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Rip3 knockdown rescues photoreceptor cell death in blind pde6c zebrafish.

I A Viringipurampeer1, X Shan1, K Gregory-Evans1

  • 1Department of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, BC V5Z 3N9, Canada.

Cell Death and Differentiation
|January 14, 2014
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Targeting necroptosis in cone photoreceptors shows promise for treating achromatopsia. Inhibiting receptor-interacting protein kinases (RIPK) 1 and 3 delays cone cell death and restores vision in zebrafish models.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Cell Biology

Background:

  • Achromatopsia is a genetic retinal disease causing progressive vision loss due to photoreceptor degeneration.
  • Genetic heterogeneity in achromatopsia necessitates mutation-independent therapeutic strategies.
  • Cone photoreceptor death is a primary event in achromatopsia, leading to severe visual impairment.

Purpose of the Study:

  • To investigate the cell death mechanisms in cone and rod photoreceptors in a zebrafish model of achromatopsia (pde6c(w59) mutant).
  • To evaluate the therapeutic potential of targeting necroptosis pathways for achromatopsia treatment.

Main Methods:

  • Utilized pde6c(w59) mutant zebrafish to study photoreceptor degeneration.
  • Employed morpholino gene knockdown of rip3 and pharmacological inhibition of RIP1/RIP3 kinases.
  • Assessed cell death pathways (necroptosis, apoptosis) and visual function restoration.

Main Results:

  • Cone photoreceptors in pde6c(w59) mutants undergo necroptosis, regulated by RIP1 and RIP3 kinases.
  • Rod photoreceptors exhibit caspase-3-dependent apoptosis.
  • RIP3 knockdown or RIP1/RIP3 inhibition rescued cone photoreceptors, reduced reactive oxygen species, and improved visual function.
  • Upregulation of rod phosphodiesterase genes (pde6a, pde6b) compensated for cone pde6c deficiency.

Conclusions:

  • Cone cell death in this achromatopsia model occurs via necroptosis, while rod cell death is apoptotic.
  • Targeting RIP kinase signaling presents a viable therapeutic strategy for achromatopsia and potentially other retinal degenerations.
  • Combined approaches targeting multiple cell death pathways may offer broader therapeutic benefits for retinal diseases.