Melatonin / toxicity Cancer Research Results

MEL, Melatonin: Click to Expand ⟱
Features:
Hormone in the body made by pineal gland.
• Melatonin is a potent antioxidant. It neutralizes reactive oxygen species (ROS) and reactive nitrogen species (RNS), which are involved in DNA damage and cancer progression.
• Melatonin has been shown to modulate apoptotic pathways by influencing mitochondrial permeability, cytochrome c release, and caspase activation.
• In several cancer cell models, melatonin appears to promote apoptosis in malignant cells while sparing normal cells.

The most well-known indolamines are serotonin and melatonin, both of which play significant roles in regulating mood, sleep, and overall mental well-being.

Melatonin doses (20 mg to even 40 mg per day), often given as an adjuvant treatment for cancer.
-The plasma half-life of melatonin is generally in the range of approximately 20 to 60 minutes
-It has been suggested that administering melatonin at the appropriate phase of the circadian cycle may enhance its anti-tumor activity and reduce the side effects of chemotherapy and radiation therapy.

Bio-availability: Oral melatonin has a low and variable bio-availability (often estimated between 3% and 33%), which means that only a fraction of the ingested dose reaches the bloodstream unchanged.

For proOxidant effect might need >10uM, which might be 100mg dose (assuming 10% bio-availability) Might also be required X10 levels?
-It remains unknown whether the pro-oxidant action exists in vivo. the vast majority of evidence indicates that melatonin is a potent antioxidant in vivo even at pharmacological concentrations.

Interactions:
-Melatonin could potentially add to the blood pressure–lowering properties of antihypertensive drugs.
-Patients using insulin should be monitored for changes in blood glucose levels.
-Melatonin might interact with drugs like warfarin, aspirin, or clopidogrel.(antiplatelet)


Melatonin Cancer Relevant Pathways
Rank Pathway / Axis Cancer Cells Normal Cells Label Primary Interpretation Notes
1 Circadian signaling (MT1 / MT2 receptors) ↓ proliferative circadian disruption ↑ circadian synchronization Driver Chronobiology normalization Melatonin restores circadian control; cancer cells lose growth advantages from circadian dysregulation
2 Reactive oxygen species (ROS) ↓ ROS (baseline); context-dependent ↑ stress signaling ↓ ROS (strong buffering) Driver Antioxidant dominance with signaling effects Melatonin is a potent direct and indirect antioxidant; cancer cells may still undergo stress-mediated growth inhibition
3 Mitochondrial function ↓ metabolic flexibility; ↑ apoptosis sensitivity ↑ mitochondrial efficiency Secondary Mitochondrial stabilization vs vulnerability Melatonin improves mitochondrial function in normal cells while limiting metabolic plasticity in cancer cells
4 Estrogen signaling (ERα modulation) ↓ estrogen-driven proliferation ↔ minimal Secondary Hormone-dependent growth suppression Particularly relevant in breast and hormone-responsive cancers
5 NF-κB signaling ↓ inflammatory / survival signaling ↓ inflammatory tone Secondary Anti-inflammatory modulation NF-κB suppression contributes to reduced tumor-promoting inflammation
6 Cell cycle regulation ↓ proliferation / ↑ arrest ↔ spared Phenotypic Cytostatic growth control Growth inhibition reflects upstream circadian and hormonal effects
7 Apoptosis sensitivity ↑ sensitivity to apoptosis (chemo/RT) ↓ apoptosis Phenotypic Therapy sensitization Melatonin enhances response to chemo- and radiotherapy while protecting normal tissue


toxicity, toxicity: Click to Expand ⟱
Source:
Type:
Toxicity
Scientific Papers found: Click to Expand⟱
1780- MEL,    Utilizing Melatonin to Alleviate Side Effects of Chemotherapy: A Potentially Good Partner for Treating Cancer with Ageing
- Review, Var, NA
*antiOx↑, Melatonin is a potent antioxidant and antiageing molecule, is nontoxic, and enhances the efficacy and reduces the side effects of chemotherapy.
*toxicity↓,
ChemoSen↑,
*eff↑, melatonin was superior in preventing free radical destruction compared to other antioxidants, vitamin E, β-carotene, vitamin C, and garlic oil
*mitResp↑, increasing the expression and activity of the mitochondrial respiration chain complexes
*ATP↑, increasing the expression and activity of the mitochondrial respiration chain complexes
*ROS↓, most attractive property of melatonin is that its metabolites also regulate the mitochondrial redox status by scavenging ROS and RNS
*CardioT↓, melatonin has a protective effect on the heart without affecting DOX's antitumor activity,
*GSH↑, improving the de novo synthesis of glutathione (GSH) by promoting the activity of gamma-glutamylcysteine synthetase
*NOS2↓, melatonin inhibits the production of nitric oxide synthase (NOS)
*lipid-P↓, lipid peroxidation was reduced after melatonin treatment (role in induces organ failure)
eff↑, but it also enhances its antitumor activity more than vitamin E
*HO-1↑, melatonin upregulates heme oxygenase-1 (HO-1) (role in induces organ failure)
*NRF2↑, decreased bladder injury and apoptosis due to the upregulation of Nrf2 and nuclear transcription factor NF-κB expression
*NF-kB↑,
TumCP↓, significantly reduced cell proliferation
eff↑, Pretreatment with melatonin effectively preserved the ovaries from cisplatin-induced injury
neuroP↑, Melatonin has neuroprotective roles in oxaliplatin-induced peripheral neuropathy


Showing Research Papers: 1 to 1 of 1

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 1

Pathway results for Effect on Cancer / Diseased Cells:


Migration(tgid=13) ⓘ

TumCP↓, 1,  

Drug Metabolism & Resistance(tgid=21) ⓘ

ChemoSen↑, 1,   eff↑, 2,  

Functional Outcomes(tgid=23) ⓘ

neuroP↑, 1,  
Total Targets: 4

Pathway results for Effect on Normal Cells:


Redox & Oxidative Stress(tgid=1) ⓘ

antiOx↑, 1,   GSH↑, 1,   HO-1↑, 1,   lipid-P↓, 1,   NRF2↑, 1,   ROS↓, 1,  

Mitochondria & Bioenergetics(tgid=3) ⓘ

ATP↑, 1,   mitResp↑, 1,  

Immune & Inflammatory Signaling(tgid=16) ⓘ

NF-kB↑, 1,  

Drug Metabolism & Resistance(tgid=21) ⓘ

eff↑, 1,  

Clinical Biomarkers(tgid=22) ⓘ

NOS2↓, 1,  

Functional Outcomes(tgid=23) ⓘ

CardioT↓, 1,   toxicity↓, 1,  
Total Targets: 13

Scientific Paper Hit Count for: toxicity, toxicity
Query results interpretion may depend on "conditions" listed in the research papers.
Such Conditions may include : 
  -low or high Dose
  -format for product, such as nano of lipid formations
  -different cell line effects
  -synergies with other products 
  -if effect was for normal or cancerous cells

Filter Conditions: Pro/AntiFlg:%  IllCat:%  CanType:%  Cells:%  prod#:122  Target#:1025  State#:%  Dir#:1
  wNotes=on  sortOrder:rid,rpid

 

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