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Videos de Conceptos Relacionados

Contact-dependent Signaling01:19

Contact-dependent Signaling

Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
What is Cell Signaling?02:03

What is Cell Signaling?

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
What is Cell Signaling?02:03

What is Cell Signaling?

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
Overview of Cell Signaling01:23

Overview of Cell Signaling

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
Cells respond to many types of information, often through receptor proteins positioned on the membrane. For example, skin cells respond to and transmit touch...
Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
Some signaling systems generate...
Cell Signaling Feedback Loops01:07

Cell Signaling Feedback Loops

Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...

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Video Experimental Relacionado

Updated: Jul 14, 2026

A Standardized Approach for Multispecies Purification of Mammalian Male Germ Cells by Mechanical Tissue Dissociation and Flow Cytometry
08:46

A Standardized Approach for Multispecies Purification of Mammalian Male Germ Cells by Mechanical Tissue Dissociation and Flow Cytometry

Published on: July 12, 2017

Envío de mensajes mixtos para el control de la población celular.

Hyun Youk1, Wendell A Lim2

  • 1Center for Systems and Synthetic Biology, University of California, San Francisco, San Francisco, CA 94158, USA; Department of Cellular and Molecular Pharmacology, University of California, San Francisco, San Francisco, CA 94158, USA.

Cell
|August 30, 2014
PubMed
Resumen

Una sola molécula controla la densidad de población de células T al desencadenar la proliferación o la muerte. Esta respuesta biestable asegura que las células alcancen una densidad estable o se extingan, aclarando los mecanismos de control de la población.

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Last Updated: Jul 14, 2026

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Área de la Ciencia:

  • Inmunología Inmunología.
  • Biología celular Biología celular.
  • Biología de Sistemas Biología de Sistemas.

Sus antecedentes:

  • La proliferación celular es esencial para la homeostasis de los tejidos y las respuestas inmunes.
  • Los mecanismos que regulan la densidad de la población celular no se comprenden completamente.
  • Las células T juegan un papel crítico en la inmunidad adaptativa y requieren un control preciso de la población.

Objetivo del estudio:

  • Para investigar cómo se regula la densidad de la población de células T.
  • Para identificar las vías de señalización involucradas en el control del número de células.
  • Comprender el papel de las moléculas secretadas en la dinámica de la población celular.

Principales métodos:

  • Utilizó el modelado matemático para simular la dinámica de la población celular.
  • Empleó análisis computacional de las vías de señalización de las células T.
  • Datos experimentales integrados sobre la proliferación y muerte de las células T.

Principales resultados:

  • Identificaron una sola molécula secretada que regula simultáneamente la proliferación y muerte de las células T.
  • Se demostró que esta molécula induce una respuesta celular biestable.
  • Se demostró que las poblaciones de células T se dirigen hacia la extinción o hacia una densidad homeostáticamente definida.

Conclusiones:

  • Un solo factor secretado puede establecer un control robusto sobre la densidad de la población celular.
  • Las respuestas bistales son un mecanismo clave para mantener la homeostasis celular.
  • Este hallazgo proporciona información sobre la regulación de las poblaciones de células inmunes.