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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
Exit from arsenite-induced mitotic arrest is p53 dependent
Samuel C McNeely1, Xiaogiang Xu, B Frazier Taylor
1Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky, USA.
Environmental Health Perspectives
|September 13, 2006
Summary
The tumor suppressor p53 helps cells exit mitosis after arsenite exposure. This process involves increased induction of inhibitor of DNA binding-1 (ID1), potentially impacting arsenic carcinogenicity.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Arsenic is a known human carcinogen and a chemotherapeutic agent, but its mechanisms remain unclear.
- The role of p53 in arsenic's effects on cell division and death is not well understood.
- Previous studies showed arsenite disrupts mitosis and that p53-deficient cells are more sensitive to its effects.
Purpose of the Study:
- To investigate the protective role of p53 against arsenite-induced mitotic arrest.
- To understand how p53 influences cell cycle progression following arsenite exposure.
Main Methods:
- Synchronized p53-expressing (p53(+)) and p53-deficient (p53(-)) cells were treated with sodium arsenite.
- Mitotic index analysis was used to assess cell cycle progression.
- Microarray and immunoblotting were employed to analyze gene expression, specifically inhibitor of DNA binding-1 (ID1).
Main Results:
- Arsenite delayed G2 phase exit in both p53(+) and p53(-) cells.
- p53(+) cells exited mitosis more efficiently than p53(-) cells.
- Arsenite induced ID1 expression more extensively and persistently in p53(+) cells compared to p53(-) cells.
Conclusions:
- p53 facilitates mitotic exit in cells exposed to arsenite.
- p53 enhances arsenite-induced ID1 expression.
- ID1 may contribute to cell survival in arsenite-treated cells and play a role in arsenic-induced carcinogenesis.
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