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The Translational Repressor 4E-BP1 Contributes to Diabetes-Induced Visual Dysfunction.

William P Miller1, Maria L Mihailescu1, Chen Yang1

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Elevated 4E-BP1 protein expression, driven by hyperglycemia, contributes to diabetic retinopathy. Inhibiting 4E-BP1/2 in mice delayed diabetes-induced vision loss, revealing a key mechanism in diabetic eye disease.

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Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Endocrinology

Background:

  • The translational repressor 4E-BP1 (eukaryotic translation initiation factor 4E-binding protein 1) interacts with eIF4E, promoting cap-independent translation.
  • This process is implicated in diabetic retinopathy, a complication of diabetes.
  • 4E-BP1 expression is elevated in the retinas of diabetic rodents.

Purpose of the Study:

  • To investigate the role of 4E-BP1 in diabetes-induced visual dysfunction.
  • To elucidate the mechanism by which hyperglycemia increases 4E-BP1 expression.

Main Methods:

  • Visual function was assessed in nondiabetic and diabetic wild-type and 4E-BP1/2 knockout mice using an optomotor test.
  • Retinas were analyzed for protein levels and posttranslational modifications.
  • Retinal cells in culture were exposed to hyperglycemia or an O-GlcNAcase inhibitor (Thiamet G).

Main Results:

  • Mice lacking 4E-BP1/2 showed delayed diabetes-induced visual dysfunction.
  • Hyperglycemia and Thiamet G increased 4E-BP1 expression in retinal cells.
  • Hyperglycemia and Thiamet G prolonged 4E-BP1 degradation by inhibiting polyubiquitination via its PEST motif.

Conclusions:

  • Elevated 4E-BP1 expression in diabetic retinas is due to O-GlcNAcylation within its PEST motif.
  • This mechanism contributes to diabetic retinopathy pathogenesis.
  • Targeting 4E-BP1 may offer a therapeutic strategy for diabetic eye disease.