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Overview of Cell Signaling

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...

Overview of Cell Signaling

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 Responses

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...

Intracellular Signaling Cascades

Intracellular Signaling Cascades

Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...

Intracellular Signaling Cascades

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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...

What is Cell Signaling?

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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.

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Related Experiment Video

Updated: May 30, 2026

Mimicking the Function of Signaling Proteins: Toward Artificial Signal Transduction Therapy

Mimicking the Function of Signaling Proteins: Toward Artificial Signal Transduction Therapy

Published on: September 29, 2016

Information theory based approaches to cellular signaling.

Christian Waltermann¹, Edda Klipp

¹Humboldt-Universitat zu Berlin, Berlin, Germany. christian.waltermann@hu-berlin.de

Biochimica Et Biophysica Acta

|July 30, 2011

Summary

Cells use signaling pathways to process environmental information and respond optimally. Information theory quantifies this cellular information processing, aiding in understanding biological systems.

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Area of Science:

Systems Biology
Cellular Biology
Information Theory

Background:

Cells must distinguish significant environmental changes from noise.
Cellular signaling pathways are crucial for perceiving and transmitting information.
Adequate cellular responses require processing multiple external parameters.

Purpose of the Study:

To review methods for quantifying information processing in individual cells.
To explore the application of information theory in systems biology.

Main Methods:

Review of information theory concepts like Shannon entropy and mutual information.
Analysis of signaling pathway cross-talk and specificity measures.

Main Results:

Information theory aids in identifying optimal pathway structures.
Mutual information and entropy are valuable for system response sensitivity analysis.
Information theory enables quantification of input and output information in biological systems.

Conclusions:

Information theory applications in biology are expanding, particularly in systems biology.
This approach offers a holistic understanding of biochemical systems and cellular signaling.
The study contributes to the Systems Biology of Microorganisms special issue.