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. 2020 Aug;38(2):421-433.
doi: 10.1007/s12640-020-00204-1. Epub 2020 May 6.

Activation of the Melanocortin-4 Receptor Prevents Oxidative Damage and Mitochondrial Dysfunction in Cultured Hippocampal Neurons Exposed to Ethanol

Rodrigo A Quintanilla #  1 , María José Pérez #  2 , Alejandra Aranguiz  2 , Carola Tapia-Monsalves  2 , Gloria Mendez  2
Affiliations

Activation of the Melanocortin-4 Receptor Prevents Oxidative Damage and Mitochondrial Dysfunction in Cultured Hippocampal Neurons Exposed to Ethanol

Rodrigo A Quintanilla et al. Neurotox Res. 2020 Aug.

Abstract

Excessive alcohol intake affects hippocampal function and neuronal communication through oxidative stress and mitochondrial impairment. Previous studies have suggested that the melanocortin system (MCS) plays an essential role in alcohol consumption and addiction. The MCS is a hypothalamic region involved in regulating inflammatory processes in the brain, and its pharmacological activation through the melanocortin-4 receptor (MC4R) reduces both alcohol consumption and the neuroinflammatory responses in the brain. However, the cellular mechanisms involved in the beneficial actions of MCS against ethanol toxicity are not entirely understood. The objective of this study was to investigate the protective role of the MC4R pharmacological activator RO27-3225 on oxidative damage and mitochondrial impairment present in hippocampal neuronal cultures acutely exposed to ethanol (50, 75 mM, 24 h). Pre-treatment with RO27-3225 (250 nM, 1 h) prevented reactive oxygen species (ROS) increase, dysregulation of cytosolic calcium homeostasis, and mitochondrial potential loss induced by ethanol. Improvement of mitochondrial failure produced by RO27-3225 was accompanied by a significant increase in ATP production in ethanol-treated neurons. More importantly, RO27-3225 promoted the activation of the antioxidant pathway Nrf-2, demonstrated by an increase in the expression and nuclear translocation of Nrf-2, and upregulation of mRNA levels of NAD(P)H quinone oxidoreductase 1 (NQO1), an antioxidant enzyme which expression is activated by this pathway. These results suggest that the stimulation of MC4R prevents oxidative damage and mitochondrial stress induced by ethanol through the activation of the Nrf-2 pathway in cultured hippocampal neurons. These results are novel and demonstrate the critical function of MC4R in promoting antioxidant defense and reducing mitochondrial damage produced by ethanol in the brain.

Keywords: Alcohol; Binge drinking; Ethanol; Mitochondria; Nrf-2; Oxidative stress.

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References

    1. Abrahao KP, Salinas AG, Lovinger DM (2017) Alcohol and the brain: neuronal molecular targets, synapses, and circuits. Neuron 96:1223–1238. https://doi.org/10.1016/j.neuron.2017.10.032 - DOI - PubMed - PMC
    1. Ali T, Rehman SU, Shah FA, Kim MO (2018) Acute dose of melatonin via Nrf2 dependently prevents acute ethanol-induced neurotoxicity in the developing rodent brain. J Neuroinflammation 15:1–19. https://doi.org/10.1186/s12974-018-1157-x - DOI
    1. Bitto A, Polito F, Irrera N, Calò M, Spaccapelo L, Marini HR, Giuliani D, Ottani A, Rinaldi M, Minutoli L, Guarini S, Squadrito F, Altavilla D (2012) Protective effects of melanocortins on short-term changes in a rat model of traumatic brain injury. Crit Care Med 40:945–951 - DOI
    1. Boyadjieva NI, Sarkar DK (2013) Microglia play a role in ethanol-induced oxidative stress and apoptosis in developing hypothalamic neurons. Alcohol Clin Exp Res 37:252–262. https://doi.org/10.1111/j.1530-0277.2012.01889.x - DOI - PubMed
    1. Caruso C, Durand D, Schioth HB, Rey R, Seilicovich A, Lasaga M (2007) Activation of melanocortin 4 receptors reduces the inflammatory response and prevents apoptosis induced by lipopoly- saccharide and interferon-gamma in astrocytes. Endocrinology. 148:4918–4926 - DOI

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