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An evaluation of the neuroprotective effects of melatonin in an in vitro experimental model of age-induced neuronal apoptosis

Authors

  • Marta Tajes Orduña,

    1. Centro de Investigación de Biomedicina en Red en Enfermedades Neurodegenerativas (CIBERNED), Unitat de Farmacologia i Farmacognòsia and Institut de Biomedicina (IBUB), Barcelona, Spain
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  • Carme Pelegrí Gabalda,

    1. Departament de Fisiología, Facultat de Farmàcia, Centro de Investigación de Biomedicina en Red en Enfermedades Neurodegenerativas (CIBERNED), Universitat de Barcelona, Nucli Universitari de Pedralbes, Barcelona, Spain
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  • Jordi Vilaplana Hortensi,

    1. Departament de Fisiología, Facultat de Farmàcia, Centro de Investigación de Biomedicina en Red en Enfermedades Neurodegenerativas (CIBERNED), Universitat de Barcelona, Nucli Universitari de Pedralbes, Barcelona, Spain
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  • Mercè Pallàs LLiberia,

    1. Centro de Investigación de Biomedicina en Red en Enfermedades Neurodegenerativas (CIBERNED), Unitat de Farmacologia i Farmacognòsia and Institut de Biomedicina (IBUB), Barcelona, Spain
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      Senior co-authors.

  • Antoni Camins Espuny

    1. Centro de Investigación de Biomedicina en Red en Enfermedades Neurodegenerativas (CIBERNED), Unitat de Farmacologia i Farmacognòsia and Institut de Biomedicina (IBUB), Barcelona, Spain
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      Senior co-authors.


Address reprint requests to Antoni Camins Espuny, PhD, Institut de Biomedicina (IBUB), Centros de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CIBERNED), Unitat de Farmacologia i Farmacognòsia.
E-mail: camins@ub.edu
Mercè Pallàs, PhD, Facultat de Farmàcia, Universitat de Barcelona, Nucli Universitari de Pedralbes, 08028 Barcelona, Spain.
E-mail: pallas@ub.edu

Abstract

Abstract:  The neuroprotective effects of melatonin in an experimental model of aging-induced apoptosis have been examined. Cerebellar granule neurons show characteristics of apoptosis after 17 days in culture (DV). The addition of melatonin to neuronal cell cultures (100–500 μm) resulted in neuroprotective and antiapoptotic effects, which were revealed by nuclear condensed cell counting. In a thorough analysis by Western-blot of the potential pathways responsible for melatonin’s neuroprotective effects, we found an increase in the activation of prosurvival Akt. Subsequently GSK3β inhibition and an increase in p-FOXO1 phosphorylation occurred. In this model of aging, apoptosis was associated with an elevated DNA damage, as demonstrated by an increase in the activation of ataxia telangiectasia muted (ATM). Subsequently, downstream targets such as p53 were activated. Furthermore, the process of DNA damage was coupled to an increase in the expression of certain proteins involved in cell cycle regulation; these were cyclin D and the proapoptotic transcription factor E2F-1. We conclude that the antiapoptotic effects of melatonin were mediated by two potential mechanisms: by increasing the activity of prosurvival pathways via Akt and by the prevention of DNA damage (via ATM inhibition) followed by the reduction of cell cycle re-entry.

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