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Related Concept Videos

Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
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,...
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...
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...

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Fluorescent Calcium Imaging and Subsequent In Situ Hybridization for Neuronal Precursor Characterization in Xenopus laevis
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Interactions between calcium and cAMP signaling.

A M Hofer1

  • 1VA Boston Healthcare System and the Department of Surgery, Brigham and Women's Hospital and Harvard Medical School, 1400 VFW Parkway, West Roxbury MA 02132, USA. ahofer@rics.bwh.harvard.edu

Current Medicinal Chemistry
|September 12, 2012
PubMed
Summary
This summary is machine-generated.

Calcium ions (Ca2+) and cyclic AMP (cAMP) are crucial signaling molecules that intricately regulate cellular functions. This review updates on their reciprocal regulation, particularly within localized cellular domains.

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Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • Calcium ions (Ca2+) are ubiquitous intracellular messengers regulating diverse cellular processes.
  • Ca2+ signaling involves movement by transporters, pumps, and channels, detected by Ca2+-binding proteins.
  • Ca2+ signaling is modulated by other pathways, including cyclic AMP (cAMP).

Purpose of the Study:

  • To review recent findings on the reciprocal regulation between Ca2+ and cAMP signaling pathways.
  • To highlight interactions occurring in specific cellular microdomains.

Main Methods:

  • Literature review of recent research on Ca2+ and cAMP signaling.
  • Focus on studies investigating cross-talk between these two second messenger systems.
  • Emphasis on spatial aspects of signaling interactions.

Main Results:

  • Ca2+ and cAMP signaling pathways exhibit complex, intertwined regulatory mechanisms.
  • Reciprocal modulation occurs at multiple levels within cellular signaling networks.
  • Localized cellular domains are critical sites for these signaling interactions.

Conclusions:

  • The interplay between Ca2+ and cAMP is fundamental to eukaryotic and prokaryotic cell function.
  • Understanding these interactions in specific cellular domains is key to deciphering cellular communication.
  • Further research into localized signaling crosstalk promises new insights into cellular regulation.