Video Experimental Relacionado
Updated: May 16, 2026
06:54
Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
Published on: October 27, 2020
COUP-TFII inhibe la barrera de crecimiento inducida por TGF-β para promover la tumorigénesis de la próstata
Jun Qin1, San-Pin Wu, Chad J Creighton
1Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030, USA.
Nature
|December 4, 2012
Resumen
COUP-TFII anula una barrera de crecimiento natural en el cáncer de próstata mutante PTEN, promoviendo la metástasis. La inhibición de COUP-TFII puede ofrecer una nueva estrategia terapéutica para el cáncer de próstata agresivo.
Área de la Ciencia:
- Oncología Oncología.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- El cáncer de próstata a menudo implica mutaciones PTEN o alteraciones en la vía PI3K.
- El mecanismo por el cual los tumores indolentes alterados por PTEN se convierten en metastásicos no está claro.
- La señalización del factor de crecimiento transformador-beta (TGF-β) puede actuar como un punto de control contra la progresión del cáncer de próstata impulsada por PTEN.
Objetivo del estudio:
- Para investigar el papel del factor de transcripción COUP II (COUP-TFII) en la progresión del cáncer de próstata mutante PTEN.
- Aclarar el mecanismo por el cual COUP-TFII influye en la señalización de TGF-β y la metástasis tumoral.
Principales métodos:
- Se utilizaron modelos de ratones modificados genéticamente con deleciones genéticas específicas (PTEN, SMAD4).
- Se analizó la interacción de COUP-TFII con SMAD4 y su efecto en la transcripción dependiente de TGF-β.
- Expresión COUP-TFII correlacionada con los resultados clínicos y la señalización de TGF-β en muestras de pacientes.
Principales resultados:
- COUP-TFII inhibe la transcripción dependiente de SMAD4, anulando la barrera de crecimiento de TGF-β en los tumores PTEN-null.
- La sobreexpresión COUP-TFII coopera con la deleción de PTEN para conducir el cáncer de próstata metastásico y agresivo en ratones.
- La pérdida de SMAD4 contrarresta los efectos inhibidores de la ablación COUP-TFII.
- Una alta expresión de COUP-TFII se correlaciona con la recurrencia y progresión del tumor, e inversamente con la señalización de TGF-β en los pacientes.
Conclusiones:
- COUP-TFII es un regulador clave que desmonta la barrera mediada por TGF-β, lo que permite que el cáncer de próstata mutante PTEN se vuelva metastásico.
- La orientación COUP-TFII presenta una estrategia terapéutica potencial para el tratamiento del cáncer de próstata avanzado y metastásico.
Videos de Conceptos Relacionados
01:16TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
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...
02:23Abnormal 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...
02:38Mitogens and the Cell Cycle
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
01:22PI3K/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...
01:24Regulation of Angiogenesis and Blood Supply
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...