Biomarkers of Folate and Vitamin B12 Are Related in ... - CiteSeerX
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Biomarkers of Folate and Vitamin B12 Are Related in ... - CiteSeerX
Background: B-vitamins (folate, B12) are important mi- cronutrients for brain function and essential cofactors for homocysteine (HCY) metabolism. Increased ...
Clinical Chemistry 53:2 326 –333 (2007)
General Clinical Chemistry
Biomarkers of Folate and Vitamin B12 Are Related in Blood and Cerebrospinal Fluid Rima Obeid,1 Panagiotis Kostopoulos,2 Jean-Pierre Knapp,1 Mariz Kasoha,1 George Becker,2† Klaus Fassbender,2 and Wolfgang Herrmann1* Background: B-vitamins (folate, B12) are important micronutrients for brain function and essential cofactors for homocysteine (HCY) metabolism. Increased HCY has been related to neurological and psychiatric disorders. We studied the role of the B-vitamins in HCY metabolism in the brain. Methods: We studied blood and cerebrospinal fluid (CSF) samples from 72 patients who underwent lumbar puncture. We measured HCY, methylmalonic acid (MMA), and cystathionine by gas chromatography-mass spectrometry; S-adenosylmethionine (SAM) and S-adenosylhomocysteine (SAH) by liquid chromatographytandem mass spectrometry; and the B-vitamins by HPLC or immunoassays. Results: Concentrations were lower in CSF than serum or plasma for HCY (0.09 vs 9.4 mol/L), SAH (13.2 vs 16.8 nmol/L), cystathionine (54 vs 329 nmol/L), and holotranscobalamin (16 vs 63 pmol/L), whereas concentrations in CSF were higher for MMA (359 vs 186 nmol/L) and SAM (270 vs 113 nmol/L; all P
