NNMTi: Novel NNMT Inhibitor for Sarcopenia Research and Aged Muscle Regeneration

NNMTi is a small molecule compound with the molecular formula C₁₀H₁₁IN₂ and a molecular weight of approximately 286.11 Da. It appears as a brown to reddish-brown solid powder. It is a selective inhibitor of nicotinamide N-methyltransferase (NNMT), acting at the enzyme's substrate binding site with an inhibitory concentration (IC₅₀) of 1.2 μM.

NNMT is a cytoplasmic enzyme whose expression is upregulated in aged skeletal muscle, closely associated with impaired NAD⁺ salvage synthesis pathways, dysregulated SIRT1 activity, and muscle stem cell senescence. NNMT inhibitors exhibit favorable drug-like properties and are soluble in DMSO and water. Storage conditions: Powder can be stored for 3 years at -20°C in a sealed, moisture-proof container at 4°C; solutions can be stored for 1-2 years at -80°C.

(1) Muscle Regeneration and Aging Research: NNMTi is widely used to activate the function of aged muscle stem cells (muSCs) and enhance regenerative capacity following skeletal muscle injury in the elderly. In aged mouse models of muscle injury, NNMTi treatment significantly enhances the proliferation, fusion, and regenerative capabilities of muscle stem cells.

(2) Metabolic Disorder Research: NNMTi is employed in studies of obesity-related metabolic syndrome to improve metabolic parameters and insulin sensitivity. Research indicates that NNMTi combined with a low-fat diet promotes systemic fat reduction and weight loss in diet-induced obese mice while modulating gut microbiota composition.

(3) Myoblast Differentiation Research: In the C2C12 myoblast model, NNMTi is being investigated to elucidate mechanisms promoting myocyte differentiation and myotube formation.

(4) Antitumor Potential Research: Some studies indicate NNMTi possesses potential antitumor activity.