Scientists are learning that the human body is much more connected than we once thought.
A new study from the Buck Institute for Research on Aging, working together with researchers from the University of California San Francisco, has uncovered a surprising connection between brain health and bone strength.
The research was published in the journal Advanced Science and focuses on a gene called APOE4, which is already known as the strongest genetic risk factor for Alzheimer’s disease.
Alzheimer’s disease is a brain condition that slowly damages memory and thinking. It mostly affects older adults, and women are more likely to develop it than men.
For many years, doctors have also noticed that people with Alzheimer’s often have weaker bones and are more likely to break them.
In fact, bone loss in women has been seen as one of the earliest warning signs before Alzheimer’s appears. However, no one fully understood why this happens.
In this study, scientists explored this question in detail using mice that carry human versions of the APOE gene. There are different types of this gene, including APOE2, APOE3, and APOE4. APOE4 is the version that increases the risk of Alzheimer’s disease. The researchers studied how this gene affects both the brain and bones at the same time.
What they found was surprising. Female mice with the APOE4 gene showed clear problems in bone quality, even though their bones looked normal in standard scans. This means that common medical tests may not be able to detect the damage early. The changes were happening deep inside the bone at a very small level.
The study showed that certain cells in the bone, called osteocytes, were not working properly. These cells are responsible for maintaining the internal structure of bones.
They keep tiny channels inside the bone healthy, which helps bones stay strong and flexible. When these cells do not work well, the bone becomes weaker, even if its shape and density look normal.
The researchers found that APOE4 interferes with this maintenance system. It reduces the ability of osteocytes to repair and maintain bone tissue.
This leads to hidden damage that builds up over time. Interestingly, this effect was much stronger in females, which matches what doctors see in real patients, where women have a higher risk of both bone loss and Alzheimer’s disease.
Another important finding was that bones contain many proteins that are also linked to brain diseases. This suggests that bones may reflect what is happening in the brain earlier than we thought. In fact, the changes in bone proteins were even stronger than the changes seen in the brain in some cases.
These findings open up new possibilities for early detection. If bone changes can be detected before brain symptoms appear, doctors might be able to identify people at risk earlier. It also suggests that treatments aimed at protecting bone cells could help reduce overall health risks.
However, it is important to note that this research was done in mice, not humans. While the results are very promising, more studies are needed to confirm if the same process happens in people. Scientists also need to find safe and effective ways to target these bone cells.
Overall, this study highlights the importance of looking at the body as a whole system rather than separate parts. It shows that a gene linked to brain disease can also affect bones in a hidden way, especially in women. While more research is needed, this discovery may lead to new ways to detect and manage Alzheimer’s disease earlier in life.
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