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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
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Melatonin--a pleiotropic, orchestrating regulator molecule.

Rüdiger Hardeland1, Daniel P Cardinali, Venkatramanujam Srinivasan

  • 1Johann Friedrich Blumenbach Institute of Zoology and Anthropology, University of Goettingen, Berliner Str. 28, Lower Saxony, D-37073 Goettingen, Germany. rhardel@gwdg.de

Progress in Neurobiology
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Summary
This summary is machine-generated.

Melatonin, a neurohormone, regulates circadian rhythms and sleep. It also impacts inflammation, neuroprotection, and metabolic health through various cellular mechanisms and receptors.

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Area of Science:

  • Neuroendocrinology
  • Chronobiology
  • Mitochondrial Biology

Background:

  • Melatonin, a neurohormone from the pineal gland, is synthesized in multiple tissues.
  • It signals through G protein-coupled receptors and potentially nuclear receptors.
  • Melatonin influences circadian rhythms, sleep, and peripheral oscillators.

Purpose of the Study:

  • To review the diverse roles and mechanisms of melatonin action.
  • To highlight emerging research areas in melatonin's therapeutic potential.
  • To explore melatonin's impact on metabolic syndrome, aging, and neuroprotection.

Main Methods:

  • Literature review of melatonin's signaling pathways.
  • Analysis of melatonin's effects on circadian rhythms and cellular processes.
  • Examination of emerging research on melatonin's role in disease and aging.

Main Results:

  • Melatonin regulates circadian rhythms and promotes sleep via central and peripheral actions.
  • It modulates inflammation and excitotoxicity through nitric oxide synthases.
  • Melatonin influences metabolic processes, potentially impacting diabetes and insulin resistance.
  • Mitochondrial effects include electron flux regulation, free radical scavenging, and a role in biogenesis.

Conclusions:

  • Melatonin possesses pleiotropic effects extending beyond circadian regulation.
  • Emerging research suggests significant roles in metabolic health, neuroprotection, and aging.
  • Further investigation into melatonin's therapeutic applications is warranted.