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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
6
|
| pubmed:dateCreated |
1992-1-23
|
| pubmed:abstractText |
Suction blister roofs taken from the involved and uninvolved epidermis of patients with vitiligo showed a consistent reduction in levels of catalase compared to normal healthy controls of matched photo-skin types (Fitzpatrick classification). A decrease in catalase activity is expected to increase the concentration of hydrogen peroxide in the epidermis of these patients. Hydrogen peroxide functions as a reversible inhibitor of human tyrosinase with a KI of 8 X 10(-6) M. Also, hydrogen peroxide undergoes photochemical reduction yielding highly reactive hydroxyl radicals (OH.) and hydroxyl ions (OH-) mainly by the Haber-Weiss reaction. Hydroxyl radicals are capable of bleaching constitutional melanin and cause membrane lysis through lipid peroxidation reactions. Hydroxyl ions increase the pH in the epidermis, and as a consequence glutathione reductase activity is increased in patients with vitiligo compared to controls. Based on these new results, together with the previously reported calcium transport defect, a new hypothesis has been formulated for the pathogenesis of vitiligo.
|
| pubmed:commentsCorrections | |
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:month |
Dec
|
| pubmed:issn |
0022-202X
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
97
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
1081-5
|
| pubmed:dateRevised |
2007-11-15
|
| pubmed:meshHeading | |
| pubmed:year |
1991
|
| pubmed:articleTitle |
Low catalase levels in the epidermis of patients with vitiligo.
|
| pubmed:affiliation |
Department of Dermatology, University of Hamburg, Germany.
|
| pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
|