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Functionalized Lipid Droplets and Microfluidics Approach to Study Immune Cell Polarity In Vitro
Judith Pineau1,2, Léa Pinon1,3,4, Jacques Fattaccioli5,6
1Institut Curie, PSL Research University, INSERM U932, Paris, France.
Insights
Researchers developed a microfluidic chip for synchronized lymphocyte-antigen encounters using functionalized oil-in-water droplets. This method improves upon micro bead assays for studying immune cell responses.
Area of Science:
- Immunology
- Microfluidics
- Biotechnology
Background:
- Lymphocyte polarization studies traditionally use micro beads, which incompletely mimic antigen-presenting cells.
- Existing methods lack precise control over cell-particle interactions.
Purpose of the Study:
- To introduce a novel microfluidic chip for controlled lymphocyte-antigen interactions.
- To enable multiplexed and synchronized encounters between lymphocytes and antigen-presenting objects.
Main Methods:
- Fabrication and functionalization of oil-in-water droplets as antigen-presenting tools.
- Utilizing a microfluidic chip to bring lymphocytes and functionalized droplets together.
- Synchronizing and multiplexing cell-droplet encounters.
Main Results:
- Demonstrated a microfluidic system for precise lymphocyte-droplet interactions.
- Showcased functionalized lipid droplets as versatile, deformable antigen-presenting objects.
- Enabled synchronized and multiplexed analysis of immune cell responses.
Conclusions:
- The developed microfluidic chip and functionalized droplets offer a superior platform for studying lymphocyte polarization.
- This system provides enhanced control and mimicry of natural antigen presentation compared to traditional methods.
- Facilitates advanced research in immunology and immune cell signaling.
Abstract:
The study of lymphocyte polarization upon antigen encounter typically relies on the random pairing between the cells of interest and a stimulating particle (micro bead) that mimics only some of the properties of the antigen-presenting cells. Here, we show how to build and use a microfluidic chip that allows to multiplex and synchronize the encounter between a lymphocyte and an antigen-presenting object: a functionalized oil-in-water droplet. We also explain how to fabricate and functionalize lipid droplets, an antigen-presenting tool that is, at the same time, deformable, fluid, and spherical.
