DL-Citrulline

DL-Citrulline (CAS No.: 627-77-0) is a small molecule amino acid metabolite category research reagent, corresponding to citrulline as an endogenous intermediate of nitrogen handling metabolism, and is widely studied in biochemical and translational life sciences as a non proteinogenic amino acid linked to hepatic and extrahepatic arginine related networks; in biomedical research contexts, its primary functional background is centered on participation in the urea cycle and the citrulline arginine nitric oxide axis, where it is associated with enzymatic conversion steps involving nitric oxide synthase and argininosuccinate pathway enzymes and with broader regulation of cellular nitrogen flux, ammonia detoxification biology, and metabolic homeostasis signaling, while current evidence supports pathway level mechanism characterization rather than classical single high affinity receptor pharmacology, with reported in vitro effects generally described at millimolar to high micromolar concentrations in cell based metabolism, endothelial function, and immune microenvironment studies depending on matrix composition and model system sensitivity; accordingly, DL-Citrulline is commonly applied as a tool compound in cell culture and preclinical animal model workflows to probe amino acid transport and recycling, metabolic stress responses, arginine availability constraints, and pathway perturbation in liver biology, cardiovascular biology, and inflammation associated experimental settings, and in drug discovery programs it is typically used as a comparator or pathway modulation component in metabolite focused screening and mechanism of action deconvolution, where the concentrations or doses used in experiments typically depend on specific experimental designs and research objectives.