Abstract:
BACKGROUND:The use of Isotretinoin (Iso) for cystic acne (CA) therapy includes marked side-effects such as dyslipidemia, increased liver enzymes, and reduction of biotinidase activity. Moreover, Homocysteine (Hcy), an amino acid, is metabolized in the liver requiring folate, vitamin B6, vitamin B12, and the activity of enzymes, i.e. cystathionine-beta-synthase. Increased blood levels of Hcy are associated with premature occlusive vascular disease. OBJECTIVE:The aim of this study was the evaluation of Hcy levels and the responsible vitamins for its metabolism in patients with CA on Iso treatment. METHODS AND RESULTS:Twenty-eight patients with CA were submitted to laboratory examinations before (Value 1) and after (Value 2) 45 days on Iso (0.5 mg/kg/24 h) therapy. Blood levels of Hcy and vitamin B6 were evaluated by HPLC methods, and folate and vitamin B12 using a commercial Kit. Hcy levels (Value 1 = 7.86 +/- 1.6 micromol/L; Value 2 = 13.65 +/- 3.3 micromol/L; P < 0.001) were statistically significantly increased in patients on treatment. Vitamins were unaltered, and lipids and liver enzymes increased. Significant correlation between Hcy levels, vitamins, and liver enzymes was found. Methionine loading tests performed in nine patient-volunteers showed an abnormal response post-treatment. CONCLUSIONS:It is suggested that the elevated Hcy levels in patients after 45 days on Iso therapy could be due either to the 'inhibition' of cystathionine-beta-synthase by the drug and/or their liver dysfunction. Daily vitamin supplementation along with frequent evaluations of Hcy blood levels are recommended for the prevention of a premature occlusive vascular disease.
journal_name
Int J Dermatoljournal_title
International journal of dermatologyauthors
Schulpis KH,Karikas GA,Georgala S,Michas T,Tsakiris Sdoi
10.1046/j.1365-4362.2001.00146.xsubject
Has Abstractpub_date
2001-01-01 00:00:00pages
33-6issue
1eissn
0011-9059issn
1365-4632pii
ijd146journal_volume
40pub_type
临床试验,杂志文章abstract::A 40-year-old black man who was HIV positive developed generalized hypertrophic lichen planus in areas previously affected by a photosensitivity eruption. After unsuccessful attempts to induce remission of his lichen planus with conventional therapies, etretinate produced a dramatic response. ...
journal_title:International journal of dermatology
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