1
|
Fazekas B, Polyánka H, Bebes A, Tax G, Szabó K, Farkas K, Kinyó A, Nagy F, Kemény L, Széll M, Ádám É. UVB-dependent changes in the expression of fast-responding early genes is modulated by huCOP1 in keratinocytes. J Photochem Photobiol B 2014; 140:215-22. [PMID: 25169772 DOI: 10.1016/j.jphotobiol.2014.08.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 07/23/2014] [Accepted: 08/01/2014] [Indexed: 10/24/2022]
Abstract
Ultraviolet (UV) B is the most prominent physical carcinogen in the environment leading to the development of various skin cancers. We have previously demonstrated that the human ortholog of the Arabidopsis thaliana constitutive photomorphogenesis 1 (COP1) protein, huCOP1, is expressed in keratinocytes in a UVB-regulated manner and is a negative regulator of p53 as a posttranslational modifier. However, it was not known whether huCOP1 plays a role in mediating the UVB-induced early transcriptional responses of human keratinocytes. In this study, we report that stable siRNA-mediated silencing of huCOP1 affects the UVB response of several genes within 2 h of irradiation, indicating that altered huCOP1 expression sensitizes the cells toward UVB. Pathway analysis identified a molecular network in which 13 of the 30 examined UVB-regulated genes were organized around three central proteins. Since the expression of the investigated genes was upregulated by UVB in the siCOP1 cell line, we hypothesize that huCOP1 is a repressor of the identified pathway. Several members of the network have been implicated previously in the pathogenesis of non-melanoma skin cancers; therefore, clarifying the role of huCOP1 in these skin diseases may have clinical relevance in the future.
Collapse
Affiliation(s)
- B Fazekas
- Department of Dermatology and Allergology, Faculty of Medicine, University of Szeged, Szeged, Hungary.
| | - H Polyánka
- MTA-SZTE Dermatological Research Group, University of Szeged, Szeged, Hungary
| | - A Bebes
- Department of Dermatology and Allergology, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - G Tax
- Department of Dermatology and Allergology, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - K Szabó
- MTA-SZTE Dermatological Research Group, University of Szeged, Szeged, Hungary
| | - K Farkas
- MTA-SZTE Dermatological Research Group, University of Szeged, Szeged, Hungary
| | - A Kinyó
- Department of Dermatology and Allergology, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - F Nagy
- Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - L Kemény
- Department of Dermatology and Allergology, Faculty of Medicine, University of Szeged, Szeged, Hungary; MTA-SZTE Dermatological Research Group, University of Szeged, Szeged, Hungary
| | - M Széll
- MTA-SZTE Dermatological Research Group, University of Szeged, Szeged, Hungary; Institute of Medical Genetics, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - É Ádám
- Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| |
Collapse
|