title: Homocysteine: a marker for cognitive performance? A longitudinal follow-up study.
abstract: The present prospective study investigated whether elevated total serum homocysteine concentration is a risk factor for cognitive decline. The outcomes were compared to the possible relation between cognition and vitamin B12 or folic acid. Cognitive performance of 144 normal aging individuals (aged 30-80 years) was tested at baseline and after six years of follow-up. Domains of cognitive function addressed were cognitive speed (Letter-Digit Coding test), attention and information processing (Stroop test) and verbal learning and memory (Word Learning Test Total; Delayed Recall). Serum concentrations of homocysteine, folic acid and vitamin B12 were determined. Serum concentrations of homocysteine correlated negatively with cognitive performance on the Word Learning tests at baseline, independent of age, sex, education level or folic acid concentration. Homocysteine concentration at baseline correlated negatively with cognitive performance on the Stroop and Word Learning tests during the whole six-year follow-up period. The folic acid concentration correlated to the Delayed Recall test at baseline only and no correlations were observed for vitamin B12. Thus, while a relation between vitamin B12 or folic acid and cognition was almost absent, elevated homocysteine concentrations were associated with prolonged lower cognitive performance in this normal aging population.
authors.affiliation: European Graduate School of Neuroscience (Euron), Universiteit Maastricht, The Netherlands. c.teunissen.cell@med.vu.nl
authors.forename: C E
authors.initials: CE
authors.lastname: Teunissen
authors.forename: A Henk J
authors.initials: AH
authors.lastname: Blom
authors.forename: M P J
authors.initials: MP
authors.lastname: Van Boxtel
authors.forename: H
authors.initials: H
authors.lastname: Bosma
authors.forename: C
authors.initials: C
authors.lastname: de Bruijn
authors.forename: J
authors.initials: J
authors.lastname: Jolles
authors.forename: B A
authors.initials: BA
authors.lastname: Wauters
authors.forename: H W M
authors.initials: HW
authors.lastname: Steinbusch
authors.forename: J
authors.initials: J
authors.lastname: de Vente
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000097:blood / Q000502:physiology / Q000523:psychology; D015415:Biomarkers / Q000097:blood; D003071:Cognition / Q000502:physiology*; D003072:Cognition Disorders / Q000097:blood* / Q000175:diagnosis; D005260:Female; D005492:Folic Acid / Q000097:blood; D005500:Follow-Up Studies; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D011446:Prospective Studies; D011597:Psychomotor Performance; D012307:Risk Factors; D014805:Vitamin B 12 / Q000097:blood
chemical_list: D015415:Biomarkers; D006710:Homocysteine; D005492:Folic Acid; D014805:Vitamin B 12