Plasma homocysteine and folate levels in patients with chronic plaque psoriasis.
BACKGROUND
Hyperhomocysteinaemia is a well-known risk factor for cardiovascular diseases. Patients with severe chronic plaque psoriasis have a higher risk of death due to arterial and/or venous thrombosis.


OBJECTIVE
To investigate the relationship among plasma homocysteine and folate levels and severity of chronic plaque psoriasis in a selected cohort of patients with psoriasis without known risk factors for acquired hyperhomocysteinaemia.


METHODS
We performed a case-control study in 40 patients with chronic plaque psoriasis and 30 age- and sex-matched healthy controls. Cases and controls were selected excluding individuals with conditions or diseases associated with acquired hyperhomocysteinaemia, and were also asked to stop alcohol and coffee consumption for 1 week before blood sampling. The plasma levels of homocysteine and folic acid were measured and were correlated with the severity of psoriasis (Psoriasis Area and Severity Index, PASI).


RESULTS
Patients with psoriasis had plasma homocysteine levels higher than controls (mean +/- SD 16.0 +/- 5.6 vs. 10.4 +/- 4.7 micro mol L(-1); P < 0.001). Conversely, folic acid levels were lower in patients with psoriasis compared with controls (mean +/- SD 3.6 +/- 1.7 vs. 6.5 +/- 1.7 nmol L(-1); P < 0.001). Plasma homocysteine levels in patients with psoriasis correlated directly with disease severity (PASI) and inversely with folic acid levels. Plasma folic acid levels were inversely correlated with the PASI. No abnormalities of plasma vitamin B(6) and B(12) were found.


CONCLUSIONS
Patients with psoriasis may have a tendency to hyperhomocysteinaemia, which may predispose to higher cardiovascular risk. Dietary modification of this risk factor appears relevant to the global management of patients with moderate to severe psoriasis.
Malerba
M
M
Department of Internal Medicine, First Medical Division, University of Brescia, Spedali Civili, Brescia, Italy. malerba@med.unibs.it
Gisondi
P
P
Radaeli
A
A
Sala
R
R
Calzavara Pinton
P G
PG
Girolomoni
G
G
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D002908:Chronic Disease; D015331:Cohort Studies; D005260:Female; D005492:Folic Acid / Q000097:blood*; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D020138:Hyperhomocysteinemia / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D011565:Psoriasis / Q000097:blood* / Q000150:complications / Q000175:diagnosis
D006710:Homocysteine; D005492:Folic Acid