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Antiproliferative effect and cell cycle modulation by melatonin on GH(3) cells
1Experimental Endocrinology Laboratory, Department of Endocrinology, Research Institute, Hospital de Sant Pau, Autonomous University of Barcelona, Spain.
Hormone Research
|January 11, 2001
Summary
Melatonin significantly reduces GH(3) rat pituitary cell proliferation by 50%. This study shows melatonin
Area of Science:
- Endocrinology
- Cell Biology
- Molecular Biology
Background:
- The GH(3) rat pituitary cell line is a model for studying cell proliferation.
- Melatonin is a hormone with potential roles in cell growth regulation.
Purpose of the Study:
- To investigate the effect of melatonin on GH(3) cell proliferation.
- To analyze the expression of oncogenes (c-myc, c-jun) and tumor suppressor gene (p53) in response to melatonin.
Main Methods:
- GH(3) cells were exposed to varying concentrations of melatonin (10(-6) to 10(-10) M).
- Cell proliferation was assessed using proliferation markers (Ki67, Proliferation cell nuclear antigen).
- Gene expression analysis for c-myc, c-jun, and p53 was performed.
Main Results:
- Melatonin demonstrated a dose-dependent antiproliferative effect, reducing cell proliferation by 50%.
- Acute and chronic exposure to melatonin decreased Ki67 and Proliferation cell nuclear antigen expression.
- Melatonin modulated c-myc, c-jun, and p53 gene expression, with c-myc and c-jun decreasing and p53 increasing.
Conclusions:
- Melatonin exerts an antiproliferative effect on GH(3) rat pituitary cells.
- Melatonin modulates key genes involved in cell proliferation and cell cycle regulation.