Video Experimental Relacionado
Updated: May 5, 2026
08:34
Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
Published on: April 13, 2015
13.3K
Los telómeros disfuncionales cortos deterioran la tumorigénesis en el ratón propenso al cáncer INK4a (delta2/3)
R A Greenberg1, L Chin, A Femino
1Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
Cell
|May 25, 1999
Resumen
El acortamiento de los telómeros perjudica la formación de tumores en ratones que carecen de ARN telomerasa (mTR) e INK4a. La restauración de la mTR restableció el potencial promotor del cáncer, destacando el mantenimiento de los telómeros.
Área de la Ciencia:
- Biología del cáncer Biología del cáncer.
- Genética La genética.
- Envejecimiento celular Envejecimiento celular.
Sus antecedentes:
- El mantenimiento de la longitud de los telómeros es crucial para la supervivencia y la proliferación de las células cancerosas.
- La disfunción de los telómeros puede actuar como una barrera para la tumorigénesis.
- La interacción entre la biología de los telómeros y los genes supresores de tumores es compleja.
Objetivo del estudio:
- Para investigar el impacto de la disfunción de los telómeros en la tumorigénesis en un modelo de ratón.
- Evaluar el papel del ARN telomerasa (mTR) y el INK4a en el desarrollo tumoral.
- Para determinar si la activación de la telomerasa es necesaria para la transformación maligna en células con telómeros críticamente cortos.
Principales métodos:
- Generó generaciones sucesivas de ratones que carecían tanto de ARN telomerasa (mTR) como del gen supresor de tumores INK4a.
- Evaluación de la formación tumoral in vivo y el potencial oncogénico in vitro a través de generaciones.
- Reintroducción de mTR en células deficientes para evaluar la restauración del potencial oncogénico.
Principales resultados:
- Las últimas generaciones de ratones con deficiencia de telomerasa mostraron una reducción significativa de la formación de tumores y el potencial oncogénico.
- Se observó un grave acortamiento y disfunción de los telómeros en estas últimas generaciones.
- La reintroducción de la mTR restauró el potencial oncogénico en células con telómeros críticamente cortos.
Conclusiones:
- La pérdida de la función de los telómeros afecta, pero no previene por completo, la formación de tumores, incluso en modelos propensos al cáncer con respuestas intactas al daño del ADN.
- La activación de la telomerasa coopera con los telómeros críticamente cortos para promover la transformación maligna.
- El mantenimiento de los telómeros es un factor crítico en el desarrollo y la progresión del cáncer.
Más Videos Relacionados
06:09Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
8.6K
10:49A Murine Cell Line Based Model of Chronic CDK9 Inhibition to Study Widespread Non-Genetic Transcriptional Elongation Defects TEdeff in Cancers
Published on: September 26, 2019
5.2K
Videos de Conceptos Relacionados
02:41Telomeres and Telomerase
23.1K
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
23.1K
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
02:23Abnormal 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
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
02:43Mouse Models of Cancer Study
4.7K
Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
The development of transgenic, knockout, and knock-in mice has led to an exponential increase in their use as model organisms in research,...
The development of transgenic, knockout, and knock-in mice has led to an exponential increase in their use as model organisms in research,...
4.7K
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