Melatonin, clock genes and mitochondria in sepsis

Area of Science:

• Chronobiology
• Immunology
• Mitochondrial Biology

Background:

• Circadian rhythms, regulated by clock genes, influence peripheral systems including immunity.
• Disruption of clock gene expression is linked to diseases, aging, and immune system alterations.
• Sepsis involves an exaggerated innate immune response and disrupted circadian rhythms.

Purpose of the Study:

• To review the interplay between clock genes, innate immunity, and mitochondria in health and sepsis.
• To highlight the role of melatonin in maintaining clock homeostasis and immune function.

Main Methods:

• Review of experimental and clinical data on circadian rhythms in sepsis.
• Analysis of the molecular mechanisms linking clock genes, immune mediators, and mitochondrial function.
• Examination of melatonin's effects on circadian rhythms and immune responses.

Main Results:

• Chronodisruption exacerbates innate immunity, leading to inflammation and mitochondrial dysfunction.
• This dysfunction results in bioenergetic decay, reactive oxygen species formation, and inflammasome activation.
• Melatonin administration normalizes circadian rhythms, innate immunity, and mitochondrial homeostasis.

Conclusions:

• Clock gene disruption creates a vicious cycle favoring innate immunity and inflammation in sepsis.
• Mitochondrial dysfunction and inflammasome activation are key consequences of chronodisruption in sepsis.
• Melatonin is a promising therapeutic agent for restoring homeostasis in sepsis by targeting clock genes, immunity, and mitochondria.