Video Experimental Relacionado
Updated: Jun 23, 2026

06:40
Seven Steps to Stellate Cells
Published on: May 10, 2011
La senescencia de las células estelares activadas limita la fibrosis hepática
Valery Krizhanovsky1, Monica Yon, Ross A Dickins
1Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724 USA.
Cell
|August 30, 2008
Resumen
La senescencia celular limita la fibrosis hepática al promover el aclaramiento de las células estelares hepáticas activadas. Este programa de senescencia resuelve las respuestas fibróticas al daño tisular agudo.
Área de la Ciencia:
- Biología celular Biología celular.
- Hepatología Hepatología.
- Inmunología Inmunología.
Sus antecedentes:
- La senescencia celular es un conocido mecanismo supresor de tumores.
- Su papel en patologías no cancerosas, como la fibrosis hepática, sigue siendo en gran parte inexplorado.
Objetivo del estudio:
- Para investigar el papel de la senescencia celular en la fibrosis hepática.
- Identificar los tipos celulares involucrados y su contribución funcional a la resolución de la fibrosis.
Principales métodos:
- Se indujeron modelos murinos de fibrosis hepática.
- Se analizó la acumulación y el origen de las células senescentes.
- Se examinaron los perfiles de expresión génica de las células senescentes.
- Se evaluó la actividad de las células asesinas naturales contra las células senescentes.
Principales resultados:
- Las células senescentes, principalmente las células estelares hepáticas activadas, se acumulan durante la fibrosis hepática.
- La pérdida de los reguladores de la senescencia conduce a una fibrosis excesiva debido a la continua proliferación de células estelares.
- Las células estelares senescentes regulan a la baja la producción de matriz extracelular y regulan al alza las enzimas que degradan la matriz.
- Las células asesinas naturales eliminan eficientemente las células estelares senescentes, promoviendo la resolución de la fibrosis.
Conclusiones:
- El programa de senescencia en las células estelares hepáticas limita la respuesta fibrogénica a la lesión hepática.
- La senescencia actúa como un mecanismo de protección contra la progresión excesiva de la fibrosis.
- Dirigirse a las células senescentes puede ofrecer estrategias terapéuticas para la fibrosis hepática.
Videos de Conceptos Relacionados
Introduction to Fibroblasts
Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
Tissue Renewal without Stem Cells
After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
However, failure of such a system...
However, failure of such a system...
Liver Regeneration
The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
Cells of Liver
The liver comprises four major types of cells— hepatocytes, stellate, Kupffer, and sinusoidal endothelial cells. The hepatocytes are large...
Cells of Liver
The liver comprises four major types of cells— hepatocytes, stellate, Kupffer, and sinusoidal endothelial cells. The hepatocytes are large...
Cirrhosis I: Introduction
Cirrhosis is a chronic, irreversible liver disease characterized by the widespread replacement of healthy liver tissue with fibrotic scar tissue and the formation of regenerative nodules.Etiology of cirrhosisCirrhosis results from sustained liver injury that triggers progressive fibrosis and structural remodeling. The underlying causes are diverse, encompassing common and less frequent clinical conditions. Regardless of the origin, all causes lead to chronic inflammation, hepatocyte loss, and...
Cirrhosis II: Pathophysiology
Cirrhosis is a progressive chronic liver injury caused by prolonged inflammation, excessive fibrotic remodeling, and impaired regeneration. Over time, repeated hepatic insults disrupt the liver’s architecture and function, leading to reduced blood flow, impaired bile drainage, and diminished metabolic capacity.Pathophysiology of cirrhosisCirrhosis arises from three main responses to chronic liver damage: inflammation, immune activation, and hepatocyte death. These processes lead to structural...

