News News

Increase of the benzothiazole moiety content of pheomelanin pigment after endogenous free radical inducement

Pheomelanin, the sulfurated form of melanin pigment, is known to produce reactive oxygen species (ROS) and oxidative stress-mediated cytotoxicity. Previous studies have shown a conversion of the benzothiazine moiety of pheomelanin to the benzothiazole moiety under heat or energetic radiation exposure, but it is unknown whether endogenous conditions can also produce this structural change. An endogenous free radical production was experimentally induced by exposing male zebra finches Taeniopygia guttata to diquat dibromide in drinking water during the development of pheomelanin-pigmented flank feathers. The benzothiazine-to-benzothiazole ratio of feather pheomelanin decreased more and was significantly lower in diquat-treated birds than in controls. Therefore, endogenous free radicals, and not only environmental radiation, can also promote structural changes in pheomelanin. While it was previously assumed that benzothiazine is responsible for the redox reaction of pheomelanin, recent findings suggest that benzothiazole has a greater ability to deplete antioxidants. Therefore, the possibility should be considered that the supplementation of antioxidants to limit the effects of endogenous free radicals can contribute to prevent melanoma, a disease that is favored by oxidative stress produced by pheomelanin. informacion[at] Rodríguez-Martínez et al (2020) Increase of the benzothiazole moiety content of pheomelanin pigment after endogenous free radical inducement. Dyes and Pigments. DOI 10.1016/j.dyepig.2020.108516
Average (0 Votes)

Latest News Latest News

Impact of fisheries on sea turtles

The bycatch of sea turtles by industrial fisheries is receiving an increasing attention in recent years due to the high impact it causes on these endangered species. This issue was evaluated in...

The structure of waterbird seed dispersal networks is not mediated by functional traits

Plants and their dispersers form interaction networks whose structure has important implications for the persistence and stability of the community. Frugivory is vital for the dispersal of many...

Mosquitoes are attracted to Plasmodium-infected birds

Parasites can manipulate their hosts to increase their transmission success. Avian malaria parasites (Plasmodium) are thought to alter the cues such as host odour, used by host-seeking mosquitoes....