Obesity is known to increase the risk of many serious diseases, including diabetes, heart disease, and certain types of cancer. One of the most dangerous cancers linked to obesity is pancreatic cancer, which is often diagnosed late and is very difficult to treat.
For many years, scientists believed that high levels of insulin caused by obesity were a key reason why this cancer develops. However, a new study has challenged this long-held idea and offers a different explanation.
The study, published in Nature Communications and led by researchers at Yale School of Medicine, found that another hormone, called cholecystokinin, may play a more important role than insulin in driving obesity-related pancreatic cancer.
When a person is obese, their body needs more insulin to control blood sugar levels. This puts extra pressure on special cells in the pancreas called beta cells, which are responsible for producing insulin.
Scientists previously thought that this overwork of beta cells and increased insulin production could lead to cancer development. However, this new research suggests that something else is happening inside these cells.
The researchers discovered that in obese mice, some beta cells begin to produce cholecystokinin instead of insulin. Cholecystokinin is a hormone normally involved in digestion. It helps the body break down food and signals when we feel full. But when produced in the pancreas in large amounts, it appears to have harmful effects.
The team found that higher levels of this hormone were strongly linked to faster and more aggressive growth of pancreatic tumors, especially a common and severe type called pancreatic ductal adenocarcinoma. This suggests that cholecystokinin may be a key driver of cancer in people with obesity.
To understand why beta cells change in this way, the researchers used advanced computer tools and machine learning methods. These tools allowed them to track how individual cells change over time.
They found that beta cells do not all behave the same way. Instead, they exist along a range of states and can shift from one state to another depending on conditions such as obesity.
The study showed that under the stress caused by obesity, some healthy insulin-producing beta cells gradually change and begin producing cholecystokinin. This shift appears to be linked to stress signals inside the cells. In this situation, producing cholecystokinin may be a kind of response to stress, but it ends up creating new risks.
Another important finding was that changes in the beta cells also affected other parts of the pancreas. The pancreas has two main sections. One part produces hormones like insulin, while the other part helps with digestion. These two parts were once thought to work independently, but this study shows they are closely connected.
As beta cells change and start producing cholecystokinin, nearby cells involved in digestion also begin to change. These changes make them more likely to develop into cancer cells. This discovery highlights an important interaction between different parts of the pancreas that scientists had not fully understood before.
To confirm the role of cholecystokinin, the researchers carried out additional experiments. They increased the levels of this hormone in healthy mice and found that it was enough to trigger cancer development. On the other hand, when they blocked the production of cholecystokinin in obese mice, tumor growth was greatly reduced.
These results show that cholecystokinin is both necessary and sufficient to drive obesity-related pancreatic cancer in this model. This is a strong finding that could change how scientists think about the disease.
The study also suggests a possible new way to detect pancreatic cancer earlier. Since cholecystokinin can enter the bloodstream, it may be possible to measure its levels with a simple blood test. High levels of this hormone could act as a warning sign for increased cancer risk.
While these findings are very promising, it is important to remember that the study was conducted in mice. More research is needed to confirm whether the same process occurs in humans. However, the study provides a strong starting point for future research.
Overall, this research offers a new way to understand how obesity can lead to pancreatic cancer. It shifts the focus away from insulin and highlights the role of a different hormone. It also shows how stress inside cells can lead to harmful changes and how different parts of the body can interact in unexpected ways.
If these findings are confirmed in humans, they could lead to new strategies for prevention, early detection, and treatment of one of the deadliest cancers. Targeting the signals between different types of cells in the pancreas may become an important approach in the future.
If you care about cancer, please read studies that a low-carb diet could increase overall cancer risk, and vitamin D supplements could strongly reduce cancer death.
For more information about health, please see recent studies about how drinking milk affects the risks of heart disease and cancer and results showing higher intake of dairy foods linked to higher prostate cancer risk.
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