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Eicosanoid release in polymorphous light eruption: selective UV-A-induced LTB4 generation by peripheral blood
1Department of Dermatology, University of Munich, FRG.
Skin Pharmacology : the Official Journal of the Skin Pharmacology Society
|January 1, 1988
Summary
Polymorphous light eruption (PLE) involves UV-A-induced skin inflammation. Studies show UV-A exposure triggers significant leukotriene B4 (LTB4) release from PLE patient cells, suggesting its role in the condition.
Area of Science:
- Dermatology
- Immunology
- Biochemistry
Background:
- The biochemical mechanisms underlying ultraviolet (UV)-induced skin inflammation in polymorphous light eruption (PLE) remain unclear.
- Eicosanoids, derived from arachidonic acid, are potential mediators of inflammatory processes.
Purpose of the Study:
- To investigate the role of eicosanoids in mediating UV-induced cutaneous inflammation in patients with PLE.
- To determine if specific UV wavelengths trigger eicosanoid release in PLE.
Main Methods:
- Studied 13 patients with experimentally reproducible PLE skin lesions induced by UV-A.
- Irradiated peripheral blood leukocytes from PLE patients and healthy controls with UV-A or UV-B.
- Measured the release of leukotriene B4 (LTB4), leukotriene C4 (LTC4), and prostaglandin E2 (PGE2).
Main Results:
- Leukocytes from PLE patients selectively released high amounts of LTB4 in response to UV-A irradiation, unlike healthy controls.
- The UV-A-induced LTB4 release was dependent on the light dose.
- UV-B irradiation did not induce a similar selective release of LTB4.
Conclusions:
- Selective UV-A-induced release of LTB4 by leukocytes may play a significant role in the pathophysiology of cutaneous inflammation in PLE.
- Eicosanoids, particularly LTB4, are implicated as key mediators in UV-A-sensitive photodermatoses.