Human endocrine pancreas maturation mapped, revealing temporal differences in insulin and glucagon secretion.

The precise timeline and events of human endocrine cell differentiation and islet morphogenesis remain incompletely defined, despite their critical roles in determining islet cell mass and function. A deeper understanding of early human islet development is crucial for advancing diabetes research, particularly in the context of beta-cell dysfunction in Type 2 Diabetes Mellitus (T2DM). Current standard-of-care for diabetes often targets symptoms, but a lack of comprehensive knowledge on healthy islet maturation hinders the development of regenerative therapies and accurate disease modeling, especially for human pluripotent stem cell (hPSC)-derived pancreatic cells.

Researchers collected 123 pediatric pancreata from birth through the first 10 years of life to map morphological and spatiotemporal changes. They employed quantitative analyses and complementary tissue imaging approaches, including confocal microscopy and whole-slide multiplex imaging, to develop an integrated model of endocrine cell formation and islet architecture. This included assessing endocrine cell type heterogeneity, abundance, proliferation, and islet vascularization and innervation. Additionally, insulin and glucagon secretory profiles were evaluated in isolated islet preparations from pediatric donors aged 2 months to 10 years.

The comprehensive mapping revealed an integrated model for endocrine cell formation and islet architecture across early postnatal periods. Key findings included detailed insights into endocrine cell type heterogeneity and abundance, endocrine cell proliferation, and the progression of islet vascularization and innervation. Most notably, the study identified a significant temporal difference in the maturation of insulin secretion compared to glucagon secretion. While specific quantitative data for this difference were not detailed in the abstract, the finding highlights distinct developmental trajectories for these critical hormones. The research provides a foundational framework for understanding the complex processes governing human islet development. This detailed characterization of postnatal pancreatic islet development offers a crucial benchmark for future studies.

The study found a temporal difference in the maturation of insulin secretion compared to glucagon secretion in pediatric donors aged 2 months to 10 years.