Video Experimental Relacionado
Updated: Aug 9, 2026
12:26
Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
CDC25 las fosfatasas como potenciales oncogenes humanos
K Galaktionov1, A K Lee, J Eckstein
1Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, NY 11724, USA.
Science (New York, N.Y.)
|September 15, 1995
Resumen
Las fosfatasas CDC25 activan las cinasas dependientes de la ciclina (CDK). La sobreexpresión de CDC25B en los cánceres de mama humanos sugiere que las fosfatasas CDC25 contribuyen al desarrollo del cáncer humano.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Oncología Oncología.
Sus antecedentes:
- Las cinasas dependientes de ciclina (CDKs) regulan el ciclo celular.
- Las fosfatasas CDC25 activan las CDK eliminando los fosfatos inhibidores.
- La familia genética humana CDC25 incluye CDC25A, CDC25B y CDC25C.
Objetivo del estudio:
- Para investigar el papel de las fosfatasas CDC25 en la transformación oncogénica.
- Para determinar si las fosfatasas CDC25 contribuyen al desarrollo del cáncer humano.
Principales métodos:
- Evaluación de la formación de focos oncogénicos en células de roedores utilizando CDC25A, CDC25B o CDC25C humanos.
- La introducción de la pérdida oncogénica Ha-RASG12V o RB1.
- Analizando las características tumorales en ratones.
- Cuantificación de la expresión de CDC25B en muestras humanas de cáncer de mama.
Principales resultados:
- Los CDC25A y CDC25B humanos, pero no el CDC25C, cooperaron con la pérdida de Ha-RASG12V o RB1 para formar focos oncogénicos en células de roedores.
- Las células transformadas exhibieron aneuploidía, crecimiento de agar suave y formaron tumores de alto grado en ratones desnudos.
- CDC25B fue sobreexpresado en el 32% de los cánceres de mama primarios humanos.
Conclusiones:
- Las fosfatasas CDC25A y CDC25B pueden promover la transformación oncogénica.
- La sobreexpresión de CDC25B en el cáncer de mama sugiere un papel en la tumorigénesis humana.
- Las fosfatasas CDC25 son posibles contribuyentes al desarrollo del cáncer humano.
Videos de Conceptos Relacionados
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.
02:23Abnormal 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...
01:33Cancer-Critical Genes I: Proto-oncogenes
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...
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...
01:20The Retinoblastoma Gene
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.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
01:33Cancer-Critical Genes I: Proto-oncogenes
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...