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Melatonin, a key antioxidant, combats aging and neurodegeneration by reducing inflammation and protecting brain cells. Its levels decline with age, impacting circadian rhythms and increasing disease risk.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Immunology

Background:

  • Melatonin exhibits antioxidant, mitochondrial, and neuroprotective properties beneficial for healthy aging.
  • Melatonin levels decrease with senescence and are reduced in neurodegenerative diseases like Alzheimer's and diabetes.
  • The role of melatonin in inflammaging, a low-grade inflammation linked to aging, remains underexplored.

Purpose of the Study:

  • To review melatonin's protective actions against inflammation and inflammaging in the brain.
  • To explore the role of melatonin metabolites in mitigating inflammatory responses.
  • To connect melatonin's effects with aging, immune function, and neurodegeneration.

Main Methods:

  • Review of experimental evidence from aging and senescence-accelerated animal models.
  • Analysis of melatonin's actions on the immune system.
  • Examination of the relationship between melatonin, sirtuins, and circadian rhythms.

Main Results:

  • Melatonin and its metabolites attenuate inflammatory responses by reducing excitotoxicity and free radical formation.
  • Melatonin prevents NADPH oxidase activation and suppresses inducible nitric oxide synthase.
  • Melatonin downregulates proinflammatory cytokines and supports mitochondrial function.

Conclusions:

  • Melatonin plays a crucial role in combating inflammaging and protecting against neurodegeneration.
  • Melatonin's interaction with sirtuins and circadian oscillators highlights its importance in aging processes.
  • Restoring melatonin levels may offer therapeutic benefits for age-related cognitive decline and diseases.