New NAD World 3.0 Theory Emphasises NMN’s Importance In Aging

Reference:  https://www.nmn.com/news/new-nad-world-3-0-theory-emphasizes-nmns-importance-in-aging

In February 2025, Dr. Shin-Ichiro Imai introduced the NAD World 3.0 theory, highlighting the pivotal role of nicotinamide mononucleotide (NMN) in the aging process.  This updated model builds upon previous concepts by incorporating recent findings about NMN transport and synthesis.

Key Components of NAD World 3.0:

1. eNAMPT:  An enzyme that circulates in the bloodstream within extracellular vesicles, facilitating NMN synthesis and thereby sustaining NAD+ levels.
2. Slc12a8 Transporter:  A cellular transporter predominantly located in the small intestine, responsible for the direct uptake of NMN into cells.
3. Involved Tissues:
   • Hypothalamus:  Acts as the central regulator of aging processes.
   • Skeletal Muscle:  Serves as a mediator in aging-related changes.
   • Adipose Tissue:  Functions as a modulator influencing metabolic and aging pathways.
   • Small Intestine:  Newly added in this model, it acts as a signal generator due to its role in NMN absorption via the Slc12a8 transporter.

The NAD World 3.0 theory suggests that declining systemic NAD+ levels trigger an increase in Slc12a8 transporters in the small intestine.  This upregulation enhances NMN uptake, subsequently boosting NAD+ synthesis to meet the body's demands.  Through this mechanism, NMN is positioned as a crucial factor in maintaining NAD+ balance, thereby influencing the aging process.

This comprehensive framework offers a deeper understanding of how NMN and related pathways contribute to aging, potentially guiding future research and therapeutic strategies aimed at promoting healthy longevity.