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Papers In Press, published online ahead of print July 6, 2000
Division of Biochemical Toxicology, National Center for Toxicological Research, Jefferson, AR 72079
Corresponding Author: jjames{at}nctr.fda.gov
S-adenosylmethionine (SAM) and S-adenosylhomocysteine (SAH), as the substrate and product of essential cellular methyltransferase reactions, are important metabolic indicators of cellular methylation status. Chronic elevation of SAH, secondary to the homocysteine-mediated reversal of the SAH hydrolase reaction, reduces methylation of DNA, RNA, proteins, and phospholipids. High affinity binding of SAH to the active site of cellular methyltransferases results in product inhibition of the enzyme. Using a sensitive new HPLC method with coulometric electrochemical detection, plasma SAH levels in healthy young women were found to increase linearly with mild elevation in homocysteine levels (r=0.73; p < 0.001); however, SAM levels were not affected. Plasma SAH levels were positively correlated with intracellular lymphocyte SAH levels (r=0.81; p < 0.001) and also with lymphocyte DNA hypomethylation (r=0.74, p < 0.001). Further, the increase in plasma SAH was negatively associated with plasma pyridoxal 5?phosphate levels (p< 0.01). These results suggest that chronic elevation in plasma homocysteine levels, such as those associated with nutritional deficiencies or genetic polymorphisms in the folate pathway, may have an indirect and negative effect on cellular methylation reactions through a concomitant increase in intracellular SAH levels.
J. Biol. Chem, 10.1074/jbc.M002725200
Submitted on March 31, 2000
Revised on May 29, 2000
Accepted on July 5, 2000
Increase in plasma homocysteine associated with parallel increases in plasma S-adenosylhomocyteine and lymphocyte DNA hypomethylation
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