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The circadian gene mPer2 regulates the daily rhythm of IFN-gamma

Alvaro Arjona1, Dipak K Sarkar

  • 1Endocrine Program and Department of Animal Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901, USA.

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
|September 19, 2006
PubMed

Insights

The circadian system directly regulates interferon-gamma (IFN-gamma) production. Loss of the Per2 gene disrupts daily rhythms of IFN-gamma, impacting immune response and potentially increasing susceptibility to disease.

Area of Science:

  • Immunology
  • Chronobiology
  • Molecular Biology

Background:

  • Circadian and daily rhythms govern physiological processes and behavior.
  • Circadian disruptions are linked to increased susceptibility to infection and cancer.
  • Molecular links between the circadian and immune systems remain largely unknown.

Purpose of the Study:

  • To investigate the molecular connection between the circadian clock and immune response.
  • To determine the role of the Per2 gene in regulating daily rhythms of immune factors.

Main Methods:

  • Utilized Per2 mutant mice lacking a functional molecular circadian clock.
  • Measured daily rhythms of interferon-gamma (IFN-gamma) mRNA and protein expression in spleen.
  • Assessed serum levels of IFN-gamma and expression of canonical clock genes.

Main Results:

  • Per2 mutant mice exhibited a lack of daily rhythm in splenic IFN-gamma mRNA and protein.
  • Mutant mice showed altered expression of core circadian clock genes.
  • IFN-gamma serum levels lacked daily rhythm and were lower in Per2 mutant mice compared to wild-type.

Conclusions:

  • The Per2 gene is crucial for the circadian regulation of IFN-gamma production.
  • These findings reveal a direct link between the circadian system and a key immune cytokine.
  • Disruption of circadian rhythms may impair immune function through altered IFN-gamma regulation.

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