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Techniques to Induce and Quantify Cellular Senescence
Published on: May 1, 2017
Reduced Geminin levels promote cellular senescence
Maria S Iliou1, Panorea Kotantaki, Dimitris Karamitros
1Laboratory of General Biology, School of Medicine, University of Patras, Rio, Patras, Greece.
Mechanisms of Ageing and Development
|November 13, 2012
Summary
Geminin levels influence cellular senescence. Reduced Geminin promotes senescence, while increased Geminin delays it, suggesting Geminin
Area of Science:
- Cellular and Molecular Biology
- Cancer Research
- Aging Research
Background:
- Cellular senescence is a permanent cell cycle arrest state.
- Cdt1 and Geminin are key regulators of DNA replication licensing during the G1 phase.
- Their expression patterns are altered in aging and cancer.
Purpose of the Study:
- To investigate the cell cycle expression of Cdt1 and Geminin in fibroblasts.
- To determine the role of Geminin in regulating cellular senescence.
- To compare expression patterns in normal and tumor-derived cells.
Main Methods:
- Characterization of Cdt1 and Geminin expression during fibroblast passages.
- Comparison with tumor cell lines.
- RNA interference (RNAi)-mediated Geminin knockdown.
- Analysis of senescence phenotypes in Geminin-modified cells.
Main Results:
- Cdt1 and Geminin are expressed in distinct subpopulations of young fibroblasts.
- Expression of both proteins decreases during replicative and stress-induced senescence.
- Geminin knockdown accelerates senescence, while its overexpression delays it.
Conclusions:
- Geminin expression levels are critical for the establishment of senescence pathways.
- Geminin acts as a modulator of cellular senescence.
- Findings provide insights into cell cycle regulation and aging.
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