Video Experimental Relacionado
Updated: May 6, 2026
10:04
Establishment of Proliferative Tetraploid Cells from Nontransformed Human Fibroblasts
Published on: January 8, 2017
6.8K
El fallo de la citocinesis que genera tetraploides promueve la tumorigénesis en las células p53-null
Takeshi Fujiwara1, Madhavi Bandi, Masayuki Nitta
1Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|October 14, 2005
Resumen
La falla en la división celular crea células tetraploides, promoviendo la inestabilidad genética y el cáncer. Las células tetraploides, pero no las células diploides, se desarrollaron en tumores mamarios malignos, demostrando tetraploidía.
Área de la Ciencia:
- Oncología Oncología.
- Biología celular Biología celular.
- Genética La genética.
Sus antecedentes:
- Se supone que la tumorigénesis implica fallas en la división celular que conducen a células tetraploides genéticamente inestables.
- Las células tetraploides pueden facilitar el desarrollo de tumores malignos aneuploides.
Objetivo del estudio:
- Para probar la hipótesis de que el fracaso de la división celular y la posterior tetraploidía promueven la tumorigénesis.
- Para investigar el papel de la tetraploidía en la inestabilidad cromosómica y la transformación maligna.
Principales métodos:
- Bloqueo transitorio de la citocinesis en las células epiteliales mamarias de ratón p53-nulo (MMEC) para aislar cultivos diploides y tetraploides.
- Evaluación de la inestabilidad cromosómica (segregación errónea, reordenamientos) en ambos tipos celulares.
- Evaluar la transformación in vitro después de la exposición a carcinógenos y la tumorigenicidad in vivo después del trasplante subcutáneo en ratones desnudos.
Principales resultados:
- Las MMEC tetraploides exhibieron un aumento de la segregación errónea de cromosomas enteros y reordenamientos cromosómicos en comparación con las células diploides.
- Sólo las células tetraploides fueron sometidas a transformación in vitro después de la exposición a carcinógenos.
- Las células tetraploides trasplantadas, pero no las células diploides, formaron cánceres epiteliales mamarios malignos, caracterizados por translocaciones y amplificación génica de la metaloproteinasa de matriz (MMP).
Conclusiones:
- La tetraploidía aumenta significativamente la frecuencia de las alteraciones cromosómicas en los MMEC p53-nulo.
- La tetraploidía es un factor crítico que promueve el desarrollo de cánceres epiteliales mamarios malignos.
- Los hallazgos apoyan la hipótesis de larga data que vincula el fracaso de la división celular, la tetraploidía y la tumorigénesis.
Videos de Conceptos Relacionados
01:23Negative Regulator Molecules
32.1K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
32.1K
02:36DNA Damage can Stall the Cell Cycle
8.5K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
8.5K
02:39Positive Regulator Molecules
5.3K
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
5.3K
02:34Inhibition of Cdk Activity
4.8K
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
4.8K
02:23Abnormal Proliferation
4.0K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.0K
02:36DNA Damage Can Stall the Cell Cycle
2.4K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
2.4K