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ATF4-mediated induction of 4E-BP1 contributes to pancreatic beta cell survival under endoplasmic reticulum stress

Suguru Yamaguchi1, Hisamitsu Ishihara, Takahiro Yamada

  • 1Division of Molecular Metabolism and Diabetes, Tohoku University Graduate School of Medicine, Sendai, Miyagi 980-8575, Japan.

Cell Metabolism
|March 5, 2008
PubMed

Insights

The protein 4E-BP1 helps pancreatic beta cells survive endoplasmic reticulum (ER) stress, a key factor in diabetes development. Its absence accelerates beta cell loss and worsens hyperglycemia in diabetes models.

Area of Science:

  • Cell Biology
  • Endocrinology
  • Molecular Biology

Background:

  • Endoplasmic reticulum (ER) stress contributes to pancreatic beta cell loss and diabetes development.
  • Apoptosis, or programmed cell death, is a critical mechanism in beta cell mass reduction.
  • Understanding the molecular pathways that protect beta cells from ER stress is vital for diabetes research.

Purpose of the Study:

  • To investigate the role of 4E-BP1 (eukaryotic initiation factor 4E-binding protein 1) in beta cell survival under ER stress.
  • To determine if 4E-BP1 is involved in the cellular response to ER stress in the context of diabetes.

Main Methods:

  • Examined 4E-BP1 expression in islets from mouse models of diabetes with ER stress.
  • Identified the Eif4ebp1 gene as a direct target of the transcription factor ATF4.
  • Assessed the impact of Eif4ebp1 gene deletion on beta cell apoptosis and translational control in response to ER stress using MIN6 cells and mouse islets.

Main Results:

  • 4E-BP1 expression was elevated in islets experiencing ER stress in diabetic mouse models.
  • Deletion of the Eif4ebp1 gene led to increased susceptibility to ER stress-induced apoptosis in beta cells.
  • Loss of Eif4ebp1 resulted in dysregulated translational control, accelerated beta cell loss, and worsened hyperglycemia in diabetic mice.

Conclusions:

  • 4E-BP1 induction is crucial for maintaining pancreatic beta cell homeostasis during ER stress.
  • The ATF4-Eif4ebp1 pathway plays a protective role in beta cells against ER stress.
  • 4E-BP1 represents a potential therapeutic target for managing diabetes by preserving beta cell function.

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