To investigate the protective role of Nicotinamide Mononucleotide (NMN) against endothelial hyperpermeability specifically induced by pro-inflammatory M1 macrophages.
Key Findings:
M1 macrophage co-culture increased HUVEC permeability, which was attenuated by NMN pretreatment, indicating NMN's protective effect.
IL-1β released by M1 macrophages was identified as the primary contributor to endothelial hyperpermeability.
NMN inhibited IL-1β-induced cell-cell gap formation and VE-cadherin degradation by suppressing NF-κB pathway activation.
Other NAD+ precursors also provided protection against IL-1β-induced hyperpermeability.
Inhibition of SIRT1 abrogated NMN's protective effects, indicating dependence on the NAD+-SIRT1 axis.
Interpretation:
The study suggests that NMN may protect endothelial barrier integrity by modulating the IL-1β-induced inflammatory response through the NAD+-SIRT1 pathway, highlighting its potential therapeutic role.
Limitations:
The study was conducted in vitro, which may not fully replicate in vivo conditions.
Further research is needed to confirm findings in animal models and clinical settings.
Diverse experimental conditions should be explored to strengthen the findings.
Conclusion:
NMN shows potential as a therapeutic agent in preventing endothelial dysfunction in inflammatory vascular diseases, warranting further investigation.
