Melatonin dependency

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Melatonin Dependency: Insights from Recent Research

Time-Dependent Melatonin Analgesia

Analgesic Effects and Diurnal Variation

Research has shown that melatonin exhibits significant time-dependent analgesic effects. In a study involving mice, melatonin-induced analgesia was found to be most effective during the late evening hours, specifically around 20:00 h. This time-dependent effect aligns with the natural diurnal variation in pain threshold, which increases during the dark phase of the daily photoperiod .

Interaction with Opiate and Benzodiazepine Antagonists

The analgesic effects of melatonin can be inhibited by the administration of opiate antagonist naloxone and central-type benzodiazepine (BZP) antagonist Ro 15-1788. These antagonists, when administered at 20:00 h, were able to blunt the analgesic response to melatonin, indicating that melatonin's analgesic properties are sensitive to opioid and BZP pathways .

Time-Dependent Hypnotic Effects of Melatonin

Sleep Propensity and Sleep-Wake Regulation

Melatonin also exhibits time-dependent hypnotic effects. A study involving young adults demonstrated that the administration of 5 mg melatonin significantly increased sleep propensity and subjective sleepiness, particularly when administered in the evening hours. The latency to maximum hypnotic effect varied from 3 hours 40 minutes at noon to just 1 hour at 21:00 h, suggesting that melatonin's effectiveness in promoting sleep is highly time-dependent . This supports the hypothesis that endogenous melatonin plays a crucial role in sleep-wake regulation.

Melatonin in Myocardial Ischemia-Reperfusion Injury

Protective Role and Dose-Dependent Effects

Melatonin has been found to have protective effects against myocardial ischemia-reperfusion injury, a critical issue in patients undergoing coronary artery bypass grafting (CABG) surgery. In a clinical study, patients treated with melatonin showed significant improvements in cardiac function, including increased ejection fraction and reduced heart rate. Additionally, melatonin treatment led to a significant reduction in markers of oxidative stress, inflammation, and apoptosis, such as cardiac Troponin-I, interleukin-1beta, inducible nitric oxide synthase, and caspase-3 enzymes . These protective effects were dose-dependent, with higher doses of melatonin yielding more pronounced benefits.

Conclusion

The research highlights the significant time-dependent effects of melatonin on both analgesia and sleep regulation. Melatonin's interaction with opioid and benzodiazepine pathways underscores its complex mechanism of action. Additionally, melatonin's protective role in myocardial ischemia-reperfusion injury suggests its potential therapeutic benefits in clinical settings. Understanding these time-dependent effects and interactions is crucial for optimizing melatonin use in both medical and therapeutic contexts.

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Most relevant research papers on this topic

Time-dependent melatonin analgesia in mice: inhibition by opiate or benzodiazepine antagonism.

Time-dependent melatonin analgesia in mice is sensitive to opioid or central-type benzodiazepine antagonism, with its effects being blunted by these drugs.

1991·

135citations

·D. Golombek et al.

European journal of pharmacology·

DOI

Exogenous application of melatonin to plants, algae, and harvested products to sustain agricultural productivity and enhance nutritional and nutraceutical value: A meta-analysis.

Exogenous melatonin application significantly increases crop productivity and enhances the nutritional and nutraceutical value of edible plant products and algae, with potential for sustainable food and feed production.

Meta-Analysis

2021·

40citations

·Evgenios Agathokleous et al.

Environmental research·

DOI

Melatonin possesses time-dependent hypnotic effects.

Melatonin has a time-dependent hypnotic effect, increasing sleep propensity and subjective sleepiness when administered at various times, suggesting its role in sleep-wake regulation.

RCT

1994·

211citations

·O. Tzischinsky et al.

Sleep·

DOI

Melatonin effects on myocardial ischemia-reperfusion injury: Impact on the outcome in patients undergoing coronary artery bypass grafting surgery.

Melatonin supplementation can reduce the degree of myocardial ischemia-reperfusion injury in patients undergoing coronary artery bypass grafting, with dose-dependent effects.

RCTRigorous Journal

2016·

110citations

·Karar H Dwaich et al.

International journal of cardiology·

DOI

Evidence for the efficacy of melatonin in the treatment of primary adult sleep disorders.

Exogenous melatonin shows promising evidence in reducing sleep onset latency in primary insomnia, delayed sleep phase syndrome, and regulating sleep-wake patterns in blind patients compared to placebo.

Meta-Analysis

2017·

351citations

·F. Auld et al.

Sleep medicine reviews·

DOI

Adverse events associated with oral administration of melatonin: A critical systematic review of clinical evidence.

Oral melatonin supplementation has a generally favorable safety profile, with minor, short-lived adverse events affecting fatigue, mood, and psychomotor and neurocognitive performance.

Systematic Review

2019·

124citations

·H. Foley et al.

Complementary therapies in medicine·

DOI

A review of sleep disorders and melatonin

Melatonin supplementation offers an effective alternative treatment for sleep disorders with fewer side effects than current pharmaceutical therapies.

Literature Review

2017·

340citations

·Zizhen Xie et al.

Neurological Research·

DOI

Phase-dependent treatment of delayed sleep phase syndrome with melatonin.

Melatonin effectively advances sleep and circadian phase in patients with delayed sleep phase syndrome, with earlier administration being more effective.

RCT

2005·

211citations

·K. Mundey et al.

Sleep·

DOI

Sleep-facilitating effect of exogenous melatonin in healthy young men and women is circadian-phase dependent.

Exogenous melatonin improves sleep efficiency in healthy young men and women, with circadian-phase-dependent hypnotic properties, but not in sleep episodes occurring during the circadian night.

RCT

2006·

180citations

·J. Wyatt et al.

Sleep·

DOI

Melatonin in patients with reduced REM sleep duration: two randomized controlled trials.

Melatonin, when administered at the appropriate time, significantly increases REM sleep duration and improves daytime dysfunction in patients with reduced REM sleep duration.

RCT

2004·

134citations

·D. Kunz et al.

The Journal of clinical endocrinology and metabolism·

DOI

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