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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Peter, Marcus E. Chang, Qing Grassi, Michael A. |
| Description | Country affiliation: United States Author Affiliation: Chang Q ( Department of Ophthalmology & Visual Sciences, University of Illinois at Chicago, Chicago, Illinois, USA.) |
| Abstract | PURPOSE: We investigated the function of Fas in photoreceptors. METHODS: Postmortem human eyes and mouse-derived photoreceptor cells (661W) were examined for Fas expression by in situ hybridization and immunofluorescence. 661W cells were treated with FasL or Fas agonistic antibody, or exposed to light with/without pharmacological manipulation of Fas signaling, followed by apoptosis detection by TUNEL, immunofluorescence and fluorescence activated cell scanning (FACS). Fractionated cellular extracts were used to detect protein expression or protein phosphorylation after immunoprecipitation by Western blot. RESULTS: Fas was expressed in the photoreceptor layer of human retina. Fas and a cleaved form of FasL were found on the cell surface of 661W cells. Treatment with FasL or Fas agonistic antibody induced apoptosis in 661W cells. Blocking the activity of FasL or administration of caspase-8 inhibitor z-IETD inhibited light-induced apoptosis. However, it simultaneously caused induction of necroptosis, which could be blocked by the receptor-interacting protein 1 (RIP1) inhibitor, necrostatin-1. Light exposure in the presence of z-IETD caused hyper-phosphorylation of RIP1. Light exposure did not elevate the expression of Fas, FasL, or the Fas-associated death domain adaptor protein (FADD). Cells or conditioned medium after light exposure induced apoptosis in dark-adapted cells, which could be attenuated by blockade of Fas. CONCLUSIONS: Fas has a pro-apoptotic role in photoreceptors. Under light stress, soluble and membrane-bound FasL can bind to Fas, inducing apoptosis via a paracrine mechanism. Although blocking Fas signaling inhibits apoptosis, it does not improve the overall photoreceptor survival due to a compensatory activation of necroptosis. Hence, prevention of photoreceptor loss from retinal photo-oxidative stress should target Fas and RIP1. |
| ISSN | 01460404 |
| e-ISSN | 15525783 |
| DOI | 10.1167/iovs.11-8928 |
| Journal | Investigative Opthalmology & Visual Science |
| Issue Number | 7 |
| Volume Number | 53 |
| Language | English |
| Publisher | Association for Research in Vision and Ophthalmology |
| Publisher Date | 2012-06-20 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antigens, Cd95 Physiology Apoptosis Fas Ligand Protein Metabolism Adverse Effects Photoreceptor Cells Drug Effects Animals Blotting, Western Caspase Inhibitors Cysteine Proteinase Inhibitors Pharmacology Imidazoles Immunoprecipitation In Situ Nick-end Labeling Indoles Mice Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't Discipline Ophthalmology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ophthalmology Sensory Systems Cellular and Molecular Neuroscience |
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