Video Experimental Relacionado
Updated: Aug 16, 2026

08:54
An Immunofluorescent Method for Characterization of Barrett’s Esophagus Cells
Published on: July 20, 2014
Myc pero no Fos rescate del bloque de señalización de PDGF causado por el Src inactivo por kinasa
1Differentiation Programme, European Molecular Biology Laboratory, Heidelberg, Germany.
Nature
|November 30, 1995
Resumen
El factor de crecimiento derivado de plaquetas (PDGF) estimula el crecimiento celular. Este estudio revela que las Src quinasas controlan la activación de Myc, que es crucial para la síntesis de ADN inducida por PDGF en los fibroblastos.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología molecular La biología molecular.
- Investigación de la investigación del cáncer.
Sus antecedentes:
- Los factores de crecimiento como el PDGF activan genes tempranos inmediatos, incluidos los factores de transcripción AP1 y Myc, que son vitales para la proliferación de los fibroblastos.
- Las quinasas de la familia Src son esenciales para la síntesis de ADN inducida por PDGF.
Objetivo del estudio:
- Investigar qué factores de transcripción, cuando se expresan constitutivamente, pueden superar el efecto inhibidor del Src. negativo dominante.
- Aclarar el papel de las Src quinasas en la activación transcripcional mediada por el factor de crecimiento.
Principales métodos:
- Expresión de Src y Ras dominantes negativos en los fibroblastos.
- Expresión constitutiva de los factores de transcripción Myc, Fos y Jun.
- Evaluación de la síntesis del ADN y la activación de genes.
Principales resultados:
- La expresión constitutiva de Myc rescató el bloqueo de síntesis de ADN inducido por el Src dominante negativo.
- La expresión constitutiva Fos y Jun rescató el bloque inducido por Ras dominante-negativo, pero no por Src dominante-negativo.
- Estos hallazgos indican que las cinasas Src regulan específicamente la activación transcripcional de Myc.
Conclusiones:
- Las cinasas Src juegan un papel crítico en la vía de señalización aguas abajo del PDGF, específicamente controlando la activación del factor de transcripción Myc.
- Comprender esta vía es crucial para comprender la proliferación celular mediada por el factor de crecimiento y tiene implicaciones para la investigación del cáncer.
Videos de Conceptos Relacionados
Abnormal 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...
Amplifying Signals via Enzymatic Cascade
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
Induced Pluripotent Stem Cells
Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
Somatic cells are...
Somatic cells are...

