Heterogeneity of the Human Pancreatic Islet

Pancreatic beta-cells play a pivotal role in maintaining normoglycemia. Recent studies have revealed that the beta-cell is not a homogeneous cell population, but heterogeneous in a number of properties such as electrical activity, gene expression and cell surface markers. Identification of specific beta-cell subpopulations altered in diabetic conditions would open a new avenue to develop targeted therapeutic interventions. When intense studies of the beta-cell heterogeneity are anticipated in the next decade, heterogeneity of the islet may not be well-recognized. Many studies in the past have been undertaken with a small sample of islets, which might overlook important individual variance. In this study, by systematic analyses of the human islet in 2D and 3D, we demonstrate islet heterogeneity in size, number, architecture, cellular composition and capillary density. There is no stereotypic human islet, and thus a sufficient number of islets should be examined to assure study reproducibility.