Caloric restriction impacts plasma microRNAs in rhesus monkeys

Area of Science:

• Gerontology
• Molecular Biology
• Genomics

Background:

• Caloric restriction (CR) is a proven aging delay intervention across species.
• Understanding CR's molecular mechanisms is key for human health and longevity.
• MicroRNAs (miRNAs) are implicated in aging processes.

Purpose of the Study:

• To investigate the role of circulating miRNAs in caloric restriction's aging-delay effects in primates.
• To identify specific miRNAs and pathways regulated by CR.
• To explore the translational potential of these findings for human aging.

Main Methods:

• Deep sequencing of plasma RNA to identify and quantify miRNAs in rhesus monkeys under CR.
• Bioinformatic analysis including sequence alignment, target identification, and pathway enrichment.
• Regression analysis to correlate miRNA levels with physiological parameters like body weight and insulin sensitivity.

Main Results:

• CR significantly altered the abundance of 34 miRNA species (24 known, 10 novel).
• 70% of detected miRNAs were conserved between rhesus monkeys and humans.
• CR-regulated miRNAs were linked to growth, insulin signaling, ribosomal, mitochondrial, and spliceosomal pathways.

Conclusions:

• Circulating miRNAs are involved in the aging-delay mechanisms of caloric restriction in primates.
• CR-induced miRNA changes correlate with key metabolic and aging indicators.
• These findings suggest miRNA-based homeostatic mechanisms coordinate aging programs modulated by CR.