Maladaptive positive feedback production of ChREBPβ underlies glucotoxic β-cell failure

Liora S. Katz, Gabriel Brill, Pili Zhang, Anil Kumar, Sharon Baumel-Alterzon, Lee B. Honig, Nicolás Gómez-Banoy, Esra Karakose, Marius Tanase, Ludivine Doridot, Alexandra Alvarsson, Bennett Davenport, Peng Wang, Luca Lambertini, Sarah A. Stanley, Dirk Homann, Andrew F. Stewart, James C. Lo, Mark A. Herman, Adolfo Garcia-OcañaDonald K. Scott

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Preservation and expansion of β-cell mass is a therapeutic goal for diabetes. Here we show that the hyperactive isoform of carbohydrate response-element binding protein (ChREBPβ) is a nuclear effector of hyperglycemic stress occurring in β-cells in response to prolonged glucose exposure, high-fat diet, and diabetes. We show that transient positive feedback induction of ChREBPβ is necessary for adaptive β-cell expansion in response to metabolic challenges. Conversely, chronic excessive β-cell-specific overexpression of ChREBPβ results in loss of β-cell identity, apoptosis, loss of β-cell mass, and diabetes. Furthermore, β-cell “glucolipotoxicity” can be prevented by deletion of ChREBPβ. Moreover, ChREBPβ-mediated cell death is mitigated by overexpression of the alternate CHREBP gene product, ChREBPα, or by activation of the antioxidant Nrf2 pathway in rodent and human β-cells. We conclude that ChREBPβ, whether adaptive or maladaptive, is an important determinant of β-cell fate and a potential target for the preservation of β-cell mass in diabetes.

Original languageEnglish
Article number4423
JournalNature Communications
Volume13
Issue number1
DOIs
StatePublished - Dec 2022

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