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Melatonin as a Harmonizing Factor of Circadian Rhythms, Neuronal Cell Cycle and Neurogenesis: Additional Arguments for Its Therapeutic Use in Alzheimer's Disease

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CURRENT NEUROPHARMACOLOGY
卷 21, 期 5, 页码 1273-1298

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BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/1570159X21666230314142505

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Melatonin; circadian rhythm; cell cycle; Alzheimer's disease; neurogenesis; therapeutic

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The synthesis and release of melatonin in the brain regulate various physiological functions. The decline in melatonin levels with aging leads to alterations in circadian rhythm components and increases susceptibility to develop neurodegenerative diseases. Circadian rhythm disturbances impact memory formation and recall. The molecular machinery of the cell cycle has a regulatory role in neurodegenerative disorders such as Alzheimer's disease. Understanding the mechanisms of action of melatonin in regulating circadian rhythm, cell cycle components, and neurogenesis may provide new therapeutic targets for Alzheimer's disease.
The synthesis and release of melatonin in the brain harmonize various physiological functions. The apparent decline in melatonin levels with advanced aging is an aperture to the neurodegenerative processes. It has been indicated that down regulation of melatonin leads to alterations of circadian rhythm components, which further causes a desynchronization of several genes and results in an increased susceptibility to develop neurodegenerative diseases. Additionally, as circadian rhythms and memory are intertwined, such rhythmic disturbances influence memory formation and recall. Besides, cell cycle events exhibit a remarkable oscillatory system, which is downstream of the circadian phenomena. The linkage between the molecular machinery of the cell cycle and complex fundamental regulatory proteins emphasizes the conjectural regulatory role of cell cycle components in neurodegenerative disorders such as Alzheimer's disease. Among the mechanisms intervening long before the signs of the disease appear, the disturbances of the circadian cycle, as well as the alteration of the machinery of the cell cycle and impaired neurogenesis, must hold our interest. Therefore, in the present review, we propose to discuss the underlying mechanisms of action of melatonin in regulating the circadian rhythm, cell cycle components and adult neurogenesis in the context of AD pathogenesis with the view that it might further assist to identify new therapeutic targets.

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