Autophagy-mediated longevity is modulated by lipoprotein biogenesis

Area of Science:

• Gerontology
• Molecular Biology
• Cell Biology

Background:

• Autophagy-dependent longevity in C. elegans is linked to altered lipid storage, but the precise role of lipid distribution in lifespan extension remains unclear.
• Lipoprotein production, autophagy, and lysosomal lipolysis are key cellular processes potentially involved in aging.

Purpose of the Study:

• To investigate the link between lipoprotein production, autophagy, and lysosomal lipolysis in modulating lifespan.
• To identify the molecular mechanisms and conserved pathways governing aging and lipid metabolism.

Main Methods:

• Utilized C. elegans models to study the effects of altering vitellogenin (VIT) expression on lifespan.
• Investigated the role of nuclear hormone receptors (NHRs) NHR-49 and NHR-80 in lifespan extension.
• Examined gene expression related to autophagy and lysosomal function.
• Compared findings with dietary restriction models in worms and mice, analyzing VIT and apolipoprotein B (APOB) expression.

Main Results:

• Overexpression of VIT reduced lifespan in long-lived animals by impairing autophagy and lysosomal genes.
• Reducing vitellogenesis or enhancing lysosomal lipolysis extended lifespan, dependent on NHR-49 and NHR-80.
• Dietary restriction in worms and mice showed reduced VIT and hepatic APOB expression, respectively.
• Lipoprotein biogenesis was identified as a mechanism modulating aging by impairing autophagy and lysosomal lipolysis.

Conclusions:

• Lipoprotein biogenesis is a conserved mechanism that modulates aging by negatively impacting autophagy and lysosomal lipolysis.
• NHR-49 and NHR-80 play crucial roles in lysosomal lipid signaling and lifespan extension.
• Targeting lipoprotein production presents a potential strategy for interventions aimed at promoting longevity.