Lysosomal Signaling Promotes Longevity by Adjusting Mitochondrial Activity

Area of Science:

• Cellular Biology
• Metabolic Homeostasis
• Aging Research

Background:

• Lysosomes and mitochondria are vital organelles for metabolic balance and organismal health.
• Mechanisms connecting lysosome-mitochondria metabolic crosstalk to longevity are not well understood.

Purpose of the Study:

• To investigate the role of lysosomal signaling in regulating mitochondrial activity and promoting longevity.
• To elucidate the molecular pathway linking lysosomal function to metabolic homeostasis and lifespan extension.

Main Methods:

• Utilized Caenorhabditis elegans as a model organism.
• Investigated lysosomal signaling pathways involving LIPL-4 and LBP-8.
• Assessed mitochondrial beta-oxidation, lipid storage, and reactive oxygen species (mtROS) production.
• Analyzed the activation of the JUN-1 transcription factor and its downstream targets.

Main Results:

• Lysosomal signaling mediated by LIPL-4 and LBP-8 enhances mitochondrial beta-oxidation, decreasing lipid accumulation.
• Increased mitochondrial beta-oxidation leads to reduced Complex II activity and increased mitochondrial ROS (mtROS).
• mtROS activates the JUN-1 transcription factor, inducing antioxidant responses and oxidative stress tolerance, ultimately promoting longevity.

Conclusions:

• Lysosomal signaling regulates mitochondrial activity, impacting metabolic fitness and lifespan.
• The LIPL-4-LBP-8 pathway provides a novel link between lysosomal function, mitochondrial metabolism, and organismal longevity.
• These findings highlight the importance of metabolic adjustments for improving redox homeostasis and extending healthspan.