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Area of Science:

  • Cellular biology
  • Metabolic regulation
  • Endocrinology

Background:

  • Autophagy dynamically regulates beta-cell function, but its precise role in response to nutrient cues like fasting-feeding cycles remains unclear.
  • Mechanistic target of rapamycin complex 1 (mTORC1) integrates nutrient signals (leucine, glucose) in beta-cells, influencing cellular processes.

Purpose of the Study:

  • To investigate the dynamic regulation of autophagy in pancreatic beta-cells by nutrient availability (fasting-feeding cycles).
  • To elucidate the role of mTORC1 signaling in controlling autophagy and insulin secretion under varying nutritional states.

Main Methods:

  • Utilized Raptor knockout models to inhibit mTORC1 signaling in beta-cells.
  • Assessed autophagy initiation (ULK1, TFEB) and insulin secretion in response to nutrient stimulation and mTORC1 inhibition.

Main Results:

  • Nutrient stimulation of mTORC1 prevented autophagy by inhibiting ULK1 and TFEB, particularly under continuous nutrient exposure.
  • mTORC1 inhibition (Raptor knockout) mimicked fasting, induced autophagy, and suppressed insulin secretion; partial autophagy inhibition rescued insulin secretion.
  • Fasting-state autophagy, regulated by mTORC1, is essential for maintaining low insulin levels and preventing hypoglycemia.

Conclusions:

  • mTORC1 acts as a critical regulator of insulin secretion by modulating autophagy in response to nutritional status.
  • Elevated mTORC1 signaling, driven by nutrients like leucine and glucose common in obesity, may contribute to hyperinsulinemia through autophagy inhibition.