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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...
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...
Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
Some signaling systems generate...

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Related Experiment Video

Updated: Jul 1, 2026

Dissection of Local Ca2+ Signals in Cultured Cells by Membrane-targeted Ca2+ Indicators
11:33

Dissection of Local Ca2+ Signals in Cultured Cells by Membrane-targeted Ca2+ Indicators

Published on: March 22, 2019

Timing in cellular Ca2+ signaling.

Michael J Boulware1, Jonathan S Marchant

  • 1Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA.

Current Biology : CB
|September 13, 2008
PubMed
Summary
This summary is machine-generated.

Calcium (Ca2+) signal timing is crucial for cellular information processing and physiological responses. Understanding these kinetics is vital for decoding cellular communication and has implications for diseases and time perception.

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Measuring Fast Calcium Fluxes in Cardiomyocytes
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Measuring Fast Calcium Fluxes in Cardiomyocytes

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Last Updated: Jul 1, 2026

Dissection of Local Ca2+ Signals in Cultured Cells by Membrane-targeted Ca2+ Indicators
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Applications of Spatio-temporal Mapping and Particle Analysis Techniques to Quantify Intracellular Ca2+ Signaling In Situ
09:34

Applications of Spatio-temporal Mapping and Particle Analysis Techniques to Quantify Intracellular Ca2+ Signaling In Situ

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Measuring Fast Calcium Fluxes in Cardiomyocytes
12:10

Measuring Fast Calcium Fluxes in Cardiomyocytes

Published on: November 29, 2011

Area of Science:

  • Cellular Biology
  • Biophysics
  • Neuroscience

Background:

  • Calcium ions (Ca2+) act as critical intracellular messengers.
  • The temporal dynamics of Ca2+ signals are fundamental to cellular function.
  • Dysregulation of Ca2+ signaling is implicated in various pathologies.

Purpose of the Study:

  • To explore the impact of kinetic considerations on Ca2+ signal processing.
  • To elucidate the role of timing in cellular responses mediated by Ca2+.
  • To investigate the link between Ca2+ signaling kinetics, disease, and time perception.

Main Methods:

  • Analysis of Ca2+ signal kinetics across different time scales.
  • Investigating information processing within Ca2+ signaling pathways.
  • Examining the temporal amplification of Ca2+ signals.
  • Correlating altered Ca2+ signal kinetics with disease states and time perception.

Main Results:

  • Kinetic properties dictate how Ca2+ signals encode and decode information.
  • Temporal aspects of Ca2+ signaling ensure specific, efficient, and amplified cellular responses.
  • Altered Ca2+ signal kinetics are observed in certain diseases.
  • Basal Ca2+ fluctuations may influence the perception of time.

Conclusions:

  • The timing of Ca2+ signals is essential for effective cellular communication and physiological outcomes.
  • Understanding Ca2+ signal kinetics offers insights into disease mechanisms and the neurobiology of time.
  • Ca2+ signaling and biological timing exhibit a reciprocal relationship.