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Enzyme-linked Receptors01:00

Enzyme-linked Receptors

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Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
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Spare Receptors01:30

Spare Receptors

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Some receptors remain unoccupied even when an agonist produces a maximal response. Such empty ones are called spare receptors. In presence of spare receptors the maximum effect of an agonist drug is achieved with fewer than 100% of the receptors being occupied. To determine the presence of spare receptors, scientists often compare the concentration of the drug needed to produce 50% of the maximum effect (EC50) with the concentration of the drug needed to occupy 50% of the receptors (Kd). If the...
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Related Experiment Video

Updated: Feb 24, 2026

A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
07:41

A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators

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Multiplex quantitative assays indicate a need for reevaluating reported small-molecule TrkB agonists.

Umed Boltaev1,2, Yves Meyer1, Farangis Tolibzoda1,2

  • 1Department of Chemistry, Columbia University, New York, NY 10027, USA.

Science Signaling
|August 24, 2017
PubMed
Summary

Small-molecule Tropomyosin-related kinase B (TrkB) agonists show promise for brain disorders but lack reliable activation. This study found these compounds did not reproduce expected TrkB receptor activation, highlighting challenges in developing effective TrkB activators.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pharmacology

Background:

  • Brain-derived neurotrophic factor (BDNF) and its receptor Tropomyosin-related kinase B (TrkB) are crucial for brain plasticity and are targets for neurological and psychiatric disorders.
  • Poor pharmacokinetics of BDNF have driven interest in small-molecule TrkB agonists for therapeutic development.
  • Existing small-molecule TrkB agonists are increasingly used as research tools, creating a perception of reliability.

Purpose of the Study:

  • To rigorously evaluate the pharmacological activity of small-molecule TrkB agonists.
  • To develop and optimize quantitative assays for measuring TrkB receptor activation, downstream signaling, and gene expression.
  • To assess the reliability of current small-molecule TrkB agonists as research probes.

Main Methods:

  • Development and optimization of quantitative assays to measure TrkB receptor activation.
  • Assessment of TrkB-dependent downstream signaling pathways.
  • Measurement of TrkB-mediated gene expression changes in cellular models.
  • Comparative analysis of responses elicited by BDNF versus small-molecule TrkB agonists.

Main Results:

  • Native neurotrophic factors (like BDNF) induced robust, dose-dependent TrkB activation and signaling.
  • Small-molecule TrkB agonists failed to reproduce the expected receptor activation and downstream signaling effects.
  • Significant discrepancies were observed between reported activities and experimental findings for these compounds.

Conclusions:

  • Experimental results using current small-molecule TrkB agonists require careful interpretation due to unreliability.
  • Developing dependable pharmacological activators for the TrkB receptor remains a significant challenge.
  • This study underscores the need for validated tools to accurately investigate TrkB signaling pathways.