Sapropterin is a naturally occurring essential cofactor of the three aromatic amino acid hydroxylase enzymes, used in the degradation of amino acid phenylalanine and in the biosynthesis of dopamine, epinephrine, melatonin, norepinephrine, neurotransmitter
SPR inhibitor 3 is an effective sepiapterin reductase inhibitor. SPR inhibitor 3 decreases neuropathic and inflammatory pain through a reduction of BH4 levels. SPR inhibitor 3 shows a high binding affinity to human SPR in a cell-free assay (IC50=74 nM) an
L-Sepiapterin, also known as Sepiapterin, is a precursor compound crucial for the production of tetrahydrobiopterin (BH4), which serves as a coenzyme for endothelial nitric oxide synthase (eNOS). This compound demonstrates its efficacy by improving endothelial dysfunction in small mesenteric arteries from db db mice and promoting angiogenesis. Moreover, L-Sepiapterin exerts inhibitory effects on cellular proliferation and migration in ovarian cancer cells through the down-regulation of p70S6K-dependent vascular endothelial growth factor receptor-2 (VEGFR-2) expression[1][2].