MANEB AND α-SYNUCLEIN: FRIENDS OR FOESIN NEURONAL TOXICITY

CONDE, MELISA A.; URANGA, ROMINA M.; ALZA, NATALIA P.; FUNK, MELANIA I.; SALVADOR, GABRIELA A.

Reunión virtual por pandemia COVID-19

Congreso; XXXV Reunión Anual (virtual) de la Sociedad Argentina de Investigación en Neurociencias (SAN); 2020

Maneb (Mb) exposure and α-synuclein (α-syn) overexpression are triggering factors of Parkinson?s disease. In this work, we studied the response to Mb toxicity in neurons stably expressing the human wild type α-syn gene (WT α-syn).In control neurons, Mb cytotoxicity involved an increase in reactive oxygen species (ROS), α-syn overxpression and the loss in plasma membrane integrity. Experiments with the antioxidant N-acetylcysteine proved that the increase in α-syn expression induced by the pesticide was redox-dependent. In addition, WT α-syn neurons exposed to Mb showed decreased ROS content and less plasma membrane damage, with no additional changes in α-syn expression. To further characterize the response to Mb exposure, FoxO3a and Nrf2, two transcription factors activated upon cell injury, were evaluated. Mb exposure triggered Akt phosphorylation and the kinase-dependent FoxO3a inhibition in control cells. However, Mb exposure had no differential effect on FoxO3a status in WT α-syn cells. On the other hand, the expression of Nrf2-regulated phase-two antioxidant genes was increased in WT α-syn neurons. These results show that a neuroprotective response can be elicited when α-syn is overexpressed prior to pesticide exposure. Additional studies are necessary to solve the question whether α-syn is friend or foe in pesticide-induced toxicity.