Towards a surrogate system to express human lipid binding TCRs

Area of Science:

• Immunology
• Molecular Biology

Background:

• Natural nut lipids are crucial for food allergy sensitization.
• Natural killer T cells (NKTs) play a key role in food allergic responses.
• Lack of well-characterized lipid-responsive human cell lines hinders research.

Purpose of the Study:

• Engineer human T cell receptor (TCR) sequences responsive to alpha-galactosylceramide (α-GalCer).
• Develop stable human T cell lines for studying lipid-immune interactions.
• Overcome limitations of murine hybridoma systems for human cell line development.

Main Methods:

• Engineered human TCR sequences (TRAV10, TRBV25) responsive to α-GalCer.
• Utilized lentivirus and plasmid systems for stable expression of human TCRs.
• Employed dendritic cell (DC) lines and Jurkat T cell lines as surrogate systems.
• Optimized transfection efficiencies using lentiviral polycistronic constructs with P2A sequence.

Main Results:

• Successfully achieved expression of human TCR α/β sequences in surrogate cell lines.
• Demonstrated functionality of a commercial Jurkat T cell line for transient TCR expression and lipid screening.
• Improved transfection efficiencies in TCR αβ/γδ null cell lines (Jurkat 76) using lentiviral constructs.
• Identified potential issues with endogenous TCR mis-pairing affecting functionality.

Conclusions:

• Developed functional surrogate human T cell systems for lipid-responsive studies.
• These systems are crucial for establishing human cell-specific lipid-responsive libraries.
• Further research is needed to address TCR mis-pairing and optimize lipid receptor functionality.