Functional Flow Cytometry to Predict PD-L1 Conformational Changes.

Area of Science:

• Immunology
• Molecular Biology
• Oncology

Background:

• The programmed cell death protein 1/programmed cell death protein ligand 1 (PD-1/PD-L1) axis is a key target in cancer immunotherapy.
• Conformational changes in PD-L1 can impede antibody binding and therapeutic efficacy in living cells.
• Understanding PD-L1 dynamics is crucial for optimizing immune checkpoint inhibitor therapies.

Purpose of the Study:

• To explore the impact of PD-L1 conformational changes on its function and potential mutations.
• To present detailed flow cytometry protocols for analyzing PD-L1 reactivity in myeloid-derived suppressor cells (MDSCs).
• To provide a methodology for studying protein conformational changes in living cells.

Main Methods:

• Detailed flow cytometry procedures for sample preparation, acquisition, and gating.
• Analysis of PD-L1 reactivity in myeloid-derived suppressor cells (MDSCs).
• Utilizing bioinformatic tools for flow cytometric data analysis.

Main Results:

• Established flow cytometry protocols to assess PD-L1 conformational changes and reactivity in MDSCs.
• Demonstrated the applicability of the method for studying protein conformational dynamics in live cells.
• Provided a framework for analyzing PD-L1 expression and function in the context of lung cancer.

Conclusions:

• Flow cytometry is a viable method for analyzing PD-L1 conformational changes and reactivity in MDSCs.
• This approach can enhance the understanding of PD-L1 function in cancer immunotherapy.
• The presented protocols can be adapted for studying other cell surface proteins and their conformational dynamics.