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Ординатура / Офтальмология / Английские материалы / Retinal Degenerative Diseases Laboratory and Therapeutic Investigations_Anderson_2008.pdf
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C. Lange et al.

the duration of exposure, more or less photoreceptors die and are cleared from the subretinal space until 10 days post exposure. The rd1 (retinal degeneration 1) mouse is a model for autosomal recessive RP. It carries a null mutation in the β-subunit of the cGMP-phosphodiesterase. Lack of cGMP-phosphodiesterase activity leads to accumulation of cGMP and Ca2+ in the outer segment of rod-photoreceptors (Bowes et al. 1990). In this model, photoreceptors start to die around postnatal day (PND) 10 with nearly no photoreceptors left at PND 21. Although photoreceptors die by an apoptotic process in both models, it is not yet clear how induced models compare to inherited models for retinal degeneration. Understanding the cell death mechanisms that these models share or in which they are different is important in order to develop treatment strategies, which aim at the inhibition of cell death mechanisms or at the activation of cell survival strategies.

Gene expression analysis in mouse retinas has shown that the expression of different genes of the Janus kinase/Signal Transducer and Activator of Transcription (Jak/STAT) signaling pathway changes during retinal degeneration after light exposure and in the rd1 mouse (Samardzija et al. 2006). This points to an important role of individual members of this pathway for cell death or cell survival in injured retinas.

Here we investigated additional genes from the Jak/STAT pathway and analyzed their potential involvement in the induced (light) and the inherited (rd1) model for retinal degeneration.

69.2 Materials and Methods

69.2.1 Mice and Light Exposure

Animals were treated in accordance with the regulations of the Veterinary Authority of Zurich and with the statement of ‘The Association for Research in Vision and Ophthalmology’ for the use of animals in research. About 6- to 8-week old Balb/c mice (from Harlan) were dark adapted over night (16h) and exposed to white fluorescent light (5,000 lux) for 1 h. After light exposure mice were kept in darkness for different periods of time before sacrifice and removal of the retina. After 24 h in darkness they were returned to cyclic (12 h: 12 h) light. Mice that were dark-adapted but not exposed to light served as controls. Rd1 mice (Harlan) were sacrificed at different ages (PND10 to PND37) for removal of the retina. Here, wild-type Bl/6 mice (from a breeding colony in the animal facility of the University Hospital Zurich) served as controls for normalization.

69.2.2Semi-Quantitative Real Time Polymerase Chain Reaction (PCR)

Retinas were removed through a slit in the cornea and immediately frozen in liquid nitrogen. Total RNA was prepared using the RNeasy RNA isolation kit (Qiagen)