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Morphine administration and abrupt cessation alter the behavioral diurnal activity pattern.

Andrea M Glaser1, Cruz Reyes-Vázquez, Bertha Prieto-Gómez

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Area of Science:

  • Chronobiology
  • Neuropharmacology
  • Mammalian Physiology

Background:

  • Circadian rhythms regulate essential biological functions like metabolism, homeostasis, and immunity in mammals.
  • Limited research exists on the impact of continuous opiate administration on circadian activity patterns.
  • Understanding morphine's long-term effects is crucial due to its widespread prescription and abuse.

Purpose of the Study:

  • To investigate the long-term effects of morphine on the 24-hour activity patterns of rats.
  • To examine activity changes following abrupt morphine withdrawal.
  • To establish a model for demonstrating the long-term impact of opiate drugs.

Main Methods:

  • Male Sprague-Dawley rats were housed under standard light/dark cycles.
  • Activity was recorded before, during, and after morphine pellet implantation.
  • Cosinor analysis was employed to model 24-hour activity patterns.

Main Results:

  • Morphine administration altered the mesor, amplitude, and daytime/nighttime activity levels.
  • A significant shift in maximal circadian rhythm timing was observed during the withdrawal period.
  • The study provides evidence of morphine's disruptive influence on circadian regulation.

Conclusions:

  • Morphine significantly disrupts mammalian circadian rhythms, impacting activity levels and timing.
  • Withdrawal from morphine induces notable alterations in circadian activity patterns.
  • Further research is needed to determine if morphine alters circadian rhythms or if altered rhythms contribute to tolerance and withdrawal.