L-Asparagine

L-Asparagine (CAS No.: 70-47-3) is a non-essential amino acid that plays a critical role in cellular metabolism and the regulation of protein biosynthesis, particularly in neural and rapidly proliferating cells. Endogenously synthesized from aspartic acid and glutamine via asparagine synthetase, it serves as a key metabolic intermediate and nitrogen reservoir, while also participating in the maintenance of amino acid homeostasis and cellular signaling processes. L-Asparagine is notably essential for the survival and proliferation of certain leukemic cells, which often exhibit low expression of asparagine synthetase and thus depend on extracellular sources; this metabolic vulnerability underlies the therapeutic mechanism of L-asparaginase, an enzyme that depletes circulating asparagine and glutamine, leading to inhibition of RNA and DNA synthesis and induction of apoptosis in susceptible lymphoblasts. In cancer research, L-asparagine is widely used to investigate amino acid dependency, metabolic reprogramming, and resistance mechanisms, and it has also been explored as a biomarker in studies of acute lymphoblastic leukemia. In vitro studies indicate that supplementation with L-asparagine at low millimolar concentrations can restore proliferation in cells with suppressed asparagine synthetase activity, highlighting its role in supporting tumor cell growth. Additionally, it is utilized in cell culture systems, metabolic flux analyses, and drug screening assays targeting amino acid metabolism, with experimental concentrations tailored to specific model systems and study objectives.