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Related Concept Videos

Feedback Regulation of Calcium Concentration01:27

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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.
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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.
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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.
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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
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Related Experiment Video

Updated: Apr 24, 2026

Fluorescent Calcium Imaging and Subsequent In Situ Hybridization for Neuronal Precursor Characterization in Xenopus laevis
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Decoding calcium signaling across the nucleus.

André G Oliveira1, Erika S Guimarães2, Lídia M Andrade1

  • 1Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil;

Physiology (Bethesda, Md.)
|September 3, 2014
PubMed
Summary
This summary is machine-generated.

Calcium ions (Ca2+) act as crucial signals within the cell nucleus, controlling distinct cellular events. This review explores nuclear calcium signaling's role in health and disease.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Calcium ions (Ca2+) are vital second messengers regulating numerous cellular processes.
  • A specific Ca2+-signaling toolkit operates within the nucleus.
  • Nuclear Ca2+ transients modulate distinct cellular functions compared to cytosolic Ca2+.

Purpose of the Study:

  • To review the significance of nuclear Ca2+ signals.
  • To elucidate the role of nuclear Ca2+ in physiological and pathological conditions.

Main Methods:

  • Literature review of studies on nuclear calcium signaling.
  • Analysis of research on Ca2+-handling proteins in the nucleus.
  • Synthesis of data on the functional outcomes of nucleoplasmic Ca2+ transients.

Main Results:

  • The nucleus possesses a dedicated Ca2+-signaling system.
  • Nuclear Ca2+ transients regulate unique cellular events.
  • Dysregulation of nuclear Ca2+ is implicated in various diseases.

Conclusions:

  • Nuclear Ca2+ signaling is a critical regulator of cellular functions.
  • Understanding nuclear Ca2+ pathways offers therapeutic potential for diseases.