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Leprdb Mouse Model of Type 2 Diabetes: Pancreatic Islet Isolation and Live-cell 2-Photon Imaging Of Intact Islets
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Leprdb Mouse Model of Type 2 Diabetes: Pancreatic Islet Isolation and Live-cell 2-Photon Imaging Of Intact Islets

Published on: May 11, 2015

Sirtuin 3 regulates mouse pancreatic beta cell function and is suppressed in pancreatic islets isolated from human

P W Caton1, S J Richardson, J Kieswich

  • 1Centre for Diabetes, Blizard Institute, Bart's and the London School of Medicine and Dentistry, Queen Mary University of London, 4 Newark Street, London E1 2AT, UK. p.w.caton@qmul.ac.uk

Diabetologia
|February 12, 2013
PubMed
Abstract

Insights

Decreased Sirtuin 3 (SIRT3) in pancreatic beta cells contributes to type 2 diabetes by increasing oxidative stress and inflammation. Restoring SIRT3 levels may offer a novel therapeutic strategy for type 2 diabetes.

Area of Science:

  • Mitochondrial biology
  • Endocrinology
  • Diabetes research

Background:

  • Sirtuin 3 (SIRT3) is a mitochondrial deacetylase regulating reactive oxygen species (ROS) and inflammation.
  • Pancreatic beta cell dysfunction, driven by inflammation and mitochondrial issues, is central to type 2 diabetes.

Purpose of the Study:

  • To investigate SIRT3's role in maintaining pancreatic beta cell function and mass in type 2 diabetes.
  • To explore SIRT3 as a potential therapeutic target for type 2 diabetes.

Main Methods:

  • Analysis of SIRT3 expression in experimental type 2 diabetes models and human diabetic islets.
  • Assessment of SIRT3 knockdown effects on beta cell function and mass in INS1 cells.

Main Results:

  • SIRT3 expression was significantly reduced in type 2 diabetic human islets and experimental models.
  • SIRT3 knockdown in INS1 cells impaired insulin secretion, increased apoptosis, and reduced key gene expression.
  • SIRT3 knockdown exacerbated ROS and IL1β levels, blocking protective effects of nicotinamide mononucleotide.

Conclusions:

  • Reduced beta cell SIRT3 is a critical factor in type 2 diabetes onset, mediated by elevated ROS and IL1β.
  • Therapeutic strategies targeting SIRT3 activity or levels present a promising avenue for type 2 diabetes treatment.

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