Loss of cells in pancreas in the elderly may cause age related diabetes

Researchers from Tokyo Metropolitan University have studied pancreatic islet cell loss in people with no previous pancreatic problems. They identified key trends in the types of cells lost due to islet cell loss in different age groups and sexes, findings published in Digestive and Liver Disease that pancreatic islet cell loss (ICL) in the elderly population was largely due to insulin-producing beta cell loss. This may be the cause of age-related diabetes and help inform new preventative treatments.

A closer look reveals an interesting internal structure, with islets of cells known as islets of Langerhans, after their discoverer, containing the hormone-producing (endocrine) cells. They make a small proportion of all the cells in the pancreas, approximately 1%, making any changes to their morphology or state a potential driver for health problems.

A team led by Professor Shuang-Qin Yi of Tokyo Metropolitan University have been studying the phenomenon of pancreatic islet cell loss (ICL), where voids are observed in these islet regions when observed under the microscope. It was possible for such islets to be surrounded by either healthy cells or lesions, and it remained to be seen what they could teach us about a person’s health.

This led the team to undertake a thorough survey of pancreatic sections taken from the cadavers of people with no pancreatic diseases before death, aged 65 to 104. Islet cell loss in healthy populations is something that is rarely studied. The degree of cell loss in each sample was found by observing stained sections from the pancreas under the microscope and analyzing the images. They focused on trends by age and sex and kept a close eye on the type of cells left in the pancreas, covering the four most abundant cell types, alpha, beta, delta, and PP (pancreatic polypeptide-producing) cells.

Curiously, it was found that women tended to be more likely to show severe ICL. The team’s findings are consistent with data from the International Diabetes Foundation presented in 2021, which showed that women over 70 had a higher incidence of diabetes than men, while the trend reversed for those under 70. While other mechanisms for beta cell loss need to be considered, these findings also seem to suggest that the phenomenon of islet cell loss may be a key driver of senile diabetes. This makes interventions which might specifically slow the decrease in the number of beta cells in the elderly a potentially effective route for preventative treatments.

Reference: Loss of cells in pancreas in the elderly may cause age-related diabetes; Digestive and Liver Disease, DOI: 10.1016/j.dld.2023.11.031