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Puri, Sapna; Roy, Nilotpal; Russ, Holger A; Leonhardt, Laura; French, Esra K; Roy, Ritu; Bengtsson, Henrik; Scott, Donald K; Stewart, Andrew F; Hebrok, Matthias
Nature communications, 02/2018, Letnik: 9, Številka: 1Journal Article
Pancreatic β cells are highly specialized to regulate systemic glucose levels by secreting insulin. In adults, increase in β-cell mass is limited due to brakes on cell replication. In contrast, proliferation is robust in neonatal β cells that are functionally immature as defined by a lower set point for glucose-stimulated insulin secretion. Here we show that β-cell proliferation and immaturity are linked by tuning expression of physiologically relevant, non-oncogenic levels of c-Myc. Adult β cells induced to replicate adopt gene expression and metabolic profiles resembling those of immature neonatal β that proliferate readily. We directly demonstrate that priming insulin-producing cells to enter the cell cycle promotes a functionally immature phenotype. We suggest that there exists a balance between mature functionality and the ability to expand, as the phenotypic state of the β cell reverts to a less functional one in response to proliferative cues.
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