ROS production was measured using the
Fluorometric Intracellular ROS kit MAK143 (Sigma-Aldrich, St. Louis, MO) following the manufacturer’s protocol. Briefly, SH-SY5Y cells were seeded in black polystyrene 96-well plates for 24 h, followed by treatment with 1 μM of samples containing Aβ40 in the absence or presence of 10 molar equivalents of DOPAL after a 20 h incubation. The ROS production was monitored over time exploiting the fact that ROS species react with a fluorogenic sensor in the cytoplasm, resulting in a fluorometric product whose amount is proportional to the amount of ROS present. We thus measured the emission of fluorescence at 520 nm (excitation at 490 nm) at 37 °C using a plate reader (BMG Labtech, Aylesbury, UK).
Cataldi R., Chia S., Pisani K., Ruggeri F.S., Xu C.K., Šneideris T., Perni M., Sarwat S., Joshi P., Kumita J.R., Linse S., Habchi J., Knowles T.P., Mannini B., Dobson C.M, & Vendruscolo M. (2021). A dopamine metabolite stabilizes neurotoxic amyloid-β oligomers. Communications Biology, 4, 19.