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Mouse intestinal cryptdins exhibit circadian oscillation.

Oren Froy1, Nava Chapnik, Ruth Miskin

  • 1Institute of Biochemistry, Food Science and Nutrition, Faculty of Agricultural, Food and Environmental Quality, The Hebrew University of Jerusalem, Rehovot, Israel. froy@agri.huji.ac.il

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|September 1, 2005
PubMed
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The biological clock regulates mouse enteric defensin (cryptdin) expression in the small intestine, with levels peaking during the dark phase. Food intake also influences this circadian rhythm.

Area of Science:

  • Immunology
  • Chronobiology
  • Gastroenterology

Background:

  • Innate immunity relies on antibacterial peptides called defensins to fight ingested bacteria.
  • Mouse enteric defensins (cryptdins) are constitutively produced but upregulated during infection or inflammation.

Purpose of the Study:

  • To investigate the role of the biological clock in regulating cryptdin expression under healthy conditions.
  • To determine if food intake acts as a synchronizer for cryptdin expression.

Main Methods:

  • Analysis of cryptdin 1 and 4 expression in mouse ileum and jejunum over a circadian cycle.
  • Assessment of cryptdin expression in mice under fasting conditions.
  • Comparison of cryptdin expression between C57BL/6 and FVB/N mouse strains.

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Main Results:

  • Cryptdin expression in FVB/N mice exhibited circadian oscillation, peaking at the end of the dark phase.
  • Oscillation persisted under fasting but with a phase shift, indicating food as a zeitgeber.
  • C57BL/6 mice showed higher cryptdin levels than FVB/N mice, potentially linked to impaired maturation and susceptibility to infection.

Conclusions:

  • The biological clock plays a significant role in regulating small intestinal cryptdin expression.
  • Food intake acts as a zeitgeber, synchronizing cryptdin expression.
  • Findings suggest potential implications for human defensin expression patterns, possibly peaking during daytime.