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Aging disrupts the temporal organization of antioxidant defenses in the heart of male rats and phase shifts circadian rhythms of systolic blood pressure

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Abstract

Aging is one of the main risk factors for cardiovascular diseases, and oxidative stress is a key element responsible for the development of age-related pathologies. In addition, the alteration of circadian rhythms also contributes to cardiovascular pathology, but the underlying mechanisms are not well defined. We investigated the aging consequences on the temporal patterns of antioxidant defenses, the molecular clock machinery, and the blood pressure, in the heart of male rats maintained under constant darkness (free running) conditions. Male Holtzman rats from young adult (3-month-old) and older (22-month-old) groups were maintained under constant darkness (12-h dark:12-h dark, DD) condition during fifteen days before the experiment. After the DD period, heart ventricle samples were isolated every 4-h throughout a 24-h period. We observed circadian rhythms of catalase (CAT) and glutathione peroxidase (GPx) mRNA expression, as well as ultradian rhythms of Nrf2 mRNA levels, in the heart of young adult rats. We also found circadian oscillations of CAT and GPx enzymatic activities, reduced glutathione (GSH) and BMAL1 protein in the same group. Interestingly, aging abolished the rhythms of CAT and GPx enzymatic activities, phase-shifted the rhythm’s acrophases of GSH and BMAL1 protein levels and turned circadian the ultradian oscillation of Nrf2 expression. Moreover, aging phase-shifted the circadian pattern of systolic blood pressure. In conclusion, aging modifies the temporal organization of antioxidant defenses and blood pressure, probably, as a consequence of a disruption in the circadian rhythm of the clock’s transcriptional regulator, BMAL1, in heart.

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The data that support the findings of the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

We acknowledge the Laboratorio de Cronobiología at the Instituto Multidisciplinario de Investigaciones Biológicas-San Luis (IMIBIO-SL), the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and the Facultad de Química, Bioquímica y Farmacia (FQByF) at the Universidad Nacional de San Luis (UNSL). Maria G Lacoste and Ana C Anzulovich are members of the research career at the CONICET.

Funding

This work was supported by the Agencia Nacional de Promoción Científica y Tecnológica [BID Grant PICT 2016-0332-FONCyT-ANPCyT, Argentina], the Consejo Nacional de Investigaciones Científicas y Técnicas [Grant PIP 00446-CONICET, Argentina] and the Universidad Nacional de San Luis [Grant PROICO 2-0518-UNSL, Argentina].

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ACA, MGL and SMD contributed to the study conception and design. FGA, ICP and MLT performed the experiments and/or data collection. FGA, MLF, MGL and ACA analyzed and interpreted data. The first draft of the manuscript was written by FGA and MGL and all authors contributed, revised critically, and commented on the manuscript. ACA: funding acquisition and supervision. All authors read and approved the final manuscript.

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Correspondence to Ana Cecilia Anzulovich or María Gabriela Lacoste.

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The authors declare that they have no conflicts of interest.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution at which the studies were conducted (National University of San Luis Committee's Guidelines for the Care and Use of Experimental Animals, Protocols Nos. B-83/16 and B-242/16 approved by Res. RCD-2–61/17-UNSL and Protocols Nos. B-83/17, B-278/17 and B-279/17 approved by Res. RCD-2–296/17-UNSL).

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Altamirano, F.G., Castro-Pascual, I.C., Ferramola, M.L. et al. Aging disrupts the temporal organization of antioxidant defenses in the heart of male rats and phase shifts circadian rhythms of systolic blood pressure. Biogerontology 22, 603–621 (2021). https://doi.org/10.1007/s10522-021-09938-7

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  • DOI: https://doi.org/10.1007/s10522-021-09938-7

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