Scientists in Germany have created a powerful new artificial intelligence system that can look through an entire mouse body and detect disease-related changes in extraordinary detail.
Using this new technology, researchers discovered widespread inflammation and unexpected nerve damage linked to obesity, including damage to nerves in the face.
The findings may help scientists better understand how obesity affects the whole body and may eventually improve treatment for diseases connected to excess weight.
The research was carried out by scientists from Helmholtz Munich, Ludwig Maximilians University Munich, and several partner institutions. Their study was published in the scientific journal Nature.
Obesity is often discussed as a problem related to body weight, but doctors now know that it affects far more than fat storage. Obesity can change how organs work, disrupt immune activity, damage nerves, and increase the risk of many serious health conditions.
These include type 2 diabetes, heart disease, stroke, cancer, and nerve disorders. Despite these known risks, scientists have struggled to fully understand how obesity changes the body because most research methods only allow them to study one organ or one small tissue sample at a time.
The research team wanted to solve this problem by building a system that could study the entire body all at once. To do this, they created a new AI platform called MouseMapper.
MouseMapper uses advanced deep-learning technology to analyze huge amounts of biological imaging data. The system can automatically identify organs, tissues, nerves, and immune cells throughout an entire mouse body.
According to the researchers, MouseMapper can recognize 31 different organs and tissue types while mapping millions of tiny structures across the body.
To create the detailed body maps, the scientists first used special fluorescent markers that glow under certain microscopes. These glowing markers were attached to nerves and immune cells inside mice.
The team then used tissue-clearing methods to make the mice transparent while still preserving the glowing signals. This unusual process allowed researchers to see deep inside the body without cutting the tissues apart.
Next, the scientists used a technology called light-sheet microscopy to scan the transparent mice and capture highly detailed three-dimensional images. These scans produced massive datasets containing information about tens of millions of cells and structures across the entire body.
MouseMapper then analyzed these huge image collections automatically. The AI system could identify organs, trace nerve pathways, and locate clusters of immune cells throughout the animals.
The researchers used this new technology to study obesity. They fed mice a high-fat diet that caused weight gain and metabolic problems similar to obesity in humans. After scanning the mice, the scientists discovered major changes across many parts of the body.
One of the most surprising findings involved the trigeminal nerve, an important facial nerve that helps control sensation in the face and some motor functions.
In obese mice, this nerve showed major damage, including fewer branches and nerve endings. The findings suggested that obesity may harm facial nerves and reduce normal nerve function.
To test this idea, the researchers carried out behavioral experiments. They found that obese mice were less sensitive to touch and sensory stimulation compared to lean mice. This supported the idea that obesity-related nerve damage was affecting sensation.
The team then studied the trigeminal ganglion, which contains the cell bodies of facial sensory nerves. Using another advanced method called spatial proteomics, they identified molecular changes linked to inflammation and nerve remodeling.
Importantly, the scientists also examined human tissue from people with obesity and found many of the same molecular patterns seen in the mice. This suggests that similar nerve-related damage may also occur in humans living with obesity.
The researchers say this discovery would likely never have been found using traditional research methods focused on only one organ at a time. By studying the body as a connected system, MouseMapper allowed them to uncover hidden links between obesity, inflammation, and nerve damage.
The research team believes MouseMapper could become a valuable tool for studying many diseases that affect multiple organs at the same time. These may include diabetes, cancer, autoimmune diseases, and brain disorders.
The scientists have also made their whole-body imaging datasets publicly available online so researchers around the world can explore the information and study obesity-related changes in different tissues and organs.
Professor Ali Ertürk, who led the project, said the long-term goal is to build highly realistic digital body maps that scientists can study on computers. These “digital twins” could help researchers identify the earliest signs of disease, test possible treatments, and reduce the need for animal experiments in the future.
The study provides important new evidence that obesity affects much more than body weight alone. It appears to reshape the body at the cellular level, including damaging nerves that scientists did not previously realize were vulnerable.
The findings are especially important because nerve damage related to obesity may help explain symptoms such as pain, numbness, and reduced sensation that some people experience.
However, the study was mainly carried out in mice, so more research will still be needed to fully understand how closely these findings apply to humans.
Even so, the discovery highlights the growing power of artificial intelligence in medicine. By combining AI with advanced imaging technology, scientists are now able to study diseases in ways that were impossible only a few years ago.
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Source: Helmholtz Munich.
