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Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
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Related Experiment Video

Updated: Apr 28, 2026

A Flow Cytometry-based Assay to Identify Compounds That Disrupt Binding of Fluorescently-labeled CXC Chemokine Ligand 12 to CXC Chemokine Receptor 4
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Constitutively active chemokine CXC receptors.

Xinbing Han1

  • 1Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.

Advances in Pharmacology (San Diego, Calif.)
|June 17, 2014
PubMed
Summary

Chemokine receptors, G protein-coupled receptors (GPCRs), can be constitutively active, driving immune diseases and cancers. Understanding this activation is key for developing new treatments for autoimmune diseases and tumors.

Keywords:
Biased signalingCXC chemokineChemokine CXC receptorsConstitutively active mutantsDimerizationG protein signalingInflammationInverse antagonistSmall-molecule designTumor

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Rapid and Robust Analysis of Cellular and Molecular Polarization Induced by Chemokine Signaling
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Related Experiment Videos

Last Updated: Apr 28, 2026

A Flow Cytometry-based Assay to Identify Compounds That Disrupt Binding of Fluorescently-labeled CXC Chemokine Ligand 12 to CXC Chemokine Receptor 4
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A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
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Rapid and Robust Analysis of Cellular and Molecular Polarization Induced by Chemokine Signaling
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Rapid and Robust Analysis of Cellular and Molecular Polarization Induced by Chemokine Signaling

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Area of Science:

  • Immunology
  • Molecular Biology
  • Pharmacology

Background:

  • Chemokines are secreted proteins that attract leukocytes, crucial for cell signaling.
  • Chemokine receptors are G protein-coupled receptors (GPCRs) that regulate cell migration, differentiation, and proliferation.
  • Constitutive GPCR activity is implicated in immune-mediated diseases and tumors.

Purpose of the Study:

  • To review the regulation of CXC chemokine receptor signaling.
  • To focus on the constitutive activation of these receptors.
  • To explore implications in physiological conditions and pathogenesis.

Main Methods:

  • Review of scientific literature on CXC chemokine receptors and their signaling pathways.
  • Analysis of known constitutively active CXC chemokine receptor mutants (e.g., CXCR1, CXCR2, CXCR3, CXCR4).
  • Discussion of GPCR activation mechanisms and their relevance to disease.

Main Results:

  • Over 40 chemokine members exist, classified into subfamilies (CXC, C, CC, CX3C).
  • Seven CXC receptors (CXCR1-7) have been identified.
  • Several constitutively active mutants of CXCR1, CXCR2, CXCR3, and CXCR4 have been characterized.

Conclusions:

  • Constitutive activation of CXC chemokine receptors plays a role in disease pathogenesis.
  • Understanding these mechanisms can inform the design of drugs targeting autoimmune diseases and cancers.
  • Further research into inverse agonists and allosteric modulators is warranted.