Effects of low concentrations of cis- and trans-urocanic acid on cytokine elaboration by keratinocytes

被引:16
作者
Redondo, P
GarciaFoncillas, J
Cuevillas, F
Espana, A
Quintanilla, E
机构
[1] Department of Dermatology, University Clinic of Navarra, School of Medicine, Pamplona
[2] Department of Oncology, University Clinic of Navarra, School of Medicine, Pamplona
[3] Department of Dermatology, University Clinic of Navarra, 31080 Pamplona
关键词
urocanic acid; cytokines; keratinocytes; phorbol esters;
D O I
10.1111/j.1600-0781.1996.tb00211.x
中图分类号
R75 [皮肤病学与性病学];
学科分类号
100206 ;
摘要
The urocanic acid cis isomer (cis-UCA) is a possible cutaneous photoreceptor for the immunomodulatory phenomena that follow ultraviolet B irradiation. Several experiments in animals show an inhibitory action of cis-UCA on cellular immunity. However, the action of cis-UCA on the synthesis of cytokines in keratinocytes remains unknown. Long-term cultures of normal human keratinocytes were prepared in a serum-free medium, and stimulated with 1 mu g/ml of phorbol 12-myristate 13-acetate (TPA) and UCA or UVB-UCA (10-100 mu g/ml). Synthesis of the following cytokines was measured using ELISA and Northern blot techniques: TNF-alpha, IL-1 alpha, IL-1 beta, IL-6, IL-8 and TGF-beta 1. TPA increased TNF-alpha protein levels in culture supernatants. No changes in IL-1 alpha and IL-1 beta protein levels were detected in basal culture supernatant after TPA stimulus. TPA augmented RNA expression for TNF-alpha, IL-1 alpha, IL-1 beta and TGF-beta 1. UCA isomers did not induce cytokine changes in protein synthesis. Expression of IL-1 alpha and IL-1 beta genes was increased after exposure to 100 mu g/ml UVB-UCA (70 mu g/ml cis-UCA). A slight increase in TNF-alpha RNA expression was detected when the dose of UVB-UCA reached 100 mu g/ml. No effects on cytokine synthesis were found after UCA stimulus. These results suggest that low doses of cis-UCA do not effect cytokine synthesis by keratinocytes.
引用
收藏
页码:237 / 243
页数:7
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