Spectral and color temperature dependence of LED exposure on retinal damage and the protective effects of neohesperidin.
Level 5 - mechanism / opinion, no new human data
Preclinical laboratory research (rodent animal model and in vitro cell culture)
PubMed 40073747 · doi:10.1016/j.jphotobiol.2025.113148
What was done
Sprague-Dawley rats and 661W retinal cells were exposed to four LED lighting conditions: conventional 2700K, conventional 5000K, full-spectrum 2700K, and full-spectrum 5000K. Retinal histological damage and autophagy markers in rats were evaluated by hematoxylin and eosin staining and immunofluorescence. In 661W cells, cell viability, reactive oxygen species generation, mitochondrial membrane potential (JC-1), apoptosis, and gene/protein expression were measured before and after intervention with 25 µM neohesperidin.
What was found
LED exposure induced retinal tissue damage in rats and increased reactive oxygen species, JC-1 monomer aggregation, and apoptosis in 661W cells. Full-spectrum 2700K LED caused the least severe damage among all groups. Treatment with 25 µM neohesperidin reduced reactive oxygen species, JC-1 aggregation, and apoptosis, normalized mitochondrial autophagy levels, and decreased Crx and Arrestin-1 mRNA expression. Specific numerical values and effect sizes were not reported in the abstract.
Why it matters
The study suggests that lower correlated color temperature, full-spectrum lighting reduces retinal photochemical stress compared to conventional or higher-temperature LEDs, and identifies neohesperidin as a candidate compound for mitigating phototoxicity.
Limits
Findings are strictly preclinical, utilizing an in vitro cell line and a rodent model with unspecified sample sizes. Human exposure dynamics, long-term safety, and translational efficacy of neohesperidin were not assessed.
Cited by
- partial LED lighting damages mitochondria.