Researchers have developed an innovative tool called MouseMapper that can map the complete changes occurring in all body organs at once, in a major development in understanding the impact of obesity on the body.
The importance of this tool stems from the fact that obesity not only affects metabolism and fat storage, but also alters immune activity, nervous structure, and tissue organization in many body systems, increasing the risk of multiple diseases such as type 2 diabetes, cardiovascular disease, stroke, neuropathy, and cancer.
Despite these widespread effects, researchers have so far lacked tools that would allow them to study these changes in the whole body with high accuracy without dissecting organs separately.
MouseMapper is a set of advanced, model-based deep learning algorithms that are capable of analyzing whole-body bioimaging data.
This tool automatically segments 31 organs and tissue types, with quantitative mapping of nerves and immune cells throughout the body, enabling a comprehensive multi-system understanding without the need to select predefined areas.
To achieve this, the researchers, led by Professor Ali Erturk, director of the Institute of Biological Intelligence at the Helmholtz Center Munich and a professor at Ludwig Maximilian University, labeled the nerves and immune cells in mice with fluorescent markers visible under a microscope. They then used special techniques that made the tissues transparent while preserving the fluorescent signals, allowing them to image deep inside the bodies of healthy mice.
Using a specialized light microscope, the team captured detailed 3D images of the entire mice, producing huge datasets containing tens of millions of cellular structures in various organs and tissues. The MouseMapper tool then automatically analyzed this data.
To test the effectiveness of the tool, the researchers fed mice a high-fat diet that caused them to become obese and metabolically impaired in a manner similar to what occurs in humans
Using MouseMapper, the team revealed widespread changes in immune cell organization and neural structure throughout the body. The most striking finding was a structural change in part of the trigeminal ganglion (or semilunar ganglion), a major facial nerve responsible for sensory and motor functions of the face
Most surprisingly, these same molecular changes were also found in the trigeminal ganglion tissue of obese individuals, confirming that the obesity-related neurological changes observed in mice also occur in humans.
Dr. Doris Kaltenicker, the study's lead researcher and a scientist at the Helmholtz Institute for Diabetes and Cancer in Munich, commented that detecting these structural and molecular changes would not have been possible if each organ had been studied individually, describing this achievement as a
Researchers emphasize that MouseMapper's benefits extend far beyond obesity studies; it could revolutionize our understanding of complex diseases affecting multiple systems simultaneously, such as diabetes, cancer, neurodegenerative diseases, and autoimmune disorders. Unlike previous methods that focused on specific organs, this tool offers a comprehensive platform for whole-body analysis, capable of identifying disease "hotspots" throughout the organism.
Researchers emphasize that MouseMapper's benefits extend far beyond obesity studies; it could revolutionize our understanding of complex diseases affecting multiple systems simultaneously, such as diabetes, cancer, neurodegenerative diseases, and autoimmune disorders. Unlike previous methods that focused on specific organs, this tool offers a comprehensive platform for whole-body analysis, capable of identifying disease "hotspots" throughout the organism.
The team has made the whole-body mouse datasets available online for free, allowing scientists around the world to explore obesity-related changes across different tissues and body systems
The team has made the whole-body mouse datasets available online for free, allowing scientists around the world to explore obesity-related changes across different tissues and body systems
In obese mice, these sensory nerves had far fewer terminals and branches, indicating a loss of normal nerve function, which was confirmed by behavioral experiments showing that these mice responded less to sensory stimuli compared to lean mice.
But it didn't stop there. The researchers examined the trigeminal nerve ganglion, which contains the cell bodies of facial sensory neurons, and identified, using advanced techniques, molecular changes associated with nerve remodeling and inflammation
