Journal
JOURNAL OF DERMATOLOGICAL TREATMENT
Volume 18, Issue 3, Pages 138-146Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09546630701247930
Keywords
cardiovascular diseases; folic acid; hyperhomocysteinemia; psoriasis
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Folic acid is a vitamin B essential for the integrity and function of DNA. Relative deficiency of folic acid may occur in conditions such as pregnancy and hyperproliferative or chronic inflammatory disorders. Folic acid supplementation has been proven to be beneficial in the prevention of neural tube defects and in limiting methotrexate side effects, and may reduce the risk of colorectal cancer. Folate is a critical vitamin in determining plasma homocysteine levels, which in turn is a major risk factor for cardiovascular diseases. The results of large clinical trials with dietary supplementation of folic acid, vitamin B12 and vitamin B6 have shown that this homocysteine-lowering therapy is effective in the secondary prevention of non-fatal strokes, but had no effect in the prevention of fatal cardiovascular diseases. Hyperhomocysteinemia has also been reported in age-related neurological conditions with cognitive impairment (e.g. dementia), and psychiatric disorders such as depression. Elevated homocysteine levels are frequent in patients with chronic immune-mediated disorders including rheumatoid arthritis, systemic lupus erythematosus, chronic plaque psoriasis and psoriatic arthritis, which have in common a tendency to an accelerated atherosclerosis leading to increased deaths from cardiovascular events. Folic acid supplementation appears as a reasonable therapeutic option in patients affected by chronic inflammatory skin diseases, such as moderate to severe psoriasis; in particular, those with concomitant hyperhomocysteinemia, low plasma folate and additional cardiovascular risk factors.
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