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Published on: November 23, 2015
A Proximity-Dependent Biosensor System for Visualizing Cell-Cell Interactions Induced by Therapeutic Antibodies
Yu Tang1, XiaoZhi Liao1, Yanguang Cao2
1Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC. 27599, United States.
Abstract:
Despite the promise of therapeutic antibodies in engaging the immune system to eliminate malignant cells, many aspects of the complex interplay between immune cells and cancer cells induced by antibody therapy remain incompletely understood. This study aimed to develop a biosensor system that can evaluate direct cell-cell physical contact and interactions between immune effector and target cells induced by therapeutic antibodies in physiologically relevant environments. The system uses two structural complementary luciferase units (SmBit and LgBit) expressed on the respective membranes of effector and target cells. Upon cell-cell contact, the two subunits form active NanoLuc, generating a luminescent signal, allowing for real-time monitoring of cell-cell interactions and quantitatively assessing the pharmacological effects of therapeutic antibodies. We optimized the system to ensure selectivity by adjusting the spacer lengths between two luciferase units to minimize interference from nonspecific intercellular contact. The system was applied to quantitatively monitor cell-cell interactions between NK and target cells induced by rituximab and between T and target cells induced by blinatumomab in a 3D cell culture system. The biosensor system has the potential to characterize antibody pharmacology through a deeper understanding of antibody-mediated cell-cell interactions.
Insights
Researchers developed a novel biosensor to track immune cell and cancer cell interactions during antibody therapy. This tool quantifies therapeutic antibody effects by measuring direct cell-cell contact in real-time.
Area of Science:
- Immunology
- Biotechnology
- Cancer Research
Background:
- Therapeutic antibodies show promise in cancer treatment by engaging the immune system.
- Understanding immune cell-cancer cell interactions is crucial for optimizing antibody therapy.
- Current methods have limitations in evaluating these complex interactions in real-time.
Purpose of the Study:
- To develop a novel biosensor system for evaluating direct cell-cell physical contact and interactions.
- To enable real-time monitoring and quantitative assessment of therapeutic antibody effects.
- To provide a tool for deeper characterization of antibody pharmacology.
Main Methods:
- Engineered effector and target cells with complementary luciferase subunits (SmBit and LgBit).
- Upon cell-cell contact, subunits form NanoLuc, generating a luminescent signal.
- Optimized spacer lengths for selectivity and applied the system in a 3D cell culture model.
Main Results:
- Successfully developed a biosensor system for monitoring cell-cell interactions.
- Quantitatively assessed interactions between NK and target cells with rituximab.
- Quantitatively assessed interactions between T cells and target cells with blinatumomab.
Conclusions:
- The biosensor system enables real-time, quantitative assessment of antibody-mediated cell-cell interactions.
- This technology offers potential for characterizing antibody pharmacology and optimizing cancer immunotherapy.
- Further application in physiologically relevant environments can advance our understanding of therapeutic antibodies.
