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Flow Cytometric Analysis of Mitochondrial Reactive Oxygen Species in Murine Hematopoietic Stem and Progenitor Cells and MLL-AF9 Driven Leukemia
Published on: September 5, 2019
Melatonin cytotoxicity in human leukemia cells: relation with its pro-oxidant effect
Mustafa Büyükavci1, Oner Ozdemir, Steven Buck
1Division of Hematology/Oncology, Children's Hospital of Michigan, Barbara Ann Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA.
Fundamental & Clinical Pharmacology
|February 2, 2006
Summary
Melatonin exhibits dual antioxidant and oxidant effects in leukemia cells. At higher concentrations, it generates reactive oxygen species (ROS), potentially limiting leukemic cell growth without stimulating proliferation.
Area of Science:
- Biochemistry
- Oncology
- Cell Biology
Background:
- Melatonin is a hormone with diverse physiological roles, including involvement in neoplastic processes.
- While often recognized for antioxidant properties, melatonin can exert oxidant effects, particularly in cancer cells.
Purpose of the Study:
- To investigate the impact of melatonin on human leukemia cells.
- To evaluate melatonin's cytotoxic and pro-oxidant effects on various leukemia cell lines.
Main Methods:
- Treatment of human leukemia cell lines (CMK, Jurkat, MOLT-4, HL-60, K562, Daudi) with melatonin at concentrations of 10(-5) M and 10(-3) M.
- Assessment of cell viability, reactive oxygen species (ROS) generation, lipid peroxidation, cell cycle kinetics, and apoptosis.
Main Results:
- Melatonin (10(-3) M) induced moderate cytotoxicity and significant ROS generation in CMK, Jurkat, and MOLT-4 cells.
- Increased ROS generation was observed in HL-60 cells without significant cytotoxicity; K562 and Daudi cells showed no significant effects.
- Melatonin primarily affected CMK cells, increasing apoptosis and influencing lipid peroxidation, while cell cycle kinetics remained largely unaffected across cell lines.
Conclusions:
- Melatonin induces ROS production in a concentration-dependent manner in certain leukemia cells, potentially leading to cytotoxicity.
- Melatonin does not appear to stimulate leukemia cell proliferation, and its pro-oxidant actions may contribute to limiting leukemic cell growth.
