Diabetes, Vol 41, Issue 7 777-781, Copyright © 1992 by American Diabetes Association

ARTICLES

Heterogeneity in pancreatic beta-cell population

DG Pipeleers
Department of Metabolism and Endocrinology, Vrije Universiteit Brussels, Belgium.

All pancreatic beta-cells are identified by specific morphological characteristics. Similarity in microscopic features is not necessarily associated with identity in functional properties. In vitro studies on isolated rat beta-cells have indicated intercellular differences in the threshold for glucose-induced shifts in metabolic redox state. The cellular heterogeneity in glucose sensitivity results in a dose-dependent recruitment of glucose-exposed beta-cells into biosynthetic and secretory activities. The molecular basis of this diversity is not known. Indirect evidence supports the concept that the in situ pancreatic beta-cell population is also composed of functionally diverse subpopulations. The heterogeneity in glucose responsiveness is expected to create subpopulations of beta-cells with either constant, fluctuating, or occasional glucose-dependent functions; whether any subpopulation is preferentially responsive to other regulatory factors and/or committed to other activities is unknown. Morphological markers may help identify beta-cell subpopulations in situ and quantify their size in conditions known to affect total beta-cell mass or function. The concept of a functionally heterogeneous beta-cell population influences views on the role of pancreatic beta-cells in health and disease.
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