Signal Transduction Pathway
Signal Transduction Pathway - Related Videos
02:40
Detecting SMAD Pathway Activation Using Dual Adenovirus Transduction
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2026
Source: Chen, H., et al. Live Cell Imaging of the TGF-β/Smad3 Signaling Pathway In Vitro and In Vivo Using an Adenovirus Reporter System. J. Vis. Exp. (2018).This video demonstrates a method to study SMAD pathway activation in breast cancer cells using dual adenoviral infection. One virus delivers a constitutively expressed GFP gene, while the other carries an RFP reporter under a SMAD-sensitive promoter. Upon TGF-beta stimulation, SMAD proteins are activated, forming a complex that induces RFP...
12:24
Mimicking the Function of Signaling Proteins: Toward Artificial Signal Transduction Therapy
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2016
We present guidelines for developing synthetic 'chemical transducers' that can induce communication between naturally unrelated proteins. In addition, detailed protocols are presented for synthesizing and testing a specific 'transducer' that enables a growth factor to activate a detoxifying enzyme and consequently, to regulate the cleavage of an anticancer prodrug.
01:26
Signal Transduction: Overview
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2025
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...
11:48
Grafting of Beads into Developing Chicken Embryo Limbs to Identify Signal Transduction Pathways Affecting Gene Expression
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Cited by 2 •
2016
By grafting beads soaked in growth factors or specific inhibitors of signaling pathways into developing embryos it is possible to directly test their effects in vivo. In this protocol beads are grafted into the limb bud to determine the effects of these molecules on gene expression and signal transduction.
07:42
Assessment of Resistance to Tyrosine Kinase Inhibitors by an Interrogation of Signal Transduction Pathways by Antibody Arrays
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Cited by 1 •
2018
Here, we present a protocol for antibody arrays to identify alterations in signaling pathways in various cellular models. These changes, caused by drugs/hypoxia/ultra-violet light/radiation, or by overexpression/downregulation/knockouts, are important for various disease models and can indicate whether a therapy will be effective or can identify mechanisms of drugs resistance.
FAQs
Receptor location determines where a signal is first detected. Cell-surface receptors respond to signals outside the cell, whereas intracellular receptors detect internal signals. Binding changes the receptor’s conformation, or three-dimensional shape, and this structural shift initiates downstream molecular events. The distinction helps explain how cells selectively respond to signals originating in different cellular compartments.
Phosphorylation cascades and second-messenger production are two major ways a signal progresses through a cell. Phosphorylation changes the activity of proteins in sequence, while second messengers convey information from an activated receptor to other cellular targets. Either mechanism can transmit the initial signal toward responses involving gene expression, metabolism, movement, proliferation, or programmed cell death.
Signal amplification allows a relatively small initiating event to produce a larger cellular effect. Once a receptor is activated, successive molecular events can extend the signal through phosphorylation or second-messenger production. This amplification helps a cell generate a clear response, while the specific downstream components determine whether the outcome involves altered gene expression, metabolism, movement, proliferation, or programmed cell death.
Different cellular outcomes arise because signaling events can regulate distinct molecular targets and processes. Depending on the pathway components engaged, the response may alter gene expression, metabolism, movement, proliferation, or programmed cell death. This range allows signal transduction to connect molecular communication with specialized biological behaviors rather than producing one universal response to every signal.
Researchers study these pathways by examining the sequence of molecular events connecting a signal with a cellular response and by identifying the components involved. Attention to receptors, conformational changes, phosphorylation cascades, and second messengers helps clarify how information moves through the cell. This approach supports explanations of cellular adaptation, development, immune responses, and disease mechanisms.
Identifying pathway components can reveal molecules associated with disease mechanisms and provide candidates for biomarker discovery. Biomarkers can help characterize biological or disease-related states, while knowledge of pathway components can support the design of targeted therapies. These applications connect basic study of cellular communication with efforts to understand disease and develop more focused therapeutic strategies.