Can Adult Pancreatic Beta Cells Regenerate?

The answer is yes, absolutely.

Adult beta cells can make new beta cells by dividing. As long as some functioning beta cells remain, the pancreas appears able to maintain at least some level of self-renewal throughout life.[1,2]

Blood glucose also plays a role. Mild increases in glucose can signal that the body needs more insulin, encouraging beta-cell growth through glucose-sensing and insulin-signaling pathways.[3] Mild cellular stress inside beta cells may also act as a signal to increase beta-cell replication. This is very different from prolonged high blood sugar, which can overwhelm beta cells and contribute to their dysfunction or death.[4]

There may be other sources of new beta cells as well. In experimental studies, pancreatic alpha, delta, and exocrine cells have shown the ability to convert into beta-like cells under certain conditions. Researchers are also exploring whether cells outside the pancreas, including liver and gastrointestinal cells, might be guided toward insulin-producing functions.[2] These approaches are promising, but most are still being studied and are not yet standard treatments for diabetes.

So why does diabetes often worsen over time if beta cells can regenerate? The answer is balance. Beta-cell mass is constantly changing: when new-cell formation exceeds cell loss, the total number of beta cells can increase. When cell death exceeds replacement, beta-cell mass declines.

In type 2 diabetes, genetic factors, insulin resistance, inflammation, and long-term metabolic stress can cause beta cells to die or lose function faster than they can be replaced. That is why protecting existing beta cells—and reducing the stresses that damage them—remains an important goal in diabetes care.[5]

For many years, people believed that adult pancreatic beta cells could not regenerate because the regeneration is happening quietly in the background while beta cells are also being lost.

We now know the picture is more hopeful.

References

1. Dor Y, Brown J, Martinez O, et al. Nature. 2004;429:41–46.

2. Bourgeois S, et al. Trends Endocrinol Metab. 2024;35:951–966.

3. Shirakawa J, Terauchi Y. Endocr J. 2020;67:1–8.

4. Sharma RB, et al. J Clin Invest. 2015;125:3831–3846.

5. Sayyed Kassem L, et al. J Diabetes. 2023;15:817–837.