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Pharmacologic or genetic activation of SIRT1 attenuates the fat-induced decrease in beta-cell function in vivo.

Tejas Desai1, Khajag Koulajian1, Aleksandar Ivovic1

  • 1Department of Physiology, University of Toronto, Toronto, ON, Canada.

Nutrition & Diabetes
|March 21, 2019
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Summary
This summary is machine-generated.

Sirtuin 1 (SIRT1) activation partially protected against fat-induced decreases in beta-cell function. This suggests SIRT1 is a therapeutic target for conditions involving impaired beta-cell function due to excess lipids.

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Area of Science:

  • Metabolic regulation
  • Endocrinology
  • Cellular biology

Background:

  • Sirtuin 1 (SIRT1) regulates nutrient metabolism and enhances beta-cell secretory function.
  • Obesity-related excess lipids impair beta-cell function, potentially via reduced SIRT1 activity.
  • SIRT1 activation may restore beta-cell function in states of high plasma-free fatty acids.

Purpose of the Study:

  • To investigate the role of SIRT1 in mitigating lipid-induced beta-cell dysfunction.
  • To evaluate the therapeutic potential of SIRT1 activation in models of fat overload.

Main Methods:

  • Pharmacologic model: Wistar rats infused with oleate +/- resveratrol (SIRT1 activator).
  • Genetic model: Beta-cell-specific SIRT1-overexpressing (BESTO) mice and wild-type littermates infused with oleate.
  • Beta-cell function assessed via hyperglycemic clamp after 48-hour infusions.

Main Results:

  • Lipid infusion significantly decreased beta-cell function in both rats and mice.
  • SIRT1 activation, without affecting normal beta-cell function, provided partial protection against lipid-induced dysfunction.
  • No significant difference was observed between SIRT1 activation groups and controls in the context of fat-induced impairment.

Conclusions:

  • SIRT1 activation offers partial protection against fat-induced beta-cell dysfunction.
  • SIRT1 represents a potential therapeutic target for treating beta-cell impairment caused by excess lipids.