Exploring the precision redox map during fasting-refeeding and satiation in C. elegans

Area of Science:

• Cellular Metabolism
• Redox Biology
• Animal Models

Background:

• Fasting is a popular dietary strategy with numerous health benefits.
• Redox regulation is a key mechanism underlying fasting's effects.
• Precise redox changes in different cellular compartments during fasting remain unclear.

Purpose of the Study:

• To systematically map redox changes in living animals under various dietary conditions.
• To investigate the roles of hydrogen peroxide (H₂O₂) and glutathione (GSH/GSSG) redox states.
• To explore these changes in specific organelles (cytoplasm, mitochondria, ER) and tissues (muscle, neurons).

Main Methods:

• Construction of twelve genetically encoded redox-sensitive C. elegans strains.
• Utilized Hyperion (H₂O₂) and Grx1-roGFP2 (GSH/GSSG) fluorescent probes.
• Confocal microscopy was employed to measure redox changes during fasting, refeeding, and satiation.

Main Results:

• Fasting generally decreased H₂O₂ but increased GSSG/GSH in specific cellular compartments.
• Refeeding reversed most fasting-induced redox alterations in both tissues and organelles.
• A satiated state led to increased H₂O₂ in most compartments and elevated GSSG/GSH in specific muscle ER.

Conclusions:

• This study provides a precise redox map of C. elegans under different dietary states.
• Findings offer a basis for understanding redox mechanisms in metabolism.
• Results can aid in optimizing dietary guidance for metabolic health.