Article: article from journal or magazin.
Characterization of β-cell plasticity mechanisms induced in mice by a transient source of exogenous insulin.
American Journal of Physiology. Endocrinology and Metabolism
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
β-Cell plasticity governs the adjustment of β-cell mass and function to ensure normoglycemia. The study of how β-cell mass is controlled and the identification of alternative sources of β-cells are active fields of research. β-Cell plasticity has been implicated in numerous physiological and pathological conditions. We developed a mice model in which we induced major β-cell mass atrophy by implanting insulin pellets (IPI) for 7 or 10 days. The implants were then removed (IPR) to observe the timing and characteristics of β-cell regeneration in parallel to changes in glycemia. Following IPR, the endocrine mass was reduced by 60% at day 7 and by 75% at day 10, and transient hyperglycemia was observed, which resolved within 1 wk. Five days after IPR, enhanced β-cell proliferation and an increased frequency of small islets were observed in 7-day IPI mice. β-Cell mass was fully restored after an additional 2 days. For the 10-day IPI group, β-cell and endocrine mass were no longer significantly different from those of the control group at 2 wk post-IPR. Furthermore, real-time quantitative PCR analysis of endocrine structures isolated by laser capture microdissection indicated sequentially enhanced expression of the pancreatic transcription factors β(2)/NeuroD and Pdx-1 post-IPR. Thus, our data suggest this mouse model of β-cell plasticity not only relies on replication but also involves enhanced cell differentiation plasticity.
Animals, Apoptosis/drug effects, Apoptosis/physiology, Cell Enlargement/drug effects, Cell Proliferation, Congenital Hyperinsulinism, Female, Glucose/metabolism, Glucose Transporter Type 2/metabolism, Hypoglycemia/chemically induced, Hypoglycemic Agents/pharmacology, Insulin/pharmacology, Insulin-Secreting Cells/drug effects, Insulin-Secreting Cells/pathology, Islets of Langerhans/cytology, Islets of Langerhans/drug effects, Laser Capture Microdissection, Mice, Nesidioblastosis, Polymerase Chain Reaction, RNA, Messenger/analysis, Regeneration/drug effects, Regeneration/physiology, Time Factors, Transcription Factors/metabolism
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