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Related Concept Videos

Management of Insomnia01:19

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The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
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Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
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Related Experiment Video

Updated: Mar 31, 2026

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The human myometrium as a target for melatonin.

N Schlabritz-Loutsevitch1, N Hellner, R Middendorf

  • 1Institute for Hormone and Fertility Research, University of Hamburg, 22529 Hamburg, Germany.

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|February 8, 2003
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Summary

Melatonin may influence human uterine muscle (myometrial) function, potentially explaining why births often occur at night. This hormone

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Area of Science:

  • Reproductive biology
  • Endocrinology
  • Chronobiology

Background:

  • Spontaneous human deliveries exhibit circadian timing, with more births occurring nocturnally.
  • The precise neuroendocrine mechanisms regulating this circadian pattern remain unclear.
  • Melatonin's role as a potential endocrine signal for myometrial events is hypothesized.

Purpose of the Study:

  • To investigate the presence and function of melatonin receptors (MT1 and MT2) in human myometrium.
  • To determine if melatonin can modulate myometrial cell activity.

Main Methods:

  • Analyzing mRNA expression of MT1 and MT2 melatonin receptors in pregnant and nonpregnant myometrial biopsies using RT-PCR and in situ hybridization.
  • Assessing specific high-affinity iodomelatonin binding in myometrial tissues.
  • Evaluating the response of primary myocyte cultures to melatonin regarding cAMP signaling in different reproductive states.

Main Results:

  • MT1 and MT2 melatonin receptor isoforms were detected in human myometrial biopsies.
  • Specific, high-affinity iodomelatonin binding was confirmed in both pregnant and nonpregnant myometrial tissues.
  • Myocytes exhibited differential responses to melatonin concerning cAMP signaling based on reproductive status.

Conclusions:

  • Melatonin has the potential to modulate human myometrial function.
  • These findings suggest melatonin may play a role in the circadian timing of human childbirth.
  • This research opens avenues for developing novel therapeutic agents targeting myometrial function.