Comprehensive evaluation of lifespan-extending molecules in C. elegans.

Area of Science:

• Gerontology and Molecular Biology
• Model Organism Research

Background:

• Caenorhabditis elegans is a key model for aging research, with identified longevity pathways like daf-2 (IGF1) and age-1 (PI3K).
• Reproducibility of lifespan-extending compounds in C. elegans is challenging due to factors like drug-bacteria interactions.

Purpose of the Study:

• To evaluate the efficacy and reproducibility of 16 frequently reported lifespan-extending molecules in C. elegans.
• To investigate the impact of diet, bacterial interactions, nematode strain, and treatment age on compound effectiveness.
• To identify novel lifespan-extending compounds and assess cross-species conservation.

Main Methods:

• Tested 16 compounds on C. elegans lifespan using live and UV-killed OP50 diets.
• Assessed compound effects on bacterial growth and different nematode strains.
• Evaluated lifespan extension across various starting treatment ages and in Drosophila melanogaster.

Main Results:

• Confirmed lifespan extension by many, but not all, tested compounds.
• Identified additive effects when combining certain compounds.
• Demonstrated conserved lifespan extension effects in D. melanogaster for some compounds.
• Discovered novel lifespan-extending molecules through broader screening.

Conclusions:

• Many commonly cited C. elegans lifespan-extending compounds show robust effects, but reproducibility requires careful consideration of experimental conditions.
• Compound efficacy can be influenced by diet and bacterial interactions.
• Some lifespan-extending effects are conserved across species, suggesting fundamental aging mechanisms.
• This study identified novel compounds and refined understanding of existing ones for aging research.