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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...

What is Cell Signaling?

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?

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.

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...

Bacterial Signaling

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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...

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Related Experiment Video

Updated: Jun 17, 2026

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

Published on: December 27, 2016

Cellular signaling and NO production.

Thomas Michel¹, Paul M Vanhoutte

¹Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA. thomas_michel@harvard.edu

Pflugers Archiv : European Journal of Physiology

|January 19, 2010

Summary

Endothelial nitric oxide synthase (eNOS) regulates blood vessel dilation. Its dysfunction in cardiovascular diseases, like diabetes and hypertension, impairs nitric oxide (NO) release, contributing to vascular problems.

Area of Science:

Vascular Biology
Endothelial Function
Cardiovascular Physiology

Background:

The endothelium releases vasodilator substances, notably nitric oxide (NO), synthesized by endothelial nitric oxide synthase (eNOS).
Endothelium-dependent relaxations involve G(i) and G(q) proteins, with eNOS regulation being complex and influenced by intracellular modifications.
eNOS activity is modulated by various factors and is reduced in cardiovascular diseases, impacting vascular health.

Purpose of the Study:

To explore the intricate regulation of endothelial nitric oxide synthase (eNOS) activity.
To understand how eNOS dysfunction contributes to vascular pathologies.
To identify potential therapeutic targets for cardiovascular diseases by unraveling eNOS regulatory pathways.

Main Methods:

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Review of intracellular regulation of eNOS, including post-translational modifications.

Analysis of eNOS targeting to plasmalemmal caveolae and interactions with regulatory proteins.

Examination of factors up- and down-regulating NO release and its reduction in vascular disease states.

Main Results:

Endothelium-dependent relaxations involve both pertussis-toxin-sensitive G(i) and insensitive G(q) pathways.
eNOS activity is influenced by acylation, phosphorylation, and interactions with regulatory proteins within caveolae.
NO release is reduced in conditions like diabetes and hypertension, and regenerated endothelium after angioplasty shows impaired NO release pathways.

Conclusions:

Dysregulation of eNOS pathways contributes to vascular disease pathogenesis.
Impaired NO release from regenerated endothelium promotes vasospasm, thrombosis, and inflammation.
Further understanding of eNOS regulation may reveal novel therapeutic strategies for cardiovascular conditions.