Open AccessThe Lysine Demethylase KDM5B Regulates Islet Function and Glucose Homeostasis
Author(s) -
Marie Balslev Backe,
Chunyu Jin,
Luz Andreone,
Aditya Sankar,
Karl Agger,
Kristian Helin,
Andreas Nygaard Madsen,
Steen Seier Poulsen,
Madhusudhan Bysani,
Karl Bacos,
Charlotte Ling,
Marcelo J. Perone,
Birgitte Holst,
Thomas MandrupPoulsen
Publication year - 2019
Publication title -
journal of diabetes research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.034
H-Index - 50
eISSN - 2314-6753
pISSN - 2314-6745
DOI - 10.1155/2019/5451038
Subject(s) - demethylase , medicine , endocrinology , insulin , islet , diabetes mellitus , biology , glucose homeostasis , downregulation and upregulation , epigenetics , chemistry , microbiology and biotechnology , insulin resistance , biochemistry , gene
Aims Posttranslational modifications of histones and transcription factors regulate gene expression and are implicated in beta-cell failure and diabetes. We have recently shown that preserving H3K27 and H3K4 methylation using the lysine demethylase inhibitor GSK-J4 reduces cytokine-induced destruction of beta-cells and improves beta-cell function. Here, we investigate the therapeutic potential of GSK-J4 to prevent diabetes development and examine the importance of H3K4 methylation for islet function.Materials and Methods We used two mouse models of diabetes to investigate the therapeutic potential of GSK-J4. To clarify the importance of H3K4 methylation, we characterized a mouse strain with knockout (KO) of the H3K4 demethylase KDM5B.Results GSK-J4 administration failed to prevent the development of experimental diabetes induced by multiple low-dose streptozotocin or adoptive transfer of splenocytes from acutely diabetic NOD to NODscid mice. KDM5B-KO mice were growth retarded with altered body composition, had low IGF-1 levels, and exhibited reduced insulin secretion. Interestingly, despite secreting less insulin, KDM5B-KO mice were able to maintain normoglycemia following oral glucose tolerance test, likely via improved insulin sensitivity, as suggested by insulin tolerance testing and phosphorylation of proteins belonging to the insulin signaling pathway. When challenged with high-fat diet, KDM5B-deficient mice displayed similar weight gain and insulin sensitivity as wild-type mice.Conclusion Our results show a novel role of KDM5B in metabolism, as KDM5B-KO mice display growth retardation and improved insulin sensitivity.