Melatonin and Breast Cancer

Dr. Weeks’ Comment:  Melatonin picks up the all-important sulfate group from heparin sulfate which is generated daily from light metabolism via the pineal gland  and transports it as melatonin sulfate through the cerebral spinal fluid to nourish the brain and reduce cancer and Alzheimer’s and autism. (Sulfate help detox) Now we learn that melatonin also remedies the breast cancer STEM cell – the true target of wise oncologists.



Melatonin decreases estrogen receptor binding to estrogen response elements sites on the OCT4 gene in human breast cancer STEM cells
DOI: 10.18632/genesandcancer.107

Juliana Lopes1, et al

Received: April 26, 2016 Accepted: June 08, 2016 Published: June 10, 2016


Cancer stem cells (CSCs) pose a challenge in cancer treatment, as these cells can drive tumor growth and are resistant to chemotherapy. Melatonin exerts its oncostatic effects through the estrogen receptor (ER) pathway in cancer cells, however its action in CSCs is unclear. Here, we evaluated the effect of melatonin on the regulation of the transcription factor OCT4 (Octamer Binding 4) by estrogen receptor alpha (ERα) in breast cancer stem cells (BCSCs). The cells were grown as a cell suspension or as anchorage independent growth, for the mammospheres growth, representing the CSCs population and treated with 10 nM estrogen (E2) or 10 µM of the environmental estrogen Bisphenol A (BPA) and 1 mM of melatonin. At the end, the cell growth as well as OCT4 and ERα expression and the binding activity of ERα to the OCT4 was assessed. The increase in number and size of mammospheres induced by E2 or BPA was reduced by melatonin treatment. Furthermore, binding of the ERα to OCT4 was reduced, accompanied by a reduction of OCT4 and ERα expression. Thus, melatonin treatment is effective against proliferation of BCSCs in vitro and impacts the ER pathway, demonstrating its potential therapeutic use in breast cancer.

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