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Live Cell Imaging and Optogenetics-Based Assays for GPCR Activity.

Xenia Meshik1, Narasimhan Gautam2,3

  • 1Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO, USA.

Methods in Molecular Biology (Clifton, N.J.)
|June 4, 2021
PubMed
Summary
This summary is machine-generated.

Optically activatable G protein-coupled receptors (GPCRs) enable precise control of cellular signaling. New optogenetic methods and live-cell imaging assays track GPCR pathway activation in real-time for drug development.

Keywords:
Cell migrationG proteinsGPCRsGβγ translocationLive cell imagingOpsinsOptogeneticsSecond messengers

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Neuroscience

Background:

  • G protein-coupled receptors (GPCRs) mediate diverse cellular functions.
  • Real-time monitoring of GPCR activity is crucial for understanding signaling dynamics.
  • Optically activatable GPCRs (opsins) offer precise spatiotemporal control over signaling pathways.

Purpose of the Study:

  • To describe optogenetic methods for activating Gi, Gq, and Gs signaling pathways.
  • To present novel assays for real-time detection of GPCR pathway activation.
  • To enable GPCR-targeted drug development and study of physiological processes.

Main Methods:

  • Development of optogenetic tools for GPCR activation.
  • Live-cell imaging techniques to monitor downstream effectors.
  • Assays measuring Gβγ translocation, PIP3 increase, PIP2 hydrolysis, cAMP production, and cell migration.

Main Results:

  • Successful optogenetic activation of Gi, Gq, and Gs signaling pathways.
  • Real-time visualization of signaling events including Gβγ translocation and cAMP production.
  • Demonstration of assays applicable to GPCR drug discovery and research.

Conclusions:

  • Optogenetic approaches provide powerful tools for dissecting GPCR signaling.
  • Live-cell imaging assays offer dynamic insights into GPCR pathway activation.
  • These methods advance GPCR research and therapeutic development.