Which nonessential amino acids become conditionally essential in AKI?

• A. Tyrosine, Arginine, Glutamine
• B. Cysteine, Methionine, Tryptophan
• C. Glycine, Proline, Serine
• D. Leucine, Isoleucine, Valine

Answer: (A)

When the body is in acute kidney injury, metabolism shifts toward a pronounced catabolic state with inflammation, so some amino acids that are normally produced in sufficient amounts become required in larger amounts from the diet. Arginine becomes essential because impaired kidney function can disrupt endogenous production and arginine is a key precursor for nitric oxide and other immune and vascular functions; supplying it helps support healing and immune response when synthesis is not meeting demand. Glutamine is another conditionally essential one in critical illness and organ injury because it fuels rapidly dividing cells in the gut and immune system, and its endogenous supply can lag behind the heightened needs during AKI. Tyrosine also becomes essential under these stress conditions because conversion from phenylalanine to tyrosine can be limited, and tyrosine is necessary for protein synthesis and the production of important neurotransmitters and hormones. The other listed amino acids either remain nonessential in this context or are essential under normal circumstances, not specifically driven by AKI.