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Activation of Melatonin Signaling Promotes β-Cell Survival and Function

Safia Costes1, Marti Boss, Anthony P Thomas

  • 1Department of Medicine (S.C., M.B., A.P.T., A.V.M.), David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California 90095; and Department of Physiology and Biomedical Engineering (A.V.M.), Mayo Clinic School of Medicine, Mayo Clinic Rochester, Minnesota 55905.

Molecular Endocrinology (Baltimore, Md.)
|February 20, 2015
PubMed

Insights

Melatonin (MT) signaling protects pancreatic beta cells from damage in type 2 diabetes. This pathway enhances beta cell function and survival, suggesting potential therapeutic benefits for diabetes treatment.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Diabetes Research

Background:

  • Type 2 diabetes mellitus (T2DM) involves pancreatic beta-cell failure, impacting insulin secretion and mass.
  • Genetic links between melatonin receptor 2 (MT2) variants and T2DM suggest MT signaling's role in beta-cell health.

Purpose of the Study:

  • To investigate if MT signaling activation can protect beta cells from proteotoxicity-induced apoptosis.
  • To explore the molecular mechanisms underlying MT signaling's effects on beta-cell function and survival.
  • To assess MT signaling's potential to counteract glucotoxicity and T2DM-related detrimental effects in human islets.

Main Methods:

  • Utilized INS 832/13 cell line to model beta-cell responses to MT signaling activation and proteotoxicity.
  • Employed nondiabetic and T2DM human islets to evaluate MT signaling's impact on glucose-stimulated insulin secretion (GSIS).
  • Assessed apoptosis markers (caspase-3 cleavage, SAPK/JNK activation) and oxidative stress responses.

Main Results:

  • MT signaling activation in beta cells significantly boosted cAMP signaling and attenuated apoptosis by ~40% (caspase-3) and ~50% (JNK).
  • MT signaling reduced oxidative stress responses in beta cells.
  • In human islets, MT signaling restored GSIS in both chronic hyperglycemia and T2DM conditions.

Conclusions:

  • Beta-cell MT signaling is crucial for regulating beta-cell survival and function.
  • MT signaling demonstrates preventative and therapeutic potential for preserving beta-cell mass and function in T2DM.
  • Targeting MT signaling may offer a novel strategy for managing type 2 diabetes.

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