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Folate and vitamin B12 reduce disabling schizophrenia symptoms in some patients
Date:3/6/2013

gned specifically to investigate whether supplementation with folate and B12 which can magnify the effects of folate reduced negative symptoms of schizophrenia. A 2011 pilot study found symptom improvement only among patients carrying a variant in a folate-pathway gene called MTHFR that reduced the gene's activity. To get a clearer picture of folate's effect on negative symptoms, the current study enrolled 140 patients with schizophrenia at community mental health centers in Boston, Rochester, N.Y., and Grand Rapids, Mich.

Participants were all taking antipsychotic medications which have been shown to alleviate positive symptoms, such as hallucinations and delusions, but not negative symptoms and were randomized to receive daily doses of either folate and vitamin B12 or a placebo for 16 weeks. Every two weeks their medical and psychiatric status was evaluated, using standard symptom assessment tools along with measurements of blood levels of folate and homocysteine, an amino acid that tends to rise when folate levels drop. Nutritional information was compiled to account for differences in dietary intake of the nutrients. Participants' blood samples were analyzed to determine the variants they carried of MTHFR and three other folate-pathway genes previously associated with the severity of negative symptoms of schizophrenia.

Among all 140 participants in the study protocol, those receiving folate and vitamin B12 showed improvement in negative symptoms, but the degree of improvement was not statistically significant compared with the placebo group. But when the analysis accounted for the variants in the genes of interest, intake of the two nutrients did provide significant improvement in negative symptoms, chiefly reflecting the effects of specific variants in MTHFR and in a gene called FOLH1. Variants in the other two genes studied did not appear to have an effect on treatment outcome.

While a low-functioning variant in FOLH1 had been
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Contact: Kristen Stanton
kstanton3@partners.org
617-643-3907
Massachusetts General Hospital
Source:Eurekalert

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