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Apoptosis

, Volume 13, Issue 3, pp 343–353 | Cite as

MAP kinase pathways in UV-induced apoptosis of retinal pigment epithelium ARPE19 cells

  • Raphaël Roduit
  • Daniel F. Schorderet
Original Paper

Abstract

The retinal pigment epithelium (RPE) is constantly exposed to external injuries which lead to degeneration, dysfunction or loss of RPE cells. The balance between RPE cells death and proliferation may be responsible for several diseases of the underlying retina, including age-related macular degeneration (AMD) and proliferative vitreoretinopathy (PVR). Signaling pathways able to control cells proliferation or death usually involve the MAPK (mitogen-activated protein kinases) pathways, which modulate the activity of transcription factors by phosphorylation. UV exposure induces DNA breakdown and causes cellular damage through the production of reactive oxygen species (ROS) leading to programmed cell death. In this study, human retinal pigment epithelial cells ARPE19 were exposed to 100 J/m2 of UV-C and MAPK pathways were studied. We first showed the expression of the three major MAPK pathways. Then we showed that activator protein-1 (AP-1) was activated through phosphorylation of cJun and cFos, induced by JNK and p38, respectively. Specific inhibitors of both kinases decreased their respective activities and phosphorylation of their nuclear targets (cJun and cFos) and reduced UV-induced cell death. The use of specific kinases inhibitors may provide excellent tools to prevent RPE apoptosis specifically in RPE diseases involving ROS and other stress-related compounds such as in AMD.

Keywords

Retinal pigment epithelium cells Apoptosis MAP kinases Ultra violet AP-1 Kinases inhibitors 

Notes

Acknowledgments

We thank Aurélie Despont, Martine Emery and Loriane Moret for technical help. We thank Dr. Sandra Cottet and Dr. Pascal Escher for critical comments and helpful discussion.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.IRO, Institut de Recherche en OphtalmologieSionSwitzerland
  2. 2.Department of OphthalmologyUniversity of LausanneLausanneSwitzerland
  3. 3.EPFL, Ecole Polytechnique Fédérale de LausanneLausanneSwitzerland

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