Overview
- The peer-reviewed mouse study by University of Oklahoma researchers was published in Cell Death & Disease and reported across outlets on July 29–30, 2026.
- Researchers found photoreceptors maintain an internal lysosomal recycling system that depends on the lipid kinase PIKfyve rather than relying solely on the retinal pigment epithelium for all waste clearance.
- Genetic deletion of PIKfyve in mice caused buildup of damaged proteins in photoreceptors, vacuoles and lysosomal marker changes, loss of outer nuclear layer thickness, and reduced rod and cone function.
- PIKfyve loss in RPE cells produced lipid and debris accumulation that mimics age-related macular degeneration, and partial PIKfyve reduction sped degeneration in P23H rhodopsin mutant mice used to model inherited retinitis pigmentosa.
- The work points to PIKfyve as a possible therapeutic target to protect vision but also warns that systemic PIKfyve inhibitors such as Apilimod, now in clinical development, should be evaluated for retinal toxicity before human use.