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

dc.contributor.authorQuintanilla R.A.
dc.contributor.authorPérez M.J.
dc.contributor.authorAranguiz A.
dc.contributor.authorTapia-Monsalves C.
dc.contributor.authorMendez G.
dc.date.accessioned2020-09-02T22:26:28Z
dc.date.available2020-09-02T22:26:28Z
dc.date.issued2020
dc.identifier10.1007/s12640-020-00204-1
dc.identifier.citation38, 2, 421-433
dc.identifier.issn10298428
dc.identifier.urihttps://hdl.handle.net/20.500.12728/5928
dc.descriptionExcessive 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. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.
dc.language.isoen
dc.publisherSpringer
dc.subjectAlcohol
dc.subjectBinge drinking
dc.subjectEthanol
dc.subjectMitochondria
dc.subjectNrf-2
dc.subjectOxidative stress
dc.subjectadenosine triphosphate
dc.subjectalcohol
dc.subjectmelanocortin 4 receptor
dc.subjectneuroprotective agent
dc.subjectreactive oxygen metabolite
dc.subjectreduced nicotinamide adenine dinucleotide dehydrogenase (ubiquinone)
dc.subjectro 27 3225
dc.subjecttranscription factor Nrf2
dc.subjectunclassified drug
dc.subjectadolescent
dc.subjectanimal cell
dc.subjectanimal tissue
dc.subjectantioxidant activity
dc.subjectArticle
dc.subjectcalcium homeostasis
dc.subjectcell stress
dc.subjectcell viability
dc.subjectcontrolled study
dc.subjectdisorders of mitochondrial functions
dc.subjectembryo
dc.subjectenzyme activation
dc.subjecthippocampal neuronal culture
dc.subjectimmunofluorescence
dc.subjectmale
dc.subjectmitochondrial membrane potential
dc.subjectnonhuman
dc.subjectoxidative stress
dc.subjectpriority journal
dc.subjectprotein expression
dc.subjectprotein function
dc.subjectprotein localization
dc.subjectrat
dc.subjectreal time polymerase chain reaction
dc.subjectsignal transduction
dc.subjectupregulation
dc.titleActivation of the Melanocortin-4 Receptor Prevents Oxidative Damage and Mitochondrial Dysfunction in Cultured Hippocampal Neurons Exposed to Ethanol
dc.typeArticle


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