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The eukaryotic translation initiation factor 2, a hero turned villain in β cells

par Abdulkarim, Baroj
Président du jury Langer, Ingrid
Promoteur Cnop, Miriam
Co-Promoteur Igoillo Esteve, Mariana
Publication Non publié, 2017-06-06

Thèse de doctorat

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Résumé :

The prevalence of type 2 diabetes is increasing dramatically worldwide. Type 2 diabetes is a major health and socio-economic burden. Genetic predisposition and the obesity epidemic, due to sedentary life style and high caloric food intake, are associated with development of type 2 diabetes. Circulating free fatty acids (FFAs), in particular saturated FFAs, are linked with insulin resistance and β cell dysfunction. Following this background we performed RNA sequencing of human pancreatic islets treated with the saturated FFA palmitate to acquire a global image of the islet response to this insult. We identified several stress pathways induced by palmitate with a major induction of the endoplasmic reticulum (ER) stress response. The ER stress response, in particular the PKR-like ER kinase (PERK) branch, has been shown to be induced by saturated FFA. It leads to increased β cell apoptosis both in fluorescence activated cell sorter (FACS) purified rat β cells and human islets. We further clarified the role of this pathway by studying the involvement of the constitutive repressor of eIF2α phosphorylation (CReP) in a monogenic form of diabetes. CReP is a repressor of eukaryotic translation initiation factor 2α (eIF2α) phosphorylation. A direct target of PERK, eIF2α is involved in translational attenuation and induction of apoptosis. We have shown that CReP loss-of-function leads to a new syndrome of young onset diabetes, intellectual disability and microcephaly. The identified R658C mutation abrogated CReP activity leading to increased eIF2α phosphorylation and β cell apoptosis. To further demonstrate the importance of eIF2α dysregulation in β cell demise, we used guanabenz, a chemical inhibitor of growth arrest DNA damage inducible 34 (GADD34). GADD34 is an ER stress-induced repressor of eIF2α phosphorylation. Guanabenz potentiated FFA-mediated ER stress and apoptosis in clonal and primary rat β cells and in human islets through the activation of CCAAT/enhancer binding protein homologous protein (CHOP), downstream of eIF2α. Guanabenz administration in mice impaired glucose tolerance and led to β cell dysfunction. In ex vivo experiments guanabenz also induced β cell dysfunction in mouse and rat islets.In conclusion our data demonstrate that the dysregulation of signaling in the PERK/eIF2α pathway is crucial for β cell demise. Together with previously reported monogenic diabetes caused by loss-of-function mutations in PERK in man and the eIF2αS51A mutation in mice, our findings suggest that a narrow regulation of PERK/eIF2α signaling is central for proper β cell function and survival.