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Bacterial Signaling

Bacterial Signaling

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...

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

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...

Interactions Between Signaling Pathways

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...

Intracellular Signaling Affects Focal Adhesions

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...

Signal Transduction: Overview

Signal Transduction: Overview

Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
Typically, signal transduction involves three...

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Related Experiment Video

Updated: Jul 14, 2026

A Model for Perineural Invasion in Head and Neck Squamous Cell Carcinoma

A Model for Perineural Invasion in Head and Neck Squamous Cell Carcinoma

Published on: January 5, 2017

New signals from the invasive front.

Gerhard Christofori¹

¹Department of Clinical-Biological Sciences, Center of Biomedicine, University of Basel, Mattenstrasse 28, CH-4058 Basel, Switzerland. gerhard.christofori@unibas.ch

|May 26, 2006

Summary

Metastasis, the spread of cancer, causes most cancer deaths. Understanding the molecular mechanisms of cancer invasion and metastasis is crucial for developing new treatments.

Area of Science:

Oncology
Molecular Biology
Cancer Research

Background:

Metastasis is responsible for approximately 90% of all cancer-related deaths.
The molecular mechanisms underlying local invasion and metastasis formation remain poorly understood.
Understanding these processes is a key challenge in cancer research.

Purpose of the Study:

To elucidate the molecular pathways and cellular mechanisms driving metastasis.
To identify key stages in the multistage process of metastasis formation.

Main Methods:

Review of recent experimental progress in metastasis research.
Analysis of identified molecular pathways and cellular mechanisms.

Main Results:

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Published on: May 1, 2018

Long-term In Vivo Tracking of Inflammatory Cell Dynamics Within Drosophila Pupae

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Published on: June 14, 2018

Related Experiment Videos

Last Updated: Jul 14, 2026

A Model for Perineural Invasion in Head and Neck Squamous Cell Carcinoma

A Model for Perineural Invasion in Head and Neck Squamous Cell Carcinoma

Published on: January 5, 2017

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

Long-term In Vivo Tracking of Inflammatory Cell Dynamics Within Drosophila Pupae

Long-term In Vivo Tracking of Inflammatory Cell Dynamics Within Drosophila Pupae

Published on: June 14, 2018

Identified key stages of metastasis: tumour invasion, dissemination, colonization, and outgrowth.

Highlighted the clinical relevance of understanding these molecular processes.

Conclusions:

Significant progress has been made in identifying molecular drivers of metastasis.
Further research into these mechanisms is essential for improving cancer patient outcomes.