2026-06-05T17:54:03Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/275362026-02-03T12:27:56Zcom_10630_2254col_10630_37959

Antioxidant and neuroprotective actions of IGF-II against glucocorticoid-induced toxicity in dopaminergic neurons. Claros-Gil, Silvia Valverde Moreno, Nadia Zamorano-González, Pablo Romero-Zerbo, Silvana Yanina Lara Fernández, Estrella Boraldi, Federica Pavía-Molina, José García-Fernández, María Inmaculada Gago-Calderón, Belén Martín-Montañez, Elisa Cerebro - Envejecimiento Parkinson, Enfermedad de Hormonas peptídicas The neurodegenerative Parkinson’s disease (PD) affects 1–3% of the population aged over 65. A wide range of pathways and mechanisms are involved in its pathogenesis, such as oxidative stress, mitochondrial dysfunction, inflammation and neuronal glucocorticoid-induced toxicity, which ultimately produce a progressive loss of nigral dopamine neurons. Insulin-like growth factor II (IGF-II) has shown antioxidant and neuroprotective effects in some neurodegenerative disorders. Therefore, our aim was to study IGF-II protective effects against oxidative damage on a cellular combined model of PD and mild to moderate stress, based on corticosterone (CORT), an endocrine response marker to stress, and the dopaminergic neurotoxin 1-methyl-4-phenylpyridinium (MPP+). The dopaminergic neuronal cell line SN4741 (RRID:CVCL_S466) derived from mouse substantia nigra were exposed to 200 μM MPP+, 0.5 μM CORT or both, with or without 25 ng/mL IGF-II, for 2.5 or 6 h. Cell viability, oxidative stress parameters, mitochondrial and dopamine markers and intracellular signaling pathways were evaluated. The administration of MPP+ or CORT individually led to cell damage compared to control situations, whereas the combination of both drugs produced very considerable toxic synergistic effect. IGF-II counteracts the mitochondrial-oxidative damage, protecting dopaminergic neurons from death and neurodegeneration. IGF-II maintained the tyrosine hydroxylase expression and promotes nuclear factor (erythroid-derived 2)-like 2 antioxidant response in a glucocorticoid receptor-dependent pathway, preventing oxidative cell damage and maintaining mitochondrial function. This work revealed the potential neuroprotective role of IGF-II to protect nigral dopamine neurons against mitochondrial-oxidative damage induced by CORT and MPP+ was demonstrated. Thus, IGF-II is a potential therapeutic tool for prevention and treatment of PD patients suffering mild to moderate emotional stress. 2023-09-15T11:37:16Z 2023-09-15T11:37:16Z 2023 conference output https://hdl.handle.net/10630/27536 eng 11th IBRO World Congress of Neuroscience IBRO 2023 GRANADA 09/09/2023 open access