Many people living with inflammatory bowel disease experience a frustrating problem. Even after their condition is treated and inflammation improves, they continue to have symptoms like stomach pain, bloating, and irregular bowel movements.
These symptoms often resemble irritable bowel syndrome and can greatly affect quality of life. Until recently, doctors did not have a clear explanation for why this happens.
A new study led by Dr. Milena Bogunovic helps explain this mystery. The research, published in the Journal of Experimental Medicine, shows that inflammation can cause lasting changes in the nerves of the gut, which continue to affect how the digestive system works long after the inflammation has ended.
The digestive system is controlled by a network of nerves called the enteric nervous system. This system runs along the entire gut and works almost like a second brain. It controls how food moves, how nutrients are absorbed, and how muscles contract in a coordinated way.
Under normal conditions, this system is well organized. Nerve cells are arranged in structured patterns, allowing signals to move smoothly and efficiently. This helps the gut function properly.
The study found that inflammation disrupts this organization. When the gut becomes inflamed, nerve cells begin to communicate with immune cells. These immune cells, called monocytes, enter the nervous system and transform into macrophages. While macrophages are usually helpful for healing, having too many of them can lead to damage.
As more macrophages gather, they begin to change the structure of the nerve network. Some areas lose nerve cells, while others develop abnormal clusters. The connections between these cells become irregular and disordered.
This change in structure leads to problems in how the gut muscles contract. Instead of moving in a smooth and coordinated way, the muscles begin to contract unevenly. This causes many of the symptoms seen in IBS, even when inflammation is no longer active.
Another important part of the study is the role of oxygen levels. During inflammation, the gut environment becomes low in oxygen. This stresses the nerve cells. However, the researchers found that the cells can activate a survival pathway that helps them adapt to this stress.
When this protective pathway is turned on early, it helps preserve the normal structure of the nerve network. It also reduces the entry of immune cells, preventing excessive damage. This suggests that treatments aimed at supporting this response could help prevent long-term symptoms.
The study also challenges the traditional belief that nerve cells do not regenerate. The researchers found evidence that new nerve cells can form after inflammation. However, these new cells may not organize correctly, which can contribute to ongoing dysfunction.
This research provides a new way of thinking about digestive diseases. It shows that the effects of inflammation do not end when symptoms improve. Instead, inflammation can leave behind lasting changes that continue to affect the body.
In analysing the findings, it becomes clear that treating inflammation alone may not be enough for many patients. Future treatments may need to focus on protecting and repairing the nervous system in the gut. The study also highlights the importance of early treatment, as preventing damage may be easier than reversing it later.
Although more research is needed to confirm these findings in humans, this study offers an important step forward. It provides a clearer understanding of why symptoms persist and opens the door to new approaches that could improve long-term outcomes for patients.
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Source: Icahn School of Medicine at Mount Sinai.
