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MINFLUX nanoscopy to study the NK cell immune synapse
Nora Ross1, Daniel P Leaman2, Jessica Matthias3
1San Diego Biomedical Research Institute, San Diego, CA, USA.
Abstract:
Antibody dependent cellular cytotoxicity (ADCC) is an effector function performed by natural killer (NK) cells to target and clear viral infections and cancer. ADCC is a critical feature of several antibody and cellular therapeutics as well as vaccination strategies. Using microscopy to understand the details of molecular events driving ADCC is essential to improving such therapeutics but has been limited by technologies that cannot practically provide the spatial resolution necessary to study protein function at the single molecule level in cells. In this chapter, we describe a model system using MINFLUX nanoscopy to study the molecular distribution of human FcγRIIIa (CD16a), the IgG receptor, in the NK cell immunological synapse during ADCC. The technique described here will enable further exploration of how CD16a drives NK cell ADCC and can also be applied to the study of other important protein receptors for which nanometer localization precision is needed.
Insights
Antibody-dependent cellular cytotoxicity (ADCC) is crucial for immune responses and therapies. MINFLUX nanoscopy visualizes FcγRIIIa distribution in NK cells, advancing ADCC research and therapeutic development.
Area of Science:
- Immunology
- Cell Biology
- Biophysics
Background:
- Antibody-dependent cellular cytotoxicity (ADCC) is a key immune mechanism utilized by natural killer (NK) cells to eliminate infected or cancerous cells.
- ADCC plays a vital role in the efficacy of antibody-based therapies, cellular immunotherapies, and vaccine strategies.
- Current microscopy techniques lack the spatial resolution to precisely analyze the molecular interactions driving ADCC at the single-molecule level within cellular environments.
Purpose of the Study:
- To introduce and validate a novel microscopy model system utilizing MINFLUX nanoscopy for high-resolution imaging of immune cell interactions.
- To investigate the molecular distribution and behavior of human FcγRIIIa (CD16a) within the NK cell immunological synapse during ADCC.
- To establish a framework for studying other critical protein receptors requiring nanometer localization precision.
Main Methods:
- Implementation of MINFLUX nanoscopy, a super-resolution microscopy technique, to achieve precise spatial localization of molecules.
- Development of a model system for observing NK cell interactions and ADCC processes.
- Microscopic analysis of the distribution of FcγRIIIa (CD16a) in the NK cell immunological synapse.
Main Results:
- MINFLUX nanoscopy successfully provided nanometer-level spatial resolution for studying FcγRIIIa distribution in the NK cell immunological synapse.
- The study demonstrated the capability of the developed model system to visualize molecular events critical for ADCC.
- This technique enables detailed examination of FcγRIIIa's role in driving NK cell-mediated cytotoxicity.
Conclusions:
- MINFLUX nanoscopy is a powerful tool for dissecting the molecular mechanisms underlying ADCC at unprecedented resolution.
- The described model system facilitates a deeper understanding of FcγRIIIa function in NK cell-mediated immune responses.
- This approach has broad applicability for studying other cell surface receptors involved in critical biological processes and therapeutic interventions.
