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Mouse Models in Circadian Rhythm and Melatonin Research.

Horst-Werner Korf1, Charlotte von Gall2

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Inbred and transgenic mice are crucial for studying the mammalian circadian system. Only melatonin-proficient mouse strains are suitable for investigating the complex roles of melatonin in the pineal gland, SCN, and PT.

Keywords:
locomotor activitymelatonin receptorspars tuberalisphase shiftpineal organsuprachiasmatic nucleus

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Area of Science:

  • Neuroscience
  • Chronobiology
  • Genetics

Background:

  • The mammalian circadian and melatoninergic systems are vital for regulating physiological processes.
  • Inbred and transgenic mouse strains offer valuable models for studying these systems.
  • Key components include the pineal organ, suprachiasmatic nuclei (SCN), and hypophysial pars tuberalis (PT).

Purpose of the Study:

  • To review the utility of mouse models in understanding the mammalian melatoninergic and circadian system.
  • To highlight the roles of the pineal gland, SCN, and PT in melatonin synthesis and action.
  • To identify suitable mouse strains for research on circadian rhythms and melatonin signaling.

Main Methods:

  • Review of existing literature on inbred and transgenic mouse strains.
  • Analysis of molecular mechanisms controlling melatonin biosynthesis.
  • Examination of melatonin's effects on the SCN and PT.
  • Assessment of locomotor activity and seasonal rhythmicity in mouse models.

Main Results:

  • Melatonin is synthesized in pinealocytes and acts on MT1 and MT2 receptors in the SCN and PT.
  • Melatonin synchronizes circadian rhythms with light, aids re-entrainment, and stabilizes the circadian system.
  • Melatonin is essential for PT function and seasonal rhythmicity, driving the PT molecular clockwork.
  • Inbred and transgenic mice lacking seasonal reproduction still possess intact PT pathways if melatonin-proficient.

Conclusions:

  • Inbred and transgenic mouse strains are indispensable tools for dissecting the mammalian circadian and melatoninergic systems.
  • Melatonin plays critical roles in circadian rhythm synchronization, re-entrainment, and seasonal regulation.
  • Only melatonin-proficient mouse strains are appropriate for accurate investigation of these systems.