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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.

Cell-surface Signaling

Cell-surface Signaling

Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.

PI3K/mTOR/AKT Signaling Pathway

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...

Cell Signaling Feedback Loops

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...

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...

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Related Experiment Video

Updated: Jun 27, 2026

Optogenetic Signaling Activation in Zebrafish Embryos

Optogenetic Signaling Activation in Zebrafish Embryos

Published on: October 27, 2023

Recent patents on cell signaling systems.

Minna Allarakhia¹, Anthony Wensley

¹University of Waterloo, Department of Management Sciences, 200 University Avenue, Waterloo, ON, N2L 3G1, Canada. minna@alum.mit.edu

Recent Patents on Biotechnology

|December 17, 2008

Summary

Systems Biology leverages complex biological networks for new product development. This study analyzes patents for seven key signaling pathways to ensure knowledge accessibility for researchers.

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

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Published on: September 29, 2016

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Last Updated: Jun 27, 2026

Optogenetic Signaling Activation in Zebrafish Embryos

Optogenetic Signaling Activation in Zebrafish Embryos

Published on: October 27, 2023

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

Area of Science:

Systems Biology
Genomics
Bioinformatics

Background:

The Human Genome Project catalyzed the emergence of Systems Biology.
Biological information is processed through complex, hierarchical networks.
Accessible systems-based knowledge is crucial for developing medical products.

Purpose of the Study:

To analyze patent landscapes for significant biological systems.
To assess the accessibility of systems-based knowledge for researchers.
To identify trends in patenting upstream knowledge versus downstream applications.

Main Methods:

Selection of seven biologically significant signaling pathways: Akt, BCR-ABL, GPCR, JAK/STAT, MAP Kinase, NF-kappaB, and Phospholipase C.
Comprehensive patent listing, including categorization and ownership.
Patent review focusing on assignee type, claim breadth, and focus (upstream vs. downstream).

Main Results:

Detailed patent information provided for each selected signaling pathway.
Analysis of patent focus reveals trends in research and development.
Categorization and ownership data offer insights into intellectual property.

Conclusions:

Systems Biology represents a dominant paradigm shift in biological research.
Patent analysis is essential for understanding knowledge accessibility and innovation.
This work provides a foundation for navigating the intellectual property landscape in Systems Biology.