Video Experimental Relacionado
Updated: May 7, 2026
12:19
Analysis of Cell Cycle Position in Mammalian Cells
Published on: January 21, 2012
Mejora del crecimiento de ratones que carecen de la función inhibidora de la cinasa dependiente de la ciclina de p27
H Kiyokawa1, R D Kineman, K O Manova-Todorova
1Program in Molecular Biology, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
Cell
|May 31, 1996
Resumen
La interrupción del dominio inhibidor de la cinasa dependiente de la ciclina de la proteína p27 en ratones mejora significativamente el crecimiento al aumentar la proliferación celular. Esta interrupción también causa hiperplasia pituitaria y disfunción endocrina, incluida la infertilidad en las mujeres.
Área de la Ciencia:
- Biología celular Biología celular.
- Endocrinología Endocrinología.
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- p27 es un regulador clave de la progresión del ciclo celular y un supresor de tumores.
- Su dominio inhibidor de la cinasa dependiente de la ciclina es crucial para su función.
- Comprender el papel de p27 en la fisiología normal es esencial.
Objetivo del estudio:
- Investigar las consecuencias fisiológicas de interrumpir el dominio inhibidor de la cinasa dependiente de la ciclina de p27.7.
- Para determinar el impacto en el crecimiento general, la proliferación celular y la función endocrina.
Principales métodos:
- Generación de ratones genéticamente modificados con un dominio inhibidor de la cinasa dependiente de la ciclina p27 interrumpido.
- Análisis de los parámetros de crecimiento, la histología del tejido (hipófisis) y los niveles hormonales (hormona del crecimiento, IGF-I).
- Evaluación de la función reproductiva y la ciclicidad del estro en ratones hembras.
Principales resultados:
- La interrupción del dominio inhibidor de p27 condujo a un mayor crecimiento del ratón.
- Se observó un aumento de la proliferación celular, particularmente en los tejidos con alta expresión de p27.
- La hiperplasia nodular del lóbulo intermedio pituitario se produjo sin aumento de la hormona del crecimiento o IGF-I.
- Las ratas hembras exhibieron infertilidad, deterioro de la diferenciación de las células lúteas y ciclos de estro desordenados, lo que indica una alteración del eje hipotálamo-hipófisis-ovario.
Conclusiones:
- El dominio inhibidor de la cinasa dependiente de la ciclina de p27 es crítico para regular la proliferación celular y prevenir la disfunción endocrina.
- La pérdida de la función p27 altera la proliferación celular, lo que lleva a anomalías de la hipófisis y la insuficiencia reproductiva.
- Estos hallazgos resaltan el papel multifacético de p27 más allá del control del ciclo celular, impactando en complejos ejes endocrinos.
Más Videos Relacionados
08:34Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
Published on: April 13, 2015
06:51Utilizing 18F-FDG PET/CT Imaging and Quantitative Histology to Measure Dynamic Changes in the Glucose Metabolism in Mouse Models of Lung Cancer
Published on: July 21, 2018
Videos de Conceptos Relacionados
01:23Negative Regulator Molecules
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.
02:39Positive Regulator Molecules
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.
02:34Inhibition of Cdk Activity
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...
02:23Abnormal Proliferation
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 daughter...
03:03mTOR Signaling and Cancer Progression
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
02:34Inhibition of CDK Activity
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...