Lysosomes in nutrient signalling: A focus on pancreatic β-cells

Area of Science:

• Cellular biology
• Endocrinology
• Metabolism

Background:

• Regulated insulin secretion by pancreatic beta cells is vital for glucose homeostasis.
• Obesity and nutrient overload trigger adaptive mechanisms in beta cells, but failure leads to Type 2 Diabetes (T2D).
• Nutrient-dependent macroautophagy is a key adaptive mechanism in beta cells, declining in later stages of T2D.

Purpose of the Study:

• To review how lysosome-signaling cascades impact macroautophagy flux in beta cells.
• To connect lysosomal signaling pathways to insulin secretion under metabolic stress.
• To highlight mechanisms compromising beta-cell macroautophagy in T2D.

Main Methods:

• Literature review focusing on recent discoveries in lysosomal signaling and macroautophagy.
• Analysis of signaling cascades emanating from lysosome membranes.
• Integration of findings within the context of beta-cell physiology and T2D pathogenesis.

Main Results:

• Lysosomal signaling pathways significantly influence macroautophagy flux.
• These pathways are linked to nutrient sensing and insulin secretion in beta cells.
• Dysregulation of these pathways contributes to beta-cell dysfunction.

Conclusions:

• Understanding lysosome-centric signaling is crucial for beta-cell health.
• Targeting these pathways may offer novel therapeutic strategies for T2D.
• Preserving macroautophagy through lysosomal signaling could prevent beta-cell failure.