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Related Concept Videos

Intracellular Signaling Cascades01:24

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 Cascades01:24

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...
Amplifying Signals via Second Messengers01:15

Amplifying Signals via Second Messengers

Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
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cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Global Regulatory Systems01:28

Global Regulatory Systems

Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...

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Updated: May 16, 2026

Drug-induced Sensitization of Adenylyl Cyclase: Assay Streamlining and Miniaturization for Small Molecule and siRNA Screening Applications
09:39

Drug-induced Sensitization of Adenylyl Cyclase: Assay Streamlining and Miniaturization for Small Molecule and siRNA Screening Applications

Published on: January 27, 2014

Cyclic AMP.

M L Steer

    Annals of Surgery
    |July 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Cyclic adenosine monophosphate (cAMP) mediates hormone actions, with established roles in glycogen metabolism. This review examines cAMP's involvement in other cellular functions, including muscle contraction and secretion.

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    Area of Science:

    • Biochemistry
    • Cellular Biology
    • Endocrinology

    Background:

    • Cyclic adenosine monophosphate (cAMP) is a crucial second messenger.
    • Hormonal regulation of cellular processes often involves cAMP.
    • Established mechanisms link cAMP to glycogen metabolism in muscle and liver.

    Purpose of the Study:

    • To review the established role of cAMP in glycogen metabolism.
    • To evaluate the evidence for cAMP's involvement in other cellular functions.
    • To provide a comprehensive overview of cAMP-mediated cellular regulation.

    Main Methods:

    • Selective literature review.
    • Analysis of experimental data on cAMP.
    • Synthesis of evidence for and against cAMP's regulatory roles.

    Main Results:

    • The role of cAMP in liver and skeletal muscle glycogen metabolism is well-defined.
    • Evidence supports cAMP's involvement in cardiac contractility and smooth muscle relaxation.
    • The role of cAMP in platelet aggregation and various exocrine secretions is less conclusive.

    Conclusions:

    • cAMP is a key mediator of diverse cellular responses.
    • Further research is needed to fully elucidate cAMP's function in certain physiological processes.
    • Understanding cAMP signaling is vital for comprehending hormone action and cellular regulation.