reference for healthy mouse brain tissue. While the specific map cannot be directly applied to humans, the method used to create it could help researchers uncover comparable patterns in the human brain. By combining lipid information with existing genetic and cellular maps, scientists can gain a more complete understanding of brain organization and how its chemistry changes over time. This resource may aid in investigating how disruptions in lipid distribution contribute to brain development, aging, and disorders such as Alzheimer's disease and depression.
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This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.
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