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Related Experiment Videos

GPCR functional selectivity has therapeutic impact.

Richard B Mailman1

  • 1Neurosciences Hospital, University of North Carolina School of Medicine, Chapel Hill, NC 27599-7160, USA. richard_mailman@med.unc.edu

Trends in Pharmacological Sciences
|July 17, 2007
PubMed
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Functional selectivity, where ligands differentially activate pathways from a single receptor, shows promise in predicting in vivo behaviors. This research suggests functionally selective compounds offer new drug discovery avenues.

Area of Science:

  • Pharmacology
  • Neuroscience
  • Drug Discovery

Background:

  • Ligands can exhibit functional selectivity, differentially activating signaling pathways via a single receptor in vitro.
  • The in vivo relevance of in vitro functional selectivity remains largely unelucidated.

Purpose of the Study:

  • To investigate the in vivo significance of functional selectivity.
  • To explore whether in vitro functional selectivity predicts in vivo behavioral actions.
  • To re-evaluate the mechanism of action for antipsychotic drugs like aripiprazole.

Main Methods:

  • Utilized in vitro data on functional selectivity at the dopamine D2L receptor.
  • Examined experimental compounds exhibiting functional selectivity.
  • Analyzed data from animal models and human studies concerning aripiprazole's effects.

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Main Results:

  • Experimental compounds with in vitro functional selectivity at the dopamine D2L receptor suggested potential for atypical behavioral actions in vivo.
  • Aripiprazole, commonly considered a D2 partial agonist, demonstrates functional selectivity in vitro.
  • The in vivo effects of aripiprazole are better explained by its functional selectivity than its partial agonism.

Conclusions:

  • Compounds exhibiting functional selectivity in vitro are likely to possess novel in vivo actions.
  • Functional selectivity represents a promising avenue for developing new therapeutics.
  • This research supports a paradigm shift in understanding receptor-ligand interactions and drug action.