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Cell Metab DOI:10.1016/j.cmet.2020.04.004

A Nutrient-Sensing Transition at Birth Triggers Glucose-Responsive Insulin Secretion.

Publication TypeJournal Article
Year of Publication2020
AuthorsHelman, A, Cangelosi, AL, Davis, JC, Pham, Q, Rothman, A, Faust, AL, Straubhaar, JR, Sabatini, DM, Melton, DA
JournalCell Metab
Volume31
Issue5
Pages1004-1016.e5
Date Published2020 May 05
ISSN1932-7420
Abstract

A drastic transition at birth, from constant maternal nutrient supply in utero to intermittent postnatal feeding, requires changes in the metabolic system of the neonate. Despite their central role in metabolic homeostasis, little is known about how pancreatic β cells adjust to the new nutritional challenge. Here, we find that after birth β cell function shifts from amino acid- to glucose-stimulated insulin secretion in correlation with the change in the nutritional environment. This adaptation is mediated by a transition in nutrient sensitivity of the mTORC1 pathway, which leads to intermittent mTORC1 activity. Disrupting nutrient sensitivity of mTORC1 in mature β cells reverts insulin secretion to a functionally immature state. Finally, manipulating nutrient sensitivity of mTORC1 in stem cell-derived β cells in vitro strongly enhances their glucose-responsive insulin secretion. These results reveal a mechanism by which nutrients regulate β cell function, thereby enabling a metabolic adaptation for the newborn.

DOI10.1016/j.cmet.2020.04.004
Pubmed

http://www.ncbi.nlm.nih.gov/pubmed/32375022?dopt=Abstract

Alternate JournalCell Metab.
PubMed ID32375022