For more than a century, scientists have been trying to turn insulin into a pill. Since insulin was first discovered in the early 1920s, it has saved millions of lives, especially for people with diabetes who cannot produce enough insulin on their own.
However, even after all these years, insulin still needs to be injected into the body using a needle. This has remained one of the biggest challenges in diabetes care.
The reason is not simple. When insulin is swallowed, it travels through the digestive system, where it is quickly broken down by enzymes. These enzymes are designed to digest proteins, and insulin is a protein.
By the time it reaches the intestine, very little of it is left. Even worse, the intestine is not good at absorbing insulin into the bloodstream. Because of these barriers, oral insulin has long been considered a “dream” rather than a reality.
A new study from Kumamoto University in Japan may finally bring this dream closer to becoming real. The research was led by Associate Professor Shingo Ito and was published in the journal Molecular Pharmaceutics. The team developed a new method that helps insulin survive the digestive system and enter the bloodstream through the intestine.
Their solution is based on a special molecule called a cyclic peptide, known as the DNP peptide. This peptide has a unique shape that allows it to pass through the wall of the small intestine more easily than normal proteins. By using this peptide as a carrier, the researchers found a way to transport insulin into the body without using injections.
The team tested two different methods to deliver insulin using this system. In the first method, they mixed insulin with a modified peptide. This mixture helped insulin stay stable and allowed it to pass through the intestine.
When tested in mice with diabetes, the results were impressive. Blood sugar levels dropped quickly to normal levels, and the effect lasted with just one dose per day over several days.
In the second method, the researchers directly attached the peptide to the insulin molecule using a chemical process. This created a new compound that could move through the intestine more effectively. This method worked just as well as the first one, confirming that the peptide plays an active role in helping insulin enter the bloodstream.
One of the most important findings of the study is that this method does not require extremely high doses. In the past, attempts to create oral insulin needed very large amounts of insulin to have any effect, which made it impractical.
However, this new approach achieved about 33 to 41 percent efficiency compared to injected insulin. This is a major improvement and suggests that oral insulin could become realistic for everyday use.
This breakthrough could have a big impact on people living with diabetes. Many patients need to inject insulin every day, which can be painful and stressful. Over time, this routine can affect their quality of life. A pill form of insulin would be much easier to take and could improve treatment adherence.
However, it is important to understand that this research is still in the early stages. The experiments were done in animal models, and more studies are needed to confirm that the method works safely in humans. The researchers are now planning to test the system in larger animals and models that better represent the human body.
Overall, this study represents an exciting step forward. It shows that with new technology and creative thinking, long-standing problems in medicine can be solved.
From a scientific point of view, the study is strong because it tested two different methods and showed consistent results. It also addressed one of the biggest challenges in oral drug delivery, which is low absorption.
However, the findings are still limited to early testing, and human trials will be critical before this approach can be used in real patients. If future studies confirm these results, this technology could change how diabetes is treated around the world.
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Source: Kumamoto University.
