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Senescence-like changes induced by expression of p21(waf1/Cip1) in NIH3T3 cell line
Xi Chen1, Wei Zhang, Yun Fei Gao
1College of Life Sciences, Peking University, Beijing, China.
Abstract:
P21(Waf1/Cip1) is a potent cyclin-dependent kinase inhibitor. As a downstream mediator of p53, p21(Waf1/Cip1) involves in cell cycle arrest, differentiation and apoptosis. Previous studies in human cells provided evidence for a link between p21(Waf1/Cip1) and cellular senescence. While in murine cells, the role of p21(Waf1/Cip1) is indefinite. We explored this issue using NIH3T3 cells with inducible p21(Waf1/Cip1) expression. Induction of p21(Waf1/Cip1) triggered G1 growth arrest, and NIH3T3-p21 cells exhibited morphologic features, such as enlarged and flattened cellular shape, specific to the senescence phenotype. We also showed that p21(Waf1/Cip1)-transduced NIH3T3 cells expressed beta-galactosidase activity at pH 6.0, which is known to be a marker of senescence. Our results suggest that p2l(Waf1/Cip1) can also induce senescence-like changes in murine cells.
Insights
The cyclin-dependent kinase inhibitor p21 (Waf1/Cip1) induces cell cycle arrest and senescence-like changes in murine NIH3T3 cells. This suggests p21 plays a role in cellular senescence across species.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- p21 (Waf1/Cip1) is a key inhibitor of cyclin-dependent kinases, mediating p53's effects on cell cycle arrest, differentiation, and apoptosis.
- Human cell studies link p21 (Waf1/Cip1) to cellular senescence, but its role in murine cells remains unclear.
Purpose of the Study:
- To investigate the role of p21 (Waf1/Cip1) in inducing cellular senescence in murine cells.
- To explore the effects of inducible p21 (Waf1/Cip1) expression in NIH3T3 cells.
Main Methods:
- Utilized NIH3T3 cells engineered for inducible p21 (Waf1/Cip1) expression.
- Monitored cell cycle progression, cellular morphology, and senescence-associated beta-galactosidase activity.
Main Results:
- Induction of p21 (Waf1/Cip1) resulted in G1 phase cell cycle arrest.
- NIH3T3 cells expressing p21 (Waf1/Cip1) displayed enlarged, flattened shapes characteristic of senescence.
- Increased beta-galactosidase activity at pH 6.0 was observed in p21 (Waf1/Cip1)-expressing cells, a marker for senescence.
Conclusions:
- p21 (Waf1/Cip1) can induce cellular senescence-like phenotypes in murine cells.
- The findings suggest a conserved role for p21 (Waf1/Cip1) in regulating senescence across different species.