• Neuroscience · Nov 2024

    Aging abolishes circadian rhythms and disrupts temporal organization of antioxidant-prooxidant status, endogenous clock activity and neurotrophin gene expression in the rat temporal cortex.

    • Nicolás Andrés Deyurka, Lorena Silvina Navigatore-Fonzo, Cinthia Daiana Coria-Lucero, Mariana Lucila Ferramola, Silvia Marcela Delgado, María Gabriela Lacoste, and Ana Cecilia Anzulovich.
    • Laboratory of Chronobiology, Multidisciplinary Institute of Biological Research-San Luis (IMIBIO-SL), National Council of Science and Technology (CONICET), National University of San Luis (UNSL), Av Ejército de los Andes N° 950, D5700HHW, San Luis, Argentina; Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis (UNSL), Av Ejército de los Andes N° 950, D5700HHW, San Luis, Argentina.
    • Neuroscience. 2024 Nov 1; 559: 125138125-138.

    AbstractDisruption of circadian rhythms contributes to deficits in cognitive functions during aging. Up to date, the biochemical, molecular and chronobiological bases of such deterioration have not been completely elucidated. Here, we aim: 1) to investigate the endogenous nature of 24 h-rhythms of antioxidant defenses, oxidative stress, clocḱ's, and neurotrophic factors expression, in the rat temporal cortex (TC), and 2) to study the consequences of aging on the circadian organization of those factors. We observed a circadian organization of antioxidant enzymes activity, lipoperoxidation and the clock, BMAL1 and RORa, proteins, in the TC of young rats. Such temporal organization suggests the existence of a two-way communication among clock transcription factors and antioxidant defenses. This might generate the rhythmic and circadian expression of Bdnf and Rc3 genes involved in the TC-depending cognitive function. Noteworthy, such circadian organization disappears in the TC of aged rats. Aging also reduces glutathione peroxidase activity and expression, and it increases lipid peroxidation, throughout a 24 h-period. An increased oxidative stress makes the cellular redox environment change into an oxidative status which alters the endogenous clock activity and disrupts the circadian organization of, at least part, of the molecular basis of the synaptic plasticity in the TC.Copyright © 2024 International Brain Research Organization (IBRO). Published by Elsevier Inc. All rights reserved.

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