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Related Concept Videos

GPCR Desensitization01:12

GPCR Desensitization

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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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G Protein-coupled Receptors01:15

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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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Updated: Sep 1, 2025

HSV-Mediated Transgene Expression of Chimeric Constructs to Study Behavioral Function of GPCR Heteromers in Mice
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Chimeric GPCRs mimic distinct signaling pathways and modulate microglia responses.

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  • 1Institute of Science and Technology Austria (ISTA), Am Campus 1, 3400, Klosterneuburg, Austria.

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Researchers engineered novel DREADD-based GPCR chimeras to study cell-specific signaling. This approach overcomes limitations of unknown ligands and off-target effects, enabling precise investigation of G protein-coupled receptor pathways.

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Area of Science:

  • Neuroscience
  • Immunology
  • Pharmacology

Background:

  • G protein-coupled receptors (GPCRs) are crucial for cellular processes but often lack specific ligands or exhibit off-target effects.
  • Investigating cell type-specific GPCR functions is challenging due to broad expression patterns.

Purpose of the Study:

  • To develop a novel DREADD-based chimera system for studying GPCRs with unknown ligands or complex expression patterns.
  • To validate the functionality of DREADD-GPCR chimeras in recapitulating endogenous receptor signaling and cellular responses.

Main Methods:

  • Engineered DREADD-based GPCR chimeras that bind clozapine-N-oxide.
  • Assessed chimera functionality by measuring second messenger and kinase activity, post-translational modifications, and protein-protein interactions.
  • Utilized chimeras to investigate β2AR, GPR65, and GPR109A signaling in microglia.

Main Results:

  • DREADD-β2AR chimeras mimicked endogenous β2AR signaling pathways, including filopodia formation in microglia.
  • DREADD-β2AR and DREADD-GPR65 chimeras modulated microglial inflammatory responses similarly to their endogenous counterparts.
  • DREADD-GPR109A chimeras showed no significant impact on microglial inflammation.

Conclusions:

  • DREADD-based GPCR chimeras provide a versatile tool to study cell type-specific GPCR functions.
  • This approach enables the investigation of pathways involving GPCRs lacking known endogenous ligands or exhibiting complex expression profiles.
  • The system facilitates dissection of cellular responses, particularly in neuroinflammation research.