Stress-induced microrna-708 impairs b-cell function and growth

Júlia Rodríguez-Comas, Alba Moreno-Asso, Juan Moreno-Vedia, Mercè Martín, Carlos Castaño, Anna Marzà-Florensa, Xavier Bofill-De Ros, Joan Mir-Coll, Joel Montané, Cristina Fillat, Rosa Gasa, Anna Novials, Joan Marc Servitja

Research output: Indexed journal article Articlepeer-review

34 Citations (Scopus)

Abstract

The pancreatic β-cell transcriptome is highly sensitive to external signals such as glucose oscillations and stress cues. MicroRNAs (miRNAs) have emerged as key factors in gene expression regulation. Here, we aimed to identify miRNAs that are modulated by glucose in mouse pancreatic islets.We identified miR-708 as the most upregulatedmiRNA in islets cultured at low glucose concentrations, a setting that triggers a strong stress response.miR-708 was also potently upregulated by triggering endoplasmic reticulum (ER) stress with thapsigargin and in islets of ob/ob mice. Low-glucose induction of miR-708 was blocked by treatment with the chemical chaperone 4-phenylbutyrate, uncovering the involvement of ER stress in this response. An integrative analysis identified neuronatin (Nnat) as a potential glucoseregulated target of miR-708. Indeed, Nnat expression was inversely correlated with miR-708 in islets cultured at different glucose concentrations and in ob/ob mouse islets and was reduced after miR-708 overexpression. Consistent with the role of Nnat in the secretory function of β-cells, miR-708 overexpression impaired glucosestimulated insulin secretion (GSIS), which was recovered by NNAT overexpression. Moreover, miR-708 inhibition recovered GSIS in islets cultured at low glucose. Finally, miR-708 overexpression suppressed β-cell proliferation and induced β-cell apoptosis. Collectively, our results provide a novel mechanism of glucose regulation of β-cell function and growth by repressing stress-induced miR-708.

Original languageEnglish
Pages (from-to)3029-3040
Number of pages12
JournalDiabetes
Volume66
Issue number12
DOIs
Publication statusPublished - 1 Dec 2017
Externally publishedYes

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