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Related Experiment Videos

Gastric potential difference in fasted rats: circadian studies

K R Larsen1, J G Moore, M T Dayton

  • 1Department of Medicine, Salt Lake Veterans Affairs Medical Center, Utah 84148.

Chronobiology International
|February 1, 1993
PubMed
Summary

Gastric potential difference (PD) exhibits circadian rhythms in rats, with higher values in the morning. This finding suggests a daily pattern in gastric mucosal function that may influence ulcer development.

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Area of Science:

  • Gastroenterology
  • Chronobiology
  • Physiology

Background:

  • Gastroduodenal ulcer pathophysiology is complex and debated.
  • One model suggests disrupted circadian rhythms of protective and destructive factors.
  • Circadian rhythms in acid secretion and gastric potential difference (PD) have been observed in vitro.

Purpose of the Study:

  • To investigate circadian variations in gastric PD in vivo.
  • To assess PD as a measure of gastric mucosal integrity and protection.
  • To correlate PD fluctuations with the circadian clock in rats.

Main Methods:

  • Sixty-four rats were acclimatized to a 12:12-h light-dark cycle.
  • Gastric PD was measured at eight time points over 24 hours in fasted, anesthetized rats.

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  • Intragastric and peritoneal catheters were used to record stable PD readings.

    • Main Results:

    • Significant circadian rhythmicity in gastric PD was observed.
    • PD values were significantly higher at 07:00 and 10:00 hours after lights on (HALO).
    • The lowest PD values occurred at 13:00 HALO, with a significant difference from morning peaks.

    Conclusions:

    • Gastric potential difference demonstrates significant circadian variation in rats.
    • Morning hours show higher gastric mucosal function, potentially indicating a protective phase.
    • These findings contribute to understanding the chronobiology of gastric mucosal integrity and ulcerogenesis.