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

Alessandro Matarese1,2, Jessica Gambardella1,3, Angela Lombardi1,4

  • 1Department of Medicine, Fleischer Institute for Diabetes and Metabolism (FIDAM), Einstein-Mount Sinai Diabetes Research Center (ES-DRC), Albert Einstein College of Medicine, New York, NY 10461, USA.

Cells
|July 10, 2020
PubMed

Insights

MicroRNAs regulate insulin release by targeting beta-arrestin 1, a key player in the glucagon-like peptide-1 receptor pathway. This finding impacts type 2 diabetes treatment strategies.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Diabetes Research

Background:

  • Glucagon-like peptide-1 (GLP-1) enhances insulin secretion via its receptor on pancreatic beta cells.
  • Beta-arrestin 1 (βARR1) desensitizes the GLP-1 receptor, influencing insulin release.
  • MicroRNAs (miRNAs) are increasingly recognized for their role in regulating beta cell function and insulin secretion.

Purpose of the Study:

  • To investigate the role of specific miRNAs in modulating the GLP-1/βARR1 signaling axis in beta cells.
  • To identify and validate miRNAs that target βARR1 and influence GLP-1-mediated insulin release.

Main Methods:

  • Bioinformatic analysis to predict miRNAs targeting βARR1.
  • Validation of the interaction between identified miRNA (hsa-miR-7-5p, miR-7) and βARR1.
  • Experimental verification of GLP-1's regulation on miR-7 and βARR1 transcription.
  • Assessment of miR-7's impact on GLP-1-induced insulin release and cyclic AMP (cAMP) production in beta cells.

Main Results:

  • Hsa-miR-7-5p (miR-7) was identified as a miRNA targeting βARR1.
  • GLP-1 was confirmed to regulate the transcription of both miR-7 and βARR1.
  • miR-7 significantly modulated GLP-1-induced insulin secretion and cAMP production in beta cells.
  • A direct functional role for miR-7 in targeting βARR1 and regulating GLP-1-mediated insulin release was established.

Conclusions:

  • miR-7 plays a crucial role in regulating GLP-1-mediated insulin release by targeting βARR1 in pancreatic beta cells.
  • This discovery provides novel insights into the molecular mechanisms governing insulin secretion.
  • The findings have significant clinical implications for the development of therapeutic strategies for type 2 diabetes mellitus targeting GLP-1 signaling.
Keywords:
cAMPdiabetesepigeneticsglucose-stimulated insulin secretion (GSIS)miRNA-7β-arrestin 1

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