Stress-induced preference for antioxidants by Drosophila

Abstract

In an ever- changing environment, animals make optimal decisions to ensure their nutrients they require to maintain homeostasis. Under extreme circumstances (e.g., infection), they may exhibit ingestive behaviors, such as seeking out substances (e.g., toxins) that suggest self- medication. Few studies, however, have investigated the mechanisms that ensue self- medication. Here, we report the selective intake of antioxidants by Drosophila melanogaster during a period of heat stress or sleep deprivation. This preference was alleviated by prefeeding them vitamin C or dehydroascorbic acid (DHA) before exposure to stress. Heat stress led to an increase in reactive oxygen species (ROS) levels in the gut, which was alleviated by the intake of vitamin C. Heat stress reduced vitamin C in hemolymph, whereas the consumption of vitamin C or DHA increased it. Furthermore, the intake of vitamin C ameliorated the intestinal barrier dysfunction and extended the survival of flies that had been exposed to chronic heat stress. The peripheral chemosensory receptors for this micronutrient. We propose that fruit flies come environmental challenges.