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Effects of endogenous L-cystathionine on enzymatic assays of serum homocysteine in samples from renal dialysis patients
Homocysteine (Hcy) is a thiol-containing amino acid produced by the intracellular demethylation of methionine.Approximately 80% of circulating Hcy in the blood is protein bound by disulfide linkage.The remaining unbound Hcy combines by oxidation either with itself to form the dimer homocystine or with cysteine to form the mixed disulfide cysteine-Hcy.Only a small amount circulates as free Hcy.Total homocysteine (tHcy) represents the sum of all forms of Hcy including forms of oxidized,protein bound and free.