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Updated: May 6, 2026
A Multiplexed Luciferase-based Screening Platform for Interrogating Cancer-associated Signal Transduction in Cultured Cells
Published on: July 3, 2013
Split Gaussia luciferase for imaging ligand-receptor binding
Kathryn E Luker1, Gary D Luker
1Center for Molecular Imaging, Department of Radiology, University of Michigan, Ann Arbor, MI, USA.
Abstract:
Ligand binding to cell surface receptors activates signaling pathways in normal and pathologic conditions, and internalized ligand-receptor complexes may continue to signal from endosomes. Accessibility of cell surface receptors and the central function of ligand-receptor binding in signal transduction make ligand binding a prime target for therapeutic agents. We describe a Gaussia luciferase complementation method for imaging ligand-receptor binding in cell-based assays and living mice. While we illustrate this imaging method for chemokine ligand CXCL12 and its receptors CXCR4 and CXCR7, this imaging strategy can be generalized to a large number of ligand-receptor interactions.
Insights
We developed a novel imaging method to visualize ligand-receptor binding in real-time using Gaussia luciferase complementation. This technique allows for tracking molecular interactions in cells and living animals, aiding therapeutic development.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Cell surface receptor signaling is crucial in normal and disease states.
- Ligand-receptor interactions initiate intracellular pathways, making them key therapeutic targets.
- Internalized complexes can sustain signaling, highlighting the need for dynamic monitoring.
Purpose of the Study:
- To introduce a novel imaging method for visualizing ligand-receptor binding.
- To demonstrate the utility of Gaussia luciferase complementation for this purpose.
- To validate the method in cell-based assays and in vivo.
Main Methods:
- Utilized Gaussia luciferase complementation assay for proximity-based detection of ligand-receptor interactions.
- Applied the method to image the binding of chemokine ligand CXCL12 to its receptors CXCR4 and CXCR7.
- Validated the imaging strategy in both cell cultures and live mouse models.
Main Results:
- Successfully imaged ligand-receptor binding dynamics using the developed complementation assay.
- Demonstrated the feasibility of tracking specific chemokine interactions in a physiological context.
- Showcased the adaptability of the imaging strategy for diverse ligand-receptor pairs.
Conclusions:
- Gaussia luciferase complementation provides a powerful tool for imaging ligand-receptor binding.
- This method enables real-time monitoring of molecular interactions in complex biological systems.
- The strategy holds broad applicability for studying various ligand-receptor systems and advancing therapeutic discovery.
