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Related Experiment Video

Updated: Apr 11, 2026

Using Mouse Mammary Tumor Cells to Teach Core Biology Concepts: A Simple Lab Module
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Melatonin antiproliferative effects require active mitochondrial function in embryonal carcinoma cells.

Rute Loureiro1, Silvia Magalhães-Novais1,2, Katia A Mesquita1,2

  • 1CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.

Oncotarget
|May 31, 2015
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Summary

Melatonin

Keywords:
cancer stem cellsdichloroacetatemelatoninmetabolismmitochondria

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Area of Science:

  • Cancer Biology
  • Cell Metabolism
  • Pharmacology

Background:

  • Melatonin exhibits oncostatic and cytotoxic effects in cancer cells.
  • The precise mechanisms and metabolic context of melatonin's antitumoral actions require further elucidation.

Purpose of the Study:

  • To investigate the impact of melatonin on P19 embryonal carcinoma stem cells (CSCs) and their differentiated cells.
  • To explore the role of cellular metabolism (glycolysis vs. mitochondrial oxidative metabolism) in mediating melatonin's effects.

Main Methods:

  • Culturing P19 CSCs and differentiated cells in high glucose or galactose (glucose-free) media.
  • Assessing cell proliferation, cell cycle progression, oxygen consumption, gene expression (BCL-2), and cell death pathways.
  • Evaluating the synergistic effects of melatonin combined with dichloroacetate (DCA).

Main Results:

  • Highly glycolytic P19 CSCs showed reduced susceptibility to melatonin's antitumoral effects compared to cells with higher oxidative metabolism.
  • Melatonin treatment led to S-phase arrest, reduced oxygen consumption, decreased BCL-2 expression, and caspase-3-independent cell death.
  • Combined melatonin and DCA treatment exhibited synergistic effects in galactose medium and inhibited resistant P19 CSCs.

Conclusions:

  • Melatonin's antiproliferative activity in P19 carcinoma cells is mitochondrially mediated.
  • This mitochondrial action potentiates the effects of dichloroacetate, even in cells with a predominantly glycolytic phenotype.