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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lin, Y-F Lee, Y-F Liang, P-H |
| Description | Author Affiliation: Lin YF ( Institute of Biological Chemistry, Academia Sinica, Taipei 11529, Taiwan, ROC.) |
| Abstract | We have previously demonstrated that interrupting the protein-protein interaction (PPI) of ß-tubulin:chaperonin-containing TCP-1ß (CCT-ß) induces the selective killing of multidrug-resistant cancer cells due to CCT-ß overexpression. However, the molecular mechanism has not yet been identified. In this study, we found that CCT-ß interacts with a myriad of intracellular proteins involved in the cellular functions of the endoplasmic reticulum (ER), mitochondria, cytoskeleton, proteasome and apoptosome. Our data show that the targeted cells activate both the heat-shock protein 90 (Hsp90)-associated protein ubiquitination/degradation pathway to eliminate misfolded proteins in the cytoplasm and the valosin-containing protein (VCP)-centered ER-associated protein degradation pathway to reduce the excessive levels of unfolded polypeptides from the ER, thereby mitigating ER stress, at the onset of ß-tubulin:CCT-ß complex disruption. Once ER stress is expanded, ER stress-associated apoptotic signaling is enforced, as exhibited by cellular vacuolization and intracellular Ca2+ release. Furthermore, the elevated intracellular Ca2+ levels resulting from capacitative Ca2+ entry augments apoptotic signaling by provoking mitochondrial perturbation and caspase overactivation in the targeted cells. These findings not only provide a detailed picture of the apoptotic signaling cascades evoked by targeting the ß-tubulin:CCT-ß complex but also demonstrate a strategy to combat malignancies with chemoresistance to Hsp90- and VCP-related anticancer agents. |
| File Format | HTM / HTML |
| e-ISSN | 20414889 |
| DOI | 10.1038/cddis.2012.173 |
| Journal | Cell Death and Disease |
| Volume Number | 3 |
| Language | English |
| Publisher | Nature Publishing Group |
| Publisher Date | 2012-11-29 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Cell Line Calcium Chaperonin Containing Tcp-1 Hsp90 Heat-shock Proteins Endoplasmic Reticulum-associated Degradation Endoplasmic Reticulum Metabolism Discipline Cell Biology Mitochondria Tubulin Adenosine Triphosphatases Proteolysis Endoplasmic Reticulum Stress Protein Binding Genetics Caspases Cell Cycle Proteins Apoptosis |
| Content Type | Text |
| Resource Type | Article |
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