Video Experimental Relacionado
Updated: May 5, 2026
09:18
A Sensitive Method to Quantify Senescent Cancer Cells
Published on: August 2, 2013
20.4K
La senescencia inducida por oncogenes como barrera inicial en el desarrollo del linfoma
Melanie Braig1, Soyoung Lee, Christoph Loddenkemper
1Charité-Universitätsmedizin Berlin/Haematology-Oncology, 13353 Berlin, Germany.
Nature
|August 5, 2005
Resumen
El Ras oncogénico desencadena la senescencia, un mecanismo supresor de tumores dependiente de Suv39h1 y la metilación de la histona H3 lisina 9 (H3K9me). La inactivación de esta vía conduce a linfomas agresivos, destacando su papel en la prevención del cáncer.
Área de la Ciencia:
- La epigenética y la biología del cáncer.
- Mecanismos de la senescencia celular Los mecanismos de la senescencia celular
- La tumorigénesis y la regulación génica.
Sus antecedentes:
- El Ras oncogénico induce la senescencia celular a través de la vía del retinoblastoma (Rb).
- La metilación de la histona H3 lisina 9 (H3K9me) y la formación de heterocromatina son críticas para la senescencia.
- Se investiga el papel de la histona metiltransferasa Suv39h1 en la senescencia y la supresión tumoral.
Objetivo del estudio:
- Para investigar el potencial supresor de tumores in vivo de la senescencia.
- Para determinar la dependencia de la senescencia inducida por Ras en Suv39h1 y H3K9me.
- Para aclarar el papel de Suv39h1 en la prevención del desarrollo de linfoma.
Principales métodos:
- Se utilizaron ratones transgénicos Emicro-N-Ras con lesiones dirigidas en Suv39h1 o p53.
- Se analizó el desarrollo y las características del linfoma en ratones de tipo salvaje y knockout.
- Evaluó la senescencia celular y las respuestas de apoptosis a la Ras oncogénica y a la terapia farmacológica.
Principales resultados:
- La deficiencia de Suv39h1 o p53 en ratones transgénicos N-Ras condujo a linfomas invasivos de células T.
- Los ratones de tipo salvaje desarrollaron una neoplasia no linfática más tarde, con una senescencia dependiente de Suv39h1 que detuvo la linfomagénesis.
- Los linfomas deficientes de Suv39h1 crecían rápidamente, pero seguían siendo susceptibles a la apoptosis, a diferencia de los deficientes de p53.
Conclusiones:
- La senescencia mediada por H3K9me es un nuevo mecanismo supresor de tumores dependiente de Suv39h1.
- La inactivación de Suv39h1 permite la formación de linfomas agresivos en respuesta al Ras. oncogénico.
- La senescencia actúa como una barrera crucial contra la linfomagénesis temprana.
Videos de Conceptos Relacionados
02:15Replicative Cell Senescence
3.5K
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
3.5K
02:21Cancers Originate from Somatic Mutations in a Single Cell
12.6K
Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
12.6K
01:33Cancer-Critical Genes I: Proto-oncogenes
9.1K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
9.1K
01:12Loss of Tumor Suppressor Gene Functions
4.9K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
4.9K
01:05Cancer-Critical Genes II: Tumor Suppressor Genes
8.3K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
8.3K
01:31The Intrinsic Apoptotic Pathway
6.2K
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
6.2K