Peer Reviewed

1

Document Type

Article

Publication Date

Fall 5-10-2015

Keywords

BH3-Only protein, glucose homeostasis, HNF1α-MODY, diabetes

Funder/Sponsor

Health Research Board, Science Foundation Ireland, RCSI

Comments

The original article is available at http://www.nature.com/articles/cddiscovery201541

Abstract

Heterozygous loss-of-function mutations in the hepatocyte nuclear factor 1α (HNF-1α) gene can lead to diminished amounts of functional HNF-1α, resulting in the onset of a particularly severe form of maturity-onset diabetes of the young (MODY). We have previously shown that induction of a dominant-negative mutant of HNF-1α (DNHNF-1α) results in the activation of the bioenergetic stress sensor AMP-activated protein kinase (AMPK), preceding the onset of apoptosis and the induction of pro-apoptotic Bcl-2 homology domain-3-only protein Bmf (Bcl-2-modifying factor) as a mediator of DNHNF-1α-induced apoptosis. Through the knockout of bmf in a transgenic mouse model with DNHNF-1α suppression of HNF-1α function in pancreatic beta-cells, this study aimed to examine the effect of loss-of-function of this BH3-only protein on the disease pathology and progression, and further elucidate the role of Bmf in mediating DNHNF-1α-induced beta-cell loss. Morphological analysis revealed an attenuation in beta-cell loss in bmf-deficient diabetic male mice and preserved insulin content. Surprisingly, bmf deficiency was found to exacerbate hyperglycemia in both diabetic male and hyperglycemic female mice, and ultimately resulted in a decreased glucose-stimulated insulin response, implicating a role for Bmf in glucose homeostasis regulation independent of an effect on beta-cell loss. Collectively, our data demonstrate that Bmf contributes to the decline in beta-cells in a mouse model of HNF1A-MODY but is also required for the maintenance of glucose homeostasis in vivo.

Disciplines

Endocrine System Diseases | Endocrinology, Diabetes, and Metabolism | Medical Cell Biology | Medical Physiology | Nutritional and Metabolic Diseases | Physics | Physiological Processes | Physiology

Citation

Pfeiffer S, Halang L, Dussmann H, Byrne MM, Prehn JHM. BH3-Only protein bmf is required for the maintenance of glucose homeostasis in an in vivo model of HNF1α-MODY diabetes. Cell Death Discovery. 2015;1:15041. doi:10.1038/cddiscovery.2015.41

DOI Link

10.1038/cddiscovery.2015.41

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.