Kaempferol Extends Male Lifespan Under Blue Light Irradiation in <i>Drosophila</i>

Short-wavelength blue light is ubiquitous in daily life and has a lasting destructive influence. Its potential harm to biological health is significant. This study used Drosophila as a model organism to investigate the protective effects of kaempferol, a flavonoid, against the toxicity of blue light. It also examined its physiological effects on Drosophila under blue light irradiation. In this experiment, fruit flies were fed with three different concentrations of kaempferol solutions (0.1, 0.01, and 0.001 mol/L) dissolved in food. The survival rate and physiological indexes of Drosophila were investigated under blue light irradiation of 2500 lux. The results showed that 0.1 mol/L kaempferol increased the activity of male flies during the day and significantly extended the male survival time under blue light irradiation. However, the study found that kaempferol did not significantly prolong the survival time of Drosophila in the oxidative stress experiment, and no significant difference was observed in the feeding experiment. In summary, our research found that kaempferol, at the concentration of 0.1 mol/L, has a protective effect on Drosophila under blue light irradiation, potentially achieved through alterations in circadian rhythm.