Receptor-Interacting Protein Kinase-3 Expression Impacts Ocular Vascular Development and Pathological...

Area of Science:

• Ophthalmology
• Cell Biology
• Molecular Biology

Background:

• Regulated cell death pathways, including necroptosis, are crucial for ocular vascular development and homeostasis.
• The specific roles of these pathways, particularly necroptosis regulators like Ripk3, in ocular vascularization remain largely unexplored.

Purpose of the Study:

• To investigate the function of receptor-interacting protein kinase-3 (Ripk3) in postnatal retinal vascularization.
• To determine the role of Ripk3 in pathological retinal and choroidal neovascularization.

Main Methods:

• Analysis of retinal vascularization in Ripk3-deficient (Ripk3-/-) mice.
• Assessment of laser-induced choroidal neovascularization and oxygen-induced ischemic retinopathy in Ripk3-/- mice.
• Evaluation of the effect of RIPK1/3 inhibition on choroidal neovascularization.

Main Results:

• Ripk3 deficiency did not significantly alter normal postnatal retinal vascularization.
• A decrease in retinal endothelial cells and pericytes was observed in Ripk3-/- mice at 3 weeks.
• Absence of Ripk3 expression increased both choroidal and retinal neovascularization.
• Inhibition of RIPK1/3 activity reduced choroidal neovascularization.

Conclusions:

• Ripk3 plays a distinct role in pathological ocular neovascularization, distinct from its role in normal vascular development.
• Ripk3's modulation of cell death pathways, potentially via Caspase 8 interactions, influences ocular vascular pathologies.