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Lipid Supplementation for Longevity and Gene Transcriptional Analysis in Caenorhabditis elegans

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Published on: December 9, 2022

THow diet interacts with longevity genes.

Andrzej Bartke¹, Michael Bonkowski, Michal Masternak

¹Department of Internal Medicine, Southern Illinois University School of Medicine, Springfield, IL 62794-9628, USA. abartke@siumed.edu

Hormones (Athens, Greece)

|March 25, 2008

Summary

This summary is machine-generated.

Suppressing growth hormone (GH) signaling in mice significantly extends lifespan. Calorie restriction (CR) further boosts longevity in Ames dwarf mice but not GH receptor knockout mice, suggesting distinct aging pathways.

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Area of Science:

Aging research
Genetics
Metabolic studies

Background:

Growth hormone (GH) signaling suppression and calorie restriction (CR) extend mouse lifespan.
Long-lived mutants share phenotypic similarities with CR-fed animals.
Gene expression studies indicate overlapping but distinct effects of longevity genes and CR.

Purpose of the Study:

Investigate the differential effects of CR on lifespan extension in Ames dwarf and GH receptor knockout (GHRKO) mice.
Explore the role of insulin sensitivity in mediating CR's effects on longevity.
Identify molecular biomarkers of CR-associated aging delay.

Main Methods:

Comparative lifespan studies of Ames dwarf and GHRKO mice with and without CR.
Gene expression analysis (microarray, RT-PCR) of insulin and IGF1-related genes.
Assessment of Akt phosphorylation, PPAR beta/delta, JNK1 phosphorylation, and PGC1alpha expression in liver, muscle, and heart.

Main Results:

CR further extends lifespan in Ames dwarf mice but has minimal effect on GHRKO mice.
CR improves insulin sensitivity in Ames dwarfs but not GHRKO mice.
Observed molecular changes include reduced Akt/PPAR beta/delta in liver, reduced JNK1/increased PGC1alpha in muscle, and increased IGF1/insulin receptor in heart.

Conclusions:

The response to CR for longevity extension differs between Ames dwarf and GHRKO mice, likely due to baseline insulin sensitivity.
Identified molecular changes may represent mechanisms of CR action or biomarkers for delayed aging.