Comprehensive transcriptomic analysis reveals canonical and novel pathways modulated by nanoceria in mammalian retinal degeneration

Retinal neurodegenerative diseases such as Age-related Macular Degeneration (AMD) and Retinitis Pigmentosa cause irreversible vision loss due to the limited regenerative capacity of the mammalian retina. Cerium oxide nanoparticles (nanoceria) are emerging therapeutics against oxidative stress and inflammation, major drivers of photoreceptor degeneration, but their mechanisms remain incompletely understood. We performed retinal transcriptomic analysis in a rat AMD model induced by intense light and treated intravitreally with nanoceria. Six groups were analyzed: control, light damage, vehicle, nanoceria, vehicle + light damage, and nanoceria + light damage. Light damage activated inflammatory and apoptotic programs, with upregulation of cytokines ( Tnf, Il6, Il1b, Ccl2 ) and downregulation of photoreceptor genes ( Rho, Pde6a/b, Gnat1 ). Nanoceria treatment counteracted these effects, suppressing pro-inflammatory mediators, restoring antioxidative genes ( Nfe2l2, Gclc, Sod2 ), and enhancing neuroprotective factors ( Bdnf, Cntf, Ngf ). Pathway analyses revealed inhibition of TNF/NF-κB/IL-17 signaling and activation of PI3K-Akt, JAK-STAT, and neurotrophin pathways. Unexpectedly, nanoceria also modulated amino acid and insulin metabolism (Ass1, Cps1, Insr, Irs1, Slc2a4) and reactivated transcription factors (Ascl1, Sox2, Notch1) typically silent in adult retina. Our findings highlight nanoceria as a multifunctional therapeutic that mitigates retinal degeneration by coordinating oxidative, inflammatory, and regenerative responses, supporting its translational potential to preserve vision in retinal neurodegenerative disease.