The development of the pancreas during early childhood may significantly influence the risk of diabetes later in life. American researchers have, for the first time, meticulously mapped the maturation of Langerhans islets in the developing pancreas of children. These findings could also provide new insights into the emergence of Type 1 diabetes.
From 2002 to 2018, the annual incidence of both Type 1 and Type 2 diabetes among individuals under 20 years of age has increased significantly. Data from the American long-term study “SEARCH for Diabetes in Youth” indicates that diabetic ketoacidosis remains one of the leading causes of death associated with the initial manifestation of diabetes in childhood.
Against this backdrop, a research team from Vanderbilt University Medical Center in Nashville, USA, sought new approaches to better understand the onset of this condition, with the ultimate goal of improving care for young patients. Their comprehensive research findings were recently published in the journal “Nature Communications.”
Detailed Map of Pancreatic Development in Childhood
For the study, scientists analyzed the development of Langerhans islets in the pancreases of 123 pediatric organ donors, who did not have diabetes at the time of death. The researchers aimed to gain fundamental insights into the development and function of the childhood pancreas, particularly focusing on the causes of the organ’s vulnerability to subsequent dysfunction during the maturation phase from infancy to childhood.
Using quantitative analyses and high-resolution imaging techniques, the researchers evaluated over 30 biological markers. Techniques such as confocal microscopy and multiplex immunofluorescence with whole-slide imaging (Co-Detection by indEXing [CODEX]) were employed. Based on this data, the team created a detailed map of human pancreatic development in childhood, linking structural changes to the functionality of islet cells.
Dynamic Development from Birth
The study provides a range of new insights into pancreatic development, particularly regarding islet cells. Furthermore, the findings may hint at the biological mechanisms underlying diabetes development. “The pancreas is an extraordinarily dynamic organ during the first decade of life – precisely during this phase, the earliest cellular malfunctions often occur,” explains Dr. Mark Atkinson, one of the study leaders from the University of Florida.
Key insights from the study include:
- Significant Variations at Birth: The size and weight of the pancreas, as well as the structure and cellular composition of the Langerhans islets, differ markedly immediately after birth. Pancreas weight varied nearly fourfold among infants, and a smaller pancreas volume is considered a potential risk factor for Type 1 diabetes.
- Reduced Growth of Beta Cells: After birth, the division rate of endocrine cells rapidly declines. Insulin-producing beta cells multiply significantly slower than previously thought. According to the researchers, this supports the notion that the later beta-cell mass is predominantly established during fetal development and in the early years of life.
- Evidence of Postnatal Islet Cell Formation: Identification of potential multipotent precursor cells suggests that new endocrine cells may form even after birth. Moreover, immune cells, particularly macrophages, appear to support the postnatal development of islet cells.
- Delayed Innervation: While blood vessels reach the islet cells at birth, neuronal innervation develops later. Compared to animal models, human islet cells seem to be more regulated by local chemical signaling pathways.
- Asynchronous Cell Maturation: Alpha and beta cells develop at different times, which may be significant for regulating glucose metabolism in early childhood.
Comprehensive Image Database for Further Research
Until now, research on the developing human pancreas has been limited due to restricted access to relevant tissue and technical constraints. To promote international research collaboration, the authors have made the complete image dataset publicly available through the online platform Pancreatlas in the Neonatal Development & Early Life Pancreas collection (HANDEL-P).
The authors believe that this study lays an essential foundation for future investigations into islet cell development and the contextualization of genetic risk factors for diabetes. Ultimately, these insights could aid in the earlier diagnosis of diabetes, the development of preventive strategies, and the enhancement of personalized therapies.
The organ donations studied originated from healthy infants and children without diabetes, aged between two months and ten years, who had died from accidents or other causes. Study leader Dr. Marcela Brissova emphasizes, “This study is dedicated to the children whose organ donations made this research possible, as well as their families. Their decision to consent to organ donation, despite personal loss, has made an invaluable contribution to science.”
