Depletion of tumor suppressor Kank1 induces centrosomal amplification via hyperactivation of RhoA
| Autor: | Takunori Ogaeri, Jun-ichiro Suzuki, Naoto Kakinuma, Badal C. Roy, Ryoiti Kiyama |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
rho GTP-Binding Proteins RHOA Cell division Carcinogenesis Biology medicine.disease_cause 03 medical and health sciences Mice 0302 clinical medicine Chromosome instability Chromosomal Instability Chromosome Segregation Neoplasms medicine Animals Humans Small GTPase Adaptor Proteins Signal Transducing Aurora Kinase A Centrosome DAAM1 Tumor Suppressor Proteins Microfilament Proteins Cell Biology Cell biology Cytoskeletal Proteins 030104 developmental biology HEK293 Cells 030220 oncology & carcinogenesis Gene Knockdown Techniques Cancer cell biology.protein NIH 3T3 Cells rhoA GTP-Binding Protein Cytokinesis Cell Division |
| Zdroj: | Experimental cell research. 353(2) |
| ISSN: | 1090-2422 |
| Popis: | Chromosome instability, frequently found in cancer cells, is caused by a deficiency in cell division, including centrosomal amplification and cytokinesis failure, and can result in abnormal chromosome content or aneuploidy. The small GTPase pathways have been implicated as important processes in cell division. We found that knockdown of a tumor suppressor protein Kank1 increases the number of cells with a micronucleus or bi-/multi-nuclei, which was likely caused by centrosomal amplification. Kank1 interacts with Daam1, known to bind to and activate a small GTPase, RhoA, in actin assembly. Knockdown of Kank1 or overexpression of Daam1, respectively, hyperactivates RhoA, potentially leading to the modulation of the activity of Aurora-A, a key regulator of centrosomal functions, eventually resulting in centrosomal amplification. Kank1 is also associated with contractile ring formation in collaboration with RhoA, and its deficiency results in the interruption of normal daughter cell separation, generating multinucleate cells. Such abnormal segregation of chromosomes may cause further chromosomal instability and abnormal gene functions, leading to tumorigenesis. Thus, Kank1 plays a crucial role in regulating the activity of RhoA through retrieving excess Daam1 and balancing the activities of RhoA and its effectors. |
| Databáze: | OpenAIRE |
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