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Related Concept Videos

Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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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.
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Microtubules in Signaling

The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
Contact-dependent Signaling01:19

Contact-dependent Signaling

Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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Overview of Cell Signaling01:23

Overview of Cell Signaling

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
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Substructure Analyzer: A User-Friendly Workflow for Rapid Exploration and Accurate Analysis of Cellular Bodies in Fluorescence Microscopy Images
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Signals controlling Cajal body assembly and function.

Michael D Hebert1

  • 1Department of Biochemistry, The University of Mississippi Medical Center, Jackson, MS 39216 4505, USA. mhebert@umc.ed

The International Journal of Biochemistry & Cell Biology
|April 16, 2013
PubMed
Summary
This summary is machine-generated.

Cajal bodies (CBs) are crucial for making snRNPs and telomerase. Targeting signals that control CBs may offer new cancer treatments by disrupting these essential cellular processes.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Cajal bodies (CBs) are vital subnuclear structures involved in the biogenesis of small nuclear ribonucleoproteins (snRNPs) and telomerase.
  • Their presence is notable in cells with high metabolic demands, such as neurons and cancer cells.

Purpose of the Study:

  • To review the signals influencing the formation and activity of Cajal bodies.
  • To emphasize the role of phosphorylation and mechanotransduction in regulating CBs.
  • To explore the function of coilin as a sensor of environmental signals within CBs.

Main Methods:

  • Literature review focusing on signaling pathways affecting Cajal bodies.
  • Analysis of recent findings on coilin's role in sensing environmental cues.
  • Discussion of phosphorylation and mechanotransduction as regulatory mechanisms.

Main Results:

  • Phosphorylation is identified as a key regulator of Cajal body formation and composition.
  • Mechanotransduction presents a non-biochemical pathway impacting Cajal bodies.
  • Coilin, the marker protein, acts as a global sensor responding to environmental signals.

Conclusions:

  • Cajal bodies, through coilin, sense environmental signals.
  • Disrupting these signals can decrease snRNP and telomerase generation.
  • Targeting Cajal body signaling pathways may be a promising strategy for cancer therapy.