Type 2 diabetes risk gene Dusp8 regulates hypothalamic Jnk signaling and insulin sensitivity

0559937 - ÚMG 2023 RIV US eng J - Journal Article
Schriever, S.C. - Rozman, Jan - Schmidt, M. - Pfluger, P. T. - Kabra, D. G. - Pfuhlmann, K. - Baumann, P. - Baumgart, E. V. - Nagler, J. - Seebacher, F. - Harrison, L. - Irmler, M. - Kullmann, S. - Correa-da-Silva, F. - Giesert, F. - Jain, R. - Schug, H. - Castel, J. - Martinez, S. - Wu, M. - Häring, H. U. - Hrabe de Angelis, M. - Beckers, J. - Stemmer, K. - Wurst, W. … Total 34 authors
Type 2 diabetes risk gene Dusp8 regulates hypothalamic Jnk signaling and insulin sensitivity.
Journal of Clinical Investigation. Roč. 130, č. 11 (2020), s. 6093-6108. ISSN 0021-9738. E-ISSN 1558-8238
Institutional support: RVO:68378050
Keywords : Glucocorticoid-receptor * Resistance * Glucose * Obesity * Inflammation * Association * Expression * Stress * Brain * Responsiveness
OECD category: Medicinal chemistry
Impact factor: 14.808, year: 2020
Method of publishing: Open access
https://www.jci.org/articles/view/136363

Recent genome-wide association studies (GWAS) identified DUSP8, encoding a dual-specificity phosphatase targeting mitogen-activated protein kinases, as a type 2 diabetes (T2D) risk gene. Here, we reveal that Dusp8 is a gatekeeper in the hypothalamic control of glucose homeostasis in mice and humans. Male, but not female, Dusp8 loss-of-function mice, either with global or corticotropin-releasing hormone neuron-specific deletion, had impaired systemic glucose tolerance and insulin sensitivity when exposed to high-fat diet (HFD). Mechanistically, we found impaired hypothalamic-pituitary-adrenal axis feedback, blunted sympathetic responsiveness, and chronically elevated corticosterone levels driven by hypothalamic hyperactivation of Jnk signaling. Accordingly, global/Jnk1 ablation, AAV-mediated Dusp8 overexpression in the mediobasal hypothalamus, or metyrapone-induced chemical adrenalectomy rescued the impaired glucose homeostasis of obese male Dusp8-KO mice, respectively. The sex-specific role of murine Dusp8 in governing hypothalamic Jnk signaling, insulin sensitivity, and systemic glucose tolerance was consistent with functional MRI data in human volunteers that revealed an association of the DUSP8 rs2334499 risk variant with hypothalamic insulin resistance in men. Further, expression of DUSP8 was increased in the infundibular nucleus of T2D humans. In summary, our findings suggest the GWAS-identified gene Dusp8 as a novel hypothalamic factor that plays a functional role in the etiology of T2D.
Permanent Link: https://hdl.handle.net/11104/0333056