For many years, scientists have noticed an interesting pattern. People who live at high altitudes, where the air contains less oxygen, tend to have lower rates of diabetes compared to those living closer to sea level.
This observation has puzzled researchers because it was not clear why lower oxygen levels would be linked to better blood sugar control.
A new study published in the journal Cell Metabolism by scientists at Gladstone Institutes now offers an explanation.
The research shows that red blood cells, which are best known for carrying oxygen, also play an important role in controlling blood sugar under low-oxygen conditions.
Red blood cells are usually thought of as simple cells that move oxygen from the lungs to the rest of the body.
However, this study shows that they are more active than previously believed.
Under low-oxygen conditions, also known as hypoxia, these cells change how they work. Instead of just carrying oxygen, they begin to take in large amounts of glucose, which is a type of sugar found in the blood.
The researchers discovered this by studying mice exposed to low oxygen levels. They noticed that after the mice ate, the sugar in their blood dropped very quickly.
This suggested that the glucose was being used or stored somewhere in the body. At first, the scientists looked at common organs such as the brain, liver, and muscles, but these could not explain the change.
Eventually, they found that red blood cells were acting like “sponges,” soaking up glucose from the bloodstream. Not only were there more red blood cells under low oxygen conditions, but each cell also absorbed more sugar than usual. This finding was surprising because red blood cells were not previously known to play such a major role in glucose use.
Further investigation showed that the glucose taken up by these cells helps produce molecules that improve oxygen delivery to tissues. This makes sense because when oxygen is limited, the body needs to use it more efficiently. As a result, the process both improves oxygen use and lowers blood sugar levels at the same time.
The researchers also tested a drug called HypoxyStat, which mimics the effects of low oxygen. This drug changes how red blood cells handle oxygen, causing similar effects to those seen at high altitude. In mice with diabetes, the drug was able to lower blood sugar levels very effectively, even more than some existing treatments.
These findings suggest a completely new way of thinking about diabetes. Instead of focusing only on organs like the pancreas or muscles, scientists may be able to target red blood cells to help control blood sugar.
However, there are important limitations. The study was conducted in mice, and human biology may respond differently. While the results are promising, clinical trials in humans are needed before this approach can be used in real treatments.
Another point to consider is that long-term exposure to low oxygen can have negative effects in some situations. Therefore, using drugs like HypoxyStat may be a safer way to achieve similar benefits without the risks of living in low-oxygen environments.
In conclusion, this study provides new insight into how the body adapts to low oxygen and reveals an unexpected role for red blood cells in controlling blood sugar. While more research is needed, the findings open the door to new treatment strategies for diabetes and other metabolic conditions.
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