6-Formylpterin

6-Formylpterin (CAS No.: 712-30-1) is an oxidized pterin derivative generated through the photolytic degradation of folic acid and is widely utilized as a biochemical tool in redox biology and enzyme modulation studies. It functions as a potent inhibitor of xanthine oxidase, binding with high affinity to one of the enzyme’s active sites and exerting hetero-substrate inhibition that disrupts substrate turnover, typically observed in the nanomolar to low micromolar range. In addition to enzyme inhibition, 6-Formylpterin is metabolized by xanthine oxidase to yield reactive oxygen species, particularly hydrogen peroxide, thereby acting as an intracellular pro-oxidant that alters cellular redox homeostasis. This dual activity contributes to its ability to induce oxidative stress, promote reactive oxygen species accumulation, and trigger apoptosis in leukemia cell models such as HL-60, while also suppressing proliferation in pancreatic cancer cell lines including PanC-1. Through these mechanisms, it serves as a valuable probe for investigating oxidative stress-mediated signaling pathways, apoptosis regulation, and metabolic enzyme function, and is commonly applied in cell-based assays and early-stage anticancer compound screening, with experimental concentrations varying depending on the specific biological context and study design.