5-Lipoxygenase activation in psoriasis: a dead issue?

Abstract

It has been suggested in the literature that 5-lipoxygenase activation may be an important pathological event in psoriasis and that 5-lipoxygenase inhibitors may thus have some beneficial therapeutic effect in this disease. This is because (1) neutrophil activation is a prominent feature of the disease, (2) leukotriene B4 is a potent chemotactic agent for neutrophils and is present in psoriatic lesions, (3) 5-lipoxygenase is present in human epidermis, (4) inhibition of 5-lipoxygenase may affect the disease. These concepts are questioned, and in particular it is suggested that (1) the leukotriene B4-like material found in psoriatic skin has never been shown to have the correct stereochemistry to indicate that it is 5-lipoxygenase derived, (2) there is no convincing evidence for the presence of the 5-lipoxygenase enzyme in human skin, (3) drugs purported to have some benefit in psoriasis through 5-lipoxygenase inhibitory mechanisms act through other mechanisms and (4) selective leukotriene biosynthesis inhibitors have no therapeutic utility in psoriasis. It is concluded that 5-lipoxygenase activation does not play a significant role in the pathology of psoriasis and therefore selective leukotriene biosynthesis inhibitors would have no significant role in the treatment of this disease.

• Authors: A W Ford-Hutchinson
• Journal: Skin pharmacology : the official journal of the Skin Pharmacology Society (Skin Pharmacol) Vol. 6 Issue 4 Pg. 292-7 ( 1993) ISSN: 1011-0283 [Print] Switzerland
• PMID: 8198815 (Publication Type: Journal Article, Review)

Chemical References

• Leukotriene Antagonists
• Leukotriene B4
• Arachidonate 5-Lipoxygenase

Topics

• Arachidonate 5-Lipoxygenase (physiology)
• Cell Movement (drug effects)
• Epidermis (enzymology)
• Humans
• Leukotriene Antagonists
• Leukotriene B4 (physiology)
• Neutrophils (drug effects)
• Psoriasis (drug therapy, enzymology, pathology)