title: Reciprocal regulation of 12- and 15-lipoxygenases by UV-irradiation in human keratinocytes.
abstract: The 12/15-lipoxygenase (12/15-LOX) pathways of arachidonate metabolism have been implicated in the pathogenesis of psoriasis. Since UV photo-therapy is a commonly used technique for inhibiting cell proliferation and inflammation in skin diseases, we hypothesized that UV-irradiation may affect 12/15-LOX expression which might regulate cell proliferation. In this study, we showed that UV-irradiation suppressed 12-LOX expression, whereas up-regulated 15-LOX expression. Treatment with the 15-LOX metabolites sufficiently suppressed insulin-like growth factor II-induced 12-LOX expression and blocked cell cycle progression. On the basis of our findings, we think that the 15-LOX metabolites may inhibit epidermal hyperplasia in psoriasis by regulating 12-LOX expression.
authors.affiliation: Laboratory of Dermato-Immunology, Catholic Research Institute of Medical Science, College of Medicine, The Catholic University of Korea, 505 Banpo-dong, Seocho-gu, Seoul 137-040, South Korea.
authors.forename: Hyun
authors.initials: H
authors.lastname: Yoo
authors.forename: Byeongwook
authors.initials: B
authors.lastname: Jeon
authors.forename: Myung-Shin
authors.initials: MS
authors.lastname: Jeon
authors.forename: Hyangkyu
authors.initials: H
authors.lastname: Lee
authors.forename: Tae-Yoon
authors.initials: TY
authors.lastname: Kim