Skip Navigation


ToxSci Advance Access originally published online on December 7, 2005
Toxicological Sciences 2006 90(1):73-86; doi:10.1093/toxsci/kfj070
This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow Supplementary Data
Right arrow All Versions of this Article:
90/1/73    most recent
kfj070v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (4)
Right arrowRequest Permissions
Right arrow Disclaimer
Google Scholar
Right arrow Articles by Chao, J.-I
Right arrow Articles by Tsou, T.-C.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Chao, J.-I
Right arrow Articles by Tsou, T.-C.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author 2005. Published by Oxford University Press on behalf of the Society of Toxicology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Depletion of Securin Increases Arsenite-Induced Chromosome Instability and Apoptosis via a p53-Independent Pathway

Jui-I Chao*,1, Shih-Hsin Hsu* and Tsui-Chun Tsou{dagger}

* Molecular Anticancer Laboratory, Institute of Pharmacology and Toxicology, College of Life Sciences, Tzu Chi University, Hualien, Taiwan; and {dagger} Division of Environmental Health and Occupational Medicine, National Health Research Institutes, Kaohsiung, Taiwan

Received August 27, 2005; accepted November 23, 2005

Arsenic is a pathologic factor of cardiovascular diseases and cancers; nevertheless, it also acts as an anticancer agent effective on acute promyelocytic leukemia and multiple myeloma. Securin, a proposed proto-oncogene, regulates cell proliferation and tumorigenesis. However, roles of securin on the arsenic-induced cell cycle arrest and apoptosis remain unknown. In this study, the effects of sodium arsenite on the expression of securin in two tissue types of cell lines, the vascular endothelial and colorectal epithelial cells, were investigated. Arsenite (8–16 µM, 24 h) increased the cytotoxicity, apoptosis, and growth inhibition in both endothelial and epithelial cells. The levels of phospho-CDC2 (threonine-161), CDC2, and cyclin B1 proteins were decreased, and the G2/M fractions were increased by arsenite. Concomitantly, arsenite markedly diminished the securin protein expression and induced the abnormal sister chromatid separation. The depletion of securin proteins increased the induction of mitotic arrest, aberrant chromosome segregation, and apoptosis after arsenite treatment. p53, a tumor suppressor protein, balances the cell survival and apoptosis. Arsenite raised the levels of phospho-p53 (serine-15) and p53 (DO-1) proteins in both the securin-wild-type and -null cells. The p53-functional cells were more susceptible than the p53-mutational cells to arsenite on the cytotoxicity and apoptosis. Besides, arsenite decreased the levels of securin proteins to a similar degree in both the p53-functional and -mutational cells. Together, it is the first time to demonstrate that the inhibition of securin expression induced by arsenite increases the chromosomal instability and apoptosis via a p53-independent pathway.

Key Words: arsenite; apoptosis; securin; separase; mitosis; p53.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Mol. Biol. CellHome page
D. Qiao, X. Yang, K. Meyer, and A. Friedl
Glypican-1 Regulates Anaphase Promoting Complex/Cyclosome Substrates and Cell Cycle Progression in Endothelial Cells
Mol. Biol. Cell, July 1, 2008; 19(7): 2789 - 2801.
[Abstract] [Full Text] [PDF]

Home page
 J BiochemHome page
J. A. Bernal and A. Hernandez
p53 Stabilization can be Uncoupled from its Role in Transcriptional Activation by Loss of PTTG1/Securin
J. Biochem., May 1, 2007; 141(5): 737 - 745.
[Abstract] [Full Text] [PDF]


Disclaimer:
Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.