miR-7 Regulates GLP-1-Mediated Insulin Release by Targeting β-Arrestin 1

Alessandro Matarese, Jessica Gambardella, Angela Lombardi, Xujun Wang, Gaetano Santulli

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Glucagon-like peptide-1 (GLP-1) has been shown to potentiate glucose-stimulated insulin secretion binding GLP-1 receptor on pancreatic β cells. β-arrestin 1 (βARR1) is known to regulate the desensitization of GLP-1 receptor. Mounting evidence indicates that microRNAs (miRNAs, miRs) are fundamental in the regulation of β cell function and insulin release. However, the regulation of GLP-1/βARR1 pathways by miRs has never been explored. Our hypothesis is that specific miRs can modulate the GLP-1/βARR1 axis in β cells. To test this hypothesis, we applied a bioinformatic approach to detect miRs that could target βARR1; we identified hsa-miR-7-5p (miR-7) and we validated the specific interaction of this miR with βARR1. Then, we verified that GLP-1 was indeed able to regulate the transcription of miR-7 and βARR1, and that miR-7 significantly regulated GLP-1-induced insulin release and cyclic AMP (cAMP) production in β cells. Taken together, our findings indicate, for the first time, that miR-7 plays a functional role in the regulation of GLP-1-mediated insulin release by targeting βARR1. These results have a decisive clinical impact given the importance of drugs modulating GLP-1 signaling in the treatment of patients with type 2 diabetes mellitus.

Original languageEnglish (US)
JournalCells
Volume9
Issue number7
DOIs
StatePublished - Jul 6 2020

Keywords

  • cAMP
  • diabetes
  • epigenetics
  • glucose-stimulated insulin secretion (GSIS)
  • miRNA-7
  • β-arrestin 1

ASJC Scopus subject areas

  • Medicine(all)

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