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Melatonin, mitochondria, and the skin.

Andrzej T Slominski1,2, Michal A Zmijewski3, Igor Semak4

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Melatonin and its skin metabolites are vital for maintaining skin homeostasis and protection. The melatonin-mitochondria axis is an evolutionarily conserved mechanism for skin injury response and repair.

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Area of Science:

  • Dermatology
  • Cell Biology
  • Biochemistry

Background:

  • The skin acts as a barrier, sensing and adapting to environmental stressors to maintain homeostasis.
  • Melatonin synthesis and metabolism in the skin are crucial for its physiological functions and protection.
  • Melatonin and its metabolites play a role in attenuating pathological skin conditions like carcinogenesis and inflammation.

Purpose of the Study:

  • To highlight the role of the melatonin-mitochondria axis in skin homeostasis and protection.
  • To emphasize the protective effects of melatonin and its metabolites against environmental damage, particularly UV radiation.
  • To propose that melatonin-related mitochondrial functions are an evolutionarily conserved mechanism for skin repair.

Main Methods:

  • Review of existing literature on melatonin metabolism and function in skin.
  • Analysis of the role of mitochondria in skin cell melatonin metabolism.
  • Examination of evidence for melatonin's protective effects against UV radiation and mitochondrial dysfunction.

Main Results:

  • Melatonin and its metabolites are essential for skin physiological functions and homeostasis.
  • Mitochondria are central to melatonin metabolism in skin cells.
  • Melatonin and its metabolites protect against UV radiation, modulate mitochondrial redox and bioenergetics, and exhibit anti-apoptotic effects.
  • Some melatonin metabolites show greater protective effects than melatonin itself.

Conclusions:

  • The melatonin-mitochondria axis is critical for controlling skin functions that protect local and global homeostasis.
  • Melatonin-related mitochondrial functions represent an evolutionarily conserved mechanism for cellular adaptation to skin injury and repair.