Activation of Survival Pathways In The Degenerating Retina of rd10 Mice

Survival rd10

An interesting article was published  in Experimental Eye Research by Marijana Samardzija, Hedwig Wariwoda, Cornelia Imsand, Philipp Huber, Severin R. Heynen, Andrea Gubler and Christian Grimm that examines survival pathways that are induced in the retinas of rd10 mice.  Dynamics of retinal degeneration in the rd10 mouse was also examined including an analysis of retinal vasculature and kinetics.  The study is fairly comprehensive including crude anatomical approaches, biochemistry, real-time PCR, Western blotting and immunofluorescence.  They recapitulate some of the studies that have examined development of the rd10 mouse up to pnd15, but then explored the phases of initial retinal degeneration and explored survival mechanisms and pathways (Lif, Edn2, Fgf2, Mt1, Mt2, p-JAK2, CASP1 and GFAP) in the cells that remain.  It would have been interesting to follow these results at later stages of degeneration.  The authors mention remodeling, but only in passing which was too bad as there are some really interesting aspects of cell survival there.  Regardless, its an interesting paper worthy of having a look at.

 

Notable Paper: Receptor interacting protein kinase mediates necrotic cone but not rod cell death in a mouse model of inherited degeneration

How photoreceptor cells go through the process of cell death has been an outstanding question.  The authors of this paper by Yusuke Murakami, Hidetaka Matsumoto, Miin Roh, Jun Suzuki, Toshio Hisatomi, Yasuhiro Ikeda, Joan W. Miller, and Demetrios G. Vavvas have further defined the process and identified the receptor interacting protein kinase (RIP) pathway as a possible target for intervention in patients with retinitis pigmentosa (RP).  The authors used the rd10 mouse model, a mouse model of retinitis pigmentosa to examine the cell death process.  They defined RIP kinase as a mediator of necrotic cell death in cones.  RIP3, has been defined as they key regulator of programmed necrosis and its expression was elevated in rd10 retinas during cone photoreceptor death and not rod photoreceptor death.  Furthermore, the cone photoreceptor cell death was rescued by RIP3 deficiency and by pharmacological treatment with RIPkinase inhibitors. Continue reading “Notable Paper: Receptor interacting protein kinase mediates necrotic cone but not rod cell death in a mouse model of inherited degeneration”